[urq] Stumble under acceleration @ 4000 rpm

[Brandon Rogers]

Hey Donnie-
I would start with intake airtemp sensor first, then fuel pump wiring under
rear seat - you should relay it, then...not sure...

Brandon

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of donald stellmaker
Sent: Sunday, April 12, 2009 5:51 PM
To: urq at pacbell.net; u u
Subject: Re: [urq] Stumble under acceleration @ 4000 rpm



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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