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Car Forum / Chevrolet / Chevrolet Corvette / February 20061985 corvette fuel flooding issues
been working to get my car running, down to the last thing,,, the car only runs with wide open throttle,, this is due to too much fuel (flooding) fuel pressure hangs out about 38 psi, my shop books do not help, mass air flow appears to be working but not 100% sure, i checked voltage while it was running and get 1.9 to 2 volts (at full throttle which is the only way it runs) to the ECM. when first turning key on no run, the fuel pressure jumps to 40psi for about 2 secounds and then droppes to about 35,,, when trying to start the car it dosen't appeare to drop, which i thought it should. any ideas would be much appreciated!!! Check out the injectors...extra fuel should return to the tank and injectors should only open when required...someone on the CORVETTE FORUM can help you out. could this be a vacum issue as well. I checked the vacuum at the rear of the plenium and it doesn't appear to have vacuum,, which is what controlls the fuel pressure regulator. any idea what the vacuum should be reading. thanks You won't have any vacuum at wide open throttle. That's perfectly normal. 35 psi fuel pressure doesn't sound excessive, certainly not to the point where it would require a WOT to run. Sounds like it may be an injector stuck wide open, in particular cold start injector as that feeds all cyls. What is the history? How did the problem start. Were you driving along and it started flooding. Started it cold one day and happened then? Had it all apart, put it back together and the problem was there? Tracing the circumstances can be benneficial. As someone else said, unplugging all the injectors is a good place to start (or not start hopefully). If there is no fuel getting into the engine and it doesn't start, it tells you the fuel is entering via the injectors and not making it's way in somewhere else and that the injectors are not stuck open, but rather are being "told" to open wide. If it starts and runs with all injectors are unplugged one or more is stuck open or somehow fuel is finding it's way into the intake system (a leaking line that's spraying into the intake system somewhere. Unlikely, but possible). Let us know. Steve g. > could this be a vacum issue as well. > I checked the vacuum at the rear of the plenium and it doesn't appear > to have vacuum,, which is what controlls the fuel pressure regulator. > any idea what the vacuum should be reading. > thanks It could be a number of problems. Could be anything from a stuck injector to a bad coolant temp sensor. A scan tool would help. The mass air sensor doesn't make a difference until the system goes into closed loop mode after reaching operating temperature. I'd start by unplugging all the injectors (including the cold start injector) and seeing if it will fire. If so, then one is stuck or leaking. If not, then it could be a bad throttle position sensor, one of the coolant temp sensors, air temp sensor, etc... -rev |
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