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post #1 of 11 (permalink) Old 04-23-19, 06:12 AM Thread Starter
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94 f150 acceleration problem

Okay so for a good while now my truck has been having a problem with acceleration. If I go to accelerate quickly from a stop the entire truck will shake very violently while going practically no where and will not stop shaking until I let my foot off of the gas and then very slowly ease back onto it. Another thing that I believe is related to the same issue is that let's say I'm at 20mph. If I go to accelerate from 20 to 50, it will accelerate at the same speed whether I floor it or slowly ease onto the gas. I don't know too much about vehicles. My dad says that it probably has something to do with the amount of fuel that is being let into the engine but he isn't sure. Any help is appreciated. Thank you all so much.

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post #2 of 11 (permalink) Old 04-23-19, 08:04 AM
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Re: 94 f150 acceleration problem

Try this and see what you get KOEO (Key on engine off) and KOEO (Key on engine running)

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post #3 of 11 (permalink) Old 05-21-19, 04:27 PM Thread Starter
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Try this and see what you get KOEO (Key on engine off) and KOEO (Key on engine running)
I did a koer test and all that came up was knock sensor
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post #4 of 11 (permalink) Old 05-21-19, 06:33 PM
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Re: 94 f150 acceleration problem

Check the vacuum at idle and raise the RPM to 2000 and see what the reading does. It should drop and raise back up almost the same as at idle.

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post #5 of 11 (permalink) Old 05-22-19, 03:22 AM
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Re: 94 f150 acceleration problem

If manual trans , suspect clutch slip . If auto trans scan it for fault codes .Really have to find if engine or transmission problem .
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post #6 of 11 (permalink) Old 05-22-19, 10:45 AM Thread Starter
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If manual trans , suspect clutch slip . If auto trans scan it for fault codes .Really have to find if engine or transmission problem .
How do I go about doing this? With just a EEC scanner?
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post #7 of 11 (permalink) Old 05-22-19, 10:47 AM Thread Starter
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Check the vacuum at idle and raise the RPM to 2000 and see what the reading does. It should drop and raise back up almost the same as at idle.
I dont have an rpm gauge but from listening to it, it sounds like it goes back to idle just fine. But for some reason when I start the truck and it idles, it spits and sputters but the moment I put it into drive and start driving, it won't spit and sputter anymore until I turn it off
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post #8 of 11 (permalink) Old 05-22-19, 12:30 PM
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Re: 94 f150 acceleration problem

With the further info about spits and sputters I would check for vacuum leaks . SOME trans had a vacuum modulator on the side of the box which could fail or the vac hose could leak / come off . Might / might not apply to your vehicle. With " the entire truck will shake very violently " I would be checking the engine mounts and driveshaft , plus centre mount . Another thing you could check would be the ignition timing .

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post #9 of 11 (permalink) Old 05-23-19, 06:55 AM
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Re: 94 f150 acceleration problem

Thmdo, your trouble descriptions are little confusing, if not contradictory. Are you saying the problem is intermittent?
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post #10 of 11 (permalink) Old 05-23-19, 11:36 AM
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Re: 94 f150 acceleration problem

Have you checked the basics, especially the fuel filter?
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