Idle running problems

[MB190E2,3]

Hi,

I have a MB 190E 2,3 (1986). The problem is that the idle running suddenly became uneven. The economy gauge is´nt any moore at zero (as normally at idle runnig) but rises to 1/4 of full range. Any hints ?.

[mike65]

Clean out the throttle body before you do anything else there's another thread about the difference it can make on the 1st/2nd page.[:)]

Mike.

[MB190E2,3]

Hi,

Thank you Mike65 for your response. I have already done that as hinted on the specified page.

[mike65]

What rev speed does the engine idle at? Does the car pull away from idle cleanly or does it cough/stumble?

btw I proberly dont know the answer but what you say might help someone else diagnose whats wrong.

Mike.

[big_b]

hmmm. mine has always idled with the economy guage at about 1/4. if you think about it, it really should be at full, since you're using gas and going nowhere.

[spanners]

big_b - 9/2/2004 5:47 PM

hmmm. mine has always idled with the economy guage at about 1/4. if you think about it, it really should be at full, since you're using gas and going nowhere.

The gauge works directly from the vacuum in the inlet manifold, so when idling, there is little vacuum as the throttle flap is shut, that's why it isn't at full at idle.

[az190]

Correct as always.

[ltooz]

There is a hose hooked up to the valve cover breather under the air cleaner assembly, the plastic hose is hard plastic and get brittle over time, cracked, air will leak and cause hard to start and bad idling. Get a vacuu m hose 5/32 and replace it, it will be as good as new with the body throttle cleaner.