My 1994 Ford F150 4.9 randomly cuts off while driving or in neutral in driveway. How do I fix this?

90

Asked by Nov 10, 2013 at 08:49 AM about the Ford F-150

Question type: Maintenance & Repair

I have had a fuel pressure test done and
negative result. I tested tfi module to find
out that's fine. I replaced distributor cap,
plugs and wire and button in dis
cap...whenit

16 Answers

1,505

Check battery altenator and throttle positions sensors

1 people found this helpful.
90

Just put new alternator and battery in 3 months ago but I will check throttle position sensors first. Thank you for tip

1 people found this helpful.
113,815

Have you had the codes checked? It still sounds like an ignition system intermittent problem. If there is an IDM code then replace the distributor pickup coil and the ignition module.

90

The code will only show if it stalls while hooked up I think.I repaced ignition switch.had fuelpressure test done.replaced plugs wires and dis cap.still stalls.the stalling happens everyday but is random with no shaking or chugging. Truck runs great till it stalls. Then you have to wait 2 to 10 mins to start again

3 people found this helpful.
90

Oh and I had ignition mod tested it tested fine

113,815

Ford OBD 1 will have a memory that will store a code. You have just described the classic Ford ignition module failure. Did the place you had it tested do a heat stress test on the module?

1 people found this helpful.
90

Not sure but I will find out. I drove a couple miles this morn it was fine got home and let it idle in driveway 2 mins later it stalled. Its a 60 dollar part so I will take it back and have it done again

90

Tennisshoes as far as test goes he said he tested it 4 times to make sure it warmed up and its fine. But I don't know if that Qualifies as heat stress test

90

If anybody is out there I replaced ignition module. Egr valve position sensor. Throttle body pos sensor. Now I have check engine light and still no luck with fixing stalling problem..Does anyone have any more ideas. GOING CRAZY!!!

1 people found this helpful.
113,815

The only thing I can think of now is the distributor pick up coil going open when it gets hot.

1 people found this helpful.
90

Ok tennis. I had a ford guy tell me the iac valve after I told him everything I've done but he did sound surprised when I told him I hadn't changed coil yet. So today is change iac change out coil and cross fingers.haaa will report back after. Thank you sir!

1 people found this helpful.
90

No luck. All these things I've done haven't worked, but I'm not crazy anymore I just can't stop laughing..

113,815

Ok try this: Buy a test light an LED is the preferred for this test but a normal one will work, run vehicle until it fails, immediately unplug the coil and put in the test light in it's place and crank engine and watch for a flashing light while cranking, if no light then the ignition module is still suspect, if you have a flashing light then coil is suspect. You may have to be this a few times just make sure.

2 people found this helpful.
90

Thanks tennis I will check this out.

90

Ok tennis my pip circuit in distributor was bad...So I replaced my distributor because circuit is in it..no more stalling.Thanks for yoyr help!

2 people found this helpful.
90

Oh and oreillys was the only place I could find that had the obd1 to test my old truck..would have saved me time and money if I knew that at beginning.

1 people found this helpful.

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