Fluctuating idle speed
Thread Starter
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,105
Likes: 11
From: Toronto, Canada
2019 C300 Wagon; '75 Triumph TR6; previous: 2004 C230 6spd sold after 17 years of driving
Fluctuating idle speed
My 1.8K has an intermittent idle issue:
Sometimes it is steady ~700rpm and other times it varies up and down by a couple hundred rpm as if someone is playing with the throttle i.e. goes up to 800 then back down to 600 then back up to 800 and so on every couple of seconds.
2nd problem:
from idle if I increase the throttle gradually no problem, if I quickly push it down the engine stumbles and then catches up to the correct rpm
Sometimes it is steady ~700rpm and other times it varies up and down by a couple hundred rpm as if someone is playing with the throttle i.e. goes up to 800 then back down to 600 then back up to 800 and so on every couple of seconds.
2nd problem:
from idle if I increase the throttle gradually no problem, if I quickly push it down the engine stumbles and then catches up to the correct rpm
Member
Joined: Mar 2007
Posts: 112
Likes: 0
From: Melbourne, Australia
CL203 & sprinter
you have the M111?
i got the same problem... i thought i might have something to do with the spark plugs not being changed for the last 80,000kms on my car.
guys, any input would be helpful.
Thanks in advance
i got the same problem... i thought i might have something to do with the spark plugs not being changed for the last 80,000kms on my car.
guys, any input would be helpful.
Thanks in advance
Senior Member
Joined: Sep 2007
Posts: 399
Likes: 0
From: NorCal
'02 CL203 M111
it's M271 1.8
Well I've heard that in other threads. what I've gathered is (in importance order):
-check intake filter first
-check spark plugs
-clean MAF sensor
-change fuel filter
-check for clogged catalitic converter
hope it helps.
Well I've heard that in other threads. what I've gathered is (in importance order):
-check intake filter first
-check spark plugs
-clean MAF sensor
-change fuel filter
-check for clogged catalitic converter
hope it helps.
MBWorld Fanatic!
Joined: Feb 2003
Posts: 1,418
Likes: 343
From: Charlotte, NC
Had: 1987 300TD, Had: 2004 C230 Sport Sedan, Have: 2014 E350 Sport, Have: 2019 S450
You haven't said if you've had the lower PCV hose recall done, but check this https://mbworld.org/forums/showthrea...light=campaign
and check the wiring harness below the cam sensors for oil (and pray that you don't have this problem) https://mbworld.org/forums/showthrea...light=campaign
and check the wiring harness below the cam sensors for oil (and pray that you don't have this problem) https://mbworld.org/forums/showthrea...light=campaign
Member
Joined: Dec 2006
Posts: 118
Likes: 0
From: Casa Grande, Arizona
2005 c230k
You haven't said if you've had the lower PCV hose recall done, but check this https://mbworld.org/forums/showthrea...light=campaign
Thread Starter
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,105
Likes: 11
From: Toronto, Canada
2019 C300 Wagon; '75 Triumph TR6; previous: 2004 C230 6spd sold after 17 years of driving
Hose has not been replaced, unfortunately this recall is not covered by warranty in Canada as MB Canada says that this is not an issue.
Cam sensors were replaced under warranty
replaced new air filter
Cam sensors were replaced under warranty
replaced new air filter
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MBWorld Fanatic!
Joined: Oct 2004
Posts: 1,305
Likes: 37
From: Las Vegas, Nevada
2013 C350 Coupe, 2005 C230K Kleemann Sedan, 2013 GLK350 4matic
I beleive to some extent, the idle speed will vary a bit because of load (ac cycling, alternator load, engine temperature). I see my care idleing between 650-700 rpm. The idle is smooth and normal.
Now, if your engine is runningrough as well as the idle speed v arying, then I would be more concerned.
Now, if your engine is runningrough as well as the idle speed v arying, then I would be more concerned.
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Thread Starter
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,105
Likes: 11
From: Toronto, Canada
2019 C300 Wagon; '75 Triumph TR6; previous: 2004 C230 6spd sold after 17 years of driving
Seems that my 2nd problem corrected itself just out of the blue
I tried to do a search in resetting the throttle position sensor but could not find the link, if someone could tell me how it is done that would be great
MBWorld Fanatic!
Joined: Mar 2007
Posts: 1,518
Likes: 1
From: STL
W203 C230SS
https://mbworld.org/forums/c32-amg-c55-amg-w203/148135-makin-sure-c55-32-brothas-hooked-up-ecu-reset-smokes.html
if that doesn't work- check your connection between the airbox and throttle body- could be an air leak there and the engine could be pulling in unmetered air. also clean the maf with electrical contact cleaner.
if that doesn't work- check your connection between the airbox and throttle body- could be an air leak there and the engine could be pulling in unmetered air. also clean the maf with electrical contact cleaner.
Newbie
Joined: Dec 2019
Posts: 1
Likes: 0
05 silverado
How to
To RESET the throttle Follow the following steps:
1. Turn the ignition key to the on (NOT start) position.
2. Press the gas pedal to the floor and HOLD for five seconds.
3. Turn the key to the "off" position (don't remove the key), then release the gas pedal.
4. Wait at least two minutes - don't do anything.
that should reset the throttle position sensor. Please try the above and report back.
18, 2004, boost, c230, correct, fluctuates, fluctuating, fluctuatuing, idle, kompressor, mercedes, problems, rpm, speed, triumph
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