1995 GMC Jimmy wont stay running

HBOB

MEMBER
1995 GMC JIMMY
6 CYL
4WD
AUTOMATIC
255,100 MILES

It will start fine runs good untill it worms up then it lopes then dyes wont start till I squert gas in the intake then it will run till I give it gas then it galopes and dyes new fuel pump new pressure reg injector cleaned

Monday, September 6th, 2010 AT 5:48 PM

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Hi hbob, Welcome to 2carpros and TY for the donation

Do you hear the fuel pump come on for 2secs when key at run position if so check the fuel pressure if its within specs if okay-test the fuel pump and oil pressure sending unit and report back with some testing results.

NOTE: The FPOPSU powers the fuel pump after the engine starts.

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Monday, September 6th, 2010 AT 10:32 PM

HBOB

MEMBER
3 POSTS

New fuel pump test 66 psi oil 60 psi at idle not bad for 255000 mi new regulator cleaned injector will idle and run fine until it worms up flushed coolent changed thermostat to185 cleaned map still stalls wont start until it cools off and I put gas in the intake

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Tuesday, September 7th, 2010 AT 7:24 PM

HBOB

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3 POSTS

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Wednesday, September 8th, 2010 AT 7:47 PM

RASMATAZ

MECHANIC
75,992 POSTS

Next time it stalls don't wait for it to cool off-do below immediately to determine if its fuel or spark problem

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

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