"dalemstevens" <fathompin@[EMAIL PROTECTED]
> wrote in message
news:d6e1233f-8060-48dd-ab20-6e2a33fc9af8@[EMAIL PROTECTED]
> I am going to help my friend tomorrow, we have two different service
> manuals and hope to check out sensors and find one that may be at
> fault. The spark advance is controlled by a TFI electronic control (I
> replied initially to this posting that fact, but it never showed up),
> and I've read that it can have problems with heat. I plan to try
> quick cool, etc to isolate. What my friend has told me is that the
> car does run fine for about 5 minutes when cold. Fine, but why would
> problems with TFI getting hot, be apparent only at low RPM, what would
> be the symptoms be for a heat failing TFI - no spark advance at all-?
> How would it work fine at higher RPM and not low RPM if TFI is
> failing? It would seem to me that something is giving the computer
> control module band info at for low RPM and I will be checking the TPS
> for one. Any other suggestions, opinions is appreciated.
>
> Thanks
When the TFI overheated on my '89 four-banger, it would usually just
suddenly and instantly shut the car down. More often, it would not allow a
restart of a warmed-up engine, until it had had a half hour or so to cool
down. This doesn't sound like your problem.
I would take Jim C's approach and start first by cleaning the air intake
passages. The MAF sensor and idle air bypass are both easy enough to clean
out (probably a LOT of gunk in that IAB, if it's never been touched).
See http://www.muscularmustangs.com/iac.php
for a pretty good overview.
dwight
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