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07-05-2008, 05:29 PM
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#1 | |
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AF Newbie
Join Date: Jul 2008
Location: Lakeland, Florida
Posts: 3
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1999 4.8L Sierra sluggish Backfiring
Hey to all, my problem is my 99 1500 Sierra idles fine runs ok if you don't press to hard on the pedal after which it will start backfiring, If you let off just a little it stops backfiring but has no power, RPM's go down to below 600, You basically have to pull off the road shut it off give it a moment and crank it up and go on, just dont press to hard on the gas petal. Cat's have been replaced,fuel pump replaced and filter, plugs replaced. There is no distributor on this engine. Does anyone have any ideas ????
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07-05-2008, 06:26 PM
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#2 | |
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A990 racer
 Join Date: Mar 2002
Location: Chestertown, New York
Posts: 17,052
Thanks: 26
Thanked 383 Times in 374 Posts
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Re: 1999 4.8L Sierra sluggish Backfiring
Welcome to AF, check fuel pressure when the engine is loaded as you describe.
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07-08-2008, 09:09 PM
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#3 | |
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AF Newbie
Thread starter
Join Date: Jul 2008
Location: Lakeland, Florida
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Re: 1999 4.8L Sierra sluggish Backfiring
Hey again, I checked the fuel pressure this evening and while the engine was under load the gauge would read about 35 psi, while the engine was at idle the gauge would read 42 psi, with the engine off and key on the gauge would read 52 psi. My book says I should read with the engine off and key on, 55 to 62 psi. any ideas guys ???????
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