[W126 Coupe] Hesitation while driving

[Sean]

Ok . Thanks for all the imput but this did not work either.

  notice that even though the fuel pump is quiet. I hear it change  
pitch of sound every 1sec or 2. It goes higher pitched. My general  
thought was that a pump would just up and stop?? Or am I wrong in  
thinking this? Could it be that it is giving fuel pressure but at time  
hesitating ?? Ordered new pump. Waiting. Did I waste my money??

Sean

On Apr 26, 2010, at 5:28 PM, Dan Landiss <dan at landiss.com> wrote:


> Lacking the official meter, this works well:

> <http://landiss.com/mixture.htm>

>

> on 4/26/2010 10:04 AM Richard K. Hallberg wrote:

>> +1 on Mike's comment.  My 91 sec was intermittently stumbling and  

>> would quit several times at cold start and before it reached  

>> operating temp, would miss but not fail as the revs were up.   

>> Everything settled at operating temp.  I cleaned the cold start  

>> valve till I was blue in the face and reseated the FPR - nothing  

>> seemed to help.  Jonothan, last Friday, adjusted the lambda with a  

>> Merc meter, Mike's 3mm allen, and now there are no stumbling  

>> problems or missing and improved power.

>

> -- 

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