LOSS OF POWER - Automotive Wiring and Electrical


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LOSS OF POWER

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CRAIGL
New User

Oct 27, 2008, 8:36 PM

Post #1 of 4 (1292 views)

LOSS OF POWER	Sign In

2004/GMC ENVOY 106,000 MILES CAR HESITATES WHEN STARTING. THEN WHEN RUNNING IF YOU SWITCH THE HEAT TO DEFROST (WINDSHIELD) THE CAR LOSSES ALL POWER AND STALLS OUT. WHILE THE CAR IS STALLING OUT THERE IS A WHINING NOISE THAT COMES FROM THE REAR OF THE CAR.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 27, 2008, 9:52 PM

Post #2 of 4 (1286 views)

Re: LOSS OF POWER	Sign In

A scenario that could explain this is the fuel pump is failing and the connection between defrost and the initiation of the problem could be the extra load of the A/C coming on as it can with the defrost request. The noise is quite possibly the fuel pump which is in the gas tank.

I'd get a pressure reading on the fuel pump AND listen hard for where the noise originates. You really shouldn't hear a big change in the pump in any circumstance - just the normal buzz that they do make,

T

CRAIGL
New User

Oct 28, 2008, 12:03 AM

Post #3 of 4 (1279 views)

Re: LOSS OF POWER	Sign In

THANK YOU FOR YOUR HELP. I WILL DEFINATELY CHECK THAT FIRST. MY GUT WAS TELLING ME THAT IT WAS THE FUEL PUMP BUT AUTO ZONE SAID IT WAS ELECTRICAL.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 28, 2008, 4:31 AM

Post #4 of 4 (1274 views)

Re: LOSS OF POWER	Sign In

Certainly test things out to be as sure as you can. Wiring to fuel pumps has been trouble with corrosion but doesn't really account for the noise.

Fuel pressure test in conjuction with a volt reading with assorted item pu on would be informative and there might be more than just one thing going on here,

T

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