RE: Surging 4kq

[Jim Griffin <JGriff@pobox.com>]

Doyt wrote:

> My mechanic ran electronic tests on all the components of the engine
> management system. It has a new O2 sensor. We swapped parts from
> smooth-running engines (altitude sensor, air intake potentiometer, fuel
> distributor, associated parts). We replaced molded vacuum hoses and found
> and fixed several vacuum leaks. We switched distributor caps, replaced the
> spark plugs, adjusted the CO, and ran it for two weeks on Techron and then
> removed all the injectors and tested the spray patterns.
>
Sounds like you've addressed just about everything... EXCEPT for
replacing the spark plug wires. Before spending more $$$ on a
consultant, try a new set of spark plug wires. I had a similar condition
(hesitation/surging... i.e. a bad driveability problem) and it turned
out to be one bad plug wire. It was replaced and the problem was gone.

A year later, the problem showed up again, and I just figured that the
other plug wires finally gave up. Yep, they did... after replacing the
whole set, I haven't had a problem since.

Plug wires often only last maybe 80k miles before they start to lose it.
If you are over that, and have never changed the plug wires, it's time
to do so.

Hope that helps.
--
                     Jim Griffin
                 ICQ # 1315286
               JGriff@pobox.com
           http://pobox.com/~jgriff
     http://wwp.mirabilis.com/1315286
'92 Audi 100S - '87 VW Quantum Syncro
 "Perception is often stronger than reality!"
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