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One Day I Got Power...the Next I Dont...

craigtheman

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craigtheman Enthusiast

craigtheman

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Posted

i have a 2000 silverado with a 5.3. on good days the truck goes like a bad out of hell right off the line and even spins the tires. then on some days when i give it off the line the truck hardley wants to take off the line but onece it gets about 3 grand than it takes off. i also noticed that it is almost faster is i dont put the throttle all the way down to the floor. too me that is weird. i got short headers, power programed, kn intake, coolant bypass, e fans and no muffler. does that any sence to anyone??? im been trying to figuar it out but have been sh out of luck. any help would be awsome

ShoddyHog Enthusiast

ShoddyHog

Posted
Posted

This might be a far fetched SWAG, but here it goes.

 

I know on some ECMs, fueling is accomplished below a certain RPM with a blend of MAF and VE tables used. Once you exceed that RPM, you're running purely off of the MAF.

 

Since the VE calculations are MAP sensor dependant, if your MAP sensor was intermittenly screwing up, it might cause what you're describing. I'd think that it should throw a code for the MAP if it was malfunctioning though.

craigtheman Enthusiast

craigtheman

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Posted

yeah i was thinkn it was that damn programmer i will pull it and give that a try.also i see what u mean but my truck hasn't throwen a code since the knock sensor was bad a few years back. thanks for the help guys. i will let everyone know what happenes

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