stuck high revs when stationary
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Joined: Jan 2008
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From: UK
E55K AMG
stuck high revs when stationary
Hi all any ideas will be appreciated?
Place car in P or N and rev engine and revs get stuck around 2k,
turn off and start again or put into D and its fine until revs are applied again in P or N. Drives no different.
This has happen after I changed the valve cover gaskets and steam cleaned the engine! Checked hoses/coil packs/leads but not much was disturbed in the first place.
Is the throttle body getting stuck and needs servicing or is it something to do with the recent work?
Place car in P or N and rev engine and revs get stuck around 2k,
turn off and start again or put into D and its fine until revs are applied again in P or N. Drives no different.
This has happen after I changed the valve cover gaskets and steam cleaned the engine! Checked hoses/coil packs/leads but not much was disturbed in the first place.
Is the throttle body getting stuck and needs servicing or is it something to do with the recent work?
Last edited by £ C43 £ AMG £; Feb 16, 2010 at 07:26 PM.
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From: orlando,fl
e55
happen to me when i changed valve cover gaskets too .. in the back side of engine hose wasnt on .. at the time had no idea what it was till did smoke test and found it . take off airbox and look all in the back side of engine around throttle body area and it will be back to normal
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E55
Sounds like a classic vacuum leak. The hose from each valve cover connect to a "t" which connects to the bottom of the throttle body. I would start there and make sure that "t" is connected firmly to the throttle body.
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E55K AMG
Thanks people for posting your exsperiences so far
.
Its frustating when you cure one problem another one is created, I hope my steam clean which I did last week did not cause this ............(I know and please dont remind me that its always a risk, but it was covered in oil from the gaskets leaking)
I am 99% sure when I checked all the vacum hoses agian last night that they were ok and the one to the TB was secure. Maybe I have a split I cant see..........
I will check/remove/replace agian and if I cant see the problem I will block up the TB inlet hole just to test and see if it stops the high idle problem
. Its frustating when you cure one problem another one is created, I hope my steam clean which I did last week did not cause this ............(I know and please dont remind me that its always a risk, but it was covered in oil from the gaskets leaking)
I am 99% sure when I checked all the vacum hoses agian last night that they were ok and the one to the TB was secure. Maybe I have a split I cant see..........
I will check/remove/replace agian and if I cant see the problem I will block up the TB inlet hole just to test and see if it stops the high idle problem
Last edited by £ C43 £ AMG £; Feb 17, 2010 at 10:55 AM.
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E55K AMG
I am now 100% sure after checking all the vacum hoses again and behind the TB that they are OK, I pulled both sides off one by one and there is a strong vacuum suction in each pipe back to the TB/T-piece...which gives me piece of mind that its not leaning out the fuel mixture.
I am thinking it was doing this before I changed the gaskets as I have rarely revved the engine in Neutral or Park and the problem is the TB.
Tonight on checking and testing it was intermittent with no pattern, sometimes it would stay stuck at 1500-2000 revs would and some times the revs would drop back down and sometimes they were delayed in dropping back down.
Has any one else noticed their TB butterfly opening and closing ever so slightly (I can just see it almost vibrating when I stare at it closely), as I can only assume it should be still on idle?
I am thinking it was doing this before I changed the gaskets as I have rarely revved the engine in Neutral or Park and the problem is the TB.
Tonight on checking and testing it was intermittent with no pattern, sometimes it would stay stuck at 1500-2000 revs would
and some times the revs would drop back down and sometimes they were delayed in dropping back down. Has any one else noticed their TB butterfly opening and closing ever so slightly (I can just see it almost vibrating when I stare at it closely), as I can only assume it should be still on idle?
Last edited by £ C43 £ AMG £; Feb 17, 2010 at 07:15 PM.
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211-55
You might also want to try a throttle body reset. Skratch77 sent me this before for an unrelated issue:
clear codes (if any)
shut off car
unplug tb plug
turn key to position 2 for 10 seconds
key off position
plug tb back in
key second postion for 20 seconds
off
start car
clear codes (if any)
shut off car
unplug tb plug
turn key to position 2 for 10 seconds
key off position
plug tb back in
key second postion for 20 seconds
off
start car
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Thread Starter
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E55K AMG
I cant get any faults to show up and also no CEL.
Honestly, I was very very careful and meticulous when doing the work, I also resealed the breather covers and used new bolts, I tightened the covers in the same way you do a head gasket and checked everything more than twice. The only thing I did not put back in the same order were the coil packs as these were all put in a box together after removing them.
You might also want to try a throttle body reset. Skratch77 sent me this before for an unrelated issue:
clear codes (if any)
shut off car
unplug tb plug
turn key to position 2 for 10 seconds
key off position
plug tb back in
key second postion for 20 seconds
off
start car
clear codes (if any)
shut off car
unplug tb plug
turn key to position 2 for 10 seconds
key off position
plug tb back in
key second postion for 20 seconds
off
start car
Thank you cahiil55k I will try the reset on the TB also.
This is just a BIG coincidence, were the gaskets leaking so much, that the crank case pressure was lower and now it needs a reset, I find that hard to believe.
Last edited by £ C43 £ AMG £; Feb 18, 2010 at 06:14 PM.
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E55K AMG
Same idle problem, happened more today once engine got hot and not once while it was cold. Two days ago it was the other way around
Also the reason I changed the leaking gaskets was I due to a smell in the cabin,
same smell this morning again after a week of changing the gaskets. Checked and no sign of leaks.
O well the next thread I start will be
"E55 ON FIRE"
what a shame I feel, I am going to burn it and move on.
Also the reason I changed the leaking gaskets was I due to a smell in the cabin,
same smell this morning again after a week of changing the gaskets. Checked and no sign of leaks.
O well the next thread I start will be
"E55 ON FIRE"
what a shame I feel, I am going to burn it and move on.
Thread Starter
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E55K AMG
ok I decided not to burn it.
PLEASE IDEAS ANYONE
as I have worked out that after I rev the car in N or P and the revs get stuck between 1500-2000rpm , when I turn the steering/wheels the revs always go back down to normal 750rpm? but only when I do this?
PLEASE IDEAS ANYONE
as I have worked out that after I rev the car in N or P and the revs get stuck between 1500-2000rpm , when I turn the steering/wheels the revs always go back down to normal 750rpm? but only when I do this?
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E55
Still sounds like a vacuum leak. The extra load from the power steering pump is pulling the idle back down when you turn the wheel.
Have you sprayed around the intake and surge tanks yet? Do you have a scan tool?
Have you sprayed around the intake and surge tanks yet? Do you have a scan tool?
Thread Starter
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E55K AMG
not sprayed yet, but I will do................. best spray to use?
Thread Starter
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E55K AMG
Hello again
went through two tins of carb cleaner today, engine is starting to look very shiny and new.
the only area that was effected when spraying was just under the TB on the right side as you face the car, next to the T piece vacuum there is a black hard plastic type piston that you can physically slide out and springs back in............??
Is this a pressure release valve or is it a cold start component??
Last edited by £ C43 £ AMG £; Feb 20, 2010 at 05:24 PM.
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E55K AMG
Out Of Control!!
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haters crazy
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06 E55, 03FORD P/S,01 E320-4M,99 ML320,O4 E55,05 RUBICON UNLIMITED,
VERY COMMON ON 55K CARS THAT PEOPLE DO THEIR V/C GASKETS ON. REMOVE YOUR AIR CLEANER ASSY,TAKE A FLASHLIGHT AND LOOK AT THE THE SILVER METAL LINE THAT IS YOUR PURGE LINE @ THE LT. REAR OF THE ENGINE. YOU PROBABLY TOOK IT OFF WHEN DOING THE COVERS CAUSE IT'S HELD DOWN BY ONE OF THE BOLTS.LOOK REAL CLOSE WHERE IT GOES INTO THE BACK OF THE CHARGER,IT'S REAL EASY TO MISS THE GROMMET IT SLIDES INTO.HOPE THAT HELPS.
Out Of Control!!
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haters crazy
This is not something you would catch on a visual inspection because its hidden down beneath other things and you cant see it. I thought Audi had retarded designs but looks like MB has at least one too. Didnt have a mirror so we had to use a camera to take a picture of what was going on down there. Sure enough the metal hose was no longer in the grommet. OP should definitely give this a try
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E55K AMG
AMAZING MBTEK SPOT ON 
I removed the TB and got a mirror out, it was very hard to see the hole and the end of the pipe.
Took a while to find it, but once I saw what you described, the problem became crystal clear.
I did not have a clue that the pipe behind the supercharger could just pop out without the bracket attached when I removed the valve covers.
Why does it not throw a CEL, is it not running lean, I know we dont have an air mass meter, but what about the exhaust O2 sensors.
THANK YOU ALL FOR YOUR HELP AND ADVICE it has been very much appreciated credit to all.
(hmhmmm....... shall I fit a catch tank....... given the amount of oil that I saw inside the supercharger inlet)
I removed the TB and got a mirror out, it was very hard to see the hole and the end of the pipe.
Took a while to find it, but once I saw what you described, the problem became crystal clear.
I did not have a clue that the pipe behind the supercharger could just pop out without the bracket attached when I removed the valve covers.
Why does it not throw a CEL, is it not running lean, I know we dont have an air mass meter, but what about the exhaust O2 sensors.
THANK YOU ALL FOR YOUR HELP AND ADVICE it has been very much appreciated
credit to all.(hmhmmm....... shall I fit a catch tank....... given the amount of oil that I saw inside the supercharger inlet)
Last edited by £ C43 £ AMG £; Feb 22, 2010 at 07:04 PM.
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Sl55 2003
AMAZING MBTEK SPOT ON
I removed the TB and got a mirror out, it was very hard to see the hole and the end of the pipe.
Took a while to find it, but once I saw what you described, the problem became crystal clear.
I did not have a clue that the pipe behind the supercharger could just pop out without the bracket attached when I removed the valve covers.
Why does it not throw a CEL, is it not running lean, I know we dont have an air mass meter, but what about the exhaust O2 sensors.
THANK YOU ALL FOR YOUR HELP AND ADVICE it has been very much appreciated credit to all.
(hmhmmm....... shall I fit a catch tank....... given the amount of oil that I saw inside the supercharger inlet)
I removed the TB and got a mirror out, it was very hard to see the hole and the end of the pipe.
Took a while to find it, but once I saw what you described, the problem became crystal clear.
I did not have a clue that the pipe behind the supercharger could just pop out without the bracket attached when I removed the valve covers.
Why does it not throw a CEL, is it not running lean, I know we dont have an air mass meter, but what about the exhaust O2 sensors.
THANK YOU ALL FOR YOUR HELP AND ADVICE it has been very much appreciated
credit to all.(hmhmmm....... shall I fit a catch tank....... given the amount of oil that I saw inside the supercharger inlet)
