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2007 5.3 Surging Tach Under Constant Throttle

Rockmaples

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Rockmaples Enthusiast

Rockmaples

Posted
Posted

please excuse the double post from a new guy, i wasn't sure if the end of the old thread i asked this question on first was still being watched.

 

Ive got a 2007 5.3 4x4 with an annoying (maybe normal) but hardly noticeable problem. Truck has 60k miles

 

at light throttle (barley enough to maintain speed) when traveling about 50mph the tach surges up and down. If I let off it stops. If I lay it on a bit it stops (it doesn't surge while accelerating). Although the tach surges up and down from about 1800-2100 it is barley felt (truck is not lurching ahead).

 

It doesn't feel like a trans thing but I am certainly no trans expert.

 

If there were any guesses on what you guys might try first I would appreciate opinions. TPS and MAF sensors SEEM to be higher on the list for these symptoms on here but there is less on the 5.3 that I can find anyway.

 

Thanks for any guesses

  • 3 months later...
Josh185 Enthusiast

Josh185

Posted
Posted
please excuse the double post from a new guy, i wasn't sure if the end of the old thread i asked this question on first was still being watched.

 

Ive got a 2007 5.3 4x4 with an annoying (maybe normal) but hardly noticeable problem. Truck has 60k miles

 

at light throttle (barley enough to maintain speed) when traveling about 50mph the tach surges up and down. If I let off it stops. If I lay it on a bit it stops (it doesn't surge while accelerating). Although the tach surges up and down from about 1800-2100 it is barley felt (truck is not lurching ahead).

 

It doesn't feel like a trans thing but I am certainly no trans expert.

 

If there were any guesses on what you guys might try first I would appreciate opinions. TPS and MAF sensors SEEM to be higher on the list for these symptoms on here but there is less on the 5.3 that I can find anyway.

 

Thanks for any guesses

 

Does your truck have active fuel management? This sounds like what active fuel management would act like.

c5streak New Member

c5streak

Posted
Posted

I have an '09 GMC 6.0 VMAX and have a very similar issue. Between 1200 & 2000 rpm I get the same light throttle surge. It has done it since it was new (28k mi). I added long tubes and high flow cats, and it got alot worse. After a tune it is back to what it was before. I've tried cleaning the TB and MAF, 93 octane, 3 diff tunes, and checking the APPS. Even had the DOD deactivated. Nothing has solved the problem. Not the trans, as it does it in any gear, TC locked or unlocked. I'm off to the dealer for an updated flash.

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