Acceleration Problems with 95 5.8

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Nov 19, 2022 | 01:05 AM

Moses?

Thread Starter

1st Gear

Joined: Nov 2022

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Acceleration Problems with 95 5.8

Hey my everyone I have a 95 5.8 f-150 and need some help with an acceleration problem. So okay when I press the gas's all the way down fast the truck just revs up and doesn't go anywhere and when I let off the gas it bucks and jerks kinda but when I easy into the gas it accelerates perfectly fine does anyone know what the problem might be?

Nov 19, 2022 | 08:10 AM

frankbarnes

Cross-Country

Joined: Sep 2014

Posts: 80

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Just a stab in the dark but it sounds to be like a transmission issue. I’d drop your pan and inspect and change the fluid and change your filter.

Nov 19, 2022 | 08:32 AM

torq'ta 5 8

Lead Driver

Joined: Jan 2019

Posts: 5,086

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From: N.W. Alabama

What if he has a 5 speed, then clutch dying,

or check level if auto, see how low it is, after you drive it and get to operating temp, parked on level ground.

Nov 20, 2022 | 07:30 AM

Hendo337

2nd Gear

Joined: Nov 2022

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Fuel pump

Quote:

Originally Posted by Moses?

I believe your problem is a weak fuel pump, my truck is a 1997 F250HD 5.8 ZF-5 S47, when I am on my rear tank and try to accelerate it acts like what your truck is doing and when I switch to the front tank it takes off and accelerates just fine. The rear fuel pump still works but, it's weak, I am actually changing it right now. I am guessing your truck is the same way. It might get be a fuel filter, I changed mine and it didn't help. Unless you are suffering from those failed modules in the ECU of something like that, it sounds like the fuel pump issue. I have already done a ton of other upgrades to my truck and this was is last thing I will do to it in the current configuration. If I was to go further with performance modifications I would be going to aluminum heads, single plane, big roller cam, headers and a carburetor...I may very do all of that on at least a 393 stroker. If an aftermarket EFI system wasn't so expensive I would go that route however a carburetor will make more power than any factory style performance EFI induction and won't have any issue with tight lobe separation angle cams. Where I live there is no inspection or emissions testing so it doesn't matter. It's just nice to have a 25 year old truck on the road that is robust, paid for and relatively simple to repair and maintain. Good luck

Nov 20, 2022 | 10:31 AM

torq'ta 5 8

Lead Driver

Joined: Jan 2019

Posts: 5,086

Likes: 869

From: N.W. Alabama

He said, it revs up, a weak fuel pump, wont let it rev up, a worn 5 speed, clutch, a really low(fluid) automatic, either will let it rev up. Carbs make more peak power, but EFI has a broader powerband, I dont ride around town at 5-6,000rpms, all day.
EFI maintains optimum air/fuel ratios, eliminating random engine stoppages, oiled spark plugs and other problems associated with sub-optimal ratios. Carburetors tend to need frequent adjustments; EFI engines eliminate the need for repeated modifications.