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07-18-2011, 03:56 PM
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Hummer Professional
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Join Date: Nov 2009
Location: Windermere, FL
Posts: 297
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Surging Between 45-50 MPH
Lately I've been getting an inconsistent surging in my RPM's when cruising between 45-50 MPH. I can visibly see the tach needle jump. It usually does this when I first take the truck out, and then basically goes away. Took it to the dealer and they did the injector cleaning, etc., but I'm still getting the problem. They suggested that it could be the transmission, but wanted to look at some cheaper fixes first.
Any ideas?
Thanks,
Charles
__________________
White 2005 SUT, Lifted 7.5" via Fabtech/custom work, Fabtech Dirt Logic 2.25 shocks, 40x15.5x22 Toyo's, black 22" Fuel wheels, 4.88 gears, Dynatech long tube headers, Magnaflow exhaust, Air-raid intake, Superchips programmer, Edlebrock panhard bar, Cognito UCA's, Kryptonite tie rods, Cognito pitman/idlar arm gussets, Hotchkis swaybars and trailing arms, Amp Research steps, E&G fender flares, PIAA SMR's, smoked roof lights (bulbs removed), black suede headliner, 13" JL's under seat
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07-19-2011, 03:30 AM
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Hummer Expert
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Join Date: Jan 2006
Location: chicago
Posts: 724
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Re: Surging Between 45-50 MPH
Quote:
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Originally Posted by charles06
Lately I've been getting an inconsistent surging in my RPM's when cruising between 45-50 MPH. I can visibly see the tach needle jump. It usually does this when I first take the truck out, and then basically goes away. Took it to the dealer and they did the injector cleaning, etc., but I'm still getting the problem. They suggested that it could be the transmission, but wanted to look at some cheaper fixes first.
Any ideas?
Thanks,
Charles
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possible that its signs of your fuel pump going bad... anyone else want to chime in on this?
__________________
2003 H2 Lux Series. Murdered Out! 20x10 Eagle Wrapped with Nitto Mud Grapplers 35x12.5x20 Full tint including windshield, full LED interior, K&N Intake, HID Headlights & Fogs, Plasti Dip Skid plate & front/back Lower Bumpers, List goes on!
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07-19-2011, 08:02 AM
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Hummer Veteran
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Join Date: Nov 2009
Location: Miami Fl.
Posts: 136
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Re: Surging Between 45-50 MPH
Mass Air Flow
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07-19-2011, 12:37 PM
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Hummer Veteran
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Join Date: Oct 2009
Location: Washington
Posts: 147
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Re: Surging Between 45-50 MPH
Throttle body dirty, Butterfly getting stuck open. Just a guess like the others.
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07-19-2011, 01:18 PM
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Hummer Professional
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Join Date: Nov 2009
Location: Windermere, FL
Posts: 297
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Re: Surging Between 45-50 MPH
I appreciate the help everyone.
The problem we're having diagnosing it is that it's intermitent. I can't get it to happen when I'm at the dealer...of course. Like I stated earler, the dealer did the injector cleaning and all that crap. I'll ask if they scrubbed out the throttle body.
__________________
White 2005 SUT, Lifted 7.5" via Fabtech/custom work, Fabtech Dirt Logic 2.25 shocks, 40x15.5x22 Toyo's, black 22" Fuel wheels, 4.88 gears, Dynatech long tube headers, Magnaflow exhaust, Air-raid intake, Superchips programmer, Edlebrock panhard bar, Cognito UCA's, Kryptonite tie rods, Cognito pitman/idlar arm gussets, Hotchkis swaybars and trailing arms, Amp Research steps, E&G fender flares, PIAA SMR's, smoked roof lights (bulbs removed), black suede headliner, 13" JL's under seat
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07-22-2011, 02:41 AM
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Hummer Authority
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Join Date: Dec 2003
Location: New Braunfels/Canyon Lake, TX
Posts: 1,357
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Re: Surging Between 45-50 MPH
Please post if you find a fix. Mine does this at idle - not every time, just every now and then. Usually after I run it for a bit, shut it off, then restart 30-60 mins later. It will surge until I give it gas, then it's fine. Can't duplicate it at the dealer either!
Stacy
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2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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