190e 1.8 auto tick over

[karle]

Hi i have a 93 k.reg 190e 1.8 auto this car was running a1 till last week when the tick over went up from 800-850 rpm to 1500rpm's and will not go down.
i have put new plugs oil and filters in this week but still the same.
it's a right pain round town..please help
if you need any more info just ask..
cheers all
karl

[sbourg]

Take off the air cleaner and block the airflow meter inlet with something flat while the engine is idling. If the engine does NOT stall, you have an air leak, probably in one of the idle air hoses or a vacuum line.

Steve

[karle]

Originally Posted by sbourg

Take off the air cleaner and block the airflow meter inlet with something flat while the engine is idling. If the engine does NOT stall, you have an air leak, probably in one of the idle air hoses or a vacuum line.

Steve

cheers Steve
I will try this tomorrow and let you know how it went..
Regards karl

[karle]

Originally Posted by sbourg

Take off the air cleaner and block the airflow meter inlet with something flat while the engine is idling. If the engine does NOT stall, you have an air leak, probably in one of the idle air hoses or a vacuum line.

Steve

I put a flat card over the airflow meter inlet and it stalls..

[haasman]

Make sure all your throttle linkage is lubricated. Be sure it moves properly. Have someone push the accelerator pedal while you look at the linkage (take the air filter off) Watch for old and brittle rubber connecting tubes.

If brown telltale rust around the throttle linkage connectors, remove one at a time, clean and lube with something such as ATF. It provides lube but unlike a paste doesn't attract too much dirt.

You can pop the bell cap ends off by using a 10mm wrench end.

Keep us posted.

Haasman

[sbourg]

Remove the electrical connector from the idle control valve to see if idle drops. If so, you may be running too rich. If not, the ICV may be sticking open, and should be cleaned. It is also still possible you have a small air leak - check all air hoses for cracks or loose fitting at connectors, and for vacuum lines disconnected.

Steve

[karle]

Originally Posted by sbourg

Remove the electrical connector from the idle control valve to see if idle drops. If so, you may be running too rich. If not, the ICV may be sticking open, and should be cleaned. It is also still possible you have a small air leak - check all air hoses for cracks or loose fitting at connectors, and for vacuum lines disconnected.

Steve

Hi Steve
I went out to my car and disconnected the idle control valve and it drops to a 850rpm spot on.But when i put it back on the engine revs to 1500rpm again so may be running to rich. It was getting too dark to check all the air hoses.will check tomorrow..I have the car booked in at a mercedes main dealer on 29th i hope they fix it quick as they charge £80 per hour labour..(robbing gits)
Cheers Karl

[karle]

Originally Posted by haasman

Make sure all your throttle linkage is lubricated. Be sure it moves properly. Have someone push the accelerator pedal while you look at the linkage (take the air filter off) Watch for old and brittle rubber connecting tubes.

If brown telltale rust around the throttle linkage connectors, remove one at a time, clean and lube with something such as ATF. It provides lube but unlike a paste doesn't attract too much dirt.

You can pop the bell cap ends off by using a 10mm wrench end.

Keep us posted.

Haasman

Hi Hassman
Thanks for the info. I looked at all the linkage's today and it looks in very clean condition ie no rust i have lubed all the moving parts.
but still runs the same.
Cheers karl