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Author
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Topic: Misfire
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89_Faleen
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Member # 10728
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posted
 
 
I changed my spark plugs and oil on Sunday and after I turned it on I developed a misfire on cylinders 5 & 6. It's a 97 cobra. Plugs are tr6 gapped at 28 like I always gap them too. I changed wire to different cylinders misfire didn't change, I swapped spark plugs to different cylinders still the same, I put old plugs back in no change, I swapped coil packs still the same 5 & 6. I checked for injectors for pulsation with a stethoscope I could hear them. Only thing I can think off is maybe I lost compression on those to cylinders. I have no check engine light. Car ran great before oil and spark plug change
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1990 GT (SOLD)
1990 LX (SOLD)
1995 GT (SOLD)
1989 LX (SOLD)
1997 COBRA (RIP)
1989 FALEEN (CURRENT)
Posts: 275 | Registered: Mar 2011
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kuku93
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Member # 14014
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posted
How's the oil pressure
Posts: 154 | Registered: Apr 2015
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89_Faleen
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Member # 10728
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posted
On my factory gauge between the A and L on normal, I don't have an aftermarket gauge to see actual psi.
Posts: 275 | Registered: Mar 2011
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NK2186
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Member # 12319
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posted
check and make sure the spark plugs are tight, also make sure oil is not filling in the plug wells on those cylinders. if not ignition related you may have a bad headgasket since its two cylinders next to each other.
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90 LX 5.0 - Stolen/stripped
89 LX 5.0 - Stolen and missing as of 7-24-13. LIC# 4HIP151 :(
99 Cobra
00 Exploder
Posts: 400 | From: Haystack | Registered: Aug 2012
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NonOpSlow2V
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Member # 6111
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posted
Did you ever diagnose and solve your issue on the Cobra?
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1997 Autumn Orange GT vert
1996 Mystic Cobra
2005 95ci Harley Road King
2011 F150 Raptor
Posts: 2139 | From: San Francisco | Registered: Oct 2005
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89_Faleen
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Member # 10728
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posted
Yes i had knocked out a vacuum hose by accident was only touching the nipple but not fully inserted
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1990 GT (SOLD)
1990 LX (SOLD)
1995 GT (SOLD)
1989 LX (SOLD)
1997 COBRA (RIP)
1989 FALEEN (CURRENT)
Posts: 275 | Registered: Mar 2011
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