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I've an 89' F-150/302ci/5speed

Tiny
JCONNER
  • MEMBER
  • 1989 FORD F-150
  • 80,000 MILES
I've an 89' F-150/302ci/5speed. Have replaced plugs, wires, distributor, ignition module among other parts. It'll crank and run as good as one could ask, once getting on up to temp it'll miss, backfire and die. I've chased fuel and fire, i'm leaning on fire however. No sign when it's coming, no "check engine" light? Any ideas?
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Tuesday, November 6th, 2012 AT 1:47 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuelpressure and check ignition system for high resisteance, specifically picju coil in dist.
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Tuesday, November 6th, 2012 AT 1:56 PM
Tiny
JCONNER
  • MEMBER
  • 1 POST
Thanks! What would call hi resis / what's normal, 5 50ohms?
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Wednesday, November 7th, 2012 AT 12:09 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I don'th ave that info but normally it ranges 600-800 ohms. Butyou could alsways check against a new one at an auto parts store.
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Wednesday, November 7th, 2012 AT 1:46 PM

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