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Old 12-22-2002, 08:26 PM
Registered User
Join Date: May 2001
Location: Portland, OR
Posts: 29
fuel distributor replacement

In my attempt to correct a persistent rough idle problem on my '86 300E, I am faced with replacing the fuel distributor. My mechanic says the #5 cylinder fuel feed is not correct. In fact he swaped out the fuel distributor with a known good one in his shop and it corrected the rough idle. He has a very good reputation, so I trust him in this matter.

All other possibilities have been checked, including fuel injectors, wires, plugs, cap, rotor, compression is even, motor mounts are new, OVP relay is good, fuel filter ok.

I bought a fuel distributor from a u-pull it for $150, which was attractive considering the alternatives ($1327 at dealer!). They even gave 30 days to bring it back if it does not work.

My question is this. I am confident I can swap the distributor out. What other things must be adjusted or checked after replacement? I can check lambda using the duty cycle method. Any other pitfalls?


'86 300E
262,000 miles
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Old 12-22-2002, 09:35 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,359
I'd let your trusted mechanic do the work. It would seem that he isolated the problem. I'm not versed on fuel distributor removal; it seems to me in this case you should just let your local pro finish this one for you.

My 2 cents.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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Old 12-22-2002, 09:56 PM
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Join Date: Aug 2001
Location: secret
Posts: 3,044
I agree with Mike. As a matter of fact, if he went to the trouble of changing out yours for a 'known good one' I would probably have given him a check right then, and driven off with the known good one!!
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