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Author
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Topic: one cylinder running hot
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9cobrasnake9
CAFords OG
Member # 575
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posted
 
 
I just got my 83 5.0 started and finally idling decently at about 1000 rpm. My problem is my number 6 cylinder is heating up red hot. I can tell because just the header is dicolored coming out of that cylinder. It lit up my precat bright red. Anyone have any ideas. Maybe some kind of air leak. The plug looks fine.
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96 Mystic Cobra
2011 F150 Raptor
Posts: 893 | From: Chico, Ca | Registered: Nov 2001
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Stimson
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Member # 51
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posted
Run a leak down test on the motor. You may have some valve problems going on there.
Posts: 2373 | Registered: Jun 2000
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CustomFastbackCA
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Member # 1369
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posted
Could also be a hot spot on the piston if the rings are fried or warped on number 6.
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www.CustomFastbackCA.com
1995 Dinan M3 Avus Blue Metallic
1967 GT Mustang Fastback (Eleanor)
Ask questions if you have'em, anyone who thinks they're too cool, know's it all, or doesn't want to look stupid has more problems than you.
Posts: 346 | From: Santa Clara | Registered: Jun 2002
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9cobrasnake9
CAFords OG
Member # 575
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posted
It is a rebuilt motor. The leakdown test was done after assembly and everything checked out perfect. Could it be anything else?
Posts: 893 | From: Chico, Ca | Registered: Nov 2001
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Gear Head
JARED
Member # 779
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posted
Would cooler plugs help ![[Confused]](confused.gif)
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Support our troops!
Posts: 5685 | From: EASTBAY | Registered: Jan 2002
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Milesblown03
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Member # 27
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posted
How does it run?? Idle smoothly? May be a leaky injector, plugged injector, etc. do you have all the spark plug wires routed correctly?? Make sure youre using the right firing order ( i believe the older 5.0 used the 1-5-4-2-6-3-7-8) Make sure youre not using the HO firing order (1-3-7-2-6-5-4-8)
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99 honda 996 superhawk...
03 cobra:422rwhp,399rwtq (before pulley)
New best,12.07@119.9(!!)mph on nittos (cant drive to save my life!)
Posts: 1002 | From: Hayward, CA | Registered: Jun 2000
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9cobrasnake9
CAFords OG
Member # 575
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posted
I have stock replacement ngk plugs for a 93 cobra. The car does not idle smoothly but it is carburated. I might have thought cooler plugs but only one cylinder runs hot. Could it be an air leak in the manifold?
Posts: 893 | From: Chico, Ca | Registered: Nov 2001
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