Even my mechanic is baffled

[David Kavanagh]

How is the MAF? If it is giving low output, you'll run lean and could
get misfires more easily. Also, running "good" gas? When my MAF was
readying very low, I'd get really bad running with '89 octane, I'd
need 91 or better to have it run decently.

David

PS. the output can be tested by reading block 002 or 003 while
accelerating full throttle up to red-line in 2nd gear. The max output
should be 80% or rated HP (so, on your car is 170hp, right? Then you
should see about 136 m/s on the MAF For more info on this. search on
the VAG-COM forum on vwvortex. Andy from Ross-Tech did a more detailed
writeup on this test.




On Sat, 15 Jan 2005 00:30:46 -0800, Michael McLaughlin <mcloffs at mac.com> wrote:
> I posed a question last weekend regarding the check engine light on my
> '99.5 A4 Avant 1.8T. To recap: it came on and the engine ran really
> roughly because of a misfire. I replaced the ignition control module
> which solved most of the misfiring, and the car got me back home (300
> miles from where I was at the time) with no problems, even though
> sometimes there was still a slight misfire.
> 
> Last week my mechanic took a look at the car. Pulling the codes
> confirmed that there was still a misfire on cylinder No. 2. He changed
> out the ignition control module again and tested the coilpacks and even
> swapped them around; still the misfire. After replacing the spark plug
> the misfire was still there. He even had the fuel injectors tested;
> their spray patterns were good and the misfire was still there.
> 
> He's still wondering why, after testing/replacing all those components,
> there's still a misfire on No. 2. He's doing some more looking into the
> problem, but suggested I ask y'all to see if you have any insight.
> Fortunately the car is driveable; you almost have to try (lug the
> engine around 2,000 RPM) to get it to misfire. But any ideas any of you
> have regarding why my car is still misfiring would be greatly
> appreciated.
> 
> Thanks,
> Mike
> 
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