1990 F150 5.0 4X4 starts then dies - Ford Truck Enthusiasts Forums



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1990 F150 5.0 4X4 starts then dies

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Old 10-02-2012, 10:09 PM
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1990 F150 5.0 4X4 starts then dies

Just bought this truck and I inherited this problem. It will turn over, it will start (sorta) and then dies. If you pump the pedal, you can keep it running, but very badly. I have verified fuel and pressure to the rail and I have spark. New TPS, fuel filter, fuel pressure regulator, dist cap and rotor. If I turn the key and let the fuel pump prime a few times it acts like it wants to run but after a few revs of running it dies.
Any help would be very appreciated...as I am not having fun.
Bob
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Old 10-02-2012, 10:16 PM
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First thing you need to do is pull the engine trouble codes and post them. Knid of sounds like it may be the idle air control valve is part of the problem, but if you pull the codes it will help greatly in determining the problem

Matt
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Old 10-02-2012, 10:29 PM
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Matt, the codes were 22 63 & 47. At the time, I had the TPS off of the truck and I assume that was the reason for the 63 code. I installed a new one with no results on the issue. Will the MAP sensor cause those symptons?
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Old 10-02-2012, 10:42 PM
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Yes I beleive it will, you also have an O2 sensor codeaccording to the chart I looked at, so the computer is thoroughly confused by the bad readings of the MAP and O2

matt
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Old 10-02-2012, 10:46 PM
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Well, I'm going to cross my greasy fingers and throw a MAP sensor and 02 sensor at it and hope it will run tomorrow. I appreciate the fast reply Matt and I'll post the results.
Bob
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Old 10-02-2012, 10:52 PM
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Pull the codes again before you buy the parts and make sure they are consistant since you changes the TPS. O2 sensors are relatively cheap and it can't hurt to put a known good one on, same with the MAp

Matt
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Old 10-02-2012, 10:54 PM
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Will do and thanks again.
Bob
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Old 10-03-2012, 06:05 PM
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That was it. The MAP sensor was bad. I also installed an 02 sensor and my codes are clear. Matt, thank you very much for the help and direction.
Bob
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