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Author
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Topic: 91 5.0 lean codes/ and backfiring on decell/ low power
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dean-93
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Member # 9401
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posted
 
 
working on a buddys 91 5.0 mustang when he got it it was a basket case.now it runs and idles good, tuned up, cleaned maf ,fixed all the vac/exhaust leaks.
the only problem is that its not full power and it backfires on decel. also it thru codes 41 and 91 so its running lean forsure
also it has good power till about 3500rpm then it kinda gets weak.dosent sound like its missing tho
were going to throw a fuel pressure gauge on it tomorrow.
just wondering if anyone has any ideas for us to check
thanks ,dean
[ 2014-04-20, 05:34 PM: Message edited by: dean-93 ]
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93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
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dean-93
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Member # 9401
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posted
also we timed the car at 10 12 and 14
it liked 14 the best
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93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
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dean-93
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Member # 9401
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posted
we found a orange wire that wasnt grounded that was o2 senseor ground,runs good now just still not full power
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93 5.0 trickflow h/c/i
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
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nasty93
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Member # 8935
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posted
One of my of motors started doin that when the rings started going..
Posts: 464 | From: windsor ,ca | Registered: Feb 2009
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Tom Renzo
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Member # 13165
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posted
Check the leak down and compression. Then post back.
[ 2014-04-24, 04:58 AM: Message edited by: Tom Renzo ]
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I spend money i don't have. Building cars i don't need. To impress people i don't know.
Posts: 557 | From: CT | Registered: Sep 2013
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dean-93
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Member # 9401
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posted
fixed it it was the fuel pressure only had 25 psi running,put a new 255lph walbro and all is good
Posts: 1175 | From: novato and fairfeild | Registered: Aug 2009
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