02-20-2010, 03:07 AM
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Registered User
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Join Date: Feb 2010
Location: NYC AND ATHENS GREECE
Posts: 103
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Quote:
Originally Posted by zhandax
The bad news is all the rubber/plastics under the hood which perform a sealing or insulating function is approaching or past serviceable life. The better news is that many of these parts are relatively inexpensive, at least compared to sensors/mechanical components.
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Well waited till dark and after dinner me and my cousin opened up hood to see if there was any arcing.
We took off air filter housing and removed drivers side plug cover, no arcing. Decided to pull passengers side plug/wire cover off , absolutely no arcing.
Was sure to wait till engine temp got to over 8O Celsius no arcing . Looked at the wires when at idle, and loaded engine in gear no arcing .
I saw the 3 suppressor wires that dealer/ mechanic had said he changed, they were red colored caps so now at least I know which cylinders he thought might be suspect. Plug wires looked really good , even my cousin said he was surprised that after 17 years they were supple not dried or cracked or anything. No arcing at all
Looking around engine compartment to get an idea if anything else was obviously wrong and we found a vertical plastic hose coming out of a bundle that went in to an L shaped black rubber hose that connected to what looked to him like an EGR valve that is aprox 8-10 inches in left hand corner in front of the throttle body.
It is seen in the front left hand corner of the second photo of post #9 in
http://www.benzworld.org/forums/w140...nder-load.html
In case the photo does not come thru I will describe it as best as I can.
The part that the broken hose went in to was approx 1 3/4 inches in diameter and looks like a flying saucer .
Well since the plastic hose was broken off about 1/4 inch from where it went in to the black rubber hose we pulled the broken plastic part out.
There was not much play left in rubber hose but it seemed we were able to reverse the L shaped hose, and sorta stretch it and get it back on the valve. We thought we found the problem . Drove the car and it made no difference .
My cousin was not sure that the stretched hose was making a good connection and allowing the vacuum to function, so we left the hose off the valve entirely and I drove home 25 miles. Car drove perfectly without hose attached at all, and did not exhibit any hesitation, when I got back to city upon aggressive accelleration. I did not expect it to ,as highway driving kept engine temperature around 60C and it usually only happens after 80 C is reached.
It is possible that the repair we made stretched the hose so the vaccum could not function properly , but if that in case, is not the fact, then what is this valve that made no difference being unattached ?
So no arcing, and since it is past midnight , I will buy a new L shaped hose and attach it tomorrow and hope that is the problem.
It also is possible the 2 mechanics messing around in the engine compartment changing plugs ,and then rotors broke the hose/plastic piping .
What is that vacuum part called, and what does it do. Is it possible to be my problem?
Still lost 
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