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zanej
Novice
Jul 28, 2009, 10:02 AM
Post #1 of 13
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2000
GMC
Jimmy
4.3L V6
app. 140 k miles
The vehicle is having trouble starting and tends to stall on accelleration from a complete stop. This only seems to happen during hot (95+) weather. When starting, the engine fires immediately but simply will not run. I've been told by a friend that my problem is the distributor module. Is this the same as the ignition control module, and if so, does that sound correct? Also, where is it located on the engine (diagram would be very helpful).
Thanks
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 28, 2009, 10:28 AM
Post #2 of 13
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Re: 2000 GMC Jimmy
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No, that doesn't sound correct at all. There are 2 things that come to mind. The most likely is the fuel pump but the Mass Air Flow sensor is a possibility.
What you need to do here is rig up a fuel pressure gauge so you can drive it and monitor the gauge so you can see if the pressure drops when the problem occurs. It does no good to test it at any other time. This engine is very, very pressure sensitive. The spec for this is 60 to 66PSI and it HAS to be within those specs at all times. If this drops to even 55, it won't run.
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zanej
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Jul 28, 2009, 10:36 AM
Post #3 of 13
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Re: 2000 GMC Jimmy
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Is it common for automotive stores to loan that gauge or is it something I need to buy and/or find a friend with one?
Also, if I do get one, where do I hook in to the fuel system?
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zanej
Novice
Jul 28, 2009, 10:38 AM
Post #4 of 13
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Re: 2000 GMC Jimmy
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Also, just out of curiosity, what makes you want to rule out the module?
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Hammer Time
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Jul 28, 2009, 10:39 AM
Post #5 of 13
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Re: 2000 GMC Jimmy
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Some of the larger chain auto parts stores will rent or loan the gauges.
If you reach way in the back of the engine, you will feel the fuel lines coming into the engine. One of them has a little plastic cap and a service port under it that you thread the gauge on to.. Try to get a long enough hose to run it under the back of the hood and tape the gauge to the windshield. Try not to pinch the hose with the hood.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jul 28, 2009, 10:40 AM)
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zanej
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Jul 28, 2009, 10:46 AM
Post #6 of 13
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Re: 2000 GMC Jimmy
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So a low pressure indicates that the fuel pump is beginning to have problems? Also, if the pressure is fine, where would you suggest I look next?
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Hammer Time
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Jul 28, 2009, 11:05 AM
Post #7 of 13
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Re: 2000 GMC Jimmy
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I can't stress enough that you have to observe this pressure during the failure.
Beyond that you will have to look at either the Mass air Flow sensor or a restricted catalytic converter.
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zanej
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Jul 28, 2009, 11:10 AM
Post #8 of 13
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Re: 2000 GMC Jimmy
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Funny you should mention the catalytic convertor, seeing as how it is busted loose from it's housing and simply rattling around inside there. I've saving to fix that because I did not see it as an urgent problem. I'm guessing it's probably going to be the best place to start, and then move on to the pressure gauge if that doesn't work. Sorry I didn't mention this sooner but I didn't think that it could cause enough restriction to actually stall the engine.
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Hammer Time
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Jul 28, 2009, 11:14 AM
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Re: 2000 GMC Jimmy
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They can get plugged so bad the truck won't even move. Yes, that's a good place to start. They don't always get restricted when they break up but they do sometimes. I have a 98 Blazer with 85K and I just had to do mine. The exhaust shop should be able to replace that for around $200.
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zanej
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Jul 28, 2009, 11:18 AM
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Re: 2000 GMC Jimmy
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Now is it possible that the loose parts could be restricted sometimes but not others. Recently it started and ran just fine, yet a few hours later, would not run?
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Hammer Time
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Jul 28, 2009, 11:21 AM
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Re: 2000 GMC Jimmy
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Converter restriction always gets worse the longer the engine is running.
If it's a sharp, crisp shut down, the coil can act that way. The converter will be a smooth loss of power.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jul 28, 2009, 11:23 AM)
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zanej
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Jul 28, 2009, 11:24 AM
Post #12 of 13
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Re: 2000 GMC Jimmy
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Alright well I think I've taken up about enough of your time for the day. Thanks for all the information. Have a good one.
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Hammer Time
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Jul 28, 2009, 11:30 AM
Post #13 of 13
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Re: 2000 GMC Jimmy
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Post back when you have tested some things or have more info
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