16Valve 1986 Air flow Meter

Hello
I have been having problems with the idle on my 1986 190E 16V especially when it warms up and even more so after a decent run at driving RPM's. Anyway, I had it checked by a specialist and he checked the ohm reading on the air flow meter and said it was not reading as it should consistently which make sense because the idle only acts up one out of ever four times.

The problem with the idle is that it either stays at 2000 Rpm after a driving stint or will fluctuate around 1500 by its own. Usually if I gas it a few times it comes to rest at 1000 Rpm where it should be.

Is the airflow meter a good suspect here? Are there any place to get a cheap one? I here the price is around 400-500 for a new one? Is there a possibility of getting a used one? What are the risk of used ones not working?
Or
Is there any chance of being able to salvage the one I have?

Thanks for the help
Pete

------------------
Peter S. Bauman
190E 16Valve 1986

Peter:

Wecome to the forum. There have been PLENTY of posts/solutions on this very topic. Use the "search" feature with keywords like, "idle", "190E", "16V".

Hope this helps.

Brian
* 1986 2.3-16V
* Pearl Black
17" chrome AMG rims (soon to be 16" AMG monoblocks with Pearl Black faces and polished lips)
* Euro headlights/clear corners/smoked taillights
* K&N air filter

[David Hendy]

This is a familiar trait for the 16V. Before you contemplate expensive repairs, try adjusting the CO mixture at idle.

Somewhere in the archives is a great post from Adrian Eckenrod that explains how to adjust the CO idle mixture (a tiny allen screw behind the airbox). I had the same problem when I had a 16V and by changing the idle mixture it went away.

David Hendy

[Benzmac]

Two things here. The air plate postion sensor should be checked for voltage at pins 1&2 with the key on. There it can be graphed and scoped for inperfections. The air plate position sensor can cause this or a throttle switch. Any one thing can cause this because the system will go into limp. There is no onboard diagnostics. You have to check each sensor at a time/

------------------
Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM