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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 08-11-2011, 11:25 PM
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hesitation/cutting out under acceleration??

Hey guys..I have a 91 f150 300 6....truck has been hesitating and cutting and almost shutting off out when taking off from a stop and then will take off and will run fine the rest of the time... its getting pretty bad as its doiing it everytime i go from a stop?

would a bad fuel pump do this?

or is it something else?
thanks
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Old 08-12-2011, 02:45 AM
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Mmm, TPS most likely, my trucks bucks up a storm from a stop all the way to a little past 2000 rpms. I hate it, everyone on the site has told me it's the TPS, I just haven't got the time or money right now to fix.

Good luck, and hope you get your answer.
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Old 08-12-2011, 02:46 PM
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thanks for the reply! what exactly is the tps? and how do i fix it?
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Old 08-12-2011, 02:53 PM
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It's the Throttle Position Sensor, it tells your computer how much gas the truck needs based on how much throttle you give.

Also I'm guessing it's an EFI F150 right? Or is it carbed?

If it's carbed, then it could mean the carb needs to be rebuilt, or a faulty fuel pump.

There is a slight chance it could be because you have low fuel pressure, so I would check that before looking into the TPS.

Umm, as far as fixing it, I don't think you can, you just have to replace it.

Check out this link, it's about the symptoms we have, it's from FTE members.
http://www.ford-trucks.com/forums/14...-cruising.html
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Old 08-12-2011, 02:56 PM
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The throttle position sensor is actually what keeps a vehicle from stalling out when coming from a stop by injecting a little bit more fuel. You can pick a new one up for about 40 bucks. It doesn't take very long to replace.
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Old 08-12-2011, 03:00 PM
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Yes, GNR22 said something I forgot. Great job, hopefully he can fix/pinpoint his problem now.

I know it's my TPS, just don't have time. Also whenever I do access the throttle body to get to the TPS, I'm going to try to clean everything.

Well Ravens Fan, hope we helped. Good luck.
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Old 08-12-2011, 11:37 PM
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thanks guys that did help i will try to do a fuel pressure test but im having a feeling it is the tps and yes it is efi
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Old 08-14-2011, 04:09 PM
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i'd agree and assume it's the TPS. i just had the same problem that flared up a few weeks back and got worse until unbearable. at first it was my temp coolant sensor causing the engine to think it was running hot, but it wasn't. after doing that 5 min fix, the CEL was still on and the problem persisted. long story short, my buddy came by and read the computer, went and got the TPS, and replaced it. since then, i haven't felt the bog down that was there before. when you do replace it, take your time and remove the throttle body (and replace its gasket while you're at it) to make the install easier.
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Old 08-14-2011, 04:09 PM
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2005, 300, 460, acceleration, cherokee, cuts, cutting, f150, f250, ford, heavy, hesitates, hesitation, load, propane

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