5.3 Question
10-08-2003, 08:37 PM
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Staging Lane
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5.3 Question
I have been having a problem I think with my truck for a while, and was wondering if someone else had the same thing. My truck is an '01 Sierra sbsc with a 5.3 auto. When I am on my truck at WOT it has a detonation type rattle or sound between 3800-5000 rpm. If I slightly let off the throttle it goes away. All I have done is a drop in K&N filter. I have been told that it is my injectors. If anyone has any ideas all will be appreciates. And the truck at the track only ran 15.90 doing this. 
10-08-2003, 08:46 PM
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Re: 5.3 Question
Try changing your fuel filter first.I had this problem with my hypertech tuning and wheni changed fuel filter problem was gone.Even a slightly clogged filter will cause you to run lean at wot and cause detonation.GOOD LUCK
10-08-2003, 08:55 PM
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Re: 5.3 Question
I have already done that. It has been doing it since 35,000 miles and it has 108,000 now. Thanks for the advice
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