myblack98gst
15+ Year Contributor
- 578
- 1
- Jun 22, 2003
-
Elizabethtown,
Kentucky
okay I have been hunting this problem for a good while now my car has issues that I cannot seem to hunt out. at this point it pretty much points to the ECU which sucks.
basically I have sparatic issues one run it will be perfect the next after I let out of the gas it will have a missfire that will last for an unknown amount of time. coil 1/4 just stops firing all together.
I have swapped out to a 93 cam angle sensor because my 90 the wires were hard and cracked and could not find one any better junkyard diving. the car ran the same before and after.
swapped the PTM out for a 93 also so I could get rid of the tach adapter to make the 93 eprom work correctly. while I was doing this I bypassed the factory wiring harness concerned that could be causing the problem so I just ran wires directly from pins 54-55 out to the module then straight from the module to the coils. still runs the same.
I have tried a couple of different coils with no real difference. another thing I have noticed is if you pull the plug wires off one by one while it is running. the towers for 1&3 are significantly stronger than on 4&2?? 4&2 will stop arcing within a 1/2 inch of pulling the wire off. 1&3 will stop arcing the wire and jump over to the bracket they are very obviously stronger??
so here is my questions?
1. is there a component in the ECU that can be replaced to possibly correct the missfire issues I am having?
2. whats with the spark energy difference between the towers of the same coil?
basically I have sparatic issues one run it will be perfect the next after I let out of the gas it will have a missfire that will last for an unknown amount of time. coil 1/4 just stops firing all together.
I have swapped out to a 93 cam angle sensor because my 90 the wires were hard and cracked and could not find one any better junkyard diving. the car ran the same before and after.
swapped the PTM out for a 93 also so I could get rid of the tach adapter to make the 93 eprom work correctly. while I was doing this I bypassed the factory wiring harness concerned that could be causing the problem so I just ran wires directly from pins 54-55 out to the module then straight from the module to the coils. still runs the same.
I have tried a couple of different coils with no real difference. another thing I have noticed is if you pull the plug wires off one by one while it is running. the towers for 1&3 are significantly stronger than on 4&2?? 4&2 will stop arcing within a 1/2 inch of pulling the wire off. 1&3 will stop arcing the wire and jump over to the bracket they are very obviously stronger??
so here is my questions?
1. is there a component in the ECU that can be replaced to possibly correct the missfire issues I am having?
2. whats with the spark energy difference between the towers of the same coil?