Question about Cars & Trucks
The problem is that you are guessing what the problem is. You have a high-end Cadillac Escalade. Take it to a dealership, as they have the factory diagnostic equipment to correctly determine what single component is causing the problem.. Your problem is almost certainly one of the dozens of electronic sensors although 'acting up' is a pretty broad spectrum to guess.
Posted on Dec 25, 2017
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Posted on Jan 02, 2017
hook up a gas pressure gauge to the schrader valve. should be 50-60psi. If it doesnt have any, check relays, fuses. When you replaced the fuel pump you should have checked for 12V to the pump to confirm it was bad. I am assuming you did this. If not its worth checking again. If you dont have 12v its probably a fuse, relay, or wiring problem. Possibly bad ground?
Posted on May 03, 2009
had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!
Posted on Jun 06, 2009
That is a tough pump to service in that model but you may need to have one more look at it and do a possible replacement again...these are not good numbers high and low.
Posted on Jul 16, 2009
REPLACE FUEL FILTER IF IT HAS BEEN A WHILE.ALSO THE FUEL PUMP RELAY.CHECK FUEL PRESSURE.IT SHOULD BE 35 - 45 PSI. THE 4.9 ENGINE FUEL PRESSURE SHOULD BE 50 -60 PSI.IF FUEL PRESSURE IS GOOD.SCAN IT CHECK THE EGR VALVE / THE MASS AIR FLOW SENSOR / THE IDLE SPEED CONTROL / ALSO A FAULTY FUEL INJECTOR OR INJECTORS WILL CAUSE PROBLEM.CHECK ALL ELECTRICAL WIRE CONNECTIONS TO THE IGNITION COIL AND DISTRIBUTOR.
Posted on Aug 30, 2009
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