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GMC Jimmy Fuel System

93 messages,  Last post on Aug 17, 2009 at 8:23 AM

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#64 of 93 runs rough after start up by dorado1 Nov 16, 2008 (4:41 am)
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
#65 of 93 miss when driving by captainkirk56 Nov 17, 2008 (7:41 am)
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 Replies to this message: captainkirk56 (Nov 17, 2008 7:43 am)
#66 of 93 Re: miss when driving [captainkirk56] by captainkirk56 Nov 17, 2008 (7:43 am)
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????
#67 of 93 99 GMC Jimmy hesitation problem by nljewell Dec 02, 2008 (6:08 am)
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? Replies to this message: nljewell (Dec 03, 2008 1:24 pm) tech1help (Dec 03, 2008 3:03 pm) nljewell (Dec 04, 2008 4:50 am) nljewell (Dec 04, 2008 9:41 am) nljewell (Dec 08, 2008 4:55 am)
#68 of 93 Re: 99 GMC Jimmy hesitation problem [nljewell] by nljewell Dec 03, 2008 (1:24 pm)
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.
#69 of 93 Re: 99 GMC Jimmy hesitation problem [nljewell] by tech1help Dec 03, 2008 (3:03 pm)
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. Replies to this message: nljewell (Dec 04, 2008 4:50 am) nljewell (Dec 04, 2008 9:41 am) nljewell (Dec 08, 2008 4:55 am)
#70 of 93 Re: 99 GMC Jimmy hesitation problem [tech1help] by nljewell Dec 04, 2008 (4:50 am)
Replying to: tech1help (Dec 03, 2008 3:03 pm) Thank you tech1help, I will definitely give it a shot.
#71 of 93 Re: 99 GMC Jimmy hesitation problem [tech1help] by nljewell Dec 04, 2008 (9:41 am)
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. Replies to this message: nljewell (Dec 08, 2008 4:55 am)
#72 of 93 99 jimmy starting problems by poorjimmy Dec 04, 2008 (4:03 pm)
well one day shut it off, went for lunch, then it wouldn't start, poured gas in throttle body, it would run till gas ran out, so I disconnected the inlet to the fuel filter and tried starting, but no fuel came out... went for some supper called tow truck, while waiting with the inlet line still disconnected, i tried starting and gas started pouring out?, so i connected fuel line to filter and it started no problem drove it home.   Next day started no problem, drove around town, came home shut it off, and wouldn't restart, this time poured gas in throttle body and still wouldn't even start this time, "scratching head"   check all fuses, replaced relay, disconnected fuel line and re tried, no fuel coming out... Left for a few days, went out tried to start started right up, tried 3 times then would start with or with gas in throttle body, i have ordered a new pump, and have changed fuel filter, just not sure why it all works one day then nothing, what really gets me is it will crank over but seems to be getting no spark and no fuel.   Any help would sure be nice.   thanks
#73 of 93 Re: 99 GMC Jimmy hesitation problem [nljewell] by nljewell Dec 08, 2008 (4:55 am)
Replying to: nljewell (Dec 04, 2008 9:41 am) I sprayed carb cleaner around plenum and nothing happened. When I was at work this weekend I parked inside, when I went to leave after it sitting for 13 hr. it took right off with no hesitation????

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