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.

problems

Old 12-18-2007, 09:14 PM
  #1  
84conversion50
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Default problems

got a used motor with about 70k miles on it. dropped it in and got it running. so the problems..
low oil pressure. at idle at 10-12. when you start driving it goes up to 30-33 when you get on it and 22 when normal driving. is this a problem? my other motor had 60lbs+

other problem is when i time it to 10degrees like the specs call for it does not want to stay running. but at 22 it idles great but backfires like a fully auto shotgun.
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Old 12-18-2007, 09:24 PM
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95vertGTS
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Default RE: problems

try setting everything to TDC, resetting the dizzy,and then setting timing to 12* or so
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Old 12-18-2007, 09:29 PM
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84conversion50
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Default RE: problems

it dont want to start then itll just turn and sometimes try to kick. im wondering if im 180 off but i cant check till the morning
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Old 12-18-2007, 09:43 PM
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mx07gt
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Default RE: problems

with the engine running....take the oil cap off... does air sputter out?
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Old 12-18-2007, 09:46 PM
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84conversion50
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Default RE: problems

there is a hole that t's off on the oil cap. dont know what it was for but its just open now. what would it mean if air did sputter out
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Old 12-18-2007, 10:20 PM
  #6  
84conversion50
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nm duh itd be blow by but why would that cause that?
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Old 12-18-2007, 11:37 PM
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mjr46
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Default RE: problems

ORIGINAL: 84conversion50

got a used motor with about 70k miles on it. dropped it in and got it running. so the problems..
low oil pressure. at idle at 10-12. when you start driving it goes up to 30-33 when you get on it and 22 when normal driving. is this a problem? my other motor had 60lbs+

other problem is when i time it to 10degrees like the specs call for it does not want to stay running. but at 22 it idles great but backfires like a fully auto shotgun.
22 for a base timing setting is = too much..set to spec and if it won't idle make sure dizzy is not a tooth off or two and if it won't idle then try adjusting the carb
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Old 12-18-2007, 11:40 PM
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84conversion50
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Default RE: problems

it wont start at all at 12. but would that cause low oil pressure also? or is that low
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