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Old 03-13-2009, 04:53 PM   #1
Curly86
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Rough Running

I have an 86 SWB with a 75-80 model 400 SB in it. When i park it for 2-3 days it will miss and run rough for about 2 minutes and it will smooth out.But it is getting worse and I"m starting to lose some water and I have a feeling it is a blown head gasket and it will puff a little white smoke every once and a while. And I have a little water coming out of the tail pipe am I on the right path? any suggestions?
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1986 Silverado Flatbed 400 SB with 350 turbo

1997 Ford Explorer with 302 mydrive to work ride

1978 Gmc Midas RV 21ft with 46,000 actual miles
2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow

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Old 03-13-2009, 04:56 PM   #2
BusinessProfessor
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Re: Rough Running

Yes, it sounds as if you are on the right track!!! Good luck!
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Old 03-13-2009, 05:01 PM   #3
Curly86
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Re: Rough Running

That was what I was thinking
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1986 Silverado Flatbed 400 SB with 350 turbo

1997 Ford Explorer with 302 mydrive to work ride

1978 Gmc Midas RV 21ft with 46,000 actual miles
2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow

Big Sandy Survivor 09

Trucks in the Blue Grass Survivor 09

TNCTC

Streetcruzin
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Old 03-13-2009, 07:46 PM   #4
heavychevy79
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Re: Rough Running

Check your plugs, they will tell you if you're getting water in a cyl, but you
might find that one is oil fouled and doesn't fire til it is hot.

Any manual will have the "sparkplugs with different problems" picture.
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Old 03-13-2009, 10:06 PM   #5
Curly86
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Re: Rough Running

Ok Thanks I think it is on the right side I am goin to change the plugs tommorrow
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1986 Silverado Flatbed 400 SB with 350 turbo

1997 Ford Explorer with 302 mydrive to work ride

1978 Gmc Midas RV 21ft with 46,000 actual miles
2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow

Big Sandy Survivor 09

Trucks in the Blue Grass Survivor 09

TNCTC

Streetcruzin

Last edited by Curly86; 03-13-2009 at 10:08 PM. Reason: did not finsh the message
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Old 03-14-2009, 12:37 AM   #6
heavychevy79
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Re: Rough Running

Quote:
Originally Posted by Curly86 View Post
Ok Thanks I think it is on the right side I am goin to change the plugs tommorrow
But make a note of which plug came out of what hole, just in case.
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Old 03-15-2009, 08:26 AM   #7
Curly86
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Re: Rough Running

ok thanks guys
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1986 Silverado Flatbed 400 SB with 350 turbo

1997 Ford Explorer with 302 mydrive to work ride

1978 Gmc Midas RV 21ft with 46,000 actual miles
2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow

Big Sandy Survivor 09

Trucks in the Blue Grass Survivor 09

TNCTC

Streetcruzin
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Old 03-15-2009, 08:44 AM   #8
grinch4om
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Re: Rough Running

400's are notorious for head gasket failures. siamese bore holes, steam port holes between cylinders. Pay attention to the gasket when you tear down and where it has failed, check that head and the block for metal erosion
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Old 03-21-2009, 09:03 AM   #9
Curly86
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Re: Rough Running

ok will do thanks
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1986 Silverado Flatbed 400 SB with 350 turbo

1997 Ford Explorer with 302 mydrive to work ride

1978 Gmc Midas RV 21ft with 46,000 actual miles
2003 Chevy Avalanche 5.3 327 and Tweety Bird Yellow

Big Sandy Survivor 09

Trucks in the Blue Grass Survivor 09

TNCTC

Streetcruzin
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