Here we go again!!

[twenty2]

About a month ago, I had a issue with a Bank 1 and Bank 2 code showing my gas was lean. Do you guys think I have a gasket leak coming from my intake manifold? Or, something else? The O2 sensors were going to be changed, but they say its kinda hard to beleive that both banks would go out at the same time?

Any help please.............:crying:

[LEcustoms]

I Had the same thing happen about a month ago. I was told it was my MAF, so i cleaned it out(after market MAF) same thing happened again. I was thinking possibly the cats.I will hopefully be dropping off my truck again next week to have them look at it again. Its still under warranty. If i get the issue resolved I will let you know what the problem was with mine. Till then good luck.

[Planohummer]

do one of two things:
1)with engine running, pour bucket of water or run water hose over intake, esp at cyl heads to see if idle stumbles
2)spray carb cleaner or starting fluid around same area and see if idle raises.
either of these will point to leaking intake gaskets

[Easy Ed]

This may not apply to the H2 but.....I have a 95 Neon that I pretty much re-built mechanically as a project and to also help with the $4.00 plus a gallon gas prices we had for a while ;)

The last bit of problem I had to clear up was a code saying it was running lean. And one of the possible causes (but was not mine) for the neon to throw that code was a known problem of a cracked exhaust manifold and I do know that our H2's got a nasty habit of having the heads of the exhaust manifold bolts to break off. Maybe you have "many" of them broke and now have an exhaust leak causing the computer to throw the lean condition code.

This is just a thought and may not even be your cause but may be worth a look.

This is also the list suggested to look at in fixing the problem on the Neon

low fuel pressure
injectors
coolant temperature sensor
MAP sensor
O2 sensors
exhaust manifold
engine parts tolerance

The neon project pics are posted through out here http://s220.photobucket.com/albums/dd306/esheri/?start=40 if you got some time to kill :o

[twenty2]

I Had the same thing happen about a month ago. I was told it was my MAF, so i cleaned it out(after market MAF) same thing happened again. I was thinking possibly the cats.I will hopefully be dropping off my truck again next week to have them look at it again. Its still under warranty. If i get the issue resolved I will let you know what the problem was with mine. Till then good luck.

please let me know what happens...

[twenty2]

do one of two things:
1)with engine running, pour bucket of water or run water hose over intake, esp at cyl heads to see if idle stumbles
2)spray carb cleaner or starting fluid around same area and see if idle raises.
either of these will point to leaking intake gaskets

Ill give it a shot...

[RippSpeed]

I had issues with idle and cruising issues for awhile... I just replaced my freaking injectors and that solve my running lean issues... Then again I dont know if you guys have 80K in mileage on your rigs ????

[twenty2]

I had issues with idle and cruising issues for awhile... I just replaced my freaking injectors and that solve my running lean issues... Then again I dont know if you guys have 80K in mileage on your rigs ????

I do.... hummm, too many things to either change or check...

[HumminNBoatin']

I am having these same issues. I have 83K miles on my truck. I am VERY interested to know what the turnout is!

[twenty2]

Well, my update is here. It was my MAF sensor that had to be replaced. I drove it the whole day today, and so far no engine light on...

[HumminNBoatin']

I guess Ill go ahead and clean mine first and see if that helps.

[HumminNBoatin']

I replaced my MAF this am. Cleared the codes and gas mileage has already increased. I guess the rest of the day will tell.

[twenty2]

Son of a beotch!!! My engine light is back on, and the codes are still reading Bank 1 & bank 2 po171 and po174 lean.

The guy who replaced the MAF said on his reader, it said my MAF was bad causing the lean, but Im still having the problem!! Do you guys think this guy was taking me for a ride? Or, was he being honest and telling me he was correct on his reader saying it was the MAF sensor? And, now of course... he wants me to bring it back cause it may be the O2 sensors???

help again...

[pdsq99f4]

Son of a beotch!!! My engine light is back on, and the codes are still reading Bank 1 & bank 2 po171 and po174 lean.

The guy who replaced the MAF said on his reader, it said my MAF was bad causing the lean, but Im still having the problem!! Do you guys think this guy was taking me for a ride? Or, was he being honest and telling me he was correct on his reader saying it was the MAF sensor? And, now of course... he wants me to bring it back cause it may be the O2 sensors???

help again...

Not sure what code says "bad maf sensor". Don't bring it back to this guy. Whoever looks at it needs to check your fuel pressure (56-63psi is ok) and also check for intake leaks. Also sometimes the intake tube where it meets the throttle body gets folded under and it can pull in air from there.

[LEcustoms]

Still havent had a chance to drop off my truck. hope to get it in the shop next week. The idle is getting worse almost like I have a rediculously agressive cam. My truck has 70k on it as well.

[twenty2]

Well, Im taking it back..... I'll keep you posted on whats up next...

[Rene S. Nielsen]

Actually it might be the cat.

I had the same issue, had a code that said bad MAF (don't know the code, just got the info from the dealer) changed the MAF and still had the same code.

Then into the shop and being in Denmark where the shops don't know wery much about Hummers resulted in me changing the engine (at my own cost) because nobody cared to check the cats.

Regards
Rene

[HumminNBoatin']

Same thing Here. I am now getting the same Codes. I did have my intake tube folded at the throttle. So I pulled it off and boiled it to get it hot and expand. As it was ZERO degrees out last night. After boiling I ran it outside and it slid right on with no fold. I tightend it down and I am still have issues. I guess I will be taking it into the dealer next week.

I really do not think its the cats. Those codes are comming from before the CATS not after. I have already had my CATS replace and the codes for that fix were (System Inefficent) NOT (System Lean). I look foward to your findings. If it was Zero degrees outside I would be all over it

[HumminNBoatin']

Well I have 85K miles on my truck.

This weekend I put my truck on my father in-laws SnapOn Scanner and went throught the whole engine. I could not get it to thow a code for me while it was plugged into the truck. I went through all the injectors and checked for any history of misfires and misfires while running. So that was good news. I left my In-laws house and was getting 7.5mpg. I decided I should change my airfilter. Supposedly the air filter is rated for 100K. But I went ahead and replaced it this weekend. $60 at Autozone. Gas mileage is back up to normal. Truck is running VERY good. My old filter was pretty bad. I could even tell a weight difference when holding the new vs. the old.

Might want to check your filter.

[HumminNBoatin']

Well CE light is on again.....I give it its dealer time.

[twenty2]

UPDATE..I took it to a different shop yesterday because the original shop are idiots!!! They did a smoke check by my manifold and found it IS 100% air intake manifold leak.. I need to get my gasket changed which is causing the slight rpm flutter along with the lean codes. :beerchug:

[HumminNBoatin']

How many hour job is it??? What kind of quote did they give you?? Also where exactly is the breach?
Thanks,
Eric

[twenty2]

It was a 3 hour job. The gasket kit cost me 106.00 OEM.. All in all with labor, it ran me 427.00

[LEcustoms]

Didnt have time to go to dealer so checked the intake by the throttle body and what do you know was put on wrong. Pulled it off and re-installed it check engine light is gone and the truck is idling fine now for three days. That was my problem. Good luck to you guys.

[HumminNBoatin']

Mine went to the dealer today. Got a new Intake Manifold Gasket, Thottle Body Gasket and Injector O-Rings. Bill was $520. So far so good we will see.... I watched the mechanic do the work. I am VERY gland he talked me into the Injector O-Rings as you would not believe how much they age.

[LEcustoms]

I can imagine. The heat of the engine probably takes a toll on them.

[drewtiss@hotmail]

This may not apply to the H2 but.....I have a 95 Neon that I pretty much re-built mechanically as a project and to also help with the $4.00 plus a gallon gas prices we had for a while ;)

The last bit of problem I had to clear up was a code saying it was running lean. And one of the possible causes (but was not mine) for the neon to throw that code was a known problem of a cracked Walker Exhaust (http://www.partsandaccessories.com) manifold and I do know that our H2's got a nasty habit of having the heads of the exhaust manifold bolts to break off. Maybe you have "many" of them broke and now have an exhaust leak causing the computer to throw the lean condition code.

This is just a thought and may not even be your cause but may be worth a look.

This is also the list suggested to look at in fixing the problem on the Neon

low fuel pressure
injectors
coolant temperature sensor
MAP sensor
O2 sensors
exhaust manifold
engine parts tolerance

The neon project pics are posted through out here if you got some time to kill :o

Yep. Thanks. This was just the actual answer that I am looking for. I asked my dad about it yesterday though but your explanation is better, I guess :D

[LEcustoms]

My truck has been running fine no idle issues at all no CEL. Yesterday I was sitting at a light then all of a sudden I noticed the pitch of my exhaust change the truck started idling rough then completely shut down. I restarted it and no CEL light came on or anything. I cleaned out my MAF and checked the intake tube no issues. At a complete loss now cause the dealer probably wont be able to figure out what the heck happened with no CEL.

[HumminNBoatin']

Still no troubles here after my dealer visit a week ago....

[twenty2]

no problems here since gasket was changed...