[Vwdiesel] Strange IP Problem

[James Hansen]

Hmm.
motor is well grounded?
-James

Val Christian wrote:
>> In a message dated 8/22/2006 9:03:33 PM Pacific Daylight Time, 
>> val at mongobird.com writes:
>>
>>> It's happened a couple of times, usually shifting from 1st to 2nd.
>>> Shift into 2 (or 4th), and power drops to idle.  Foot pedal is not
>>> responsive with car in gear, and car slows down.  Push in clutch,
>>> and rapidly operate the foot pedal, and things get better right 
>>> away.
>>>
>>> The idle power is smooth, with no roughness.
>>>
>>> IP crowd, any ideas?
>>>
>>> Val
>>>
>>   Sounds like air in the fuel line.  Is there a kink or crack 
>> in the IP supply line that will allow air in when the engine 
>> rocks one way or the other?
>>   If it's a top-of-the-tank pickup setup (instead of a fitting on 
>> the bottom) maybe there's a leak in the tube going down, 
>> letting air in as the fuel sloshes between shifts?
>>      Loren
> 
> A fuel flow appears to be great everytime I can check it.  There are no bubbles
> of any consequence in the IP feed line.  There are no signs of marginalized
> fuel flow, as the car is frequently driven at 80 MPH, with AC, which 
> pretty much assures that the power is at about 65% or higher.
> 
> The problem seems to mostly happen between first and second gear, and
> on level ground.  Repeating the shift sequence going up or down hill
> doesn't seem to increase the failure rate.  It happened once on a 3 to 
> 4 shift.
> 
> Releasing the clutch, and reving the engine once, clears the problem.
> When it gets into this modality, it idles smoothly.  In every other respect
> the engine appears to work OK, and developes power and RPM OK.  
> 
> A starved IP was a suspicion, but has not been supported by any observation.
> 
> Val
> 
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