1986 Ford F-150 idle up idle down, backfiring

  • 1986 FORD F-150
Engine Performance problem
1986 Ford F150 V8 Two Wheel Drive Automatic over miles

i change cap, roto, plug&wires
Do you
have the same problem?
Saturday, February 6th, 2010 AT 2:13 PM

1 Reply

Hi there!
If the problem started after you did the service on the vehicle, you might have done one of two things:
_you removed all the cables at the same time and while you put them back you skipped one position.
To ensure you did it right simply remove spark plug number 1 and bring the engine to top dead center, then remove the ignition cover to view the position on the rotor (it should be next to the cover fastener) next make sure the cable coming out from this position goes to plug number 1.

_or you reversed the firing order by mistake (this might happen if you are used to work in General Motor vehicles)
To ensure your cables are positioned to the same direction the rotor spins, you should remove the ignition cap and crank the engine using a remote switch. Rearrange if needed.

If the problem started before the service that you performed, you should troubleshoot the throttle position sensor (TPS). The TPS is located under the throttle body by two small screws. This sensor has to be positioned in a very specific manner, if you don't pay attention when you take it appart the symptoms will continue after you have replaced it.
I hope that this will solve your problem. Keep riding on blue ovals!
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Saturday, February 6th, 2010 AT 11:16 PM

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