Engine not idiling problem
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Joined: Mar 2003
Posts: 213
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From: Maine
Car: 1986 Iroc-Z
Engine: 305 TPI
Transmission: Automatic
Engine not idiling problem
if i turn my car on and just move it so it only runs for a minute or so the next time i go to get into it, it wont start becasue it seems like it is flooded....anyone know y?
Any other indications that it is indeed flooded? Do you smell raw fuel? Does openig the throttle about 30% help with starting?
If it is in fact flooding, the likely cause(s) is leaking injectors, including the cold start injector on your '86. A leaking fuel pressure regulator, stuck cold start injecotr control unit, or excessive fuel pressure. The latter is least likely, and yet still possible.
Testing for injector leakage will require a fuel pressure gauge and cycling the ignition to build pressure. Monitor the pressure after the fuel pump has shut off, and see if the pressure holds with the pump off for at least 15 minutes. If not, you may have a leaking injector(s).
The easiest way to determine if the FPR is leaking internally is to remove the vacuum hose from the pilot spring canister while the engine is running and see if fuel is leaking from the regulator.
The cold start in jector control diagnosis is a bit more involved, but it is less likely to be the problem. Check the other two candidates first.
If it is in fact flooding, the likely cause(s) is leaking injectors, including the cold start injector on your '86. A leaking fuel pressure regulator, stuck cold start injecotr control unit, or excessive fuel pressure. The latter is least likely, and yet still possible.
Testing for injector leakage will require a fuel pressure gauge and cycling the ignition to build pressure. Monitor the pressure after the fuel pump has shut off, and see if the pressure holds with the pump off for at least 15 minutes. If not, you may have a leaking injector(s).
The easiest way to determine if the FPR is leaking internally is to remove the vacuum hose from the pilot spring canister while the engine is running and see if fuel is leaking from the regulator.
The cold start in jector control diagnosis is a bit more involved, but it is less likely to be the problem. Check the other two candidates first.
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