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Old August 27th, 2008, 02:37 PM   #1
Never_Evil
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Default 1993 4.9L Stall and hesitation

Ok you 6'ers let me know what you got for info. I recent purchased a 1993 f150 with the 4.9 and auto tranny 4x4 for the trail. Drove it 63 miles of a 67 mile trip and all of sudden loss of power and eventually a stall. A little patience and coaxing I was able to limp it to camp. Replaced the fuel filter and checked the TPS, tests same as new part. I did notice a horrible fuel Milage, a half tank got me 60 miles and that was a 19 gallon tank so that is around 6 miles to the gallon

Here is more info on the stall, It will gradually lose power kind of spit and sputter and either run in a limp survival mode or die. I can pump the throttle, hold it to the floor or leave it alone, there is absolutely NO CHANGE in RPM or power.

There is 183K miles on the engine, oil level is full and still have 2000 miles left before next change. Oil pressure showed constant and good. Replaced ignition coil with a known good one. It is a NON mass air engine, there is no grey ignition module on the distributor

I want to have fun with this truck and it may be made a daily driver soon because we are trying to sell a vehicle. Thanks for any hints and help.

Dennis
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Old August 27th, 2008, 02:54 PM   #2
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catylitic convertor?
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Old August 27th, 2008, 11:38 PM   #3
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Oh yeah forgot that part, the former owner gutted it and left it wide open and I threw a patch panel over the top of it. So its not a clogged exhaust at all.

It is also not throwing any check engine codes on the OBD I system.
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Old August 28th, 2008, 11:17 PM   #4
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does the truck have dual fuel tanks...... check fuel pressure, almost sounds like when pump gets hot or warms up it looses pressure maybe? ........... and the 4.9 is a good motor but they are not known for good fuel mileage by any means
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Old August 30th, 2008, 12:23 AM   #5
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I used to get around 20 on my 88 truck. A newer engine should not be getting 6. I will check that, I hope its not the pump.
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Old September 2nd, 2008, 11:52 AM   #6
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Quote:
Originally Posted by Never_Evil View Post
It is a NON mass air engine, there is no grey ignition module on the distributor
are you referring to the TFI module? It is either on the distributor, has an extension of the harness and mounted on the cowl or fender area on a big heatsink, or someone tried to convert it.

All the EFI Sixes had the TFI.

Also check the O-sensors.
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Old September 2nd, 2008, 10:48 PM   #7
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The problem may be the front fuel tank fuel pump. Drove it up to the destination, around, and back and no problems with the truck shutting down. The front fuel pump may be on it way out. I averaged 10 miles to the gallon for the whole trip.....that sux, but for an offroader its fairly good. Time to slap a plow on it and get ready for the winter.
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Old September 18th, 2008, 03:23 PM   #8
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I have the same truck and motor. The First thing I would do would be change the Plugs, Cap and Rotor. Then I would clean the Throttle body and the IAC (idle air control valve) it sits on top of the TB. You should be getting at least 13mpg
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