Low engine rpms at idle for 93 190E 2.3L

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CP - 20 Oct 2005 23:45 GMT

I have a 93 190E 2.3L and when I put the thick oil 20W-50 this past
June 2005 I noticed that the engine would on occasion idle and vibrate
at a low rpm after initial startup and at other times it would idle low
at a stop when the car engine was warmed up 100 C and had been driven
for over an hour.

Is it the oil that is the problem or something else???

Any ideas?

CP

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Martin Joseph - 21 Oct 2005 07:47 GMT

> I have a 93 190E 2.3L and when I put the thick oil 20W-50 this past
> June 2005 I noticed that the engine would on occasion idle and vibrate
[quoted text clipped - 3 lines]
>
> Is it the oil that is the problem or something else???

It's not the oil, IMO.

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Guenter Scholz - 21 Oct 2005 19:38 GMT

>> I have a 93 190E 2.3L and when I put the thick oil 20W-50 this past
>> June 2005 I noticed that the engine would on occasion idle and vibrate
[quoted text clipped - 3 lines]
>>
>> Is it the oil that is the problem or something else???

I agree, not the oil. Do, however, have a look at the fuel pressure
regulator valva bolted on the side of the air intake to see if it's leaking.
Do you smell a little gas??

cheers, guenter

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CP - 25 Oct 2005 18:10 GMT

Are you sure its on a 93 190E 2.3L?

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Jens - 26 Oct 2005 08:49 GMT

Yes, it is a small valve (approx. 1½ inch diameter, 2½ inch long)
with the fuel return line connected to it. It is actualle at front of
the air intake (air filter assembly removed).

Anyway, the idle speed is controlled by the engine computer (thereby
not adjustable) through the idle speed air valve, which is located
behind the air intake and fixed to the intake manifold by a rubber
piece. Check also if all tubes around it are correctly fitted.

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