93 300E question - Mercedes-Benz Forum
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#1 (permalink) Old 11-17-2004, 01:16 PM
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93 300E question

Have a problem with my 93 300E, it has a rough idle. When I stop at a stop light, the rough idle starts and the car shakes a little, but if I give it a little gas, it runs smooth. I took the car to German Motors, they called the next day and said it was the EGR valve. The cost would be $376.00, I said ok. The next day they called again and said the wrong EGR came in, there are two types for my car and it was the other. When the other comes in it will cost me $483.00. (I believe there is only one type for my car, the 3.2 engine has two)Got a call the next day and they said that the new EGR valve was installed and the rough idle is still there. They said it may be the Air Mass Meter and will install one tomorrow. Anyone here have any ideas before I go broke?
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#2 (permalink) Old 11-17-2004, 01:22 PM
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RE: 93 300E question

GET THAT CAR OUT OF THERE!!!![:0]

Its probably your motor mounts!!
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#3 (permalink) Old 11-18-2004, 07:18 AM
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RE: 93 300E question

It could be a dirty throttle body bore. A toothbrush and some solvent would cure it.

95 E320 cabriolet, 121K
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#4 (permalink) Old 11-18-2004, 07:37 AM
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RE: 93 300E question

I had a similar type problem with my car, and it was bad spark plug. I changed the plugs and wires, and even did the suppressors and now it's fine. But check the plugs first.
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#5 (permalink) Old 11-18-2004, 08:34 AM
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RE: 93 300E question

Where are you located?
Also do not pay the guy if is the shopp that I think it is ...he is a scammer... I think I had my car thre once.
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#6 (permalink) Old 11-18-2004, 10:15 AM
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RE: 93 300E question

wtf check the motor mounts. They're probably flat as a pancake

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#7 (permalink) Old 11-18-2004, 12:02 PM
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RE: 93 300E question

They installed a new air mass meter and it didn't change. The rough idle is still there. Also could not find any vacuum leakes and the motor mounts are good. He said the next step would be to clean the throttle body but it doesn't look that dirty and take the exhaust manifold off to take a look inside. Any other options???
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#8 (permalink) Old 11-18-2004, 01:10 PM
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RE: 93 300E question

With the throttle body, it may look clean but the deposits may be only adjacent to the butterfly valve. It is THOSE deposits that give problems.

How about the OVP? It is located under the hood at the passenger side rear. It's a silver colored rectangular thing behind the black plastic cover on the firewall side of the battery with a fuse or two visible on the top. You won't be able to see it unless you remove the plastic cover. Check your OVP for the known bad part number, 000-540-52-45. It says “Made in Austria� on it. If that is the part number on you OVP, get the new updated OVP - replacement number 000-540-67-45. The 52 45's are known trouble-makers and I suggest replacing them even if all is well with the vehicle. It's only a matter of time before they go bad. It's easy to replace for a DIYer.

Another thought - do you have the dreaded engine wiring harness problem? It's relatively easy to check... peel back some of the wiring wrap and look at the wire insulation. If it looks brittle and cracked, you've probably found the problem.

I really question the diagnostic skills of the shop where you took your car. They're the kind that just throw parts at the car until it's fixed, all the time telling you these parts were bad (yeah, right) and charging you for it. You need to find a mechanic that'll properly diagnose your problem before undertaking a fix.

95 E320 cabriolet, 121K
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#9 (permalink) Old 11-20-2004, 08:13 AM
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RE: 93 300E question

Will talk with the mechanic tomorrow about the OVP and the wiring. He first said that it was the EGR valve, he replaced it and it didn't change anything but he said that it was bad any way and needed to be replaced. I wonder if it was bad. I'm going to ask for that used part back. Is there a way that I can check it to see if it was bad? I trusted this guy as he is a ASE certified Master technician. The car is at a place called Dubble's German Motors in Reading Pa. My car has been their over 9 days now and still has the same problem and the bill is over $500.00 so far. I hate to take it back and start all over again somewhere else. Any other ideas on what it can be???
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#10 (permalink) Old 11-20-2004, 09:01 AM
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Checking EGR Valve

There are two things to check for a functioning EGR valve. First is to pull a vacuum on the diaphragm. The pintle must move or else it is stuck, and the vacuum must hold or the diaphragm is leaking. Second is to try to pass air across the poppet valve. If you can pass air across the valve it isn't seating properly becuase of accumulated deposits.

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