1989 F150 4.9 intermittently dies - Ford Truck Enthusiasts Forums



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1989 F150 4.9 intermittently dies

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Old 01-12-2018, 10:22 AM
tnab1970 tnab1970 is offline
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1989 F150 4.9 intermittently dies

OK, guys need some input. 1989 F150 4.9L , 5 speed. New long block, ALL new ignition, not distributor but new PIP sensor. Fuel pumps putting correct pressure at idle. New filters, new in-tank pumps, we have replaced ALOT of parts.Runs great, most all the time. Intermittently when you push in the clutch to come to a intersection, it idles down so low it dies. Always starts right back up. Does not do it every time. Could this be the Throttle Position Sensor? or Idle Air Control ? ( one of the few things we did not replace )
thanks in advance.
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Old 01-12-2018, 10:53 PM
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ROMAD0508 ROMAD0508 is offline
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I was having an issue with a high idle while in park then when in drive the truck would almost die before I gave it gas to get rolling. Ended up being the TPS. That is what I would try.
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Old 01-13-2018, 03:46 PM
tnab1970 tnab1970 is offline
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It does have very high idle when cold. 1200-1400RPM. Ill check TPS
Thanks
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