Engine shut off, now no-start
Evening,
While cruising tonight at ~50mph, I noticed that my truck would not accelerate. I mashed the throttle to try and move over three lanes to get off the road and the truck shuttered some, backfired a couple times and then accelerated slowly. While pulling into a parking lot, the engine finally shut off completely. Now engine will turn over normally, but will not start. I haven't had time to do any diagnostics other than reading the trouble codes. P0171 and P0173. 2002 F150 XL 4.6L 4x4 220k mi Any ideas? |
Also, the truck now shakes badly while cranking.
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Fuel filter? Fuel pump? Any fuel pressure? Inertia switch tripped? Just brainstorming.......
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Go check fuel pressure with a gauge. You probably have little to none.
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Originally Posted by projectSHO89
(Post 4947343)
Go check fuel pressure with a gauge. You probably have little to none.
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fuel pressure gauge, hook it to fuel rail and turn engine over...
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I get that part, but what am I looking for as far as pressure?
Btw, sorry for the poor spelling. My phone has a mind of it's own. |
You probably need 28 psi to start it.
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Originally Posted by jiggle
(Post 4947384)
I get that part, but what am I looking for as far as pressure?
Btw, sorry for the poor spelling. My phone has a mind of it's own. when was the last time the fuel filter was changed? with p0171 you may have a vacuum leak too....so look those over carefully too. also...make certain that your air filter is in good shape and the MAF sensor is clean |
Thanks. The fuel filter has around 15k on it. At work right now so I can't do much. I did notice that I can't seem to hear the fuel pump come on with key turned to run. I can hear what sounds like a solenoid clicking on and off, but not the buzzing of the pump.
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So as expected, my fuel pressure is exactly 0. Is the fuel pump the most likely culprit? I'm kinda short on time, so I'm tempted to just go buy a fuel pump and hope that fixes it. Any fuses or relays that are known to go bad?
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There is a fuel pump relay, on my '97 it's under the hood. I believe you can switch out the horn relay to check if it's bad. Also check all fuses just to be safe. If not a fuse or relay, the pump has probably crapped out.
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Changed fuel pump, truck started right up. FYI, if you have a body lift, you can get away with not pulling the bed or fuel tank. I just unbolted the front strap and loosened the rear one. Rested front of tank on a cinderblock standing on its end. That gave me just enough clearance to swap the pumps out.
Thanks for the help. |
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