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#1
04-07-2008, 03:54 PM
Elcova Rookie
Join Date: Apr 2008
Posts: 5
Check engine light on - now what?
Need some help. I have a 2008 H3 3.7L H3 with 2K miles that I had a K&N air filter system and catback exhaust system installed. Now I have the check engine light on, the engine is sputtering and on star diagnostics says the engine is running too lean. Now what should I do? Are there other adjustments I need to have done. Don't want to burn up the engine. Thanks for any help.
#2
04-07-2008, 08:48 PM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Check engine light on - now what?
Make sure there are no leaks after the mass air flow sensor to the throttle body. This will cause it to run lean as more air than the maf sees is getting in the intake. Also make sure the MAF is not contaminated with the oil from the air filter, this will cause the sensor readings to be out of whack.
#3
04-08-2008, 03:04 AM
Hummer Veteran
Join Date: Apr 2007
Posts: 221
Re: Check engine light on - now what?
How long have you had the stuff on there... you didn't specify. Did it start doing this right away. If so, it sounds like a vacuum leak. Cat-back is not the problem.
#4
04-08-2008, 03:30 AM
Hummer Veteran
Join Date: Dec 2007
Location: somewhere
Posts: 164
Re: Check engine light on - now what?
sputtering ....... humm sounds like a misfire. which in return can set lean codes........ really i need more info please.........
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#5
04-08-2008, 03:51 AM
Elcova Rookie
Join Date: Apr 2008
Posts: 5
Re: Check engine light on - now what?
Drove about 150 miles after installation of K&N and catback exhaust. Drove good one day, filled up tank and went home. Next day was hard to start and would run but rough. Does that help.
#7
04-08-2008, 04:51 PM
Hummer Guru
Join Date: Jul 2006
Location: Stouts Creek
Posts: 4,192
Re: Check engine light on - now what?
Check all your intake connections. It will take a few restarts to reset. Does sound like a fresh air leak to your sensor...
If it does not clear put stock back on. Return K&N for defect
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#8
04-09-2008, 01:05 AM
Hummer Veteran
Join Date: Apr 2007
Posts: 221
Re: Check engine light on - now what?
Does disconnecting the battery for a while reset the 'puter or something??
#9
04-10-2008, 01:18 AM
Elcova Rookie
Join Date: Apr 2008
Posts: 5
Re: Check engine light on - now what?
Turned out to be a loose intake hose - thanks for all the advice.
#10
04-10-2008, 02:59 AM
Hummer Veteran
Join Date: Apr 2007
Posts: 221
Re: Check engine light on - now what?
Great! I love it when it turns out to be something simple. One time, I forget what I was doing (muth mirrors, I think) and I buttoned everything up. Went to start the H3 and nothing. It was showing the passlock symbol. I messed with everything for a couple hours. Turns out I forgot to plug one of the connections back together behind the passenger kick panel. Ha! I was happy the rest of the day for no apparent reason.
#11
04-13-2008, 05:46 PM
Hummer Guru
Join Date: Dec 2005
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Posts: 5,485
Re: Check engine light on - now what?
If I had that problem for a couple of hours a 44mag FMJ would solve the problem...
when i was 21 i had a problem with a 57 ford wagon with a 6 cyl...the 44 DID SOLVE THAT PROBLEM
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#12
04-13-2008, 09:03 PM
Hummer Professional
Join Date: Sep 2006
Posts: 497
Re: Check engine light on - now what?
Isn't that what they call throwing out the baby with the bathwater.Quote:
Originally Posted by RubHer Yellow Ducky
If I had that problem for a couple of hours a 44mag FMJ would solve the problem...
when i was 21 i had a problem with a 57 ford wagon with a 6 cyl...the 44 DID SOLVE THAT PROBLEM
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#13
04-13-2008, 09:31 PM
Elcova Rookie
Join Date: Apr 2008
Posts: 5
Re: Check engine light on - now what?
Yea -don't know where the 44 mag response came from. Only cause more problems
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