[urq] Stumble under acceleration @ 4000 rpm

[donald stellmaker]

Hey all - 



Thanks for the responses..............I should have mentioned this is
an MC engined, IA (Ritchie) chipped car.................also if it makes any difference this is
something that happens under 'harder' acceleration, if I hesitate a stitch prior
to 4000 rpm and ease past in it's pretty smooth and only in the top 3
gears (well 3rd and 4th............haven't gotten to go fast enough to
get to 4000 revs in 5th this year yet) 


> From: urq at pacbell.net
> To: urq at audifans.com
> Date: Sun, 12 Apr 2009 12:47:29 -0700
> Subject: Re: [urq] Stumble under acceleration @ 4000 rpm
> 
> 4000 RPM is where the safeties start kicking in ... perhaps you have an
> intermittent signal to the ECU ... perhaps the boost pressure is a bit too
> high (or transducer is flaky) ... perhaps the dizzy is adjusted to the end
> of the range for catching the TDC pin.  
> 
> I'm assuming we're talking about a WX/MAC-02 ... please post what mods you
> have ...
> 
> Steve B
> San Jose, CA (USA)
> 
> -----Original Message-----
> 
> I'm at a loss and any possible sources for culprits would be very
> appreciated.....................smooth to 4000 revs then acceleration gets
> 'bumpy,' doesn't happen in 1st or 2nd..................just had a new clutch
> put in, and the clutch master cylinder replaced but this was happening prior
> to that work...................stumped and getting frustrated.
> 
> Thanks, Donnie 
> 
> 
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