Why is this 5.0 so much slower now? - MustangForums.com


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.

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Old 10-12-2007, 02:37 PM   #1  
flyinghigh2k8
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Default Why is this 5.0 so much slower now?

My buddies car has been sitting up for several months because he wrecked it. He just got it running again but it is running much slower. Starting at about 3500 rpms his car struggles to get up to 5000 wich is where he shifts. And sometimes back fires when he changes gears. My guess is that the fuel filter is clogged for sitting up so long. What do yall think? It's a 94 gt.
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Old 10-12-2007, 02:59 PM   #2  
bobbyboura
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Default RE: Why is this 5.0 so much slower now?

how was it wrecked in the fron or back or what sounds like its outa time need more info
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Old 10-12-2007, 07:19 PM   #3  
86GreenMachine
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Default RE: Why is this 5.0 so much slower now?

Mine was backfiring when i shifted before and it was an exhaust leak.Dont know about the struggling though.
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Old 10-12-2007, 07:26 PM   #4  
mjr46
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Default RE: Why is this 5.0 so much slower now?

Get the gas out of it and run a fresh tank of fuel in it...nowdays the gas doesn't take well to sitting very long and cars that sit for extended periods of time have come into our shop with driveability issues and a fresh tank of fuel has cured it....we have one customer in particular that never drives their mercedes and often has this issue as it'll sit for 3-5 month sometimes not driven
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Old 10-13-2007, 12:09 AM   #5  
Slimboyfatty
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Default RE: Why is this 5.0 so much slower now?

The backfiring could be caused from the smog pump if your running no cats.
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Old 10-13-2007, 11:08 AM   #6  
jeffro22
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Default RE: Why is this 5.0 so much slower now?

i woudl say a tune up souldn't hurt. Filters, plugs, check timing. When my distributor stated to gobad it drove like crap. But if the car was fine before it sat i would look more towards fuel and maintanece items
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Old 10-13-2007, 11:23 AM   #7  
grabbem88
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Default RE: Why is this 5.0 so much slower now?

deff check all your ignition stuff.............it sat so moisture/elements ate at your coil/cap rotor ect...get a bottle of heat and put in your tank likely the fuel broke down it takes about 3 months to "water" up.
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Old 10-13-2007, 11:40 AM   #8  
tmajikman
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Default RE: Why is this 5.0 so much slower now?

Make sure you don't have any vacuume lines disconnected, I had the same problem, fixed the line and fixed my problem.
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Old 10-13-2007, 12:14 PM   #9  
creekrat
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Default RE: Why is this 5.0 so much slower now?

Drain the fuel tank and add new fuel especially if you need higher octane fuel from mods. Don't take long at all for fuel to get funky, especially if the fuel level was low in the tank. It tends to draw moisture much quicker and break down if the tank is not full
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