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#1
02-27-2011, 10:20 AM
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GMC Jimmy Starting problems
When my 2001 GMC Jimmy sits for more than ten minutes, when I try to start it the starter cranks for about 5 seconds before it starts. If I let the fuel pump build up pressure first and the turn the starter it starts right up
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#2
02-27-2011, 10:34 AM
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Re: GMC Jimmy Starting problems
I'd hook up a fuel pressure gage and watch bleed down pressure after pump shuts off- does it drop fast-- like 60 psi to 0 in less than 30 seconds? You may have a fuel leak where you can't see it- like in the tank.
__________________
Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles-
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#3
02-27-2011, 01:48 PM
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Re: GMC Jimmy Starting problems
Inspect the fuel pressure regulator too, remove the vacuum hose running to it and look for any fuel contamination IN the hose, if you see any replace the regulator.
__________________
1995 Lincoln Town Car 4.6 Signature 1997 Pontiac Grand Prix GT 3.8 2000 Ford Windstar SE 3.8
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#4
02-27-2011, 10:04 PM
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Re: GMC Jimmy Starting problems
The fuel pressure regulator is inside the plenum and does not have a vacuum line to it.
Check fuel pressure and leakdown: Ignition ON, engine OFF, fuel pump running: Pressure must be 60psi to 66psi and must remain above 55psi for 3 to 5 minutes after the pump shuts off. As brcidd mentioned, the leak could be in the tank.... or it could be in the plenum. A pressure and leakdown test will determine if there is a leak, it will not tell where it is. The fuel pump must be isolated from the system immediately after the pump pressurizes the system, (and shuts off) to determine if the leak is in the tank or in the plenum.
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You have to know how it works, to figure out why it doesn't.
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#5
02-27-2011, 10:55 PM
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Re: GMC Jimmy Starting problems
Oh I see, in that case I'm sorry for my mistake. I hope this problem gets fixed soon, I had a very similar problem and the it turned to be the fuel pump but I was advised to check the FPR that way.
Best regards, Oscar.
__________________
1995 Lincoln Town Car 4.6 Signature 1997 Pontiac Grand Prix GT 3.8 2000 Ford Windstar SE 3.8
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