[W126 Coupe] rough idle

[Doug Gavin]

Jonathan wrote:

> Really??  I've been through some 15+ units professionally, sold @ 

> least 2X that w/ nary a problem.  The Python units were horrendous, 

> but the guy @ CIS Flowtech Really knows his FD's and does great work 

> by all accounts I've heard.

>

> I don't think MB is selling New anymore..  You can buy a Bosch reman 

> for about 2K (or I have them on special via my site for 1100:)

>

> Jonathan

>

>

> Gerry Van Zandt wrote:

>> Reman fuel heads (fuel distributors) in general are, I hate to say 

>> it, problematic -- even the rebuilds that Bosch themselves do. Your 

>> best solution -- and I know it is not cheap -- is to get a factory 

>> new unit from MB. Last time I checked they were over $2K from MB, but 

>> at least they have a warranty on them, and you know what you are 

>> getting.

>>

>> This definitely sounds to me like a fuel distributor or related 

>> issue. My second guess is a vacuum leak -- similar deduction to you. 

>> Have you thoroughly checked out the ENTIRE vacuum system for leaks?

>>

>> Cheers,

>> Gerry

>>

>>

>>

>>

>>

>> On Aug 9, 2007, at 4:28 PM, mbcoupes-request at mbcoupes.com wrote:

>>

>>> Message: 8

>>> Date: Thu, 9 Aug 2007 11:43:45 -0700

>>> From: "Tim Graney" <graneyt at americancylinderhead.com>

>>> Subject: Re: [W126 Coupe] rough idle

>>> To: "'Mercedes Coupes Mailing Lists'" <mbcoupes at mbcoupes.com>

>>> Message-ID: <000001c7dab5$37d06b10$7901a8c0 at timpc>

>>> Content-Type: text/plain; charset="us-ascii"

>>>

>>> I bought the FD from German Star...? I did replace all the rubber

>>> gaskets in the plenum. vacuum stays nice and steady but does hiccup

>>> every once in a while. I have looked till the cows come home for any

>>> vacuum leaks. where does one get the right spark plugs...these are 

>>> Bosch

>>> plugs. what gap should they be? Thanks again

>>>

>>

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>>

>

>

Regarding Jonathan's response. I recalled that the Bosch FD from 
CarQuest that I mentioned was *new*. I will call them tomorrow to 
confirm. Thanks

Doug