Question about 1983 Ford F150

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302 v8 not firing on 2 cylinders

Cylinders are getting spark but not firing. the plugs are badly fouled with black nearly moist gunk. truck smokes some, More the longer it sits idling.

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  • angryvamp Jul 20, 2009

    no smoke on startup, after a min or so it starts smoking and gets worse the longer it idles. It does smoke moderatly on acceleration as well. I was hoping for possibly a flat cam but the smoke itself is what makes me doubt it's that simple. There is also no abnormal noise in the engine (ticking/knocking) if that may be relevant.

  • Ned C Cook
    Ned C Cook May 11, 2010

    Oil is getting into the cylinders. Do a compression test on all four ho;es on that side for comparison and hopefully you don't have a ring problem. There is the poossibility of worn valve guides but cjeck the cylinders first. Did it smoke and when .Accelerating, decel,idle, or on start up? Makes a difference in diagnosing.

  • Anonymous Mar 16, 2014

    wont idle and black smoke and spark plugs are black

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  • Ford Master
  • 14,036 Answers

Do a compression test.sound like your engine piston rings and valve guides are worn out.

Posted on Jul 20, 2009

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FIRING ORDERS NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement. If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired. Fig. 1: 300 cid (4.9L) inline six-cylinder engines Firing order: 1-5-3-6-2-4 Distributor rotation: Clockwise 85762008.gif
Fig. 2: 232 cid (3.8L) V6 engine Firing order: 1-4-2-5-3-6 Distributor rotation: Counterclockwise 85762006.gif
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