[W126 Coupe] Hesitance on driving

[Sharan Bains]

Hi,

Thanks for the suggestions. I've been suspicious on the fuel pumps - but all 
  of the potential causes you listed, I will be checking for. My friend is 
coming round on Friday so will update then.

One of those things which needs a step-by-step diagnosis.....

talbir





>From: "Dick Spellman" <spell.yy at verizon.net>
>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
>Subject: Re: [W126 Coupe] Hesitance on driving
>Date: Tue, 09 Aug 2005 12:15:29 -0400
>
>Hi Talbir:
>
>Well that does point to fuel vs. electric then.  Any thoughts I have would
>be purely guess-work.  I am not much help on this subject I am afraid.
>
>You might want to try a can of BG44K after replacing the fuel filters and
>run it hard for a bit to see if it's just something fouled up on the fuel
>distributor.  Or perhaps you aren't getting enough supply (accumulators) or
>one or more of the pumps is weak.  Leaky or improper set up on the EHA 
>which
>regulates the low side of the fuel distributor.
>
>Have you got access to a fuel pressure gauge that will read both sides of
>the fuel distributor?
>
>Chet Hwilka was the MBCoupes master of fuel issues as I recall.  You might
>want to run the archives for "Hwilka and fuel" in your query.
>
>Regards,
>
>Dick
>
>
>----- Original Message -----
>From: "Sharan Bains" <sharanbains at hotmail.com>
>To: <mbcoupes at mbcoupes.com>
>Sent: Tuesday, August 09, 2005 11:41 AM
>Subject: Re: [W126 Coupe] Hesitance on driving
>
>
> > Hi,
> >
> > It was before the work.
> >
> > The car had done 140k miles and it was still on it's old leads and
> > injectors. So these were the first things to address.
> >
> >
> > talbir
> >
> >
> > >From: "Dick Spellman" <spell.yy at verizon.net>
> > >Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
> > >To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
> > >Subject: Re: [W126 Coupe] Hesitance on driving
> > >Date: Tue, 09 Aug 2005 10:43:42 -0400
> > >
> > >Hi Talbir:
> > >
> > >You don't say if this problem existed before doing the work specified 
>or
>if
> > >it has appeared immediately after the work???
> > >
> > >Regards,
> > >
> > >Dick
> > >----- Original Message -----
> > >From: "Sharan Bains" <sharanbains at hotmail.com>
> > >To: <mbcoupes at mbcoupes.com>
> > >Sent: Tuesday, August 09, 2005 9:53 AM
> > >Subject: [W126 Coupe] Hesitance on driving
> > >
> > >
> > > > Been working on a friends car - 560SEC Euro.
> > > >
> > > > New HT leads, dizzy cap, rotor and new injectors.
> > > >
> > > > When driving along at 40mph+, constant speed of say 60mph, then 
>there
>is
> > >a
> > > > hesitancy every 2 seconds....it's like someone's gently dabbing the
> > >brake
> > > > for a split second, as there is a deccelerating effect. This 
>hesitancy
> > > > appears at any speed.
> > > >
> > > > I've swapped the coil for a known good one (from my own 560SEC) and
> > >problem
> > > > persists.
> > > >
> > > > It's almost like one of the cylinders is not getting enough delivery
>of
> > >fuel
> > > > (idle is slightly rough too), which suggests a bad fuel distributor.
> > > >
> > > > Any ideas ?
> > > >
> > > >
> > > > talbir
> > > >
> > > >
> > > > The MB Coupes Website!
> > > > W126 SEC Mailing List
> > > > Postings remain property of MB Coupes, L.L.C.
> > > >
> > >
> > >The MB Coupes Website!
> > >W126 SEC Mailing List
> > >Postings remain property of MB Coupes, L.L.C.
> >
> >
> > The MB Coupes Website!
> > W126 SEC Mailing List
> > Postings remain property of MB Coupes, L.L.C.
> >
>
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.