Question about 1999 GMC Jimmy

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My 1999 gmc jimmy will not start. it would loose power while driving and slow down whenever im going 60 or above at first. I got the catlac converter fixed but the problem didnt go away. i gave it a tune up and got transmission serviced. Then the radiator went out so i got that fixed. Last i tried a new fuel filter. it try to crank but no luck. What do i do from here ive put too much work into it to let it go

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Your Fuel Pump may need replaced.

Posted on Oct 19, 2010


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Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine

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My full size gmc jimmy with 305 is very sluggish when driving on highway i start to go up a hill it slows down to 45 mph or lower what could be causing this

If it's been well maintained as in tune-ups etc, and considering the year, and thinking pretty high mileage, I wouldn't rule out a plugged exhaust, such as catalytic converter. Pretty easy to test and see what results you get. They used to sell what they called,"test pipes" for this problem, which was basically a piece of exhaust pipe that allowed you to remove converter and install it in it's place to test it. Problem was, everybody just left the test pipe in if it was the cure, thus not helping the environment, so they're no longer available, except maybe from a custom exhaust place. Other signs of plugged exhaust include, engine running hotter than normal, poor fuel mileage. If it is plugged, don't let it go, can also cause head gasket problems, so make sure coolant isn't going down as well.

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Possible transmission problem

It may be the lock up converter, visit for free complete information about any repair including how much it should cost.

Mar 01, 2010 | 1996 GMC Jimmy

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Will not start after driving 1997 gmc jimmy

Sounds like you want to check for a vacuum leak at the intake manifold gaskets. This can easily be done with a can of WD-40. Spray the oil around the gasket areas, and, on all vacuum lines.P.S. do this with the engine running. I'm sure you'll hear a stumble or slowing of the engine, if you do concentrate the spray until you're able to pinpoint the leak. Thanks, Dana

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Jimmy looses power

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1 Answer

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That's normal in most cases, depending how low it goes. 40 psi approx when driving, 20 psi approx when idling ?

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