What causes 91 GMC 6 cylinder to loose power? - Team Camaro Tech
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post #1 of 4 (permalink) Old Aug 30th, 12, 09:02 PM Thread Starter
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Wayne
 
Join Date: Apr 2006
Location: Oklahoma
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What causes 91 GMC 6 cylinder to loose power?

I just bought and old half ton pickup with the V6 and 5 speed manual. 109K miles. It had been setting a while. It was on empty so I went to a station and put in a few gallons to make sure the gauge worked and have enough fuel to get home. It was running good for 3 or 4 miles and suddenly it started to cut out and lose power. I mean it cut out a lot. I drove about a mile and found a place to stop and check it out. I looked at the filter underneath and it looked like it may never have been changed. I installed a new one. The old one was stopped up. However it didn't make any difference. It doesn't back fire but it acts like it is only hitting on a few cylinders every now and then. It just barely would go up a hill. By the time I got home it would just barely run in 1st gear.

So, how can I tell if it is the fuel pump, spark or what? I had a 90 GMC, same engine, that wouldn't idle and it turned out to be a split rubber fuel pump hose inside the fuel tank.

Thanks, Wayne
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post #2 of 4 (permalink) Old Aug 30th, 12, 09:15 PM
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Steps
 
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Re: What causes 91 GMC 6 cylinder to loose power?

Yeah seems a gdamn good flush and service needed
Often over looked and mis diagonised is the simple stuff.
Check out the inlet manifold... thes EGR engine are notoruous to have carbon build build up inside....good clean and good to go.

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post #3 of 4 (permalink) Old Sep 1st, 12, 05:37 AM
DT
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Donny
 
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Re: What causes 91 GMC 6 cylinder to loose power?

I would start with a good tune up. Plugs, wires, gas filter etc... If that air filter was that dirty, that is a good indication the truck was not maintained well.

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post #4 of 4 (permalink) Old Sep 6th, 12, 01:23 PM Thread Starter
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Wayne
 
Join Date: Apr 2006
Location: Oklahoma
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Re: What causes 91 GMC 6 cylinder to loose power?

I finally got to do some checking things out. I took the IN direction side of the fuel filter loose and watched as a helper turned the key on but not to turn the engine over. I could hear the fuel pump for a few seconds and fuel dribbled out. I used compressed air and blew back into the tank. Then fuel came out but not much pressure. It would spray out with my finger very lightly over the end of the fuel line. I'm guessing that the fuel pump is either bad or there is a lot of debris clogging the pump up. I did drive it a short distance and it it was way better.

Any thoughts?
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