Hesitation from take-off

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Hesitation from take-off

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Hesitation from take-off - 6/29/2008 8:13:27 PM

josh1899

Posts: 247
Joined: 11/11/2007
From: Spring, Tx
Status: offline

O.k. Another over heating issue/question. I had my radiator cleaned, and the problem persists. In stop and go traffic, my temp needle begins to climb, and eventually rests right above the 3/4 mark. The truck becomes EXTREMELY sluggish off the line and at part throttle. I''m assuming it''s pulling timing because it is getting hot. The only problem is it almost got me killed today when I was trying to turn into a parking lot from the middle lane(across oncoming traffic). Pressed gas, started to turn, and the truck fell flat on its face. press gas a little harder, hardly moving. Stomped gas while yelling expletives as oncoming traffic starts to get REAL close, and the truck finally starts building speed. This is getting stupid. What is it? Any ideas? Truck cant be running that hot as to pull timing to the point of almost stalling. Transmission shifts fine. No warning lights. Almost like the tranny is starting in 2nd or 3rd gear. I''m going to call the dealer, and take it in tomorrow, but I wanted to get yall''s opinion first. Seems I cant shake my damn flooding incident, stuff seems to keep popping up down the line. I just paid $400 at dealership to have the radiator pulled and cleaned, because they said hats what was causing the running hot before. Do you think its the Tranny? The Engine?

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2008 Hummer H3 Alpha. Graphite Metallic/Light Cashmere. Power Sunroof, Draw-tite Hitch, Window Tint, Weathertech mats, All Royal Purple fluids, Underbody Protection, 33" Firestone Destination MT's, Cognitos, Rocky Road Sliders.

Post #: 1

RE: Hesitation from take-off - 6/29/2008 8:42:15 PM

Forney

Posts: 39
Joined: 10/17/2007
Status: offline

Have you tried to run a different coolant? watch out ''cause some aren''t anti-freeze too but try to find a high performance coolant that still has anti-freeze

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Post #: 2

RE: Hesitation from take-off - 6/29/2008 8:48:58 PM

3hummers

Posts: 11822
Joined: 9/23/2007
Status: offline

Josh, don''t know what all they have done but I assume fuel, air filters changed, thermostat, etc. You say they charged $400.00 to flush the radiator I would tell them that since they misdiagnosed it the next one is on them. They are the professionals and you don''t pay them to guess. Who is your dealer?

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Post #: 3

RE: Hesitation from take-off - 6/29/2008 9:01:05 PM

josh1899

Posts: 247
Joined: 11/11/2007
From: Spring, Tx
Status: offline

DeMontrond Hummer in Houston, Tx. The air cleaner is perfect. They already replaced the evaporaitve canister in the fuel tank. I changed the diff. fluids and oil. They cleaned the radiator, and I have since pulled off the grill myself and rinsed it again thoroughly. I really don''t know. I understand that maybe the H3''s run a little hot, but this doesn''t seem right. The temp will fall to slightly above mid point when on the freeway, but the sluggishness returns at next red light. Once underway, eveything is fine. At low speeds, like going from stop sign to stop sign in a neighborhood, the truck is an absolute DOG when temp needle climbs. I just don''t want to go to the dealer tomorrow, and have them say "Oh, well you broke this, and now we need $500 to fix." I would appreciate any insight!

_____________________________

2008 Hummer H3 Alpha. Graphite Metallic/Light Cashmere. Power Sunroof, Draw-tite Hitch, Window Tint, Weathertech mats, All Royal Purple fluids, Underbody Protection, 33" Firestone Destination MT's, Cognitos, Rocky Road Sliders.

(in reply to 3hummers)

Post #: 4

RE: Hesitation from take-off - 6/30/2008 5:37:19 AM

JeepeaterH3

Posts: 314
Joined: 1/12/2007
Status: offline

i have the exact same issue! tried everything to resolve. im going to drain cooland and oil and replace with a better oil.. see if that works. i super cleaned my radiator. and still have issues!

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Post #: 5

RE: Hesitation from take-off - 6/30/2008 5:43:05 AM

JeepeaterH3

Posts: 314
Joined: 1/12/2007
Status: offline

quote:

ORIGINAL: josh1899

DeMontrond Hummer in Houston, Tx. The air cleaner is perfect. They already replaced the evaporaitve canister in the fuel tank. I changed the diff. fluids and oil. They cleaned the radiator, and I have since pulled off the grill myself and rinsed it again thoroughly. I really don''''t know. I understand that maybe the H3''''s run a little hot, but this doesn''''t seem right. The temp will fall to slightly above mid point when on the freeway, but the sluggishness returns at next red light. Once underway, eveything is fine. At low speeds, like going from stop sign to stop sign in a neighborhood, the truck is an absolute DOG when temp needle climbs. I just don''''t want to go to the dealer tomorrow, and have them say "Oh, well you broke this, and now we need $500 to fix." I would appreciate any insight!

same here. city traffic, never reaches max, but totters on 3/4 mark. but once up to speed. it cools down... not all the way, but it does cool. And the lack of power is extreme and you hear loud fan nouse and a long woosh sound from take off!

its really getting onl. lol. im getting an intake and pcm this week. mabye that will help? but either way. im going to figure this out!

(in reply to josh1899)

Post #: 6

RE: Hesitation from take-off - 6/30/2008 6:33:59 AM

Doc Olds

Posts: 3811
Joined: 7/11/2007
From: Boat Town USA (Michigan 48045)
Status: offline

When a GM clutch fan vehicle gets hot, like you are describing, the timing is retarded by the PCM (power makes heat) and the clutch on the fan engages to pull aif through
the radiator. When hot, the retardation of timing does significantly change performance, not to the point of stalling, but a very noticable drop off in acceleration.

I can only guess that you should have them test your thermostat?? ....and make sure you do not have more than 50% coolant to water mix (since the dealer worked on it I we assume they put the GM red antifreeze in the system).
You can also add some Redline Water Wetter to the coolant to help with any cylinder head hot spots, but it really will not lower coolant temp overall.

(in reply to JeepeaterH3)

Post #: 7

RE: Hesitation from take-off - 6/30/2008 6:54:40 AM

JeepeaterH3

Posts: 314
Joined: 1/12/2007
Status: offline

quote:

ORIGINAL: Doc Olds

When a GM clutch fan vehicle gets hot, like you are describing, the timing is retarded by the PCM (power makes heat) and the clutch on the fan engages to pull aif through
the radiator. When hot, the retardation of timing does significantly change performance, not to the point of stalling, but a very noticable drop off in acceleration.

I can only guess that you should have them test your thermostat?? ....and make sure you do not have more than 50% coolant to water mix (since the dealer worked on it I we assume they put the GM red antifreeze in the system).
You can also add some Redline Water Wetter to the coolant to help with any cylinder head hot spots, but it really will not lower coolant temp overall.

will a pcm tune fix?

(in reply to Doc Olds)

Post #: 8

RE: Hesitation from take-off - 6/30/2008 7:19:17 AM

josh1899

Posts: 247
Joined: 11/11/2007
From: Spring, Tx
Status: offline

I''ve already added Royal Purple Ice, (same type additive as Water wetter). Didn''t help. I also noticed that A/C performance drops off when this happens. The air go''s from cold w/ no humidity to cool w/more humidity. Hummer replaced my A/C compressor a few months ago. It had started to whine during acceleration. I don''t know what to do!

_____________________________

2008 Hummer H3 Alpha. Graphite Metallic/Light Cashmere. Power Sunroof, Draw-tite Hitch, Window Tint, Weathertech mats, All Royal Purple fluids, Underbody Protection, 33" Firestone Destination MT's, Cognitos, Rocky Road Sliders.

(in reply to JeepeaterH3)

Post #: 9

RE: Hesitation from take-off - 6/30/2008 7:20:33 AM

Doc Olds

Posts: 3811
Joined: 7/11/2007
From: Boat Town USA (Michigan 48045)
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I do not think so brud. For some reason your coolant temp is running a bit high, that needs to be addressed, maybe a visit to a local rediator shop for an inspection??

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Post #: 10

RE: Hesitation from take-off - 6/30/2008 12:42:57 PM

RealJeep

Posts: 725
Status: offline

A few thoughts:

Is the clutch fan functioning properly?
Does the radiator have a clean core, meaning are all vanes clear inside?
Is coolant or exhaust gas getting into the system someplace? Bad head gasket?

Have them do a compression check on all 5 cans and the radiator. Also have the clutch fan checked.

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Post #: 11

RE: Hesitation from take-off - 6/30/2008 12:47:37 PM

josh1899

Posts: 247
Joined: 11/11/2007
From: Spring, Tx
Status: offline

I took it to them today, and asked them about the clutch fan and they looked at me like I was talking greek. Radiator is clean. We''ll see what they come back with.

(in reply to RealJeep)

Post #: 12

RE: Hesitation from take-off - 6/30/2008 1:11:31 PM

Desert Dan

Posts: 145
Joined: 3/6/2007
Status: offline

Hesitation on take off?

Maybe you have the 5 cylinder engine?

Just kidding..

I hope they get it figured out and fixed ASAP!

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Desert Dan

H3 2006 Adventure/Lux/5-spd/sunroof/rock rails/underbody skids/block heater/Defender Roof Rack

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Post #: 13

RE: Hesitation from take-off - 6/30/2008 3:48:23 PM

RealJeep

Posts: 725
Status: offline

Why would they look at you like that for inquiring about your fan? It''s not an electric fan so there is only ONE way to actuate it and that''s with some thermal device that makes the fan spin faster when the need arises. I can tell the first thing in the morning when I head down the road and it sounds like my fan is blowing like a hurricane. Then it just tapers off and gets quiet as the engine warms up a little. Thus I know it''s working!

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Post #: 14

RE: Hesitation from take-off - 6/30/2008 3:55:22 PM

ChevyHighPerformance

Posts: 159
Joined: 7/5/2006
Status: offline

Here is the timing adder table vs engine coolant temperature for your 08 Alpha. This timing gets added to the normal timing. So at high temperatures a negative means timing is reduced.

When above 212F, you lose some significant timing.