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  #1  
Old 03-20-2001, 08:34 PM
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Location: Northern California
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My 190e 2.3L developed an irritaing rough idle with a mild clicking sound from the valve cover. When the service interval came up, I took it to a local mechanic who have been doing Benz only for years. I was told that after a compression check they found the #2 cyl was not up to spec, lifter was bad (thus the clicking sound). My 190e has 120K miles on it, so the recommended valve job was carried out, plus fuel govenor was replaced (leaking), O2 sensor replaced, temp sensor replaced. When i got the car back, the rough idle was still there. After reading this forum for lead, I replaced the original OVP, kickdown relay, fuel filter and coil....still no solution to the rough idle. What else could be causing this irritating rough idle??? Any guesses or pointer. No loss of power or hesitation while driving. Rough idel only at light or when in P or R. Rough idle more apparent when engine warms up.
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  #2  
Old 03-20-2001, 09:47 PM
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Just a hunch,

But have you added any gas treatment lately? My 190E 2.3 idled rough when the gas treatment was in my tank. Perhaps try it with a dose of higher octane? Just a guess.



Vu

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  #3  
Old 03-20-2001, 10:37 PM
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Nope gas treatment is not the culprit. Its been several tank full already.
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  #4  
Old 03-21-2001, 12:16 AM
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Depending on how rough the idle is, you could be possibly getting vibrations from the montor mounts being collapsed and a "rough idle" that can't be fixed by correcting the engine tune. Check other posts back quite a few months for motor mounts on the 190E. It may help.
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  #5  
Old 03-21-2001, 01:01 AM
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I fogotten to include that motor mount was replaced too when the valve job was done.
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  #6  
Old 03-21-2001, 06:06 AM
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I've been having the idle control relay on my mind these couple of weeks. I, too, have intermitten rough idle - and gonna replace the relay soon.

Checked your idle control valve too? Perhaps get a diagnostics done too? Or perhaps your car needs a new relay?

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  #7  
Old 03-21-2001, 09:21 AM
Clauser1
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W/ my 2.6,I found the culprit.Its a vaccum hose from
the idle valve under the intake manifold.
Check that out.Goodluck.
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  #8  
Old 03-21-2001, 05:16 PM
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Where is this valve located? Is it towards the back of the engin near the firewall or towards the front of the engine??
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  #9  
Old 03-21-2001, 08:14 PM
Clauser1
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On a 2.6 if you pull the air cleaner out the valve is in front of the fuel distributor.Its hard to reach though.
On your car Im not sure.But ibet its abuot the same.
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  #10  
Old 03-21-2001, 11:21 PM
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About where it is.

Spoke to my mechanic today, and he reckons that if you live or drive through must dusty areas, its likely that the valve could be dirty. Give it a clean, he said, and there should be a difference.
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  #11  
Old 03-22-2001, 12:10 AM
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How should I clean the valve? Will brake cleaner do? will it hurt the valve? I've also refer to Hanes manual and the only item that comes near is the "Fuel Pressure Regulator". This has a vacum tube coming from the shaped hose from the valve cover and the "Idle Speed Air Distributor"
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  #12  
Old 03-22-2001, 11:37 PM
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I had the valve taken out for a clean today.

Remove the huge black cover of the air-cleaner (filter), and you'd see the valve sitting just infront of the fuel distributor. You might have to take off 2 screws holding it, and then gently nudge it out.

It looks like an artificial heart with the aorta.

Take that out and spray WD40 or equivalent into both the openings. Spray liberally to dislodge any dirt in it. It should be quite clean. The object is to ensure the pistons inside this valve (it really does function like a heart after all) is clean and allows it to function efficiently.

Then, having yourself satisfied its clean, give it a "blow job" to make sure its not dripping with WD40 (not too much though I did say liberal). Rreassemble. Start and examine your idle.

It should work.

Otherwise ... perhaps change the valve ... approx. USD100-00.
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  #13  
Old 03-23-2001, 12:59 AM
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Thanks YMSin, I think I finally understand what you are refering to. I've been swayed by different terms used both by the HANES manual and post in this forum. I've also did a search on Fastlane and reconfirmed it's called "Fuel Pressure Regulator". I'll try cleaning it this weekend. Oh, by the way was there much fuel spillage when the fuel line was disconnected?
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  #14  
Old 03-23-2001, 01:44 AM
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Wooah ... the idle control valve IS NOT connected to the fuel lines. It connected by 2 hoses which buses air to and fro the valves.

Its position in front of the fuel distributor but is NOT at all link to the fuel.

However, as much as we'd like to solve your eeeratik idle, I think you had better run a diagnostic test on the engine. The problem MAY not solely be the valve control because you did say the idling gets worse when the engines warmed up?

When you run your MB at cruising speed, do you experience any sudden jerk or loss of power?
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  #15  
Old 03-23-2001, 02:31 AM
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Crusing is smooth as silk, idle only evident when fully stop with gear in P or R. No loss of power either. Now I am more confuse than ever.
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