Problem with my = 97 Olds Aurora 4.0 l v8
Engine size = 4.0
Replaced ECT Sensor
GM tech = kk
question = Hi there,
Just found this site looking on the net for a solution to my problem.
Having Long Crank Problems. in the mornings, when cold (+5 deg Celcius or lower)
engine cranks and fires intermittently. Once it has been cranked for about 30 seconds
on and off, it sputters for about 5 seconds, and then takes off and runs great till it gets
cold again. Doesn't seem to be a fuel pressure problem, as running the pump 5 or 6
times prior to starting makes no difference.
No-one seems to have any idea whats going on. ECT sensor working fine while being
watched on a scan tool.
Engine size = 4.0
Replaced ECT Sensor
GM tech = kk
question = Hi there,
Just found this site looking on the net for a solution to my problem.
Having Long Crank Problems. in the mornings, when cold (+5 deg Celcius or lower)
engine cranks and fires intermittently. Once it has been cranked for about 30 seconds
on and off, it sputters for about 5 seconds, and then takes off and runs great till it gets
cold again. Doesn't seem to be a fuel pressure problem, as running the pump 5 or 6
times prior to starting makes no difference.
No-one seems to have any idea whats going on. ECT sensor working fine while being
watched on a scan tool.
This may very well be a fuel pressure problem.
These pumps tend to build pressure slowly in the cold when they are are failing.
Need to put a fuel pressure gauge on to see if pressure is low at first try, then starts
building up to the point where it finally starts.
Another possibility is a leaking fuel pressure regulator.
This would cause a rich condition, hard start, and rough running until it clears out. But
this would also cause a hard start when the engine is hot and has sat for an hour or so.
Pull the vacuum hose of regulator and smell for gas.
This is all assuming that the plugs are in good shape, and it does not burn coolant or oil.
These pumps tend to build pressure slowly in the cold when they are are failing.
Need to put a fuel pressure gauge on to see if pressure is low at first try, then starts
building up to the point where it finally starts.
Another possibility is a leaking fuel pressure regulator.
This would cause a rich condition, hard start, and rough running until it clears out. But
this would also cause a hard start when the engine is hot and has sat for an hour or so.
Pull the vacuum hose of regulator and smell for gas.
This is all assuming that the plugs are in good shape, and it does not burn coolant or oil.