bucking when hot

[SJ]

> From: "Kaasler, Ingvar" <ikaasler at CBS.com>
> Subject: bucking when hot
>
> My 89 200TQ has begun to buck when the car is warmed up and under load,
such
> as taking off from a stop heading up hill. Cruising there is no problem.
> This only happens when the car has warmed up. I've replaced the following
> items: fuel injectors and inserts; distributor cap, rotor, wires; all
vacuum
> hoses; fuel filter, fuel pump, FP relay is OK; temp senders for ECU and
Idle
> circuit,
**** Did you have bucking before you replaced these parts? Or, do you have
bucking after replacing the parts?
Did you replace the plugs?
If the problem occurred after you changed the parts, the new part can be
defective . . usually the plug wires. Put the old ones back in and test.

Usually, bucking is associated with no spark at a cylinder . .missed spark.
And it bucks under load because resistance to electrical current at the
spark gap increases under load. I wrote about this a while back - - google
search cannot find that article in the archives.
I looked in my files and bactracked the article.
Re: What the hell did I blow up this time? Lousy spark at higher pressures >
Paschen's Law

http://www.audifans.com/pipermail/quattro/2002-October/064828.html

Maybe somebody can explain why a Google search for "Paschen's" on the
audifans site( http://www.audifans.com/ ) does not bring up this article.



SJ
85 Dodge PU, D-250, 318, auto
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q



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