Question about Chevrolet Express
I have done the MAF, all O2 sensors, full tune up plugs, wires, distributor, fuel filter, air filter, fuel pump.
I'd be suspicious of timing, like maybe just a bit too advanced. Possible cause could be a vacuum leak. Does it have a vacuum pot on the distributor? If so, make sure it is working properly. If it is stuck, the timing will not retard under low vacuum, making your engine feel sorry for itself.
Posted on Apr 29, 2015
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Posted on Jan 02, 2017
before you drop tank again, check fuses & relay.then disconnect fuel line @ filter turn key to on position should hear fuel pump run and get gas stream out of line. if no flow from line new pump faulty be sure & remove negative battery cable first good luck.
Posted on Jun 20, 2009
Some things you can check. First, with the engine off, look down into the carburetor and quickly move the throttle. You should see a squirt of fuel. If not, the accelerator pump is bad. If that is OK, check the spark itself. It should bridge a half inch gap with no problem and should be healthy (have good "snap" and bluish color). If OK, check the two wires that run from the ignition module inside the distributor, down under the breaker plate.Often those wires can partially break or short to the housing...when the advance moves the plate it will cause a problem.
Only other thing I can think of is timing. That engine likes from 8 to 12 degrees advance (depends on fuel quality) if it's set wrong it can make it fall on it's face when you floor it. (bad chain can do that too).
Posted on Jun 22, 2010
it is possibly the throttle position sensor(tps) malfunctioning. basically the computer or "brain" of the car thinks the throttle is in a different position than it really is and automatically makes adjustments to fuel, air ect.... based on these false readings from the sensor thus causing the engine to react a little different when you expect to have power.
Posted on May 14, 2011
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