[W126 Coupe] Slight miss-fire at idle

[Demetre at Eurospec]

hey buddy could be a number of things like bad distributor cap and rotor and 
plugs so open the cap check rotor clean tip if burnt with sand paper 
,replace plugs with oem plugs ,check wires . Or shoot some fuel injector 
cleaner and just drive it ,check fuel filter might be plugged from rust in 
tank,if you need any parts i stock used parts but let me no how it goes best 
regards demetre
----- Original Message ----- 
From: "Eddie" <cyberdrakon at hotmail.com>
To: "'Mercedes Coupes Mailing Lists'" <mbcoupes at mbcoupes.com>
Sent: Thursday, March 02, 2006 6:02 PM
Subject: RE: [W126 Coupe] Slight miss-fire at idle


> Well, actually, the O-rings DO fail independently....why not try them, and
> save $100?  It's easy to swap.
>
> Eddie
>
> -----Original Message-----
> From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
> On Behalf Of mavris2 at comcast.net
> Sent: Thursday, March 02, 2006 3:48 PM
> To: Mercedes Coupes Mailing Lists
> Subject: [W126 Coupe] Slight miss-fire at idle
>
> "I noticed that I have a fuel leak
> around the o-rings on the altitude box that attaches to the fuel dist,
> would that cause the misfire? Also I have bosch 4 platinum plugs in it,
> should I switch them?
>
> I had the same problem in my sel.  You have to replace the entire E.H.A.
> Valve
> which comes with new O-ring, and two screws. Its very simply to change.
> Trust me getting new rings wont solve the problem. When they go bad the 
> leak
>
> internaly.  Anyway, I too was runing +4.  Nope they were ok for a couple
> thousland miles then the slight miss started.  Switched back to oem plugs
> and new EHA and poof miss gone !
>
> Jason
>
> ----- Original Message ----- 
> From: "Pavel" <zhur0002 at umn.edu>
> To: <mbcoupes at mbcoupes.com>
> Sent: Thursday, March 02, 2006 3:33 PM
> Subject: [W126 Coupe] Slight miss-fire at idle
>
>
>> My 560 sel has been in storage for winter since last october.  I have
>> started it for the first time yesterday to charge up the bat and let it
>> clean itself out a little. It started good but has a slight missfire when
>> in drive or just idling.  The car has just been overhauled completely
>> about
>> 3k miles ago and I just had it running perfect before I put it away. It
>> has
>> new injectors, euro heads, euro camshafts, euro exhaust manifolds, plug
>> wires, dist rotor, distributor cap and a 3.47 rear end.
>> Anyways when it first started it idled high about 1100rpm then after 
>> 30sec
>> it would start to idle inconsistent would go from 1100rpm to 700 rpm and
>> back up to 1100rpm.  It did that for about 10 minutes and then it leveled
>> out at 700rpm with a slight missfire every few seconds(almost seems like 
>> a
>> vacuum leak but I could not spot one).  I noticed that I have a fuel leak
>> around the o-rings on the altitude box that attaches to the fuel dist,
>> would that cause the missfire?  Also I have bosch 4 platinum plugs in it,
>> should I switch them?  It ran fine with them before.
>> Another strange thing it was doing was, if you rew it up and let of the
>> gas
>> quickly it rews down and than stops at 1000rpm for about 10seconds and
>> then
>> goes to 700rpm.
>>
>> PS.  I aslo stabilized the full tank of fuel in it before i put it away.
>> So
>> I'm sure it has good gas. Again it is very slight misfire, but when you
>> sit
>> inside the car you can feel the engine running, and that is making me 
>> very
>> irritated.
>> Pavel
>>
>> The MB Coupes Website!
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>>
>
>
> 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.