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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 08-23-2009, 07:10 AM   #1  
stangmanfifty
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Default need forums advice..

well my 5.0 has been doing this weird thing every time during a cold start. First i turn the key car turns on, hesitates, then bogs down, and turns off. I turn it back on for the 2nd attempt then there she goes.., starts right up and stays idling good. What can be the problem?
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Old 08-23-2009, 08:35 AM   #2  
zebo87
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is there any kind of hesitation or lack of power or anything like that or does it run good and strong after that.
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Old 08-23-2009, 09:29 AM   #3  
mjr46
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yuo need to perform a fuel pressure test and check for leak down, once you have confirmed such we can go from there
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Old 08-23-2009, 01:22 PM   #4  
89gtwith3.55s
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also check to see if you are running lean mine was doing that too id have to rev it a bit b4 it would idle also if i had to the second start would be good
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Old 08-24-2009, 04:26 AM   #5  
stangmanfifty
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well after the second attempt it turns on and idles fine! i did mess with the tps once on another 5.0 and it started doing the same? i checked my tps and volts are where they should be. car runs nice and strong but i dont like that hesitation on the cold start.
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