5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

car is bucking

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Old 02-13-2011, 08:49 PM
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92 5.0stang
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Default car is bucking

my car has been bucking around 4500 RPM ever since i had my fuel pump replaced. Causes ??????
Maybe need new plugs?
New air filter?
Maybe they put a bad fuel pump in?

Last edited by 92 5.0stang; 02-13-2011 at 08:57 PM.
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Old 02-14-2011, 10:20 AM
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86 newbie
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my car bucks too at 3rd gear at 1800 rpm its a stock 86 5.0. i know i should start my own forum but i thought since its similar i should just post it here
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Old 02-14-2011, 10:29 AM
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enix187
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3rd and 1800 rpm is a little low, itll buck when you try and accelerate because the gear is too tall to run at that rpm for any kind've power, either that or you need a clutch, and start your own threads man.

to the op, you need to hookup a fuel pressure gauge and watch it while driving, poke it through the hood/cowl,
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Old 02-14-2011, 01:47 PM
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92-

Did you replace your fuel filter during this? If not you should have. Sounds like a tuning issue almost but you said you replaced the fuel pump.... same flow I take it? Old was stock and new is stock size? It could be a bad pump but I would recommend what enix said. Yes, it could be air filter or plugs... but right after a pump install I would take it directly back to where you had it and make them fix the problem and you pay no more money whatsoever and it be done now. As courteously as possible is how this should be handled..... be careful. Maybe you don't want to take it back if they are a bad shop. Good luck man.
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Old 02-14-2011, 06:14 PM
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92 5.0stang
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Originally Posted by ssj50driver
92-

Did you replace your fuel filter during this? If not you should have. Sounds like a tuning issue almost but you said you replaced the fuel pump.... same flow I take it? Old was stock and new is stock size? It could be a bad pump but I would recommend what enix said. Yes, it could be air filter or plugs... but right after a pump install I would take it directly back to where you had it and make them fix the problem and you pay no more money whatsoever and it be done now. As courteously as possible is how this should be handled..... be careful. Maybe you don't want to take it back if they are a bad shop. Good luck man.
well i just ordered a tune up kit from late model resto. with the plugs, rotor, cap,wires. i also got a fuel filter and a air filter. I dont think it got changed when they did the pump. ya they took out a stock pump and replaced it with what im guessing was the same. if none of the things i replace fixes it im definitely going to take it back and tell them, politely of course. Problem is that its been 6 months. i just havent had the time with school and work to bring it back in. they operate in a college town so im sure they will understand.
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