[Vwdiesel] Strange IP Problem
jhsg at sasktel.net
Thu Aug 24 12:04:45 EDT 2006
Oh. just thinking along the lines of a bad ground to the engine.
A lot of times, when you do something mechanical like push a clutch
pedal and suddenly the thing behaves itself, your ground path has
changed for the better, suddenly all is well, the bucking farting beast
from hell purrs like a kitten and you tear your hair out trying to find it.
Probably not in this case however...
Val Christian wrote:
> Starts OK, charges OK, runs AC OK (inplying good alt output). Why
> do you ask about grounding?
> When it goes in idle mode, it runs smoothly, and never stalls.
>> motor is well grounded?
>> 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
>>>>> The idle power is smooth, with no roughness.
>>>>> IP crowd, any ideas?
>>>> 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?
>>> 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.
>>> Vwdiesel mailing list
>>> Vwdiesel at vwfans.com
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