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 08-26-2007, 08:10 PM
  #1  
StangBullet91
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Default help!

Im have a bit of a problem with my 91 lx. im running really hot right around 260. and just a minor problem... my spedo is 10mph too fast. i have already changed the thermosdat and flushed the rad. the only other thing i can think of is the rad cap being bad and not holding pressure. and the matter of the spedo... i have changed the spedo gear to the right ratio for the rearend gears, and the tires are the same height as the old wheels and tires. please help!
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Old 08-26-2007, 08:39 PM
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StangBullet91
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Default RE: help!

anyone have any ideas?
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Old 08-26-2007, 08:41 PM
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Maxwelhse
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Default RE: help!

260 is crazy hot. You might want to install an aftermarket gauge to confirm that or try a new sending unit. I find it hard to believe that the car would still be running at 260.
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Old 08-26-2007, 08:45 PM
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StangBullet91
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Default RE: help!

the sending unit and the ect sensor are new although i do have whiteface gauges and when i turn the lights on the gauge goes up about 20 degrees almost instantly and vice-versa when i turn them off
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Old 08-27-2007, 12:49 PM
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SoDakStang
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Default RE: help!

Lol, you just answered your own questions. You put the faces on? Chances are that you needle placement is way off. Pull it back apart and fix the needle placement before jumping to conclusions. You may have wasted you money with the other "repairs". But, as long as it was done correctly it won't hurt anything.
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