-Alan
Karl Wolf wrote:
> Just one more piece of data (can't guarantee this, though):
> I mentioned previously that the mechanic had run the air intake hose
> back to the engine block (in search of warmer air). I removed this
> modification and put the original hose back (draws air right in front of
> the radiator). The bucking is instantly worse (at least in cold
> weather...I am waiting for it to warm up).
>
> George Nunez had suggested that the air temp contact on the air flow
> sensor may not be functioning.
>
> Karl
>
> A few post scripts to my previous email:
> 1. Initially, the bucking is under load only (the steeper the
> incline, the worse it gets). As time goes on, bucking happens at other
> times as well.
> 2. Pumping the pedal gets rid of the bucking.
> 3. I tried dry gas and fuel injection cleaner...with no noticeable
> improvement.
>
> Does this get us any closer to a conclusion?
>
> Karl
>
> -----Original Message-----
> From: Steve Coleman [mailto:scoleman@ca.newbridge.com]
> Sent: Monday, January 04, 1999 4:20 AM
> To: Karl Wolf
> Subject: Re: 505 SW8: "Bucking" on the highway
>
> >On a recent trip from NYC to Western PA, our 92 505 SW8 suffered some
> >"bucking". Here are the conditions:
> >
> >Bucking did not start right away...after about 3 hours of driving.
> >Temperatures were fairly warm (35 F) when starting the trip, but
> started
> >to drop with nightfall.
> >Once bucking started, seemed to get worse with travel.
> >Happens whether tank is full, partial, or near empty.
> >On the return trip, bucking was much less...I kept it at about 65 mph.
> >
> >Before you reply, let me "disarm" some red herrings:
>
> >3. Scavenge pump in the tank seems an unlikely suspect: If it were
> >at fault, I would have problems only when below a quarter tank of gas.
> >
>
> Karl,
>
> Last summer I experienced bucking on my 86 505 STI. This only happened
> when
> accelerating (not at continuous moderate to low revs) and was like the
> ingnition being toggled off/on. Like you, I dismissed the in-tank
> scavenger
> pump because I thought with more than half a tank it made no difference.
> However, that is what turned out to be the culprit. I got a replacement
> unit for a Jetta ($79 CDN); but be advised that the polarity is reversed
> on
> the Jetta pump.
>
> Steve Coleman
> Vancouver
>
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