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Old November 29th, 2010, 11:47 PM   #1
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Default 88 GMC Jimmy sputtering, lunging, and cutting out problem

I am having a problem similar to Nissan240-sx but I didn't want to hijack his thread so here goes.

Below is a video showing the problem. In the video I go from idle to quickly pressing the throttle about 3/4 of the way down. After I do this it jumps like it wants to go (and feels like it has full power) then it cuts out for a sec and accelerates while bogging and sputtering the whole time through the entire RPM range.

I didn't mention it in the video but it's not just off idle acceleration that causes it to do this. If I gun it while moving at lets say 45MPH (or any speed really) it will kick down smoothly and rev no problem but it will still be sputtering as it revs up and will lack power.


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Old November 29th, 2010, 11:56 PM   #2
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Start with the simple things...change the fuel filter. My truck ran just like that a few years ago and it was the fuel filter.
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Old November 30th, 2010, 12:00 AM   #3
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Start with the simple things...change the fuel filter. My truck ran just like that a few years ago and it was the fuel filter.
The fuel filter was actually the first thing I thought of but then I figured that it couldn't be the problem as it doesn't do this when the engine is cold.
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Old November 30th, 2010, 12:16 AM   #4
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I would suspect something faulty in the ignition then...perhaps bad coil, ignition module, pickup coil or any other component that can be faulty when it gets hot.

Before I would go and just start buying new parts though I would just get a whole distributor and coil from a junk yard and see if that solves the problem. Probably get everything for under $50

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Old November 30th, 2010, 12:28 AM   #5
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I would suspect something faulty in the ignition then...perhaps bad coil, ignition module, pickup coil or any other component that can be faulty when it gets hot.
Hmm that actually sounds like it may be the problem. I have been concentrating on the fuel system so much I seem to have totally over looked the ignition system. BTW I know it isn't the coil because I recently installed a msd blaster 8226 coil in it. The pickup is only 10 bucks but is there a way to test the ignition module before I go out spending more money?
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Old November 30th, 2010, 01:11 AM   #6
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is there a way to test the ignition module before I go out spending more money?
Autozone will test them but the problem is when they do it they are testing it in a 70 degree store and not under the hood of your vehicle where temps are much hotter and that is usually when they fault out is when they get hot.

I had AZ test a few and they said they was good only to find out the hard way they was bad...thats why I say just buy a whole distributor from a junk yard, they can be had for cheap and that covers all your bases.

Usually though if an ignition module is bad though your vehicle wont start at all once it gets hot.
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