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  #16  
Old 10-16-2002, 05:14 PM
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I don't think the problem with the engine wiring harness issue is a discoloration of the copper wire, it's that the insulation degrades, cracks, and falls off, allowing the wires to short out.

There are other places to check for failing insulation. You can use a utility knife and carefully slit open the black fabric covering of the wiring harness portion that runs across your firewall.

It will be real obvious.

It is characteristic of this problem to surface after the harness has been handled, in particular after a head removal and head gasket replacement.
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  #17  
Old 10-16-2002, 06:54 PM
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I agree that discoloration has nothing to do with the condition of the wires. Insulation do affect the condition of the wire. Since I am not getting spark on some plugs I wen't to ckeck the condition of the fuel injector wires. I did not get any shorts or partial short and ground to the positive side on any of these wire. When I turn on the ignition, I got 11.99 volts. So, I presumed the problem wasn't there. I never had any problem with the wiring harness before nor gives me indication that the harness is deteriorating. I did sprayed wd 40 on all injector wire sockets. I will try to spray a contact cleaner just to be sure. But, the voltages and resistance reading at the plugs give me a good reading and no intermittent readings.
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  #18  
Old 10-18-2002, 02:14 AM
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Rough idle fixed
Just want to everyone that the rough idling of my car was due to the deterioting condition of the wiring harness. Tom and Suginami are right. I bought the wiring harness at the MB dealer in Oakland for $565.00. It took me only two hours to install the harness. The car is running smoothly and with more power now. No more oil leak.
Here is the picture of the bad wiring harnes.
Attached Thumbnails
Cylinder Removal-p1010362.jpg  
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  #19  
Old 10-18-2002, 03:19 AM
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When I saw your first picture a while back, I thought "Oh my!". But you really have dogged determination and an ability to follow through methodically. I'm impressed. Congratulations!
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  #20  
Old 10-18-2002, 05:38 AM
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I agree. That was a cool thread.
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  #21  
Old 10-18-2002, 02:23 PM
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Thumbs up

The reason why I didn't make serious mistakes was I keep my digital camera handy with me while going through with the car repair. I took pictures every step and whenever there are steps that I am not familiar with.
My advice to others when going through the same process I went is take pictures and be careful with the wiring harness if they are still okay. Avoid bending them. You will ruin the insulation. You will find out if you open the black cloth tape cover.
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  #22  
Old 10-18-2002, 04:21 PM
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Very nice.
I was wondering why you decided to do a head job and also whether you tried to get MB to pay for your wiring harness.
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  #23  
Old 10-18-2002, 04:48 PM
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I decided to do the head job myself becasue I lost trust with my mechanic when I first brought the car to fix the oil leak. He said it was the oil pan gasket so, he replaced the gasket but that did not solve the problem ($400.00). The next probable cuased was the top front seal and it was also replaced but the leak was still present(another $400.00). By careful examination, I found out that it was the head gasket that was causing the leak. With the help from all the experts in this forum I decided that I am going to do it myself.
About the wiring harness, I asked the sales rep about recal and he told me that he doesn't know of any recall regarding wiring harness. I go to the dealer only to buy parts that I needed right away. So, I did not argue with him anymore.
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  #24  
Old 10-18-2002, 04:55 PM
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Thanks. My head gasket looks dry but oil is dripping off the bolts that support some steel cooling lines at the right front of the oil pan and it looks to me like my upper timing cover is leaking. I've been debating when I should fix the leak. I imagine I should do the head and timing gaskets at the same time. I'll probably wait until the oil leak gets worse. Cardboard for the garage floor is cheap.
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  #25  
Old 10-18-2002, 05:17 PM
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Tom, if your head gasket is not leaking, then I wouldn't touch it.

The leak at the upper timing chain cover is not an expensive gasket to replace to fix the leak.

I'd just do that.
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  #26  
Old 10-18-2002, 05:41 PM
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Quote:
Originally posted by mbe32094
About the wiring harness, I asked the sales rep about recall and he told me that he doesn't know of any recall regarding wiring harness.
MB replaced wiring harnesses under a "goodwill" program for cars with under 100K miles. Dealerships were not required to abide by this program, so some did this cheerfully while others required "pulling teeth" to do so.

Three years ago, my harness was replaced by the dealer free of charge after I was experiencing severe loss of performance.

I admire your ability to take on such a daunting task! Mine is about due for replacement, but I am holding off until it becomes problematic (overheating, copious leaking, oil in coolant, etc.).

I thought about doing it myself...until I saw your pics (YIKES)
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  #27  
Old 10-18-2002, 08:07 PM
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Just for the record, there was no recall for this wiring harness.
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #28  
Old 10-18-2002, 10:48 PM
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is dat de dreaded green anti freeze I see???????
better be red than dead............
William Rogers.........
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  #29  
Old 10-20-2002, 03:36 AM
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is dat de dreaded green anti freeze I see???????
better be red than dead............
William Rogers.........

Yes, it's the anti freeze. The water pass through those holes to cool the engine. When I cleaned the top portion of the pistons, I covered the water inlet with rags so that no foreign object will be mixed with the anti freeze.
So far the car is running very smoothly. My wife noticed it when she step on the gas and the car responded quickly w/o hesitation.

Fred
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