1995 Ford F150 starts but acts like it runs on 1 or 2 cylinders?
It either dies after a several seconds or it idles smoothly after several seconds. Pushing the gas pedal does nothing. Wtf is this?
Sounds like a bad TPS but could be other issues or multiple issues depending on how well it's been maintained. Has it been tuned up? Filters changed? Check engine light on? Any trouble codes?
No throttle response is typically caused by a faulty TPS… No readings getting to the PCM as to actual throttle angle/opening. Faulty TPS readings can also affect starting as the computer uses that info to set IACV steps/counts/opening and can cause loping or erratic idle, stalling, no starts, etc.
I'd test the TPS for proper base readings and smooth voltage readings as you open the throttle… If they are erratic in spots or at closed throttle, then replace the TPS. Check for any wiring defects in the circuit too… Loose or corroded connectors, etc.
Do a pressure test of the fuel system… Could also be partly a weak pump, clogged filter, bad pressure reg, etc. Test /replace the MAP sensor as well.
Test or clean the IACV… Idle Air Control Valve. Which can get crudded up over time and not respond to computer inputs which also causes starting or stalling issues. Actually, an older truck like yours will likely need some cleaning of the MAF (if so equipped) and throttle body too which can affect proper airflow/readings. Part stores sell special cleaners for that… Vids or websites show how to clean. Check for any vacuum leaks at hoses, PCV, air intake duct, etc.
http://troubleshootmyvehicle.com/ford/4.9L-5.0L-5.8L/how-to-test-the-tps-1
http://troubleshootmyvehicle.com/ford/4.9L-5.0L-5.8L/how-to-test-the-map-sensor-1
http://easyautodiagnostics.com/ford/4.9L-5.0L-5.8L/maf-sensor-tests-1
There are a lot of things that can cause that. You need a mechanic with a good scan tool to monitor the sensors to make sure they are all with in spec.
Can't see why paul got a thumbs down. Essentially he has made a few valid points. Ideally a garage is best bet as will have access to a diagnostic tester and can more easily check parts /replace etc
sounds more fuel air mix issues than electrics. Have we had fell filter replaced? Have we worked under hood recently? Any water etc that gets into loom connections on harness can play havoc with systems control.
we ought to think about probably a mix of more than one fault EGR sticking? Maf dirty? Etc an even an air leak? Garage can easily test fuel pressure. Air leaks .EGR etc using diagnostic tools and experience .training. Etc
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