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.

ruff idle

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Old 08-20-2004, 10:52 PM
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luckythirteen13
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Default ruff idle

last night i drove my car and had no problems or any signs of problems to come. this morning when i went to work the car had a really ruff idle. it sounded like and drove like it was missfiring. it was also lacking a lot of hp. i just got home so its too hot to touch but when it cools down, what should i check for? (besides the plugs) in case its important, it was running about 180-190 degrees the whole time. what would make such a difference while it was just sitting over night?
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Old 08-21-2004, 12:47 AM
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Default RE: ruff idle

went back and found the plugs are fine and the timing is set for 13 degrees. i tried resetting the computer but that didnt work.

my next question is, how long do o2 sensors last. the ones i have in there now are orriginal from 92. ive heard they are only good for 3 years. ive also heard 5 and 10. regardles of which one, im at 12 years. my car smells like its running rich (yes i know it has no cats) but it still seems to smell more then i thought it would. any thoughts?
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Old 08-21-2004, 01:38 AM
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bobby
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Default RE: ruff idle

replace the 02 senosrs, they say 30k miles but i wouldnt let them go that long.
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Old 08-21-2004, 01:40 AM
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Stinger
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Default RE: ruff idle

Bobby wanna sell your old hood? Hey try O2 i get same problem but i dont lack HP just stumbles
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Old 08-21-2004, 01:55 AM
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LOL just got it, ill sell it for 600!!! haha
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Old 08-21-2004, 02:10 AM
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luckythirteen13
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Default RE: ruff idle

30k huh? ive got about 92K. next week when i get paid thats the first thing im going to do. is there anything else that it could be while im replacing parts?
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Old 08-21-2004, 02:32 PM
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Moosetang
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How much does it cost to replace the 02's?
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Old 08-21-2004, 03:42 PM
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Jugador
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Default RE: ruff idle

ORIGINAL: bobby

LOL just got it, ill sell it for 600!!! haha
he said your old hood, as in the one you used to have.
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Old 08-21-2004, 09:57 PM
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roundman
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Default RE: ruff idle

ORIGINAL: luckythirteen13

last night i drove my car and had no problems or any signs of problems to come. this morning when i went to work the car had a really ruff idle. it sounded like and drove like it was missfiring. it was also lacking a lot of hp. i just got home so its too hot to touch but when it cools down, what should i check for? (besides the plugs) in case its important, it was running about 180-190 degrees the whole time. what would make such a difference while it was just sitting over night?
you didn't by chance get some bad gas with some water in it did you? sitting overnight the water would have settled to the bottom of the tank and maybe the fuel pump picked it up and is causing this problem.
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Old 08-21-2004, 10:46 PM
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luckythirteen13
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Default RE: ruff idle

actually roundman you may have something there. that night i did 2 things. got gas and went to the pet store. the whole trip was maybe 3 miles. ive noticed my car has a lack of power when i get gas there and it only gets about 14mpg from them too. the arco on the way to work gets me 18mpg. i have some octane booster laying around, should i run that stuff through untill the tank is empty. im pissed cause i put in 10 gallons too
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