Driving me insane!!!!!!!!!
#21
Drifting
Thread Starter
I would also think ignition issue also.....if the cap, rotor, electrical connections, ICM, plugs and spark wires are good and the HEI coil is still getting "hot" as described in the thread below change the coil out now.....http://forums.corvetteforum.com/c4-t...-question.html
On some of my high HP stuff our distributer caps are vented so you do not get cross fire from electrons. Have any of you guys delt with this issue on the C4? To me the stock HEI should be more then happy until 6000 rpm or better.
I want to go to the track this Friday, I have also found a new set of 275/40/17 MT ET street for 400 dollars, but I do not want to buy the tires until I know what the deal is with the car.
#22
Le Mans Master
Did you change to a "new" HEI coil before or after you had the super heating problem with your distributor cap?
If you look under the body of the distributor (down by the pick-up coil area) you'll see that the distibutor is "vented" down there.
I'd check the spark plug wires for "shorts" and pull all the plugs (to inspect/gauge them) again before you swap in a "new" coil.
If you look under the body of the distributor (down by the pick-up coil area) you'll see that the distibutor is "vented" down there.
I'd check the spark plug wires for "shorts" and pull all the plugs (to inspect/gauge them) again before you swap in a "new" coil.
#23
Drifting
Thread Starter
Did you change to a "new" HEI coil before or after you had the super heating problem with your distributor cap?
If you look under the body of the distributor (down by the pick-up coil area) you'll see that the distibutor is "vented" down there.
I'd check the spark plug wires for "shorts" and pull all the plugs (to inspect/gauge them) again before you swap in a "new" coil.
If you look under the body of the distributor (down by the pick-up coil area) you'll see that the distibutor is "vented" down there.
I'd check the spark plug wires for "shorts" and pull all the plugs (to inspect/gauge them) again before you swap in a "new" coil.
For the record it does not matter if the car is hot or cold it will do this just the same. It also comes and goes for no reason. Right after that last video was taken I said screw it and drove home . ( 30 ) miles. About a block from the house I staged the car then launched it and it ran perfect. GRIMLINS
#24
Instructor
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Location: Tulsa OK
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Sure sounds like an ignition miss to me. Cap rotor plugs wires sort of thing. Unless it is just the recording it sure sounded like it had a skip for the entire run to be honest. It is pretty hard to make an engine skip from a load dump like launching the car with too much fuel. It might get lazy and nose over but seldom miss fire.
#25
Drifting
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#26
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I am guessing you cooked the HEI. Might try checking the bearings on the HEI make sure the drive shaft for it turns free and true. I would tear it apart and inspect eveything or replace it if you have the coin. just my 2cts
#27
Le Mans Master
I think I would pull the HEI and go over it with a fine tooth comb. Check for up & down excessive play, etc. I'm about 99% sure that is an electrical gremlin. After you check the HEI then go looking for loose connectors that are moving under hard acceleration.
#28
Drifting
Thread Starter
I have had the dist out and it looked good, I have also looked at the wear line on the points in the dist cap and they look good. Saturday I took everything apart again and made sure the connectors for the module where tight and that I had good grease under the new module. I took the cover off the ECM for the chip and put some foam under the lid to make sure the chip was not moving. Then I took it down the street stone cold and launched it. The car did the same as the video. Right now my friend has the car and he is swapping stuff from his car to mine to check it that way. He swapped out the TPS and the problem went away, then he put mine back on and the problem is still gone. Nothing shows up on code scans and there is not spike or drop in fuel pressure.
#29
Le Mans Master
I'm sure you checked this but is the little spring in place that keeps the pressure on the center of the rotor? I'm going to venture to say that it is something very simple that has been overlooked.
#30
Drifting
Thread Starter
My friend has been data logging the problem and when the miss happens the engine goes rich according to the O2 sensor, so it has to be ignition. He is going to try to change out the factory coil for a performance coil and see what that does.
#32
Drifting
Thread Starter
#34
Drifting
Thread Starter
#37
Melting Slicks
Dave
#40
Le Mans Master
I'm not sure if this would be a factor but what about the grounds on the DRIVER'S side of the engine? That side lifts under acceleration, maybe a loose or partially frayed ground??