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#1
05-18-2009, 12:07 AM
Hummer Veteran
Join Date: Jan 2009
Location: Maine
Posts: 103
H2 Bang on Cold Startup?
I've noticed now a couple of times, when I go out to start the H2, it makes a bang sound from the engine compartment.....only does this on the first cold start up. It's not a rattle or a tap...
It's when you turn the key, almost as though I'm not holding it long enough...???? Or, like the engine didn't shut off right....and gets back in sync when started.
Very hard to describe....but I remember my 05' did it a couple of times......anyone know what it is?
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2007 Hummer H2
2010 Jeep Rubicon
#2
05-19-2009, 03:17 AM
Hummer Veteran
Join Date: Jul 2005
Location: Baton Rouge
Posts: 105
Re: H2 Bang on Cold Startup?
I had that happen as well. The truck seemed like it would almost lunge with a noise from the engine/drivetrain. Never checked it out, but since I changed the T-Case fluid (Royal Purple) it hasn't happened since (T-Case fluid was 65k old). Not sure if it's just coincidence or not. Been a few months.
#3
04-13-2011, 01:49 PM
Hummer Veteran
Join Date: Jun 2009
Location: Germany
Posts: 215
Re: H2 Bang on Cold Startup?
OLD POST
Anybody know what could cause this?
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Cognito UCA - Leveling Kit - Kryptonit Tie Rods - Bilstein Shocks - Cognito Support Kit - 37X12.5 Cooper Tires - Pro Comp 8128- Mercury Balancers
#4
04-22-2011, 03:10 AM
Hummer Professional
Join Date: Nov 2009
Location: Windermere, FL
Posts: 297
Re: H2 Bang on Cold Startup?
No idea, but I get it, too. Anyone?
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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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