Say -- I wonder if this might be due to a failed coil?

I ask because the problem surfaced immediately after I did a compression
test. I am not an experienced mechanic. I pulled the coil wire out of the
dizzie and did my testing.

About four days later someone who knows a lot about working on these
engines checked my results with his compression tester. "Always ground the
coil wire," he said. Why? "Because you can damage the coil."

Coincidence? You be the judge.

--
Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR

On 10/21/2007 10:50 AM Geza Polony wrote:

> Mike,
>
> I don't think this has anything to do with the electronic part of your FI
> system. First, if your ken-o-meter is showing good results, that means the
> electronics are working normally. Second, your symptoms are too extreme to
> be caused by a bad sensor or whatever, and the fact that it corrects itself
> soon after starting means the FI system isn't faulty.
>
> This is not really related to temperature, either.
>
> I'm wondering if it could be something in your fuel delivery system, a
> physical clogging of the fuel lines or some other problem that would limit
> fuel pressure/delivery rate during the first 30 seconds or so of operation.
>
> What happens if you start it, then just let it idle for a few minutes? Does
> the problem go away?
>
> Another possibility would be something loose in your cat or muffler creating
> too much back pressure until, after a time, it moves out of the way because
> of vibration  or pressure and allows the exhaust to flow correctly.
>
> In any event, I think this is something physical (not electronic) that
> corrects itself due to engine vibration or exhaust pressure or fuel pressure
> after the first few minutes of operation. It's not going to be a vacuum
> leak, a sensor problem (except possibly a bad connection), or the like, as
> these would not disappear so quickly and with such predictability.
>
> Geza
>