Hummer H2 idle surging

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Oct 7, 2019 | 01:16 PM

#41

myrddin

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Joined: Jun 2010

Posts: 282

Quote:

Originally Posted by MixManSC

Cold air intake or air filter lid off while doing that? With a cold air intake you can generally hear a quick noise when you goose the throttle which it the intake suddenly sucking in a massive amount of air in a hurry. You can hear it a tiny bit with the stock air tube (big tube between the throttle body and the filter box) as well but the baffles in the stock air tube muffles that very well. On the stock tube, without the lid on the air filter box you can hear it a bit better or if testing without the air tube (not going to run well though since the MAF is on the air tube by the filter box). Aftermarket air tubes flow a little more freely and do not have the baffles in them to quiet that down. That does sound like it is sucking air in to me which is normal.

All stock, and all the parts are on and tight. I know it’s normal for the motor to suck in a bunch of air... I think I’m just paranoid. I’ll look it over one more time and then if it’s still ok I’ll drive it for a while and take another peek. Before today the idle surged up and down all the time. Or if not continuously, I could get it to happen by giving it gas.

Oct 7, 2019 | 01:22 PM

#42

myrddin

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Senior Member

Joined: Jun 2010

Posts: 282

Quote:

Originally Posted by Sam!

Sounds way better than you first surging video, Oh yeah and i saw your driveshaft play video, which happens to be a same issue mine has and that amount of play is excessive therefore i am going to rebuild the transfercase before adding a new seal. chain has way to much play. and possibly a bearing in there too.

Sam, I’m also going to rebuild or replace. My seal actually fell out after I replaced it... and I lost a lot of fluid as well. It looks like the seal must have been damaged on install or was defective... I’m waiting on an old stock part (original) it’s the output shaft seal with no metal lip... I think it is a better part. Once I get it, I’ll toss it on and fill it up. Rebuild coming... I’m wondering if that is a job I can do... or if I need to send it out. Reman is like 1200-1600 bucks

I saw a rebuild kit for like 400.... it’s been an odd week for my H2... it’s super nice besides a few surprises that popped up. I’ll sort it out though.

Oct 7, 2019 | 03:40 PM

#43

hummerz

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Joined: Jul 2012

Posts: 8,999

From: C-Town

Quote:

Originally Posted by myrddin

Ok folks. I decided to take the day off to fool with the H2. For the heck of it I kept the TPS on just to text and also replaced the TB seal as well. I have had it idling for an hour and I am currently unable to get the surging idle to happen. I can’t drive it because I’m replacing the transfer case output shaft seal too... the drive shaft is out (waiting on the seal to show up). But I notice something that I don’t remember before... if I stomp it s bit (give it a lot of gas) I can hear a surging noise... has a very slight delay but reeves good... and it drops to idle just fine. If I accelerate slow or normal there is no surge and all seems fine. I just want to see if one of you folks could romp on the gas peddle a few times with the hood up (open) to see if it sounds like my video. I think I am paranoid at this point.

I guess ill keep things as is fir now, I’m wondering if the TB seal helped or if for some reason the TPS did. I half way want to swap the TPS back to see if I can reproduce. But I’m also getting tiered of working on it too.

Thoughts?

Check this video out... listen to the surge when I romp it.
https://youtu.be/NarJl0kOrpw

Sounds good to me. Leave it alone and get that seal properly secured. In the meantime make sure you save all the old parts for future if needed. When you're back on the road, use the seafoam induction cleaner, more seafoam in the tank and top tier fuel(use a high octane) then drive it down the highway like a bat out of hell.

Oct 7, 2019 | 04:27 PM

#44

bronxteck

Senior Member

Joined: Apr 2019

Posts: 3,192

From: BX NY North East

my neighbors would kill me if i used seafoam through my intake. the cloud it produces is crazy. they would probably call the EPA on me.

Oct 7, 2019 | 08:14 PM

#45

hummerz

Senior Member

Joined: Jul 2012

Posts: 8,999

From: C-Town

Quote:

Originally Posted by bronxteck

my neighbors would kill me if i used seafoam through my intake. the cloud it produces is crazy. they would probably call the EPA on me.

The carbon release can be intense. I have always injected cleaner through a vacuum port, and you can smell the catalyst burning the carbon. I have serviced many vehicles that would smoke out the surroundings. That's why I recommend to drive away and spread the carbon around.

Oct 7, 2019 | 09:12 PM

#46

myrddin

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Senior Member

Joined: Jun 2010

Posts: 282

I ordered the seafoam spray (the one with the straw). Once it gets here I’ll knock it out. I’m not worried about the neighbors.

Oct 11, 2019 | 02:52 PM

#47

myrddin

Thread Starter

Senior Member

Joined: Jun 2010

Posts: 282

I just fogged the engine through the TB like in the video above. I got it up to temp. Shut it off. Removed the air intake and fished the straw with elbow in. Put air intake back on TB. And had someone keep the tac on 2k while I sprayed. I didn’t get any smoke from the exhaust at all (at least not that I could see). Once the can was empty I had my helper shut it down. I removed the air intake, and straw and elbow. I put the air intake back on and let it sit for 10-15 min. Then I started it up and still no smoke. I drove it for 15 min or so and parked it.

I have done similar before and usually there is a huge cloud behind the vehicle while spraying. So I’m kind of puzzled. I bought two cans. I may try it again... or I might change the oil and drive it as is, then once I change the oil the next time, I’ll spray it agIn.

Thoughts?