89 2.9l once warm will not restart. Mass air flow sensor? - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 01-28-2016
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89 2.9l once warm will not restart. Mass air flow sensor?

Once the engine is started and the engine warms up, if you turn off the engine it will not restart. Dealer said mass air flow sensor but I cant find it!
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Old 01-28-2016
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Thats because it doesn't have one.

1989 uses a speed density system with MAP sensor, but MAF or MAP wouldn't cause your issue.

Dealer??

Hope it wasn't a car dealer with that kind of advice, card dealer, antiques dealer maybe :)

Anyway your 1989 2.9l engine will have a TFI ignition system, one of the more common issues with these as they got older was a no start after engine was warned up.

Read here: Ford EEC-IV/TFI-IV Electronic Engine Control Troubleshooting

Usually you need to replace the module on the distributor.
One thing another fellow did was to carry a bag of ice, after warm up and no restart he put the bag of ice on the TFI module, and let it sit there for a minute or so.
Engine started right up, normally he said it took at least 10-15 minutes before it would start again.
He replaced module and all was good after that
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Old 01-28-2016
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Thanks

After looking in a number of places I thought maybe this didnt have a mass air sensor. I will check the TFI.

It was a ford dealer and supposedly had 25 years experience. I didnt want to spend the $400 to have it replaced. Glad I didnt.
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Old 01-28-2016
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Maybe he meant there were 25 guys with 1 year experience, each, lol.

MAF sensor could be removed and engine would still start, same with MAP.

No start is the big 3
spark
fuel
compression

And cold vs warm is usually electrical, not always but best place to start.
Coils can also overheat which would be the next thing to check after TFI module
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Old 01-28-2016
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I had a 4.0 doing the same thing not sure the 89 will have it but the temp senor for the ecm was bad. I replace it and its beem doing fine ever since
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