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skipping while accelerating

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Old 06-03-2011, 02:38 PM
MGDA123 MGDA123 is offline
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Question skipping while accelerating

I have a 99 f150 that skips bad on acceleration. I've replaced the plugs, wires and coils, I have also done a throttle body cleaning. My wife has a 2003 f150 and hers did the same thing and when we changed the fuel pump it cleared up. Am i rite in replaceing the pump in mine or is there some place elce I should be looking. Please help it's starting to get expensive.
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Old 06-03-2011, 11:39 PM
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Well you really should find the cause instead of just guessing.
Guessing cost extra money and time before you might get lucky.
Since you have already eliminated the ignition parts with no change; I would be looking at the crank sensor plug seating, the cam position plug seating, relay seating in the fuse panels involving the PCM, harness issues etc.
Seems the issue may be vibration or engine movement sensitive.
The throttle body would not act like this. Good to clean it but not for your issue.
Are there any other noticeable driveability issues such as transmission shifting etc that might be caused by the TPS.
You can get a good idea of the fuel system by testing rail pressure before deciding on dropping the tank for a pump change.
Good luck.
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Old 06-04-2011, 06:15 PM
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danger-ranger93 danger-ranger93 is offline
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Did you mean TPS instead of TSP?
If not, please inform me of what that is. I have a similar issue and its starting to **** me off lol
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Old 06-04-2011, 09:21 PM
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Yes I did. A mis-type. Should be TPS.
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Old 06-04-2011, 10:30 PM
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danger-ranger93 danger-ranger93 is offline
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Not trying to Hi-Jack here but can you clean the TPS on these? I know the one on my 96 you could but I was told by my auto teacher that some had a teflon coating that you coudnt clean with out messing it up.
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Old 06-05-2011, 01:19 AM
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It's the Throttle body coated with Teflon, not the Throttle Position Sensor.
The TPS is a vairable resistor. When the surface is wore, there is nothing you can do but replace it.
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Old 08-17-2011, 08:55 AM
MGDA123 MGDA123 is offline
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I thank everyone that has helped me figure out this problem. It is fixed but the problem is I don't know what I did to fix it. I had an old throttle body on the shelf and i replaced mine with it along with another set of new plugs and a new coil pack and whatever it was it seems to have fixed it. Thanks again.
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