1994 z28 wont stay running
05-20-2010, 04:30 AM
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1994 z28 wont stay running i have replaced the opti, head gaskets, plugs, and had the transmission rebuilt. I finally got it all back together and test drove it around my block a few times and on the highway and it ran ok meaning it did not turn off. I stuck it back in the shop and replaced some bolts on the A frame and adjusted the valves, and after that coundn't get to stay running. It starts and runs for about 5 minutes and dies, i try to start it agian and it just backfires, and blows black smoke out the tail pipes the only thing that i can notice is the 5 volts missing to the (iat) and there are no codes. It is a 1994 z28 lt1 stock.
05-20-2010, 09:49 PM
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did you locktite the rotor screws? seal cap? who made the new opti?...check entire wiring harness for splits nearly every electrical connection in my 93 had exposed bare wires from being twisted during assembly at base of connection plugs 16-17yrs of heat ain't good for wires/sensors sounds like something is getting heat stressed/cross wired and failing.....
05-21-2010, 11:48 AM
#4
^^^Sounds to me like your problem lies in one of those three things.
1) Make sure the plug wires are all tight and going to the right spark plug, then check the order again.
2) Hopefully you have a genuine AC Delco/Delphi opti installed.
3) I would readjust the rockers while the engine is running.
As for your issue with the IAC, I would get the wiring tested. But even with a bad/malfunctioning IAC, the car will start if you keep the throttle cracked open a little.
1) Make sure the plug wires are all tight and going to the right spark plug, then check the order again.
2) Hopefully you have a genuine AC Delco/Delphi opti installed.
3) I would readjust the rockers while the engine is running.
As for your issue with the IAC, I would get the wiring tested. But even with a bad/malfunctioning IAC, the car will start if you keep the throttle cracked open a little.
05-21-2010, 09:22 PM
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do u know where i could find a wiring harness for my 1994 z28 auto trans, i live in small town and have been looking for one for a long time but its hard because everybody that i talk to say that these cars are to old. Maybe aftermarket i saw one on ebay for around 450.00 but everything i have seen has been around 650 to 1200 dollars.
05-22-2010, 08:15 AM
#6
do u know where i could find a wiring harness for my 1994 z28 auto trans, i live in small town and have been looking for one for a long time but its hard because everybody that i talk to say that these cars are to old. Maybe aftermarket i saw one on ebay for around 450.00 but everything i have seen has been around 650 to 1200 dollars.
