[W126 Coupe] engine will not rev past 5,000 rpm

[Satish Tummala]

Jim,

Try another ignition coil.  I had this problem when I first got my 119 
engine in my car 4 years ago.  The car wouldn't rev pass 4500-5000rpm 
neither.  I swapped one of the ignition coils with a new one and it fixed 
the problem.  Interestingly, on mine, under full throttle, full load, it 
would top out at 5000 rpm.  Under gentle, linear acceleration to 6250 rpm, 
it wasn't a problem.

Satish

----- Original Message ----- 
From: "Jim Nowak" <jjnowak_32503 at yahoo.com>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Saturday, June 25, 2005 4:53 PM
Subject: Re: [W126 Coupe] engine will not rev past 5,000 rpm


>I changed both fuel pumps last night so we'll see if
> that was the issue.  If not, I may have to switch to
> an EFI system sooner than expected.
>
> Jim
>
>
> --- Mister McGoo <eelploot at hotmail.com> wrote:
>
>
> ---------------------------------
>
> Jim;
>
> I know this is not the same problem as yours, but last
> week, coming to the end of a 2 hour drive, I suddenly
> couldn't rev above about 1500rpm.  I had been driving
> 110-120 Kph and out of the blue, 70 Km/hr was the top
> speed.  And a hill slowed me down to 40 Kph.  No bad
> noises, oil pressure fine, temp fine, perfect idle.
>
> I figured something had crawled under my accelerator
> pedal and died there, but no.
>
> The problem?  The tri-pivot (mounted over the #1
> injector) connecting the accelerator to the throttle
> rod and the cruise servo rod, had seized absolutely
> solidly.  Obviously, so solid it was that a 200lb foot
> on the accelerator pedal couldn't budge it.
>
> When it cooled down (the day was hot, the engine
> compartment was hotter!) I could move the pivot and
> take it apart.  Bizarre!
>
> -Bellamy
>
>
>
>
>
>>From: Jim Nowak <jjnowak_32503 at yahoo.com>
>>Reply-To: Mercedes Coupes Mailing Lists
> <mbcoupes at mbcoupes.com>
>>To: Mercedes Coupes Mailing Lists
> <mbcoupes at mbcoupes.com>
>>Subject: Re: [W126 Coupe] engine will not rev past
> 5,000 rpm
>>Date: Mon, 20 Jun 2005 20:24:40 -0700 (PDT)
>>
>>Does anyone know if a bad throttle position switch
> can
>>hinder the engine in the upper rpm range?  My engine
>>hts a wall at 5,000 rpm and will rev no further.  Any
>>ideas?  How do you test the TPS to make sure it is
>>working properly?
>>
>>
>>Jim
>>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.
>
>