QuestionA mechanic told me I needed a new fuel pump for my 92 Firebird. This is a somewhat major job so I want to be sure before repairing.(the same mechanic told me it was a mapping sensor 1st. - it wasn't).
I was returning home when the engine suddenly stalled. I restarted but it was sputtering and lurching all the way home. Barely drivable.
I've replaced the mapping sensor,plugs and wires,dist cap, and gas.
The car has a 3.1 V6, and fuel injection. The onboard diagnostics show no trouble code and I can hear the fuel pump running strong when I turn the ignition on. Could this be something other than the fuel pump?
Info appreciated
AnswerYes, it could be something else.
To eliminate the fuel pump for sure, a pressure test can be performed, which can also test the filter, and the pressure regulator.
Your symptoms could be just the EGR valve not seating completely due to some carbon, etc.Some injector cleaner through the tank might help.
Also, look for vacuum leaks.
And it is a MAP sensor, meaning manifold absolute pressure, or in other words, vacuum. It reads the vacuum in the intake manifold, and if the EGR valve is stuck, or some other vacuum leak, it will read it correctly as low vacuum....and the car will run like you say.
Tune up is another possibility.
Good luck,
Van
