1988 won't run

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Sep 7, 2016 | 12:15 PM

Jpbuttemt

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1988 won't run

I have a 1988 f150 with a 5.0 automatic 4x4. Was driving down the road the other day and it sputtered and died. Acted like it ran out of gas so put a few gallons in and tried it. It started but once the throttle is pressed it dies. It has good fuel pressure stays constant 40-45psi. Truck will idle fine but if I press throttle fast it dies if I bring Rpms up slow it will rev up. Checked spark and it loses spark when the issue occurs. Have replaced the pick up in the distributor and the ignition module still has same problem. Had an ecm out of another truck that I tried and still the same. Also tried a spare coil and map sensor just to see and still the same. Does anyone have any thoughts as to what direction to go? There are no codes I checked with scantool.

Sep 7, 2016 | 04:03 PM

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Hook a multimeter up to the coil +12v connection and see how it behaves when you rev it up. It should have power as long as the key is on.

Sep 8, 2016 | 10:39 AM

Jpbuttemt

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The coil keeps a constant 12v never drops out

Sep 8, 2016 | 01:37 PM

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Do you have a noid light or test light you can hook up to an injector? I'm interested in seeing if you loose injection too.

Sep 8, 2016 | 01:53 PM

Jpbuttemt

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I just put mood light on and the injectors are still trying to fire when it cuts out

Sep 8, 2016 | 01:54 PM

Jpbuttemt

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Noid light not mood ha ha auto correct sucks

Sep 8, 2016 | 04:31 PM

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How are you checking that it loses spark when the issue occurs?

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Sep 8, 2016 | 04:42 PM

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Is it driveable the way it is? Like, if you slowly roll into the throttle is it fine, and then it only dies if you stomp the throttle?

Or does it die once the throttle gets above a certain opening?

Sep 8, 2016 | 05:01 PM

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Jpbuttemt

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It dies anytime you Try to move it but while sitting there can baby the throttle and get the Rpms up

Sep 8, 2016 | 11:20 PM

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Can you pull the SPOUT connector, and see if the behavior is the same?

Sep 9, 2016 | 02:25 PM

#12

Jpbuttemt

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I pulled it out and it dies of you give any throttle at all. Still idles but rough compared to when is plugged in

Sep 10, 2016 | 12:27 AM

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The only thing I can think of is some wiring fault between the distributor and ICM. I would try spraying starting fluid into it when it starts to die to verify loss of spark.