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Power Loss on a 2000 5.3l Sierra

Power Loss on a 2000 5.3l Sierra

Postby SierraTime [OP] » Jan 15 2020, 7:51pm

I have a 2000 GMC Sierra 1500 SLT with a 5.3l that has about half the factory horsepower. It's been like this for many years. The truck has been regularly maintained but has been used as a car hauler and snowplow Truck. It has just over 200K miles on it. I recently replaced the intake manifold gaskets and found a lot of carbon buildup in the block and intake. I am guessing that the carbon is probably a majority of the problem. I ran seafoam through the intake and in the tank, I also ran BG44k through it, which helped while it was in it.
The engine also likes to surge while in 4th at 1,200rpm - 2,500rpm.
The truck runs great except for the power loss. No codes showing up and starts up every time.
I am looking for a solution to the problem without replacing the engine if possible. I am planning on rebuilding it in the future.

Right now, the only mods on the truck is a muffler delete and a K&N filter.

Any suggestions, information, and everything else pertaining to this would be great!
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Re: Power Loss on a 2000 5.3l Sierra

Postby tsuintx » Jan 15 2020, 8:06pm

Plugs, wires, O2 sensors, air filter, fuel pump/filter.
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Re: Power Loss on a 2000 5.3l Sierra

Postby CritterGitter » Jan 15 2020, 9:38pm

Tune it up and run kreen thru it... No other engine cleaner comes close.

http://www.kanolabs.com/engCle.html
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Re: Power Loss on a 2000 5.3l Sierra

Postby SierraTime [OP] » Jan 16 2020, 4:19am

I will go through it and replace those things. On the kreen, should I put it in through the vaccum line of the brake booster or just through the tank?
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Re: Power Loss on a 2000 5.3l Sierra

Postby CritterGitter » Jan 16 2020, 7:58pm

The easiest way is to put the appropriate amount in both the crankcase and the gas tank. Being as its the hardest working engine cleaner... it will work nicely doing just that. However, there have been some really good write-ups/reviews (with higher mileage engines such as yours) where the spark plugs were pulled and a turkey baster was used to apply a couple onces per cylinder directly into the combustion chamber. Then leaving the Kreen to sit in the combustion chamber overnight to do its job. The next day reinstalling the plugs and turning the engine over would produce a mass amount of smoke from the crap cleaned overnight. Its suppose to be the most dramatic way to utilize the stuff and IMO, your truck would probably be a prime candidate for this procedure.

FYI, order the stuff by the quart and not by the gallon. They charge a hazmat fee if ordered by the gallon but for some reason it does not apply when purchasing the same amount by the quart. Good Luck and keep us posted.
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Re: Power Loss on a 2000 5.3l Sierra

Postby ricka182 » Jan 16 2020, 8:03pm

+1 to Kreen. I did their full purge method, involving pulling plugs and adding to each cylinder with a 24 hour "soak", as well as well a quart in the oil, and a quart in the gas with low fuel, and a 20 minute idle. I think I may have done a quick oil change first as well, and then another once the Kreen ran through.

This was done on a 2006 5.3L with 140K+ miles, and aside from sounding better, running smoother..it got me a little over +2mpg boost, that is still with me today, about 8 months post-treatment..
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Re: Power Loss on a 2000 5.3l Sierra

Postby SierraTime [OP] » Jan 16 2020, 9:00pm

OK, I will try that method with the kreen and see what happens. I will be pulling the plugs and wires this weekend to check if they need to be replaced. I Will do fuel filter a little later, but the pump has already been replaced a few years ago. I will also be running a vacuum test to help check if one, or both, of the cats are plugged up. New o2 sensors will be in this weekend as well.
I'll let you guys know if I see any change.
Thanks for the tips!
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