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GMC Forum: 1999 Sierra Wont go over 2k RPM
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  #1  
Old 03-09-2020, 05:49 PM
daytonb daytonb is offline
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Exclamation 1999 Sierra Wont go over 2k RPM

Hey guys,

I own a 1999 GMC Sierra 2500 SLE with 135k miles. Recently the battery went bad and I had to replace it. Ever since replacing the battery I will randomly not be able to go past 2k RPMs and will bog down on hills. After leaving it for a few days it seemed to run fine and got well into the 5k RPM however the next day the problem came back.

There is no check engine light and it starts up immediately. I am unsure if it is a fuel filter/pump or something more serious.

As a note, I added a Flowmaster exhaust on it 4 months ago with no problems. I also checked the fuel pump fuses and all seemed to be O.K.

Any help would be greatly appreciated as I dont want to take it to a shop and get the run around.
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  #2  
Old 03-09-2020, 06:51 PM
98trck 98trck is offline
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My first thought is a clogged Catalytic converter
But I think that would be all the time limited rpm
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  #3  
Old 03-09-2020, 06:56 PM
98trck 98trck is offline
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Here is a shot in the dark
Gas tank vent system not working
Next time it does it take the gas cap
off for a moment
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Old 03-09-2020, 07:28 PM
daytonb daytonb is offline
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Unfortunately, I just went and checked, while there was a little pressure released when I took off the gas cap the problem did not go away.

It will get up to 2k RPM and shift through gears at 2k. However, if I attempt to push it over 2k RPMS it bogs down to 1.5k and struggles. Going up small hills it will have a very difficult time.
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Old 03-10-2020, 09:38 PM
98trck 98trck is offline
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have you taken your truck to a local auto parts store and have them scan it?
I have seen pending diagnostic codes when scanned that don't produce an SES light
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Old 03-11-2020, 02:31 PM
daytonb daytonb is offline
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So I havent taken it anywhere to be tested, however I do own a OBD II sensor and no codes came up. I checked the cats with a thermal temperature gauge and they seemed to be working good, being 100 degrees hotter at the outfeed. I'm guessing it might be a bad fuel filter/ fuel pump.
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  #7  
Old 03-29-2020, 06:09 PM
98trck 98trck is offline
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is that the correct temperature pattern for a cat'd exhaust system
use the temperature gauge on a vehicle that is running good to compare temp readings to your truck
PETE
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