1988 Pontiac Fiero wont stay running

Tiny
ERIC CUMMINS
  • MEMBER
  • 1988 PONTIAC FIERO
  • 152,000 MILES
My fiero will start good. But once the temperature hits about160 it will die. Once cooling down it will start and run good till the temperature hits 160 then will die again. I checked yhe engine coolant, changed the fuel injector, plugs, wires, and air filter. What could be the problem and how to fix it?
Monday, August 26th, 2013 AT 8:15 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
How long do you have to wait for the engine to restart? When it won't restart, have you checked for spark and fuel to the engine. One will most likely be missing. Once you determine which, then you will know which circuit to focus on.

Check that and let me know what you find.
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Monday, August 26th, 2013 AT 8:24 PM
Tiny
ERIC CUMMINS
  • MEMBER
  • 3 POSTS
Checked the spark which was good. Checked the fuel, even replaced the fuel injector and that's all good. It's got compression too. It turns over good and runs good till the temperature hits about 160. After it hits the temperature it the RPM just drops and if I give it gas it may sputter a little but dies. I try to start it back up and it turns over good but wont start. After about an hour or so it'll be cooled down enough to start. In which it'll run like nothing is wrong till the temperature hits about 160 again. When it dies the exhaust is really strong! And the cycle continues. Could it be some electrical sensor or something like that?
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Tuesday, August 27th, 2013 AT 7:08 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
During the time period that is doesn't restart (till it cools off) have you checked to see if there is spark and fuel to the engine? Also, you mentioned you smelled fuel the hotter it got. Check the catalytic converter and see if it is red hot when it is running and warms up. You may have a plugged converter. Also, you replaced the fuel injectors. Did you replace the regulator too? Have you confirmed fuel pump pressure is within the manufacturer's specs when the engine doesn't run? If there is too much pressure, it could be flooding the engine. Also, if the diaphram is bad in the regulator, it could be sucking fuel back and into the intake thus flooding the engine.

Let me know.
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Tuesday, August 27th, 2013 AT 2:05 PM

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