Part 5.1: What's wrong with my car?!? Advanced Diagnostic Tips from the CAR WIZARD: Tips 1-5

[@jagvette1]

I am a retired Mechanic and love watching your video's (never too old to learn) I purchased your 'special' relays and they save so much time just the other day I was fixing an A/C issue when the clutch would not engage, plug in the 'special' relay flipped the switch the clutch engaged and knew immediately that was no the problem, charged the A/C now everything is fine. Thank You

[@biggerbill82]

I’m glad there’s people like you on KZbin. Thanks for the advice.

[@grayj6268]

i am too. wizard is a rare breed of a youtuber, he is out here to help people. and that is something we will always remember, and he will be known for. He helped so many people figure out complex issues, he helped me have confidence to even work on vehicles. I not only work on vehicles. i took that knowledge and replicated it into small engines. now i repair them even more than vehicles and enjoy that. (far simpler and easier on body to work on small engine)

[@SubwooferGym]

Same. He's become great at presenting to the camera and his information can be fully trusted.

[@ChannelZephyr]

Great tools and advice Wizard! The only thing I would add is that those 2 pin relay testers are not a definitive “oh the relay is bad”. When you flip the switch and the circuit is working, it tells you the power side circuit integrity is good at that moment and that the problem lies in the control side of the circuit (which COULD be the relay, or a broken control wire, or control ground or pcm). It’s not a definitive relay test, but a good guide to where you should look for your problem. If I didn’t feel like testing things I’d rather just swap the relay with a good working one and test the circuit in it’s normal operation to fully isolate it.

[@KissTheFuture]

My thoughts exactly.

[@jorgeroque1995]

"Don't put things in the wrong hole" I can't wait for the follow-up video on Hoovie's SLS. Love your work Wizard!

[@LAactor]

Yeah what was that inside joke? Did hoovie put gas in a diesel?

[@jorgeroque1995]

@@LAactor The Car Wizard mistakenly switched the gearset and dual clutch fluids around in Hoovie's SLS AMG.

[@sirsteele]

As a shade-tree mechanic, I really appreciate the tips and tricks that you share with us... especially on cars that don't have carburetors or breaker point ignition (which I grew up with!). So many "mechanics" nowadays are just "parts changers" who change out suspect parts until they hit upon the problem by chance. You and South Main Auto Repair are not only great diagnosticians, you are also good at explaining to the layman how to find the problem, and how to repair it. Thanks, Wizard... you are appreciated!

[@thumperjdm]

+1. Wizard shows his outstanding integrity by teaching us (for free!) those tricks which could ultimately keep customers out of his shop, so he's actually potentially losing money through these videos.

[@I_Died_2_Weeks_Ago]

@@thumperjdm The reason behind book burnings... Hint: download the videos before they're deleted!

[@Duraputer]

I love the baby yoda shirt. Baby yoda while working on a baby yota

[@dream431ca]

"We're back at grandma, and yes she's still for sale" Best Quote of 2020.

[@thatmanina240brick4]

wear I live its like 5 or 6 grand for a Markie thetas not rotted out 3000 holy! SH%$$T!

[@hacatan24]

Tyler reminds me of that movie national Lampoon's vacation when they put the grandma on top of the car lol 😂

[@godgirlsguitars]

And the line he said after that. "The power probe." and something about the blower motor.

[@estlhm805]

🤣😂🤣

[@jjmarz1001]

We need a Wizard 'Don't put things in the wrong hole' T-shirt.

[@CarDocBabaPhilipo]

🤣

[@Medenis777]

That's what she said.

[@JJ-iw7nh]

Too soon

[@Shorty15c4007]

"My tranny shifts funny...."

[@bngr_bngr]

Medenis777 ooops.

[@johnulrich5572]

I need a Car Wizard near me. A mechanic you can trust - what everybody needs. Keep up the good work, Wizard.

[@blairbler2915]

In the old days at the motorcycle shop, the lowest guy on the totem pole would have to hold the shaft of a screwdriver stuck the spark plug wire. The mechanic would kickstart it and if the guy dropped the screwdriver, you had spark.

[@SerbanCMusca-ut8ny]

This is the best comment out here. How the hell is it not the top comment? xD

[@philipcbarrera1537]

Wizard that power probe is a great tool. It can also blow a circuit if it triggers the wrong circuit if it is used wrong.

[@jlw1985]

Had a newish tech blow out a entire bulkhead harness on a Subaru by using a power probe to test a speaker,

[@dafff08]

funny how the only problem of the toyota was man made because of poor maintenance.

[@popoveli]

Learned some good stuff that will save me money on my truck repairs

[@tomfurie2996]

Jaguars from 2004-2009 are notorious for faulty grounds due to the copper wires grounded (earthed) to the aluminum body with aluminum ground studs. Especially the four behind the headlights which are somewhat exposed to the elements. The trunk ones less so, but still should be cleaned. Also, all the studs are very delicate and will break if over tightened. That’s your Jag Tip of The Day.

[@yohojones]

You should put chapters and links to each tip in the description. Any time someone looks for that issue you'll get a hit and possibly a fan. Love you Wizard.

[@idigitalclic857]

You're a Great Automotive Repair Instructor. You're instructions are straight forward and easy to follow. A OBD-II Code Reader is a Must Have Tool, Your Load Test Light bulb, Multimeter, optional extra Tester the Power Probe 3 or newer model makes for quick Ground Diagnostic Trouble Shooting. Plastic Pliers & Silcone Test Leads is also Must Have Tools.

[@freestratproject7065]

Gold. I tell ya this is GOLD!!! Every car I buy I clean all body grounds first. Bad grounds throw weird "other" electrical issues. (Eliminate the negatives!) 20 year old vehicles: Porsche and Mercedes OWNER and daily drivers.

[@red95gts]

Great advice! I know it was intended to be generic advice, but that generation of OBD-I Ford (EEC-IV) will perform an automated cylinder balance test where it raises the idle up to about 1500rpm, then drops out one injector at a time and looks for corresponding rpm drop. It’s a quick, easy way to see if all 8 injectors are contributing equally

[@hotpuppy1]

One more tip for finding a bad coil for cars with individual coils: swap the suspect coil with one on another cylinder and see if the code moves with it. Also never assume your new part is going to be good or last very long. Had a new plug wire go bad after only a week or two in an 88 S10. Tripped a code and ran really bad. Thought it was something expensive and at the time I didn't have computer experience. Dealership missed it and tried to sell a bunch of unneeded stuff. I bought a couple of the things (rebuilt computer and throttle body gasket). Didn't need either. Went back to basics with the VOM and found the bad wire that the dealer's scope should have caught.

[@roymedina9310]

Ok Mr. Wizard thank you so much for making my hobby more enjoyable! I bow to you sir. yeah i am buy the plastic pliers right now.

[@Seegalgalguntijak]

I would have not used the plastic pliers and test lead to potentially fry the coil like that, I would have just cleared the code, and switched coils #1 and #2 and then seen whether the fault code now comes up on cylinder 2 or whether it stays on cylinder 1. Yes, that means removing more fasteners (1 more lose than with the Wizard's method, and 2 more tight, although most of them don't necessarily need to be tightened for just a short test) and unplug and plug in 2 electrical connections. So it's about 1 minute more work, but you save on buying tools ;)

[@lmantuano6986]

yes, me too, he had one suspect faulty component and three known good ones, why not swap #1 coilpak with #2, #3 or #4 and watch the fault follow #1 (or not) on the OBD reader...

[@jesdadotcom]

I could watch this channel all day. I appreciate any KZbinr who doesnt yell at the camera.

[@utuber2940]

Scotty kilmer is incredulous right now about your Toyota diagnosis!!

[@moeanthony9308]

Is Scotty still around?

[@Hotlog69]

@@moeanthony9308 Yes.

[@moeanthony9308]

@@Hotlog69 Lol

[@colinklang]

Unfortunately

[@mikeakaspike]

Oh Scotty.... "Today on Scotty's channel, should you buy it? No. Everything is junk and can't be trusted!"

[@gulfstream7235]

Jesus those rims on the 360 are a thing of beauty...

[@AdamG1983]

Just came here to give you a shout out. So many people would have screwed things up by not owning that mistake with Hoovie's car. You didn't. You owned that shit and made it right. You have my respect

[@Hurlburton]

I can not help but like this guy He is a great automotive instructor

[@letzrockitrite8469]

Super happy to have been shown your channel.... as far as explaining goes..... I don't think you can be beat !

[@ajw828]

Great video! Love these! Definitely have taken the "validate the problem" tip to heart before trying to fix something, and these tips definitely help prove what has actually failed.

[@codyhickman7335]

I have to say, I appreciate watching the proper way to troubleshoot. I'm a capable backyard mechanic, have always owned older vehicles mostly with issues of some sort and can usually get it taken care of. But these tips are very helpful.

[@travwayfar]

I could literally binge watch these series

[@RobbieHerrera]

This is definitely one of the top most useful videos on KZbin.

[@TheRebuilt1]

Just these tools and more importantly the technician that understands how to use them and foundational knowledge of vehicle componentry. Great sharing of knowledge sir.

[@nizzy1057]

your channel has come so far. super happy your are making videos!

[@joespittle1]

Don't know if this was already mentioned but consulting a forum or two dedicated to your make and model can be incredibly helpful

[@codyjacobsen6954]

As a new mechanic apprentice I appreciate these videos. Thank you wizard.

[@curlymyhero]

I've owed a few Mercedes and I've always gone thru them electonically. But here the Wizard taught me alot!

[@12tallod]

That Bonus tip gave me a big chuckle, thanks for that gift as well as your insights into mechanical items.

[@christopherkraft1327]

You are a good man Wizard, it's awesome that you give these little workshops full of helpful tips!!! I hope that you find a good home for Grandma. 👍 I love the bonus tip!! 😁

[@rjlopezmr.p2216]

The “bonus” tip was my favorite of them all. Bonus points for that epic yoda shirt. 👍

[@jamesjames3525]

Thank you Mr. Wizard, thank you for not taking yourself too seriously, as life always has a way out of a BAD bind.😉😉😉👍

[@richardmeador4023]

Wizard couldn't you switch the coil to another bank and see if the problem moves That would also tell you that the coil is bad and you could have the same fix

[@opelmantamechanic8438]

Absolutely right👍

[@dustintunis9347]

Plus if that works you KNOW everything else in that circuit is good. Edit : I read coil and thought relay. When I read 300DBenz's comment I reread Richards and realized my brain fart.

[@300DBenz]

On those Toyota inlines, it takes less time to swap 2 coils than it does to walk over to the tool box, dig through the Diagnostic drawer (aka, the rats nest of test cables), find what you need, walk back and set everything up

[@tomh5663]

Technically you shouldn’t swap the coils what about if there is a short in the wire you swap the coil and end up burning another coil

[@gillgetter3004]

That’s what I’ve done.

[@sakaraist]

This series is wonderful and I would love to see some more similar videos.

[@alexanderkrasnov2833]

Don't put things in the wrong hole! One of the best tips from Car Wizard!

[@imranyaqub1790]

Enjoyed the tips. Thanks for doing them. Nice addition to your channel 👍🏼

[@glassvial]

That last one is a pro tip for life!

[@1337penguinman]

As far as coils go, with a single cylinder misfire I usually use the old swap the coil and see if the misfire jumps trick. Usually won't break out the spark tester unless I'm dealing with actual plug wires. Another thing is if you're not 100% what a reading is supposed to be, or what a good injector sounds like, check them all. Chances are if you've got an odd one out, that's your problem.

[@ronrandall7118]

Car Wizard, this is one of your best videos for the DIYer. I will be buying the relay switch from your Amazon link. I have to watch this video again and make notes for electrical issues. A lot of DIY mechanics are weak when it comes to diagnosing electrical issues. You just may it much easier. Thank You & Merry 2020 Christmas to You & Your Family and Happy 2021 New Year.

[@emersontucker9237]

Thanks Merlin 🤯! Your insight and experience helps me on my budget car path. I do my own repairs too...

[@arvbergstedt3303]

Ground’s definitely can be intermittent gremlin problems. Years ago I worked on a boat trailer that had brake lights slighty glowing through tail lights sometimes. Nothing worked right. Several mechanics had tried to fix it. Took awhile but finally found ground problem-2 piece trailer hitch on boat trailer with master cylinder for braking as weight pushed against pickup when braking. Poor ground which changed weak and stronger depending on hitch movement. Added good flexible ground wire between the 2 piece hitch and WOW. Everything worked fine.

[@rusnsc7622]

Thanks to the “Wizard’s” for another great video with useful info for us DIYers. Look forward to the next. Be well.

[@newdayyesterday]

Some excellent tips. Very much a case of a common sense approach to problem solving. Certainly helps if you know what to do, see videos by Car Wizard, and have the basic tools for completing the checks to hand.

[@joecool509]

those relays with the switch can make a great theft deterrent

[@faithwalker7]

Love ❤️ the older cars you have in your shop.

[@coastalcop]

OK you are like the Bob Ross of the mechanical world, soothing voice, happy little wiring, kudos and keep it up ;)

[@senanfoutchedjev2401]

Great, Great video Wizard, many, many problems occurs of faulty connections/bad grounds. Excellent video. Thanks.

[@jordanrudler2120]

Another quick tip if you work on french cars, cylinder#1 is on the flywheel side. Make sure you diagnose the right one

[@superdupergrover9857]

Wizard is not exaggerating in the slightest about the symptoms of a bad ground. If it is a super weird (especially inconsistent) electrical problem, your first thought should be a bad ground. While it's not always a bad ground, that is often easier to check and fix than other possibilities. Also, Wizard's setup for a load tester is a great idea. Unless you happen to have junk car parts handy, I would make one out of a "generic" (ie old US pickup) light bulb socket off the shelf of the parts store. These already have leads on them. It should have a part number for a bulb on the package, get that lightbulb too. Small bulbs, tip of little finger size, will draw 1 amp or less. Larger, end of thumb size, will be 1.5 -3 amps. Headlights will almost always be 5 amps. Don't use LED bulbs, they hardly use any current at all. Same with a test light, its not LED but it is very small. The newb workers at a parts store might not understand, if so, ask for a manager or "someone more experienced". As long as you try not to sound like a snob, they won't mind.

[@benjamineastman9429]

Q: What do I do now? A: Throw parts at it and hope it goes away!

[@estlhm805]

This guy is a wizard! Great information!

[@TAKIZAWAYAMASHITA]

last tip is actually the greatest about the wrong hole, sure nothing bad happened to the car. but in everyone else's case its just a lesson to double triple check something before you do it, so you wont damage something insanely expensive or hard to fix, like if you are replacing a water pump etc check to be sure you are doing it wright before you do it

[@yankeedoodle6293]

What a likable fella

[@janicesmyth2183]

Thank you Mr Wizard! My grandson was able to remove a bolt from underneath the car he was working on. It was my suggestion but your advice! Thank you for your videos! I got the credit for removing the stuck bolt lol

[@jordanrice498]

Going through all these videos picking up 💎s, appreciate it man!! 🙏🏿

[@AlessandroGenTLe]

I wouldn't have changed that Toyota coil... At most I'd have said to the customer "it may happen that the coil will need a replacement soon, if so call me and we'll do the job in 10 mins here". Testing the injectors: on modern cars you can command them from the OBD. Or you do a simple circuit with 12V battery and a button: when you push the button you close the circuit on the injector and you should hear it to click. I used that way( (in conjunction to a ultrasonic cleaner and some injector cleaner) to clean my motorcycle injectors after I disassembled them from the intake. For ground check, a light pen 3W normally is enough. Another absolutely necessary tool nowadays is a portable oscilloscope. Without that you can't check CAN/LIN buses or any other electronic sensor. I got one for 130$ and it's great. About the wrong holes... We are in modern time, each his own... Oh, you were speaking of mechanical stuff... OK :D By the way, another GREAT diagnostic guy is this from Netherlands (he does video in En). kzbin.info/door/R73yN7vT7-P541g2qlfRrgvideos

[@legambaz]

Useful, practical, brilliant! More tips please

[@tjyork1983ia1]

I have the same shirt! Such a stylish wizard.

[@gsmith207]

I always notice his T’s too! Funny stuff. Mrs Wiz must help! Ha

[@asherv.4332]

Quick tip for wizard tip number 3, you could technically use a multi-meter and a power resistor if you didn't want to make a light contraption like the wizard has. You would set your multi-meter to amps (change the connections accordingly) and connect your power resistor in series with the multi-meter. Then you would jiggle the ground bolt and look for changes in current draw. Same principle applies, but since a power resistor doesn't light up, you have too look for changes in the current draw (thus the multi-meter). Power resistor ratings are in Watts. Using ohms law (google if you want to know the math) you would find that you would need a power resistor of wattage equal to Watts = 144/Ohms, so something like an 8 ohm 100 watt power resistor would work if you wanted to perform a test like the wizard.

[@douchenozzlemcgee6111]

People like visual "yes" and "no"s lol Nice job explaining though!

[@parallax5413]

It would be nice if the test relay plug had an LED on the control line to indicate activation line state as well.

[@eldnahym]

Thanks for helping this crude mechanic!

[@Mike_44]

What a great channel! Honesty is the best policy, specially from a good mechanic. You got a new subscriber.

[@pl7868]

Great tips :) i made your light bulb tester thingy from an old voltmeter a few yrs ago but learned something new in using it to test grounds Thx for that, i made it to check power easily because was just sitting there going in garbage most likely an it had the leads to probe with so soldered a bulb in an instant tester cost nothing, now i'm going to add a switch to be able to add power to test things to omg your so smart :) humm might need two switchs and two more leads to be able to give something ground and power at the same time humm, o well tinkering is always fun !

[@ViralTrys]

6:50 LOL "oH It mIGht bE A FuEL inJeCtoR..."

[@ToomasTelling]

The last bounus tip was the best!

[@TailEndCustoms]

Great tools. Last tool is awesome. Talk about cutting time down for diagnosing

[@thureinphyo9768]

Thanks man. I love ur generosity at giving out knowledges. U’re not like other mechanics. Wish u’re here in Bay Area. Kansas is like so far.

[@bbkmm1]

That Power Probe is on top of the list with scanner, test light, DVOM, and oscilloscope as must have for diagnostics. I didn't really think much of it till I got one. They are as low as $50 if you forego some fancy features like injector testing.

[@seanguy9720]

A 2005 Rav4 is unusual in your shop, compared to what you usually work on lol

[@PhyuckYew]

The mechanic that works on my BMW only works on German cars but he'll also take in my Toyota. Maybe the person that owns that Rav4 also own an exotic car.

[@Alex.AL_26]

@@PhyuckYew the rav4 is his daughters car

[@PhyuckYew]

@@Alex.AL_26 So I was half right then.

[@TheOzthewiz]

Why? It's a TOYOTA!

[@Ventargard]

Out of context Wizard: "grandma is for sale"

[@triumphtr779]

I never knew those rocker switch relays existed. Thanks, Wizard

[@alanzolotoff6014]

Hey Wizard 🧙‍♀️ When will your boat repair shop be opening up ?? I will be your first customer 👍👍👍

[@binnydinney9739]

Alan Zolotoff All boat owner know BOAT means Bring Out A Thousand. He’d probably make a Lotta money off of that.

[@stephenbritton9297]

Funny relay story... My fire department had a ladder truck that the headlights would randomly shut off. One night when it happened, the officer, sitting in the front passenger seat, stomped his feet and said some non-YT friendly words, and... the headlights came back on! Magic? nope... relays were under the officer's position floorboards and the headlight relay was loose!

[@md2k8]

The 2005 Toyota RAV4 looks too small for my taste, but I am looking forward for the second half on tips six through ten for diagnostic maintenance. Also, please note that the Toyota 2AZ-FE engine, which is the 2.4 L four-cylinder engine from 2002 to 2009 is known for oil sludge, if you do not replace the engine oil on schedule. This engine goes on most Toyota models. Thank you very much.

[@Flies2FLL]

Mercury marine sells something similar to the Autell for their outboard boat engines. I have the Mercury Vessel View attached to the 90 squirrel-power outboard on my 17 foot Bayliner. It has a module that ties into the fuel injection OBD plug and sends a BlueTooth signal to an app on my phone showing the water temp, voltage, gallons per hour, gallons remaining in the tank [based upon usage and you updating the app when you put gas in], oil pressure, and hours. If there is a code that suddenly appears a message comes up on the screen and tells you what is wrong. Since this is a MERCURY engine this system is a good thing to have. Don't even get me started.....

[@RD-km4yi]

With wire leads and a DVM, there is no need for a voltage probe or special relay test switches. 12v and ground can be measured (meter) or applied (battery) anywhere.

[@CarWizard]

Nowhere near as fast though. Time is money in a shop

[@ianwynneuk]

Very humbling Wizard, good on you mate 👍

[@billbaxter3800]

This guy is not only an amazing mechanic but an amazing teacher. I suspect he could've been a brain surgeon had he wanted to. So glad he decided to help people on KZbin! What a fantastic resource. And very entertaining - Hoovie reminds me of Jeff Goldblum - hilarious. THANKS WIZARD! If I lived closer id buy grammaw!

[@gsmith207]

Thumbs up before I even watched. Peeps pay for this info in school. Thanks Wiz! Free for me!

[@afitzsimons]

Goo reminder, even the experts can make a mistake, always think twice. I just snapped a brake calliper pin as I was sure it was stuck and I was turning it the right way and added more leverage. Doh!

[@chadfield376]

Love these general diagnostic episodes you do. Great tips as always; keep these and the multiple question “which issue does this vehicle have” type videos coming. The trickier the more interesting.

[@CouchMan88]

My autoshop teacher had us stick our fingers in the plug wires for lawn mowers while someone pulled the cord to show us how coils work and test them. First year autoshop assignment was to rebuild a lawn mower engine and get it to run.

[@C_Research]

I would argue to replace all 4 coils. But your customers are paying much more than my derelict self looking at delco coil packs on rock auto

[@blackericdenice]

Swap the fan relay with the a/c compressor relay. If the fan start to work. You have found the problem.

[@billgorman481]

Aww, selling the mighty Mercury! Love this gen.

[@MasterMalrubius]

So much smoother and easy to listen to than Hooptie Boy.

[@miketeeveedub5779]

CHECK YOUR RELAYS! I had an intermittent starter grinding issue on my Ford Five Hundred with the 3.0L V-6. Cleaned the power leads on the starter and battery and measured the resistance on the starter cabling - no voltage drops. Bought a new starter, thinking the old starter solenoid was bad. It was worse then the old starter(?!!!). Bought an actual Ford Starter from the dealer. STILL same issue! Played with shimming the new starter - no help! I was at my wit's end! Then one day I read a Taurus forum about faulty ignition switches and relays. I bought the starter relay and ignition switch ($7 & $25 off Rockauto) and installed it - it has not ground since! I spend almost $300 unnecessarily when it was a $30 fix. Do your research and follow the proper diagnosis.

[@ryanrosser7916]

In general you check the cheapest, simplest things first. 99% of the time mystery querks are caused by something so simple you feel like an idiot when you figure it out

[@dave_n8pu]

Back in 1980ish I bought a old pickup truck mainly because it had a snow plow on it. I knew the guy and his family. They were the back yard mechanic types, he told me some of it's history since he had it. Several engine swaps .We ended up taking it on vacation. Yes we made it there and back with minimum problems. The only 'problem' was when we would plug in our VHS camera, it was a 12V one, once in a while it would just turn off while plugged in and recording. After we got back home I got curious as to why that camera would just turn itself off, the other thing I noticed was when I took my Volt/ohm meter and checked the voltage. At the battery it checked about 12.5 - 13V resting, at the cigarette lighter it was 12V, again resting, at the trailer hitch light plug maybe 9ish volts. Now the question was why, later I was talking with some guys at work and one of them suggested maybe a bad or dirty ground. Next day I went looking for engine grounds to the chassis... I don't see any, so to test a theory, I grabbed a set of jumper cables and found good ground on the engine and made a good ground on the chassis, as soon as I touched the chassis I saw a spark. I made a good connection and proceeded to check the voltages again. I bet you'd never believe it, I had about 12.5 - 13V voltage all the way to the back of the truck. Why so involved of a story, the problem may elude you because you can't see the 'elephant in the room' until you get some outside input to change your direction of thinking.

[@garfixit]

Thank you wizard. I love the tools and great tips👍👍👍👍👍👍👍

[@lesliedsouza4077]

CW, You Are - CW :) 35,707 views, 374K subs, 342 comments - mostly thoughtful :) Ms W interjects the right question at the right time - Keep you honest :) The bad earth thing could have application with cruise control? Involving Brake light circuit for auto cut-off? Your bonus tip was quite apt, after the voltage application tip :)

[@mrmoto2443]

Thanks wizard for another useful learning video !

[@michaelharris1895]

you find the problems with tools, but only if you have the knowledge of how and when to use them. you`re not mentioning the years it takes to amass that knowledge. kudos for the tips.

[@unclepuddle]

Don’t forget to not let the spark hit any fuel rails. Also, you can hit the silence button on the side of the power probe to shut it up