LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Help with missfire

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Old Nov 28, 2011 | 10:25 PM
  #16  
V8 LifeStyle's Avatar
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From: Miami,Fl
Re: Help with missfire

Couldn't i just use the voltmetter and see how many oms it produces and see which one produces less
Old Nov 29, 2011 | 05:47 AM
  #17  
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You're putting the cart before the horse

Have you pulled the plugs from those 2 cylinders? This will be the best to find out if the problem is fuel or spark related. If they are not black, it's highly likely the problem is too little fuel.

It is highly UNLIKELY it's a problem that you would see with the signal to the injectors. That is why I suggested you check the injector spray pattern of those 2 cylinders to see what they looked like compared to those of the other cylinders. It's much more likely the fuel is restricted to those injectors then it is a trigger signal problem. Particularly since they are the last 2 injectors on that side of the engine.

This requires nothing other than hand tools to lift the injector rails and have someone crank it over while you check. Be sure to pressurize the rails to look for dripping injectors when they are off also.

Last edited by Guest47904; Nov 29, 2011 at 05:53 AM.
Old Nov 29, 2011 | 08:31 AM
  #18  
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Re: Help with missfire

K I will pull the plugs asap as well as the injectors thanks alot u might hate me because I'm going to another question
Let's say it is a fuel problem with the injectors why would they cause a miss only when the motor Is warm ( I literally just fired her up before going to school and it wasnt missing till it was at normal temp) I did try running the car I'n open loop and still missed
Old Dec 1, 2011 | 10:57 AM
  #19  
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Angry Re: Help with missfire

ok i pulled the plugs and they were all clean ( no black) they are new plugs that have been in the car for two weeks they have very lil carbon dust at the tip part that connects to the thread of the plug ( not the gap side of the tip) i unplugged the o2 and nothing still missfire still havnt check the injectors for dripping or any other fault but ill get to it on sunday any more thoughts on what can be going on
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