Replacing Knock Sensors 1994 C4 Corvette

[@Amundred]

Update #2: I followed the DTC troubleshooting tree (will have videos and stuff later) and it may be the pigtail on the Ignition Control Module that is bad...or the control module itself! Ordering replacements now and will finish up the video with an update after install!

[@geneyus6411]

Awesome!

[@geneyus6411]

LET ME KNOW about the wires again, thanks👍

[@bevy9598]

Thank you so much for this video I could not figure out out the connecter comes off the knock sensor. You saved me alot of time and frustration.

[@Amundred]

Glad that I was able to provide some help! Thank you for watching!!!

[@quintenbarker6620]

Have you tried a new throttle position sensor? Have you checked your fuel pressure since you changed the fuel pressure regulator?

[@Amundred]

Haha...all of the above and more! 😂

[@jeepguymb45]

Thanks for sharing. I was able to replace a ground wire as I watch your cat removal video. Mine is a 93 LT1 manufactured in October of 1992 I’m interested in your OBD 1 computer connection. Is there a video that shows how you hook up your laptop to see engine performance? Thanks again.

[@Amundred]

I am not sure if I ever made a video of the connection, but I did order a cable from a website specifically for this - when I get back home I can look to see if I have the website saved!

[@jeepguymb45]

@@Amundred please do a video Thanks again

[@deney54]

Sorry man, But I did finish my 92 vette with the Optispark, And it runs great ... let it warm up, hit the throttle and she's back to normal...so new Optispark, top seal, coil, wires, plugs, water pump, belt, About 500 bucks latter, now to the brakes and yesterday had my new tires put on the stock wheels. I still think it's your computer..... it's not letting the RPMs to rev up, Check all connectors to your ECM, I would go for a new ECM $200 I think.... Good luck

[@geneyus6411]

How did you remove/install your balancer?

[@geneyus6411]

That's awesome about your 92. That's a lot of work!

[@Amundred]

I am glad to hear that your's was fixed with the Opti replacement! I honestly thought that this was my original issue when I started doing all of these videos! I will have the software and plug today so that I can hook my laptop up and see what it looks like in the software. It definitely could be the ECM (others have suggested this as well!) and that may be the next thing that gets ordered! Thanks for stopping by and letting me know what your fix was!

[@deney54]

@@geneyus6411 You don't need to remove the balancer ... they are two piece, just three bolts and slide it out, the main yoke stays on the crank, so I did not replace that seal, just the seal behind the water pump ... they say the whole job for Opti is 5 hours and if you clean everything and take your time, I could see 5 hours.

[@geneyus6411]

@@deney54 You weren't tempted to replace the timing cover seal, crank seal??

[@hevy15]

I need help, I would like to know how many knock sensors my 1996 Camaro z28 5.7 T-56 occupies.... I would greatly appreciate the help.. Greetings!

[@Amundred]

I believe just the one in front of the starter on the passenger side?

[@hevy15]

@@Amundred So it only has a knock sensor

[@Amundred]

@@hevy15 yes, I believe that the LT1 in Camaro/Firebird only has the one knock sensor 👍

[@hevy15]

@@Amundred Thank you very much for the help friend, Greetings!

[@Amundred]

@@hevy15 You are welcome! Thanks for watching and commenting!!!

[@devingullatte3859]

Would incorrect knock sensor from Camaro make the c4 spark knock and run hot

[@Amundred]

Hmm...possibly...the knock sensor will tell the computer to adjust the timing and could potentially cause issues if the knock sensor is not correct and not working properly

[@devingullatte3859]

@@Amundred 👍🏽 appreciate it

[@Amundred]

Alright everyone...update. I was able to connect the OBD1 plug and software. I am getting one consistent DTC - H42 in Module 4 (ECM) which is an "EST SYstem Error" When I look up this code, it is DTC 42 - Ignition Control (IC) Circuit (Shorted or Grounded Circuit) I can pretty much rule out an actual grounded hot wire or the car would not run (from the research I performed today and reading up on this). This does not rule out a bad connection somewhere between the ECM and Ignition Coil though. Additionally, this does seem to be an indicator of a bad ECM from what I have been reading as well. I may end up ordering a replacement ECM. If this does NOT fix the car, it becomes a real pain in the butt as I will have to chase down wiring and more than likely replace connectors in the vehicle. I also noticed when the data was being logged that when the car would misfire, multiple DTCs would pop up for all kinds of things from Oil Pressure, water temp, O2 sensors, ICM, etc which has me leaning towards a bad computer as opposed to just a wire connector being bad between the control module and ECM. I will order a replacement ECM and install that for the next video. Possibly have that one up by next Monday...stay tuned for more!

[@geneyus6411]

That should do it!!! Just like the guy I told you about, said he replaced ICM connector and ECU connectors. How much for the ECM?

[@Amundred]

@@geneyus6411 I had to send a request for a quote...I was searching online and found a site called Flagship1 that will program and send you a replacement...waiting for a response on price. I can find them for $200ish but they need to be programmed

[@geneyus6411]

You should really pull your battery and check all those fusible links/ and ground. That could be a cheap fix! Maybe your ICM wiring, connector is fried like the other guy also. Saw how rough you are on connectors,lol

[@geneyus6411]

@@Amundred Not to bad, as long as he doesn't deny your request!😂🤣😅

[@Amundred]

@@geneyus6411 I checked all of my wiring today around the ICM and coil, I tested all of the fuses, checked the battery and cables...I could not find a wiring issue

[@theredwedge9446]

Which motor is that ? Lt1 ?

[@Amundred]

Yup, LT1

[@theredwedge9446]

@@Amundred Thanks ! I could not find my knock sensor but as soon as I went under the car like you did I saw it immediately.

[@proffxxl]

At this point I feel like you have basically rebuilt the engine. LOL

[@Amundred]

No kidding! Every sensor on the engine will basically be new and the majority of a lot of other parts as well! Once this dang thing runs properly, I will not have to worry about any of these parts! lol

[@geneyus6411]

Everything he did, it needed it.

[@geneyus6411]

@@Amundred oh yeah! Well worth it👍

[@geneyus6411]

Do yourself a favor, on your next coffee break, try using the funnel the proper way! It seems like you were in rush mode. I've recommended that many times and never heard a complaint. Also you could have had your new sensor ready to screw in as you pulled the old ones, cut down on mess!

[@Amundred]

I used the funnel...I just did not see the benefit over just filling up through the expansion tank. It does it the same way...but instead of pouring coolant into the funnel, you pour it directly into the tank. 🤷‍♂

[@geneyus6411]

@@Amundred Just filling your coolant up in the expansion tank is not bleeding any air. That's an air bleed specific funnel, not just any funnel,lol

[@Amundred]

The one one benefit that I did like...not having to worry about the coolant overflowing and leaking all over the place. WHen not using the funnel, the coolant levels rise and fall as the car "burps" and you have to really be on your game to close the cap when the coolant starts flowing to avoid the overflow. With the funnel, that was not an issue as there is plenty of room for this.

[@geneyus6411]

@@Amundred When it starts rising like that, you should be done. Turn the engine off immediately and it will not overflow. You should also run your heater to get air out of heater core. Makes a huge difference in these cars getting all the air out or they overheat like crap. Then you take what's left on uour funnel and directly fill your overflow tank by the radiator and done! Nothing spilled,lol

[@deney54]

I used a Funnel too. It works just fine ... then start the car with the cap off and you can see the stream of fluid coming from the water pump and slowly fill.... it works for me

[@geneyus6411]

You look crazier than normal in that picture,lol. Were you hyped up on red bull?? Cool parts canon graphic.

[@Amundred]

🤪

[@geneyus6411]

@@Amundred Why you so crazy now??? I'm outside working on my repair. Going good, I hope!

[@Amundred]

@@geneyus6411 my car is making me crazy! Will.you have your's running today?

[@geneyus6411]

@@Amundred possibly or close to it. I went this morning to a specialty bolt place, bought a m10x1.5 x 3in bolt. Last one they had. It's a grade 5 black oxide coated. Little by little cutting it to length. It threads into the original bracket very tight. Getting ready to put red loctite on the snout piece I made off the sacrificial tensioner,lol Very tight work space, dremel is the main tool today. The new bolt with star lock washer was $1

[@geneyus6411]

@@Amundred Ever notice that the little snout the pulley spins on never wears out??? It's always the cheap pulley that wears out🤣

[@geneyus6411]

You need to get yourself some harbor freight furniture pads to lay on🙄

[@Amundred]

Haha...for sure 😂

[@frankhusted9327]

Did fuel pump in that car I put a fuel pump in my car it was hesitating real bad what a hose on a fuel pump for the motor is that little hose down and sits in the gas was blow it was bypassing blowing up was making a car bog out that's all it was I popped a brand new fuel pump back out and put two hose clamps on that little hose and it was like brand new

[@johnnywhite238]

Replace fuel pressure regulator guaranteed thats problem

[@Amundred]

Replaced that already 😢

[@geneyus6411]

So much for that guarantee!😈

[@geneyus6411]

You never said what you ended up using on the actual knock sensor, socket or wrench??? Why did you say all dirty and gross at the end?? We all know you had a coolant shower!!!😃😂🤣

[@Amundred]

I used the socket on the knock sensors

[@geneyus6411]

@@Amundred Nice! When you tightened your new o2 sensors, was it tough??? Also have you ever done any maintenance to the push lock fuel lines for the fuel lines to rail???

[@geneyus6411]

@@Amundred I watched your knock sensor video again for motivation,lol. It's the one where you dissed my funnel😳 When you actually pulled the old knock sensors, did the coolant stink or seem dirty coming from the block?? I also saw in the video how the o2 sensor was clipped to the shield.

[@Amundred]

@@geneyus6411 the coolant was clean that came out of mine...but I have pulled the water pump off like 4 times in the last year, flushed the coolant a couple of times and haven't driven it a single mile 😂

[@Amundred]

@@geneyus6411 my O2 sensors were easy and haven't done much with the fuel rails/lines. I have replaced the fuel filter, fuel pressure regulator and fuel pump, but that was really all.