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.

Valve Float.. SH*T

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Old May 30, 2007 | 12:50 AM
  #1  
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Default Valve Float.. SH*T

So... I was driving around tonight and i was planning to go to the track tomorrow. I never really beat on my car or bring it further than 4K. So i was driving around and pushed it up to about 5100 rpm and it sounded funny. Then i did it again and around the same rpm and sounded like it was a floating valve. The car has 115K and doesnt leak anything, i dont see why it would be doing this. anyways, anyone experience this with thir cars in simmilar condition. Im pretty pissed, because looks like valve springs next. oh yea, and the thing is totally stock other than mods in the sig. Thanks
Old May 30, 2007 | 12:53 AM
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Default RE: Valve Float.. SH*T

ORIGINAL: billyam87

So... I was driving around tonight and i was planning to go to the track tomorrow. I never really beat on my car or bring it further than 4K. So i was driving around and pushed it up to about 5100 rpm and it sounded funny. Then i did it again and around the same rpm and sounded like it was a floating valve. The car has 115K and doesnt leak anything, i dont see why it would be doing this. anyways, anyone experience this with thir cars in simmilar condition. Im pretty pissed, because looks like valve springs next. oh yea, and the thing is totally stock other than mods in the sig. Thanks
collasped lifter ?



I got kicked off the track, didnt have a 4 strap belt[:'(]
Old May 30, 2007 | 12:53 AM
  #3  
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Default RE: Valve Float.. SH*T

are you sure it was valve float? were you at WOT? Might of been detonation. I've push my 130K 5.0 to 6k once, that stopped my heartbeat for a bit....[&:]
Old May 30, 2007 | 12:59 AM
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Default RE: Valve Float.. SH*T

i've HELD my 302 at over 6k for like 5 miles once - it was wicked.
Old May 30, 2007 | 01:00 AM
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Default RE: Valve Float.. SH*T

Just sounds like you've got some worn out springs. Floating valves don't tend to make a sound, you usually just feel a loss in power.
Old May 30, 2007 | 01:01 AM
  #6  
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Default RE: Valve Float.. SH*T

yeah? what happened to that 302 my77stang?[8D]
Old May 30, 2007 | 01:01 AM
  #7  
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Default RE: Valve Float.. SH*T

it might be, but it didnt seem so, I wasnt running high octane gas which was dumb, also, my timing is stock and car was running at a normal temperature. Also, it runs fine at idle and all other rpms. i dont know if that helps at all..
Old May 30, 2007 | 01:02 AM
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Default RE: Valve Float.. SH*T

ORIGINAL: my77stang

i've HELD my 302 at over 6k for like 5 miles once - it was wicked.
No wonder your crank snapped














Old May 30, 2007 | 01:04 AM
  #9  
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Default RE: Valve Float.. SH*T

oh yea, and i was at WOT
Old May 30, 2007 | 01:11 AM
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Default RE: Valve Float.. SH*T

well was the car still pulling hard up to 5000 rpm's?

the stock 5.0 loses its power right before 5000 rpm's so there is really no need to push it that high.

i usually shift at 4500 when pushing the car to its limit because i have an auto and by the time the next gear engages im already at 5000 rpm's



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