2011 GL350 high idle?
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Senior Member
Joined: Jan 2013
Posts: 421
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2021 V167
2011 GL350 high idle?
I just towed my Airstream from Texas at 100' elevation to Colorado at 9400'. When I arrived my idle is now at about 900rpm. I have been at the high elevation for a week now with many starts and one fuel refill with no further computer adjustment to the idle.
It also idles a little rough in drive with your foot on the brake but perfectly smooth in neutral or park (or driving).
Curious if it goes back to normal when I drive back to lower elevations.
Anyone seen this? I found another thread but it went off course.
It also idles a little rough in drive with your foot on the brake but perfectly smooth in neutral or park (or driving).
Curious if it goes back to normal when I drive back to lower elevations.
Anyone seen this? I found another thread but it went off course.
Senior Member
Joined: May 2013
Posts: 437
Likes: 84
From: Espoo, Finland
2012 GL 350
Makes sense to me and brings back a memory.
Back in 1980 my dad got a wild streak and took a job in Colorado. At the time, he and my mom has a 1975 Chevy Monte Carlo and a 1975 VW Rabbit (let's not comment on their taste in cars, it hasn't gotten any better through the years with the exception of my mom's '86 Volvo wagon with 5 sp manual, which I always liked.) Anyway, my dad had a friend fab up a tow bar for the VW and we all drove out to CO from PA with the VW in tow (full of house plants if I recall correctly.) When we hit the Rockies (on the way to Grand Junction) the Chevy started running quite badly and was really struggling to get the VW up the hills.
My father had pulled over to try and figure out what was wrong and a State Trooper pulled over. After a bit of a discussion, the Trooper had us pop the hood and he flipped the lid on the air cleaner which essentially made it open to the atmosphere instead of constricted by the inlet hose. The car ran noticeably better afterwards and we made it over the mountains without any more problems.
At idle, boost levels on the engine are quite low and so you don't get the boost that you otherwise would with the engine at speed, so the computer bumps the idle to give it enough boost to keep the A/F ratio correct.
Back in 1980 my dad got a wild streak and took a job in Colorado. At the time, he and my mom has a 1975 Chevy Monte Carlo and a 1975 VW Rabbit (let's not comment on their taste in cars, it hasn't gotten any better through the years with the exception of my mom's '86 Volvo wagon with 5 sp manual, which I always liked.) Anyway, my dad had a friend fab up a tow bar for the VW and we all drove out to CO from PA with the VW in tow (full of house plants if I recall correctly.) When we hit the Rockies (on the way to Grand Junction) the Chevy started running quite badly and was really struggling to get the VW up the hills.
My father had pulled over to try and figure out what was wrong and a State Trooper pulled over. After a bit of a discussion, the Trooper had us pop the hood and he flipped the lid on the air cleaner which essentially made it open to the atmosphere instead of constricted by the inlet hose. The car ran noticeably better afterwards and we made it over the mountains without any more problems.
At idle, boost levels on the engine are quite low and so you don't get the boost that you otherwise would with the engine at speed, so the computer bumps the idle to give it enough boost to keep the A/F ratio correct.
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Joined: Nov 2009
Posts: 107
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2010 GL350
That would make sense! I just replaced my 2010 GL350's super clogged air filters after 35k miles. I noticed loud and rough idling so decided to replaced the two air filters. It's a hell of jobs since my hands seemed too big to access the back screws but anyhow got the job done by forcing filters out with two back screws still partially intact.
Does anyone know how to reset the computer so it knows the new air filters? I just reset my service B which didn't seemed to recognize the clean air filters since my engine still idling rough.
Does anyone know how to reset the computer so it knows the new air filters? I just reset my service B which didn't seemed to recognize the clean air filters since my engine still idling rough.
