Onthe1

I have a 1989 v8 Ford f-150 5.8 XLT Lariat. Starts like a champ, when it idles down is begins to run rough but make it to the highway for a 30 minute drive and runs pretty smooth. Once I get off the high way and hit a light, stop sign or parking spot it completely dies and shuts off... No power steering is tough.

When I try to restart, the engine turns over real slow. I try this multiple times for 5 minutes then it starts right up again and it will stall out at the next light, etc. if I make it to the highway I can drive another 30 minutes home. Please see my YouTube videos of the issues.



I have replace the fuel regulator, filter and pump, o2 sensor, plugs, wires, cap.

No luck, please help.

Thanks,
Luke

cvorden

Disconnect your throttle Position Sensor lead, see if it changes or almost stalls out. Mine was doing that and it was also hard to start sometimes because it was not releasing the compression in the engine making it hard for the starter to turn over. Put a new TPS in mine and she ran smooth as glass.

Onthe1

I replaced the IAC yesterday with no luck. I will try the TPS next. Thanks.

Onthe1

Replaced the TPS, no luck. Now stalling while cool just after a cold start, about 5 minutes of running in the driveway.

Forge-World-FORD

Not familiar with that gen but is it possible to pull codes from it? If so I would do that just to see if it tells you anything.

Onthe1

Key on engine off code: 34

Key on engine running codes: 43, 44, 34, 18

Does anyone know what these mean?

Forge-World-FORD

http://www.troublecodes.net/ford/