[W126 Coupe] Hesitation while driving

[Dick Spellman]

On 4/25/2010 7:16 PM, Sean wrote:

> Yep only under load. I dumped some gas into it before bolting it up. 

> The hesitation only happens under load you are correct, that's why I 

> am so perplexed. I read on mb forumrs it might be the icv????  Idle 

> contol valve next to ditributor?  But it idles stars and revs perfect. 

> Just when driving. Still acts like the filter is clogged.

Sean, do the simple checks first.  When done with the electrics, check 
for a vac leak as Jonathan suggested in earlier post.  Could try jumping 
with 14ga. the fuel pump relay and test drive.  Remove jumper 
immediately after the test run.  If no hesitation it's the fuel pump 
relay.  If hesitation persists you will need to start drilling deeper 
with tests for fuel pressure and electrics as per the manual.

-\Dick