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08-01-2007, 01:48 PM
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Hummer Veteran
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Join Date: Dec 2006
Posts: 115
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rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
I have an o3 h2 with 80 g miles on it . I am having some issues with truck surging in low rpms. Right around 12 to 1500 rpms it starts to bounce up and down. you can feel it terribly. I had a stage 2 jet chip in at one time time and thats when i started to notice it .. ( never notice a power difference with chip in). SO i took chip out and its still doing it!
Its gets better if i run 93 octane. I was wonder if the truck is not liking all the ethonal in this new so called gas our stores are selling??
Anybody have this problem???
ALso what kind of tune up should i do at 80,000 miles??
thanks
Andy
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08-01-2007, 04:56 PM
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Hummer Expert
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Join Date: Oct 2005
Location: MARYLAND
Posts: 779
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
there is a recomended fuel service at about 75k i think
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08-01-2007, 05:55 PM
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Hummer Guru
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Join Date: Jan 2004
Posts: 7,060
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
You are due for a tune! Your injecters being dirty may have something to so with it. My 03 did this. I paid the dealer for the very expenses service, ut all was better when they were done.
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TAIL RATED!
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08-09-2007, 07:05 PM
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Hummer Veteran
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Join Date: Dec 2006
Posts: 115
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
i changed the fuel filter and i am running 93 ans it still does the surging!
I CLEANED THE INJECTORS AS WELL!
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08-09-2007, 07:16 PM
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Hummer Authority
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Join Date: Oct 2004
Location: Houston, TX
Posts: 1,290
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
Quote:
Originally Posted by amstaffbair
I CLEANED THE INJECTORS AS WELL!
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You cleaned them, or had a mechanic clean them?
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08-09-2007, 07:27 PM
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Hummer Veteran
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Join Date: Dec 2006
Posts: 115
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
well what i meant i used sea foam and some fuel injector cleaner!!
sorry fellas!
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08-09-2007, 07:54 PM
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Hummer Novice
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Join Date: Jul 2005
Location: Beaumont, TX
Posts: 20
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
i've had this same problem for a while now...i've done and changed everything i can possibly do and still not fixed. going to look at new cars today.
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08-09-2007, 09:44 PM
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Hummer Expert
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Join Date: May 2007
Location: PHOENIX AZ
Posts: 681
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
Try this, change your fuel filter,check your air filter and replace if dirty,if you have a K&N make sure you do not over oil it ,remove all the spark plugs and get a can od GM top engine cleanrt from your local Chevy dealer and use a funnel and a piece of rubber hose and pour it in all cylinders let it sit over night than spin the engine over a few times to force out the remaining fluid ,replace the plugs with new NGK or AC delco plugs of the proper heat range and inspect the plug wires and replace if needed new wires are always a nice touch on a tune up . put in 2 cans of seafoam with a full tank of premium fuel , give the throtle body butterfly a few shots of carb cleaner (both sides open it )to remove some carbon (don't over do it ) start your truck and watch as it smokes like a train .than after 15 min go and drive it like you stole it . after you get down to a 1/4 tank change your oil. you may also want to clean your MAF with some eletrical parts cleaner spray . and don't forget to use anti seize compound on the plug threads (just a very light thin coat ). if that does not cure it you ether have a suspect MAF and you should get it tested B4 you replace it . if you have a MIL (CHECK ENGINE LIGHT ON) SCAN AND READ THE CODE FIRST b4 DOING ANYTHING GOOD LUCK . AND CALL OUT THE OLD GIRL AND LET HER WATCH THE SMOKE SHOW . GOOD LUCK . SOME TIMES A BAD INTAKE MANIFOLD GASKET WILL BE THE CULPRIT .
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Last edited by IRA51 : 08-10-2007 at 12:53 AM.
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08-09-2007, 10:06 PM
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Elcova Rookie
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Join Date: Apr 2007
Location: West Palm Beach
Posts: 5
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
You aren't by chance trying to run E85 in it are you? That would definitely mess things up.
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08-24-2007, 03:50 AM
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Hummer Veteran
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Join Date: Dec 2006
Posts: 115
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
just an update! i cleaned my throttle body and cleaned my mass air...
All is good !!!!!  No surging and a much better idle!!!
thanks for the help!!!
andy
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08-25-2007, 01:53 AM
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Hummer Novice
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Join Date: Mar 2007
Posts: 14
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
I did the same and the surging is now gone too...
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02-21-2010, 03:27 AM
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Hummer Veteran
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Join Date: Jan 2007
Posts: 167
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
Mine did it tonight.
Old threat but a great one.
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02-23-2010, 08:43 PM
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Hummer Professional
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Join Date: Aug 2005
Location: Dallas, Texas
Posts: 314
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
What did you clean your throttle body and mass air with ?
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Pimpin 8 E Z but somebodys gotta do it .
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02-24-2010, 04:04 AM
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Hummer Veteran
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Join Date: Jan 2007
Posts: 167
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
Quote:
Originally Posted by Lucky1
What did you clean your throttle body and mass air with ?
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I used Carb cleaner for the throttle body, engine off, not a lot but a spray around the butterfly and wiped it down. Opened the butterfly as well since it is an electric motor... just be slow and easy with it. Don't use a lot of spray, less is more.
I had some MAF cleaner I picked up at Autozone. Do not touch the MAF inside, just spray it.
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02-25-2010, 11:58 AM
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Hummer Professional
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Join Date: Aug 2005
Location: Dallas, Texas
Posts: 314
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
Thanks Xotik. My truck is running perfect but you never know when that might change.
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Pimpin 8 E Z but somebodys gotta do it .
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02-27-2010, 11:07 PM
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Hummer Veteran
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Join Date: Jan 2007
Posts: 167
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
Took it out for weekend drive today and it's still did it 2 times. It completely went away when it got to normal operating temp.
Any other idea's?
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02-28-2010, 12:42 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
If it is surging on cold starts and goes away or gets better as it warms up you may have an intake gasket leak. This will usually set lean codes butnot always. Try starting it cold and spray carb cleaner at the intake ports where they mate to the cylinder heads, if the rpm fluctuates the gaskets are leaking. Easier to see if you can monitor fuel trim levels on a scan tool while doing this test.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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03-03-2010, 03:16 AM
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Hummer Veteran
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Join Date: Jan 2007
Posts: 167
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
I drove it to work Monday and it does it evern when warm, 1500 to 1800 RPM jumps between them with no change in pedal pressure. I took the throttle body off and cleaned it VERY well Monday evening. Drove to work today... no difference. A leaking manifold would throw a lean code and there are no codes.
Could the throttle body electric motor be causing it? Looking for idea's.
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03-03-2010, 08:55 PM
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Hummer Professional
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Join Date: Feb 2003
Location: Palm Desert, CA
Posts: 470
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
I had this same problem and it turned out to be crappy fuel...try putting some Techron additive in the tank and switch to Chevron, Mobil or shell that have the additives in them. It may take a tank or two to correct the problem. It's worth a try.
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Y2K Corvette Millennium Yellow Convert/Blk/Blk, B&B headers, B&B Tri-Flo\'s, H-Tech MAG,GMS MAF, RM Racing TwinFlow.
1994 Chev Suburban Blown
1970 Trans Am balanced, blueprinted, ceramic headers, etc.
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03-06-2010, 12:44 AM
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Hummer Authority
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Join Date: Sep 2003
Location: Canada
Posts: 1,251
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Re: rpm's surging at around 30-50 mph! HELP, Is it the Shi@Ty GAS!
could be torque converter clutch coming on and off. What speed are you driving? Not likely to be the throttle body, could be though.
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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