curacaoz28

Hy guys,

a friend of my has a 93 vette, the problem is it drive fine and after 10 minutes it shuts off, he has to wait about 10 minutes, and then it starts again and drive fine for 5 minutes, then it shuts off again, and so on, the more he waits to start the car, the loner the car drives. what could this be? he allready replaced the fuel pump.

thanks

y2keglide

iTrader: (2)

Optispark dizzys do a lot of weird things like that,especially early ones without the vent tube. Get moisture in there and they will do strange things for a while before they fail completely. I had a '93 Z28 that acted just like that before the Opti failed.

96lt1m6

iTrader: (31)

Sounds more like the ICM is heating up and causing failure
https://ls1tech.com/forums/lt1-lt4-m...ol-module.html

curacaoz28

okk thanks, it seems that he allready replaced the icm so it has to be the opti....

96lt1m6

iTrader: (31)

Don't get too excited my friend the problem could still very well be the ICM they can fail especially if a cheap unit was installed..

curacaoz28

ohh okk, i will tell him, its up to him what he does, and i will tell him about the shbox mod to put a spacer between the icm and the braked so it does get all the heat

CFLFORMULA93

i would like to agree with the icm theory. get a known good or new icm put on with the spacers as mentioned. i think i used some heat sink compound on the back as well and spaced about 1/2-3/4". is the motor putting off any other codes? im thinking maybe faulty o2 sensors possible? i would be checking the little small inexpensive things before assuming its the opti.

SS RRR

iTrader: (2)

check your fuel pressure. those symptoms are textbook for a fuel pump overheating.

96lt1m6

iTrader: (31)

I wanted to say this but he said it was new. We all know NEW stuff can be worse than the old one.

96lt1m6

iTrader: (31)

Verdict?

curacaoz28

owner still says its the opti, he ordered one

Ruken

iTrader: (1)

I had a issue similar with one of my other vehicles, turns out there was a break inside the sheath of my CPS wire. When it was cold there was continuity. Drive it for a bit things would get hot/warm and the wire sheath became pliable stretching and breaking continuity. Wait about and hour and it would start right up.

curacaoz28

after troubleshooting they a convinced its the ECM, said that they held a fan (those household ones) above it and the car worded for more than half an hour

Brian Dungan

I've recently replaced MSD cap and rotor
auto zone ignition module, ac delco coil
car starts fine in morning drive 8 miles stopped start finecpull out on road 500 ft ghost turns car off wait couple minutes started parked came back started 10 ft off again wait started then ran fine for 45 min drive drove home fine went out later made it to subway no problem leave off start off start off then finally start go home
I've got a new ac delco ignition module coming keeping fingers crossed

transam5.7lt1

iTrader: (18)

Most auto part stores used to have equipment to test these ignition modules, I know for sure Advance Auto did. When I had my 1994 T/A suddenly one day car would not start, weird since car was running perfectly well the day before, so I took it off and took it to AAP. They tested it, module would get very hot as it does on the vehicle by the 3rd time it was tested, so if their machine said it tested good the 3 times, I would trust it. It did test bad, got a new one from them, installed it and car was running again with no issues.