We started with replacing the igniton Module, then found that the starter was cracked and replace it. Checked all plug wires, they are fine, tested crank and cam senors nothing wrong there. Replaced the CPU car still on runs on 2 cylinders. Please Help. Oh and yes we did have the cpu flashed to car.
You said the the 2 cylinders in the middle has no fire. That will be 2 & 3. It has 2 coil packs. One runs 1 & 4 the other runs 2 & 3. Check the coil pack that runs 2 & 3....The firing order is 1,3,4,2... It runs because it hits,miss,hits,miss....just enough to keep it running....
First of all stop spending money on parts you need to do a compression test on all four cylinders. remember it takes 90 pounds to fire fuel if you have two cylinders at 145 pounds or 150 pounds then your two bad cylinders are 30 pounds or 50 pounds then theres your problem. you could have burnt valves or possibly the engine jumped timing. rule of thumb when ever you have a running problem always check engine compression before you do any repairs. and check for trouble codes.
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If you have a healthy spark (a blue snapping spark), it would not be a problem in the ignition system or the module. An orange, weak, or intermittent spark could point to trouble in the ignition.
I would check the timing on it, maybe it is a timing chain problem. It should have fired and ran a bit with the starter fluid. The fact that it didn't, even with a good spark, well, probably needs a little shop time investigating. Jumped timing from a worn chain? Low compression in one or more cylinders? A couple of things you need to consider. Good luck.
you have a SERIOUS electrical problem. - '.
BUT which fuses keep blowing - that is where we need to start.
1. is it the ignition circuit. - - does starter motor turn over when you trun the key.
2. is it the starter relay circuit.
3. is it the starter motor circuit.
4. is it the computer circuit. - - do you have fuel pumping to the engine and cylinders.
5. none of the above. - - do you have spark at the spark plugs.
the pcm may have a cracked board, i had an 88 cavalier z24 with the same problem, replced the ecu and it ran fine, the problem is that the boards inside the pcm crack and lose connection, the next time it acts up open the glove box and try tapping on the pcm, if the car responds at all, the pcm is bad
IS THE SECURITY LIGHT FLASHING AFTER A START ATTEMPT WHEN THE KEY IS LEFT IN THE RUN POSITION?
IF THE SECURITY LIGHT IS FLASHING LEAVE THE KEY IN THE RUN POSITION UNTIL IT GOES OUT, SHUT IT OFF, WAIT 10 SECONDS, THEN TRY TO START IT AGAIN. IF IT STARTS YOU HAVE A PROBLEM WITH THE THEFT MODULE, BCM, OR THE WIRING BETWEEN THEM.
you can test it but removing wires on the coil. they should have same strength as 1 and 4. if they are weaker then you have a bad coil. if nothing happens your have a bad module.
if you want put the 1,4 coil on the suspected bad tabs on the module and see if spark is same strength.that should do it. you pretty much did the right thing is swaping with what testing equipment you have to work with.
its most likely a bad module though. very common. when you test something always have someone explain how its tested and how it works.
The reason I'm asking this is because a dual coil fires BOTH plugs at the same time. If one plug doesn't fire right, the other won't either, even to a point that neither does. Kepp the coils where they are and swap the plugs and wires and see if you have a change. Let me know