Rough Running? Bad Mileage? How to Diagnose Car & Truck Fuel Injectors!

Shop for New Auto Parts at 1AAuto.com 1aau.to/c/108/j/fuel-injectors
Learn how to diagnose fuel injectors in this video! Rough running, hard starts, poor mileage: all can be signs of a failed, or clogged fuel injector. These precision instruments need to be in top shape for your vehicle to run right. If you are having problems, and air and spark systems are in good shape, check out your fuel injectors!
Having other tricky issues with your vehicle? Check out our "Tips and Secrets Only Mechanics Know" playlist! • Tips & Secrets only Me...
For More Info visit us at 1aau.to/h/b8x/
⚠ DISCLAIMER:
While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

[@1AAuto]

√ *Watch the Video* √ *Buy The Part at 1A Auto* 1aau.to/m/Visit-1AAuto √ *Do it Yourself* √ *Save Money*

[@justinreynaud1598]

would this cause a 3-5 second period of “bucking” or “shuttering” when inital acceleration? my 2012 f150 is doing this. already replaced spark plugs

[@damasovega8094]

I have a 2008 Chevy Silverado with 5.3 engine have a misfire on #4 & #7 full injectors I replaced both injectors still misfire and through gas to the exhaust pipe ? Can you help me to know what else I can do. Thank you and my name is Damaso.

[@FleetTech97]

I think this guy is my favourite. He’s always smiling and soft spoken.

[@1AAuto]

+Danish Roy Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@saby7416]

best video I've come across for complete diagnostic guide on injectors 👍🏻👍🏻

[@makaveli2tt]

I love the presentations on this channel. I learn a lot

[@automedicine]

By far the best channel on Auto education..

[@wildthoughts6959]

WOW, this video deserves A++ grade, especially associated with a smile :) Thanks man. Well explained . Most videos I saw on injectors are vague .

[@Engineerboy100]

Great job on the video, nice and short, clean and to the point. Thank you

[@bigjun913]

best video on diagnosing fuel injectors, you guys are Pros....

[@Artsalloverone]

Great description video to diagnose fuel injectors.

[@garffieldrobinson8700]

U are a real teacher and you good just keep it up

[@ladydjones9337]

Love how you break it down 🤜🤛😉☺

[@jediwookie9240]

First time watcher here, have watched many though. New subscriber though. I like your time taken to explain and visualize as well as multiple options for diagnosis. Very simple, modest, and thorough. Thank you

[@1AAuto]

+Jedi Wookie Welcome and thanks for the feedback!

[@r-luvbham6608]

@@1AAuto does seafoam work for cleaning injectors

[@YH7R]

awesome content very professional

[@markslusz5590]

GREAT job. Thank you.

[@withgrowinginsanity198]

Lots of good nuggets of information. Thanks

[@1AAuto]

+With growing insanity Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@rocco215840]

Very well explained… sir … I AM A FAN

[@robertkeenbuildingmylifesh3429]

OOOOOOOOO so much motivation man.

[@1AAuto]

+Robert Keen Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1AAuto.com

[@konstantinusstoyanov9749]

Wonderful teacher, video, mix of old and new school

[@1AAuto]

+konstantinus Stoyanov Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1AAuto.com

[@cace1968]

Great vídeo thank.

[@1AAuto]

Anytime Cesar! Thank you for tuning in.

[@randyowens2717]

Thanks!

[@1AAuto]

+Randy Owens Thanks for checking us out!

[@freeyourmind8849]

gold bro. have a GM car that runs and stalls. we put new pump, filter, regulator, even ultrasonic clean the injectors and once a load is place aka A/C on it dies.

[@mrstoner2udude799]

Vacuum leak or injector? Slight idle cycling. Thanks for the video.

[@salmanabdulrahman815]

Thanks tooo much you are the best man

[@1AAuto]

+Salman Abdulrahman Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@RexerYTRexer]

Can I just let all 6 of my injectors spray into 6 small cups and measure the amount of fuel in each if its even they are likely ok if one is dry or less then i know its clogged/bad?

[@hermanrogers1325]

I am getting ready to buy all new injectors for my mustang GT 04

[@chowaski]

im driving an inline 4 Nissan, petrol, it's 14 years old. problem of mine is, my car cranks fine, my fuel pump is good. plugs changed air filter is good. no vacuum leak(s) at times esp after parking for more than 12 hrs, my car would crank fine and start. in about a few seconds it would idle rough. rough i mean real rough. the engine is literally shaking. rpm bouncing between 500rpm - 1100rpm when i step on the gas pedal either in Neutral or to drive off, it would shudder the car, it sputters sound liken a boxer engine. really sluggish acceleration only up to 3k rpm it smoothens out. at times it would start fine, idle fine, after moving my car from the parking lot and driving it for less than 5 mins and shutting the engine off, once i restart the engine it would sputter again. exhaust fumes are of awful smell. to remedy the problem for the mean time to get the car going, i have to rev it up in Neutral to about 2k-2.5k rpm for a few seconds, it then smoothens out and it drive fine. as if there was never a problem in the first place. no CEL. once i had CEL lighted up. drove it at a constant rpm of about 2-2.5k it smoothens out and CEL is gone. got a code before P0350. my question is, is anyone experiencing the same issue regardless of any petrol car you drive.

[@joshuadugan1931]

Added to my favorites 😎

[@1AAuto]

+Joshua Dugan Thanks for checking us out! 1AAuto.com

[@joshuadugan1931]

Do you guys do tutorials on pre OBD2 vehicles? I'm just wondering, because I like like working on older vehicles, and also I try to do 90% of my own vehicle maintenance. Right now my daily driver is a 92 Mustang LX. I've owned new and older vehicles and really like learning tricks that you wouldn't normally learn. "Trick of the trade" so to speak

[@karlhungus545]

How do you diagnose the partially plugged injector though? Rough idle? How would you narrow it down without having to just replace every injector?

[@jamesgadd931]

Thank you my fuel filter came apart I'm thankin there part stoped up from old or stuff from the gas

[@Frostensen]

Question, do you change only one when broken or all four (because of that single one) on older cars?

[@eliaskauffmann4773]

"with the engine running place the stethoscope" uhhh my straight pipe would blow my ears out😂😭

[@elnikee]

Hi! i have an old toyota corolla 2006 diesel 2.0TDI. I tested the resistance between the injectors, every injector has 2 sets of 2 pins, one on the top and one on the bottom. All injectors have the same resistance on the bottom pair of pins. But the ones on the top differ, the injector number 1 and 3 have 1.24kohms and nr 2 and 4 240ohms. Any idea if those values tell something? i checked the manual, the bottom ones are in range. The two pins of the top of injector 1 and 3 are not, the range for the top is 30-9530ohms. Isnt it weird that they have the same exact value? Thanks for any advice. Great video!

[@TwitchRadio]

Ty😎👍

[@1AAuto]

+TwitchRadio Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@phantoms_purge]

Would this cause a throttle light because I replaced throttle body already and I still have throttle light

[@MM3OG]

Question can bad fuel injectors throw a p1101 code for the maf???

[@dannyhyland9748]

If I cross the wires that go into the injectors (#5 to #7 / #7 to #5), will I get a P0300 code? 2013 Chevy Silverado 5.3

[@Propolizei]

Hello, can you tell me if I replace all bad diesel injectors with new, in my engine (Ford Focus 1.6 tdci), will it already improve obvious weak power I feel every day, or does't- perhaps if turbine pump is also demaged (during driving with bad injectors maybe). Does setting new injectors with old pump is good solution with no worries in future? Thanks

[@1Down5UpOfficial]

With the proper scan tool, could you see what happens to the car even if a check engine light doesn't come on? or is that false. I'm having so much trouble with my car and with no codes it's literally impossible to pinpoint

[@akshaygaming1869]

Changed my fuel filter now im having jerking while driving and lack of power. Maruti astar 2010 Could it be due to air in fuel rail?

[@matthewquinn7991]

Is there a video somewhere for absolute beginners? I have no clue what all the acronyms mean or how to find these parts you're talking about. I cant even find the ejectors in my engine!

[@jamesgadd931]

In all my injectors rough idle changed everything but the injectors

[@patrickharding4831]

I bought 4 new injectors for my car, one of them has a tiny faint rattle when I hold it to my ear and shake it, has its valve spring failed? The other 3 dont make a sound when I shake them next to my ear. 🤷

[@matthewpetersen4417]

When the injector leaks, and no codes throw but high rear o2 mv and youve replaced the cats, spark plugs, O2 sensors etc. This is only on bank 2 So as per me brainstorming today, I am looking at blaming a leaking injector or two possible.

[@irneskajtezovic2357]

hy can a link to injector tester?thnx

[@bigcartoonyIIV]

how to test the spider injectors?

[@waraysangkaymechanic2054]

what if the fuel injector has too much spray on the nozzle. looks like straight or not spreading. what is the possible problem?

[@skate04ever1]

I hope anyone can answer my question. What's the logic behind clogged fuel injectors decreasing fuel economy? Shouldn't it save fuel instead, since less fuel is being injected to the engine because of the clog?

[@lik3OMJ]

Working other cylinders much harder

[@dianna3879]

The engine is no longer running at its efficient state that got it its good fuel mileage. When its out of wack its not going to get good fuel mileage

[@dubblyewjay1133]

I say it recalibrates the PCM out of whack= less mileage.

[@alenyegiyants9254]

I have 2011 toyota tundra 5.7 yesterday was running fine this morning try to go work it wont start it turns it trying to turn and dies right away. Scanned it nothing coming up. Help please

[@srs6946]

Hello does new injector can save you gas??

[@rodrigomillan8483]

Thanks for the school Man, I have a injector that the resistance is only .02 ohm of , I am confused, do I change it, it is out of limits barely, bike is running rich.

[@Brandon-uy1uv]

My car injectors read 12ohms

[@KRALTAIR47]

What if, when I press the gas pedal and the vehicle takes awhile to actually start going

[@CaptiveHat]

My 2 problems. I have a 2005 4.0L 4WD toyota tacoma. okay. Radio wont turn on. when the raido wont turn on, the Cab lights, Passenger airbag, and my remote also will not work/turn on. IF i have the truck on for about an hour straight, or if its cold outside. these things will work. im also getting codes P0031 and P0051 H02s Heater control circuit low i bought the vehicle in early 2018 and after 6 months or so the check engine light came on. i replaced both O2 upstream sensors. and the check engine light turned off for about a month. then it came back on and hasnt gone away. so i replaced them again and it didnt go off at all. still the same codes are showing. So im going to replace the downstream sensors as well. just to see. i also changed two fuses and it turned off for 5 hours and came back on. at this point i dont know what is going on. i get about 2 mpg less than i should have.

[@1AAuto]

+WithJimbo Thanks for checking us out! Since there could be multiple reasons why you are experiencing this issue, we do recommend have a nearby reputable mechanic diagnose the vehicle.

[@emuonwheels1990]

Does anyone know what’s the big orange tool he use first that was blinking when he made contact with the injector?

[@yungdolphin9130]

Multimeter

[@Dannny-Lee]

The orange diagnostic tool used in the demonstration is commonly known as a electronic fuel injector probe.

[@sameeraparkar8289]

Is injector cleaner added in gas make any difference ? or always need to remove

[@martinez1701a]

Sometimes it might make a difference but usually if the injector is old and worn it won't.

[@cesaraguilar9096]

My exhaust smells like gas and I know for a fact one cylinder is not working on my 91 Cadillac. I'm about to gamble it and order 8 fuel injectors this week

[@zionautomobile208]

Pls kindly help me to solve my 2011chvy equinox,it is giving me misfiring,I have changed the spark plugs/ ignition coils/ head gasket/ vvt sensor/but still misfiring

[@Chespi593]

Probly can be ecm engine control module

[@kicknsystm]

I have a Nissan X-Terra 3.3 v6 sneaking up on 200k miles. I've changed everything but the injectors & MAF sensor. Gas mileage is down about 3 per. gal. & the idle isn't perfect. It runs great, maybe I'm too picky. Should the injectors be changed as part of maintenance at this stage? BTW, It's a 2000 I inherited almost 5yrs. ago & now looks & runs almost new. Just dealing with the details.

[@dominicdevito4200]

Hey bud I have an 03 as well. Try some maf cleaner before replacing it. I did it on mine and helped a lot. If your not running stock size tires your gonna lose mpg and also check your air filter before your intake. Mine was nasty as hell, switched it out and gained another 1 mpg.

[@mohamedelmasry4452]

Injector could be clog by the fuel additives unfortunately

[@jehehdjdjdjdjdj9772]

can a injector work but not work enough to be efficient ..

[@rehmansohail1734]

Hi there i have a 2011 nissan qashqai 1.5 dci it has a very loud ticking and a rough start with vibration but no smoke does my car need new injectors

[@1AAuto]

+Rehman Sohail We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@johnsmith6368]

@@1AAuto the reason most of the people are watching your videos so we don't take our vehicles to mechanics.

[@alberto_el_tiburon9127]

When I step the gas on my truck it feels like it’s lacking power it won’t movie as fast as I’m pressing on the gas feels uneven, and sometimes when is not accelerating (lacking power to keep move faster) at random times, it feels like I went over a little bump and then accelerates faster what could it be ?

[@MARTINGARCIA12]

I’m having the same issues....did you find out anything?

[@albertquintero5412]

How bout hard shift 1-2 gears?

[@ddewaukee3105]

What if it's ticking really loud?

[@1AAuto]

+D Dewaukee We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@ddewaukee3105]

@@1AAuto the reason most of the people are watching your videos so we don't take our vehicles to mechanics.

[@ip7114]

Hi, so broken O-ring can cause car not to start?

[@1AAuto]

+I P We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@dannypalmer7701]

Engine not running cannot test it

[@bthompson1767]

What if you have a rough running engine with no codes

[@1AAuto]

+B K We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@johnsmith6368]

@@1AAuto the reason most of the people are watching your videos so we don't take our vehicles to mechanics.

[@1AAuto]

+john smith we appreciate you checking us out and hope our videos have helped you with your repairs! If we could diagnose the problem for you, we'd be happy to.

[@johnsmith6368]

the reason most of the people are watching your videos so we don't take our vehicles to mechanics.

[@1AAuto]

+john smith Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c

[@austinjoppa9142]

I wonder if he lives in Colorado

[@Nelval573]

I got black smoke shaking engine p0452 looked up im lost

[@1AAuto]

+Nelson Valdez We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@johnsmith6368]

@@1AAuto the reason most of the people are watching your videos so we don't take our vehicles to mechanics.

[@olenaerhardt7725]

@@1AAuto Most of our local mechanics are not good anymore.

[@yungdolphin9130]

Or throw in a 2.99$ bottle of injector cleaner from oreily's

[@timothybowman569]

Only Ford make problem fuel system . Worst design in history . Had I know 22 years ago I would have never got this car . It’s caused me problems for sure . God help any one with this junk system.