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Torqhead kit throwing P0351, P0352, P0354, and P0355 codes
I purchased the torqhead kit for my 94 corvette and after having the car tuned its throwing a bunch of ignition codes P0351, P0352, P0354, and P0355. What could cause these codes to pop up, I believe these are codes for the ignition coils, however these codes seem pretty generic meaning they could be anything from injectors, coils, vacuum leak, or even cam signal. I have smoke tested the intake for vacuum leaks and nothing came up and everything is connected with no loose wiring. So I am really stumped on this. Is there a diagnostic procedure I can follow to find this problem. When I got it tuned I was told that the passenger O2 sensor was not responding, could this cause this problem? Thank you for any advice.
Try changing the Firing Order in theTune to reflect the SBC Firing Order. Usually the 0411 ECM come setup for LS1 Firing order. This field is only used to detect Misfires and does not physically dicate the Engine's Physical Firing Order. ( It's only used to indicate Misfires)
Try changing the Firing Order in theTune to reflect the SBC Firing Order. Usually the 0411 ECM come setup for LS1 Firing order. This field is only used to detect Misfires and does not physically dicate the Engine's Physical Firing Order. ( It's only used to indicate Misfires)
Unfortunately i do not have HP Tuners to check or change the firing order. I had the car dyno tuned successfully and it ran and drove fine coming home from the tune however it did throw a check engine light when i was leaving their shop and the tuner stated that my passenger side O2 sensor didn't appear to be responding. I am assuming the tuner or TorqHead changed the firing order to Small Block chevy firing order prior to this. I was wondering if the O2 sensor was plugged into the rear O2 sensor plug (Post-cat plug) instead of the main O2 sensor plug (pre-cat plug). Does anyone have a picture of where in the harness is the passenger pre-cat O2 sensor supposed to plug in that would be helpful to me as well. I am wondering, as crazy as this sounds, is it possible that 4 of the 8 coils quit working on me or are not sparking correctly?
Is there a way by looking at the harness to differentiate the rear passenger O2 sensor plug from the front O2 sensor plug. Does anyone have any pictures of the passenger side harness and how the O2 plugs are situated in the car so I can see if I have it plugged into the correct plug. The diagram should allow me to test with a multimeter to see if is working.
So I tested the voltage at all the switched 12v wires on the coils (D) and they all measured 12v or battery voltage, I tested all the low voltage signal wires at the coil (C) and they all measured around 5v, then I checked the signal ground wires (B) and Ground wires (A) for voltage to see if there was a short in the system and they only measured a volt. So all the wiring seems to check out as operational. I tried doing an ohm test on the bad coils and good coils and I couldn't get any of them to read, maybe I am doing something wrong with this. How do you test the resistance on the D580 style LS1 coils? From everything I've read I should have 0.4 to 0.6 ohms at the primary coil by connecting an ohmmeter between the positive (wire D) and negative (wire B) terminals on the coil. 2. Check the ignition coil secondary coil resistance by connecting an ohmmeter between the coil output terminal (where the spark plug wire connects) and the ignition coil negative terminal (wire A or B). The resistance should be 5000 to 7200 ohms. But for some reason when I perform this tes on both known good and possibly bad coils I don't get a readout on either. I looked at of the spark plugs on one of the effected cylinders and it looks very sooty so maybe my issue is fouled plugs.
What I 'm saying is to swap out the current 4 Coils from the Drivers side onto the Passenger side,, and the Current 4 Coils from the Passenger side onto the Driver's side. Then see if the Trouble Codes change. That would give some clue if indead its the Coils or something else.
It may be a good Idea to label the Coils from their Original Starting Positions before swapping them out
I think I cured the misfires... I replaced all of the LS1 coils with new ones and replaced all of the plugs. all of the holes appear to be firing correctly and it feels nice and responsive.
12-10-2023, 04:09 PM
Torqhead kit throwing P0351, P0352, P0354, and P0355 codes
