1991 FORD F350 WON'T START

  • Tiny
  • Dragonstormer
  • 1991 FORD F-350

Computer problem
1991 Ford F350 V8 Two Wheel Drive Automatic 230000 miles

Check engine light does not come on when you turn the key on. Engine won't start. Gas is there and spark is there. Engine started to miss while driving. Stopped and engine started to run rougher and then it just stopped. Cranks good but will not start.

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Saturday, November 29th, 2008 AT 6:51 PM

10 Replies

  • Tiny
  • James W.
  • MEMBER

This is a canned question, but I have to ask, ECM and other fuses good? According to your posting, you have fuel pressure and spark. Assuming this is correct, do you have injector pulse? With no check engine light at "key on" and no injector pulse, I would have to say your computer died. Please advise.

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Saturday, November 29th, 2008 AT 8:36 PM
  • Tiny
  • Dragonstormer
  • MEMBER

I took a test light and grounded it. The injector plugs going into the injectors both sides had power. I checked a couple of them all the same.

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Sunday, November 30th, 2008 AT 3:20 PM
  • Tiny
  • James W.
  • MEMBER

Testing both sides of the injector plug while cranking, do you get a pulse from either side? If no, I would change the crankshaft position sensor. Let me know.

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Sunday, November 30th, 2008 AT 7:45 PM
  • Tiny
  • Dragonstormer
  • MEMBER

Hi, I got a pulse on one side. Hooked test light to Positive post on battery.

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Tuesday, December 2nd, 2008 AT 3:45 PM
  • Tiny
  • James W.
  • MEMBER

The computer grounds the injector to fire it. Your teast from the positive battery is correct. But, we are missing something. If you have injector pulse, fuel pressure and spark, it should run or at least try. I would re-check spark at the plugs and fuel pressure at the fuel rail. Let me know.

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Tuesday, December 2nd, 2008 AT 4:36 PM
  • Tiny
  • Dragonstormer
  • MEMBER

Hi, I have 40 lbs fuel pressure and I still have spark. Thanks

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Thursday, December 11th, 2008 AT 12:53 PM
  • Tiny
  • Dragonstormer
  • MEMBER

Hi, I have 40 lbs fuel pressure and I still have spark. Thanks

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Saturday, December 13th, 2008 AT 10:51 AM
  • Tiny
  • James W.
  • MEMBER

I hadn't forgotten you, I had some computer problems for a while.
We're missing something here. Are your plugs wet from repeated start attemps?
Pull the vacuum line off the fuel pressure regulator and see if you have raw fuel in the line. If the diaphram in the FPR has popped, it will send raw fuel into the manifold and flood the motor. Please advise.

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Saturday, December 13th, 2008 AT 11:42 AM
  • Tiny
  • Dragonstormer
  • MEMBER

Hi, I tried that no fuel. Spark plugs dry. I tried starting with ether won't start. Have spark at distributor cap but wasn't getting any spark through wire to spark plug. Replaced wires still won't start. Any idea.

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Thursday, December 25th, 2008 AT 12:28 PM
  • Tiny
  • Dragonstormer
  • MEMBER

Hi, I was getting a spark at distributor cap but not down to the plugs. Plugs are dry. I was not getting a spark through to the spark plugs. I replaced all ignition wires. Still won't start. I checked primary and secondary parts of the coil. Came up within ranges. Went and bought another coil and checked it. Came up with the same readings as the old coil. Replaced coil anyway. It runs now. Yet according to the readings I got the old coil is the same as the new one. Only thing I can think of is it fails when you put a load on it. So if I hadn't replaced it I still would be in the dark. Thanks

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Friday, December 26th, 2008 AT 7:02 PM

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