Question about 1991 Ford F150

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How can I tell which coil is bad on my 2003 F150?

One of the coils is bad. How do I tell which one?

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Do a spark test be sure to have a spark tester in hand to insure proper spark is firing also old method pull spark plugs if one is wet others bone dry bingo!

Posted on Dec 31, 2008


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crankshaft position sensor is bad. it uses this sensor to tell the computer when to make each plug fire. no signal no fire.

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2003 F150 4.6L V8 Engine has a engine code cylinder # 2 misfire

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My 2003 explorer has 195000 miles, never had a problem.turned it off,sat for about 30 minutes, now it's missing like crazy

sounds like bad coil paks and plugs. if check engine light is on you need the codes and it will tell you which plug and coil pack is bad. auto zone will scan it for free and tell you which plug and coil pack

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I have a ford f150 4 wheel drive I have spark to the coil but noting coming out,

its a bad coil. coils boost the voltage of the spark to make it strong enough to ignite the fuel mixture. you will have no combustion per every cylinder with a bad coil. im pretty sure its electronic ignition on 2004+ 5.4l motors, so its not anything mechanical. if it was the ECM, you'd have no pre-coil voltage either.

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Jan 19, 2010 | 1990 Ford F150

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2002 f150 engine misses after car wash?

Take off the distributor cap and spray some WD-40 in there and on every sensor you may think may have gotten any moisture. Hope you didn't damage any of them. Check the spark plug wires also.

Dec 29, 2009 | 2004 Ford F150

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2003 ford f150 misses at idle starts fine runs fine new fuel filter new o2sensor

One thing to take a look at is the vacuum elbow on the back of the throttle body.

Remove the plastic throttle body cover, and check the vacuum line.

Ignore the IAC notation, this is the only picture I have handy, showing the vac line just above the IAC.


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1 Answer

Ford 2000 F150 engine stumble

A common problem with fords with a coil on plug set up is that the coils go bad. If there is no check engine light on. With the car running unplug one fuel injector at a time and see if the engine stumbles harder. If it does then that coil is good. If you notice no change then that coil is bad. Most of the time to 2 in the back on both side go bad. I would try those first. Let us know how it goes.

Jul 31, 2009 | 2000 Ford F150 Flareside SuperCab

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