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Re: won't accelerate, especially up hills i suspect
I would think it's your fuel filter. It's under the hood, mounted on the firewall. Also, check the air filter. I would check the vacuum hoses for any holes or cracks.
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A vacuum leak in the intake manifold of a 2000 Ford F150 4x4 with a 4.6L engine and automatic transmission can cause a range of symptoms, including:
Rough idle: A vacuum leak can cause the engine to run rough at idle, which may be especially noticeable when stopped at a red light or stop sign.
Misfires: The engine may misfire or hesitate under load, such as when accelerating or climbing a hill.
Poor fuel economy: A vacuum leak can cause the engine to run lean, which can result in decreased fuel economy.
Check engine light: A vacuum leak can trigger a check engine light, which may indicate a code related to the engine's fuel system.
Stalling: In some cases, a vacuum leak can cause the engine to stall or die, especially at idle or when coming to a stop.
Hissing sound: A vacuum leak may cause a hissing sound to be audible from the engine compartment, especially if the leak is large or near the intake manifold.
If you suspect a vacuum leak, it's important to have it diagnosed and repaired as soon as possible, as it can cause damage to other engine components over time if left untreated. A mechanic can perform a smoke test or other diagnostic procedures to locate the source of the leak and repair it as needed.
Check the coil pack maybe braking down under a load.unplug each plug to see if there is any change may have week pack.if no change do a compression check on all cylinders.
You need a specific adapter to scan your trouble codes. Vehicles prior to 1996 use OBD1 scanners, which are very expensive. Your best bet is to call around a few shops in your area and ask what they would charge to diagnose the code. It sounds like you may have more than 1 problem. The emissions could be due to a bad oxygen sensor and acceleration problem may be due to bad plugs, plug wires, clogged fuel filter, rotor and distributor cap, etc. Do a tune up on it, then see where you stand. At least you won't have to pay a shop to do it if that fixes your acceleration problem.
When going up hills is the engine bucking and missing? Also for the hard start warm problem, check the fuel pressure regulator for leaks into the vac line.
Under a load or uphill,would suggest that a high vacuum signal was involved. So think EGR Valve. I know you got no codes. This is an exercise in logic.
A misfire will present it'self going up hill or loading the engine. e.g. hard on the gas
What has no sensor or won't set a code easily. Vacuum leaks,air filter,all air intake ducting,MAF Sensor,Throttle Position Sensor and don't forget those really small EVAP Leaks,most people never heard of.
Is the converter partially blocked?
O2 Sensors switching properly?
Fuel pressure,under a load? New fuel filter?
This could be a problem with plugs, wires, distributors, fuel filter or fuel injectors. Try changing the plugs and wires first, then the fuel filter. If you are changing the plugs and wires, make sue you use anti seizing compound and dielectric grease.
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