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» Northern California Ford Owners     » Automotive   » Tech Talk   » Misfire

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Author Topic: Misfire
89_Faleen
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Member # 10728

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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  |  :
kuku93
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Member # 14014

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How's the oil pressure
Posts: 154 | Registered: Apr 2015  |  :
89_Faleen
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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  |  :
NK2186
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Member # 12319

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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  |  :
NonOpSlow2V
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Member # 6111

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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  |  :
89_Faleen
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Member # 10728

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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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