- #62 of 93
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Re: Fuel pump [snowdawg1]
by tech1help
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Oct 25, 2008 (8:07 am)
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Replying to: snowdawg1 (Sep 27, 2008 3:10 pm)
check the 2 wire harness connector on the pump side,on top of fuel tank. you can reach it from directly behind left drive tire. make sure both wire connectors are tight within connector itself. the rubber grommets also need to be snug. it is recommended to change that specific harness pig tail,when changing pump. if you check fuel pressure at rear of engine,using proper pressure guage. fuel pressure has to be minimum 58 psi,while cranking,or it will not start. your pressure regulator may be at fault and not the fuel pump
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- #63 of 93
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Re: electrical problem [subrock86]
by tech1help
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Oct 25, 2008 (8:13 am)
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Replying to: subrock86 (Sep 28, 2008 1:35 am)
check crank position sensor and wiring. it will not allow engine to start, if it cannot read crank position and will not give (CEL), check engine light
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- #64 of 93
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runs rough after start up
by dorado1
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Nov 16, 2008 (4:41 am)
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have a 97 jimmy v6 two things i see happening.
missing or seems to be, also taking a few turns to crank.
was told that my fuel pressure could be a factor, from the fuel pump to throtle body. need to mention that I had 3 o2 sensors replaced to pass inspection
help
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- #65 of 93
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miss when driving
by captainkirk56
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Nov 17, 2008 (7:41 am)
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96 jimmy 4.3 miss (fuel,or electrical) slightly at 2000 rpm...seems to be getting worse, tach does not fluctuate during this miss, vehicle starts fine. but the miss seems to be getting worse, almost like a cross fire (ignition)...????
any ideas ,,hate going to garage and get 1000 bill for a parts replacer???
see where fuel pressure is very sensitive on these gmc's
and still could have same problem.
thanks in advance
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- #66 of 93
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Re: miss when driving [captainkirk56]
by captainkirk56
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Nov 17, 2008 (7:43 am)
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Replying to: captainkirk56 (Nov 17, 2008 7:41 am)
forgot to say....occasional this problem shows up from a dead stop..pulling away..but not consistant...sometimes ok...sometimes not????
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- #67 of 93
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99 GMC Jimmy hesitation problem
by nljewell
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Dec 02, 2008 (6:08 am)
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My Jimmy is hesitating when first taking off, only when engine is cold. And occasionally when at a steady speed, the rpm's will surge up alittle. I have changed plugs and wires, put new fuel filter on, replaced egr valve, added some BG44K, and am waiting on a new cap and rotor in the mail. I am out of ideas of what is wrong. Any suggestions?
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- #68 of 93
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Re: 99 GMC Jimmy hesitation problem [nljewell]
by nljewell
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Dec 03, 2008 (1:24 pm)
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Replying to: nljewell (Dec 02, 2008 6:08 am)
Well I put on my new cap and rotor and that didn't do squat. I took it in for a diag. test this morning and the "mechanic" said he didn't know since there was no check engine light on, so he couldn't check the codes. My next steps are to change coil, temperature sending unit, and change trans. filter. Please reply if you have any ideas.
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- #69 of 93
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Re: 99 GMC Jimmy hesitation problem [nljewell]
by tech1help
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Dec 03, 2008 (3:03 pm)
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Replying to: nljewell (Dec 02, 2008 6:08 am)
when was the last time you checked your cat converter?sounds more like you engine may not be exhausting correctly. if you are driving and it feels like the engine feels like it is cutting in and out, especially when first started or sometimes wnhe you hit throttle, or going up hill. I would definetly be looking at the cat converter, or the fuel pressure regulator.
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- #70 of 93
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Re: 99 GMC Jimmy hesitation problem [tech1help]
by nljewell
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Dec 04, 2008 (4:50 am)
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Replying to: tech1help (Dec 03, 2008 3:03 pm)
Thank you tech1help, I will definitely give it a shot.
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- #71 of 93
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Re: 99 GMC Jimmy hesitation problem [tech1help]
by nljewell
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Dec 04, 2008 (9:41 am)
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Replying to: tech1help (Dec 03, 2008 3:03 pm)
Cat. converter tested good. Fuel pressure was at 55/58. Mechanic suggested to spray some carb cleaner around plenum when engine is cold, if idle goes up then that seal might be bad. He said when engine gets warmed up that seal will expand and the hesitation would stop, only causing hesitation when engine is cold.
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