Power, Surges, Problems....
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Power, Surges, Problems....
I have a 90 F-150 with a 5.0, 4x4, automatic, with 31x10.50 tires. I have given it a recent tune up (plugs, wires, oil change, radiator flush, front and rear diff. services, coil, cap, rotor, intake cleaning, fuel system cleaning, transfer case service, IAC cleaned). I need to replace the TPS still. The truck runs good when it is cold, but the longer I drive it, the more power I lose. The truck also seems to surge while driving, and according to my mechanic the TPS is causing the truck to almost (or to) die when i am driving and let off of the throttle. Is the TPS causing the surge issue, and the lack of power. I have recently "cleaned out" my catalytic converter so I know that is not to blame for the severe power loss. Any suggestions?
Also is there a way to put a mustang intake on the truck to give it more power, or is that just me being stupid. I don't know if the throttle cables would be an issue for that, or should i just put another mustang motor in the truck for the 300 foot lbs of torque that Ford says the mustang motor makes.
Also is there a way to put a mustang intake on the truck to give it more power, or is that just me being stupid. I don't know if the throttle cables would be an issue for that, or should i just put another mustang motor in the truck for the 300 foot lbs of torque that Ford says the mustang motor makes.
Senior User
Joined: Apr 2003
Posts: 185
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From: Raleigh, NC
I'm having similar symptoms with my 89 F150, 351W. In my case the truck stutters under mid-range acceleration on warm engine,and also when I let off the accelerator pedal there is a delay before the engine decreases rpm (like you are coasting instead of slowing down). Replaced plug wires, distributor cap, rotor and tuned up, ran Seafoam through, misted the plug wires to check misfire.My mechanic suggested fuel injector cleaning but I haven't got to it.
Many posts on this topic state that after the basics try replacing the O2 sensor or removing and cleaning the throttle body - not sure about the TPS.
Many posts on this topic state that after the basics try replacing the O2 sensor or removing and cleaning the throttle body - not sure about the TPS.
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Joined: Oct 2004
Posts: 371
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From: Wetaskiwin, Alberta
The mustang intake won't give you much, if anything. The stock 5.0 intake setup is said to be one of the more efficient ones Ford used for flowing air into the motor. You might want to look at imcreasing the air flow through a different air cleaner or something like that but the actual intake plenum is pretty good.
Cheers!
Mike
Cheers!
Mike
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Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
PULL CODES www.fordfuelinjection.com will show you how before replaceing parts. the tps is the likely suspect here for sure.
now as for the motor. a mustang motor in a truck is the wrong way to go man. most stang motors are built to build power up hi in the rpm range which is not where you want for a 4wd. honestly the intake you have is more then sufficent, if you need more power replace the stock manifolds for a good set of headers, get the bassani Y pipe and run 3" exhaust out stock location. running the single exhaust will improve low end, also bumping the timing up to 12*btdc with spout connector removed will also help. there are a few cams available to that will run well with the speed density efi you have. call compcams and they can get you hooked up. next thing would be gears
later
now as for the motor. a mustang motor in a truck is the wrong way to go man. most stang motors are built to build power up hi in the rpm range which is not where you want for a 4wd. honestly the intake you have is more then sufficent, if you need more power replace the stock manifolds for a good set of headers, get the bassani Y pipe and run 3" exhaust out stock location. running the single exhaust will improve low end, also bumping the timing up to 12*btdc with spout connector removed will also help. there are a few cams available to that will run well with the speed density efi you have. call compcams and they can get you hooked up. next thing would be gears
later
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almonyspm1
1987 - 1996 F150 & Larger F-Series Trucks
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Jun 19, 2013 11:06 PM
