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04-03-2014, 04:35 PM
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CC Member
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Join Date: Sep 2013
Location: Sparta,
nj
Cobra Make, Engine: Backdraft 1048
Posts: 270
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Help!!!
Just took the car for a nice ride pretty hard and it ran great. went back out and it started to shutter going up the driveway really rough under load. When I rev it in neutral it seems fine with just a little roughness. I turned it off and restarted and it smokes out the passenger headers. The smoke is on the white side with no distinct smell. I did notice that the one spark plug wire was kinda burnt but not melted. Could this be the cause or did something really bad go wrong. I tried to see if the spark was shorting to the header but couldn't see anything. Head gasket?
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Gary
Backdraft 1048
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04-03-2014, 04:41 PM
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Join Date: Dec 2001
Cobra Make, Engine: BDR
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Picture of plug wire may help, if it is shorting to the block or header this would be a symptom.
Check your dizzy cap too, center tab might have an issue. Look for tracking inside or a possible cracked rotor.
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04-03-2014, 04:49 PM
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The headers are to hot to get the wire off. I did shove a paint stirrer between the wire and headers since wood is an insulator but no change. Would it smoke if one cylinder was not firing?
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Gary
Backdraft 1048
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04-03-2014, 04:53 PM
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The engine doesn't make any bad noises like knocking just rough and smoke out the passenger exhaust.
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Gary
Backdraft 1048
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04-03-2014, 04:54 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Could be the intake manifold and/or head gasket. Sucking anti-freeze into 1 or cylinders.
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04-03-2014, 04:59 PM
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Quote:
Originally Posted by genolan
The engine doesn't make any bad noises like knocking just rough and smoke out the passenger exhaust.
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Is it smoke or unburnt fuel from a cylinder not firing? Pull the dizzy cap and take a look. It will take all of five minutes.
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04-03-2014, 05:05 PM
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just looked at the cap and it seems ok, The smoke had no real smell and was on the white side. I'm not sure what unburnt fuel looks like
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Gary
Backdraft 1048
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04-03-2014, 05:08 PM
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Grayish white mist if you don't smell or taste antifreeze, probably isn't head gasket. sounds electrical or electronic.
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04-03-2014, 05:11 PM
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Let it cool down pop some plugs and see what they look like, or if you have an IR hand thermometer start it up and check all your header exhaust port temps. if one or more is cooler than the rest you have a cylinder not firing.
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04-03-2014, 05:40 PM
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just pulled the wire off and it was melted pretty bad with the conductor showing. I'm trying to post a picture. Just so I don't freak out white gray smoke can be unburnt fuel?
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Gary
Backdraft 1048
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04-03-2014, 05:50 PM
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Gary
Backdraft 1048
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04-03-2014, 05:58 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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04-03-2014, 06:04 PM
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Thanks for posting the picture Fred
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Gary
Backdraft 1048
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04-03-2014, 06:10 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Not Ranked
Wouldn't hurt to check your oil condition and coolant for anything out of norm.
Could help your peace of mind too.
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04-04-2014, 05:20 AM
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Quote:
Originally Posted by 392cobra
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Looks like the terminal end is exposed which would create the arc to ground. I would replace and start her up.
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04-04-2014, 08:42 AM
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Headed to the local speed shop to get a new wire, plug and heat sock. I'm keeping my fingers crossed that this solves the problem.
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Gary
Backdraft 1048
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04-04-2014, 12:35 PM
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Good luck let us know how you make out.
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04-04-2014, 02:22 PM
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Just replaced the wire and plug and No Good same problem. I checked the coolant overflow tank and it's half full but I have no reference point to compare with. It's looking more and more like head gasket.
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Gary
Backdraft 1048
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04-04-2014, 02:30 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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I was afraid of that,damn.
Get yourself a Cooling System Pressure Tester. Craftsman make a nice one.
It will help you find the leak without just going in and replacing all the gaskets.
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04-04-2014, 02:58 PM
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CC Member
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Join Date: Sep 2013
Location: Sparta,
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Cobra Make, Engine: Backdraft 1048
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A friend told me to stick my fingers in each side pipe and see if one is slippery and it is. The cause is coolant in the pipes. DAMM
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Gary
Backdraft 1048
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