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Old 03-05-2008, 08:43 AM
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Carb back firing after Sea Foam

Hi I'm Dewey. I ran Sea Foam Through the PCV vac line and in the engine oil per instructions on the can. The truck ran alot better for about a week then It started to pop rapidly through the carb when the gas is pressed. any ideas what kind of damage I have caused

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Old 03-05-2008, 10:41 AM
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You may have loosened a chunk of carbon that has gotten itself wedged between the valve seat and face, causing the valve to not fully close. Do a compression test to isolate the offending cyl. I have in the past been able to rotate the valve stem by hand and get the carbon removed. Worst case, the head will have to be removed and cleaned.
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Old 03-05-2008, 02:57 PM
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Ayuh,...

Or,....
You've picked up some Crap in your gas in the mean time,+ it's running Lean now......
Change the Fuel Filters and See.....

Or,....
If it's the Carbon Issue, like gismo says,....
Give it the Water Cleaning treatment,....
There won't be any Carbon anywhere in the motor then....
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Old 03-05-2008, 03:28 PM
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You also may have cleaned some crap off of a gasket mating surface and now you have a vacuum leak. I have seen this before. You can check for a vacuum leak by spraying carb cleaner around intake mating surfaces, carb to intake etc and see if the idle changes. If it does, you have a leak.
You may have also washed out a piece of gasket
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Old 03-05-2008, 04:22 PM
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I think it is in the #1 cyl when I pull that plug wire the popping stops. I pulled the valve cover off and tighened the rocker arm slightly and now it is better but still pops could it be a valve adjustmet? and would these be mech or hyd
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Old 03-05-2008, 04:24 PM
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I have also done the carb cleaner thing and no apperant leaks
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Old 03-06-2008, 07:59 AM
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Thanks for all the help. It looks like I have a bad lifter and possibly a bad cam.
I'll keep ya updated. thanks again
Dewey
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Old 03-13-2008, 08:50 AM
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Update

The #1 exhaust lobe was gone and the lifter was dimpled really bad. I guess that will cause it Ha Ha. A good friend of mine gave me a new set of heads and am putting in a slight larger cam and new lifters. she should run like a champ when i'm done. again thanks for all the help.
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