Mercedes-Benz Forum - View Single Post - Temporary rough idle warm & cold after starting
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post #10 of (permalink) Old 06-14-2019, 07:25 AM
BenzWorld Senior Member
Date registered: Nov 2018
Vehicle: 1991 560SEL
Location: Richmond Virginia, USA
Posts: 484
Mentioned: 4 Post(s)
Quoted: 117 Post(s)
Originally Posted by JR420 View Post
Update - I have decided to opt for a fuel distributor rebuild and fuel injector cleaning svc/test via Ebay. Today I removed fuel distributor and injectors on 90 420SEl with 87k miles for reference. Car is original Seattle bought life long resident so you can imagine based on our climate that it's friendly to rubber, interiors and not prone to rust. In fact car is completely rust free and many of the rubber items like axle boots are in incredibly good shape.

Anyhow upon removing fuel injection items here is what I found interesting - job was pretty easy (one fuel connection bracket had to be slightly and temporarily moved via pliers to remove 1 fuel injector holder allen bolt) with total time to remove fuel distributor, injectors and plastic nozzle holders about 70 minutes. No injector felt secure in it's plastic nozzle holder after removing clamps. I understand they should have still been secure in their fitment. This tells me I probably had one or more injector that wasn't completely sealed and thus letting in unregulated air. Some of the plastic nozzles were also loose in intake manifold and could be spun freely which would cause potential additional air leak issues. After removing I certainly wouldn't trust a 30 yr old car with original injector nozzles and fuel injector seals to be sealing properly so I ordered all knew ones this evening as they are very inexpensive.

Boxed up fuel distributor and injectors to send for service and will update in a few weeks on outcome.

(For those following my other thread on differential I'm still trying to figure out best option, used replacement or rebuild Will update on that thread upon conclusion. Diff comes out this weekend, so much for low key and relaxing on Fathers Day).
my distributor/injectors arrived in California (to the same rebuilder) this past Wednesday. Havent heard back from him yet, but i hope to have everything back by late next week. My only concern is potentially having to make various adjustments in the fuel system to get things running smoothly? Or is it possible that it will be as simple as carefully reinstalling the injectors/fuel distributor and she'll fire right up and run flawlessly?
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