My girlfriend's bucking problem

[rob hod]

    Whats being said here rings true with me. I had the 'bucking' problem
with my 87 CGT. It was quite imtermittant but quite violent when it happened
when opening the throttle at low speeds in a high gear.

    I also had a rather lumpy idle. I was beginning to fear bad things
wrong.

    Both were cured with a new set of plugs!. Obviously one plug was near to
useless, whereas its fellows were just worn.

    All plugs worked ok in a visual check, which goes to show how useless
that check is. How the plug behaves when screwed into the engine may be very
different. (very much worse).


rob
----- Original Message ----- > Date: Thu, 15 Nov 2001 16:14:54 -0500
> From: "S. Jaworski" <syljay at optonline.net>
> Subject: Re: My girlfriend's bucking problem
> To: quattro at audifans.com
> Cc: sholman at ppg.com
>
>
> Quite often, the problem is an ignition wire. The defective wire will most
> often fail to deliver the spark when engine is under load. When idling,
wire
> works ok. The bucking is caused by one or more cylinders dropping out,
then
> coming back on.
>
> I havent figured out why that happens. I think it has to do with
> conductivity changes at the spark plug gap. Although one would think that
a
> richer compressed air/fuel mixture would conduct more than leaner air/fuel
> mixture. Maybe Phil has the theory on why this happens.
>
> At any rate, I've had this happen about 3 times on my cars. The first time
> on my 85 4000s . . 10 days after I bought it new! One ignition wire
wouldnt
> fire right under load. Sometimes it would work, sometimes it would'nt.
>
> If the wires are more than 5 years old, I would consider changing the
> distributor cap, rotor, and ignition wires just on general principles.
>
> While you are playing there . . disassemble the grounds in the back of the
> engine, clean them, then reassemble. Bad grounds do strange things also.
>
> Syl
> 88 5kq
> 90 100q
>
>
> <......It typically occurs when starting out from a stop, but =
> has recently occurred at highway speeds......>
>