Gummy stuff in carbs and on pistons

C

cooldad9597

New member
Joined
Feb 5, 2009
Messages
4
Age
54
Location
Green Bay, WI
Last year I popped a hole in my front heat exchanger on my 97 600sx. I replaced it over the summer and everything worked fine. Tried to start in winter and at first it started fine and ran fine. Then it wouldn't start. Now I got it to start, but when I grab the throttle, it dies out on me. I cleaned the carbs of some gel like stuff, then started and ran great until I let it idle for 2 mins. Then same thing. I cleaned carbs again, but no luck this time. Pistons started to freeze up. I pulled the head and found some gummy/grease like material all over the pistons and in the head. Kind of the same thing that was in the carbs, just stickier. Carb cleaner and ALOT of scrubbing to get it off.
I did have Stabil in the gas over summer, then put 2 caps of Seafoam in the gas tank when I got it to idle.
Any clues???
Meanwhile I'm riding my 09 Vector LTX GT, and loving it.
 
What is happening is that the new ethanol blended fuels are disolving all of the crap in your fuel system and sending it on through to your engine. The new fuels also suffer from phase separation and that's likely the goo you are seeing. Stabil makes a new product just for the ethanol blend fuel that has 4 times the cleaning agents of the old stabil. It is called stabil marine because the marine industry has been hardest hit by the new fuels. I know the gum you are talking about, it's a particular problem with small two strokes like weedwhackers and chainsaws. The jury is still out on what to do about it. I personally add shot of marvel mystery oil to each tank full and have adopted the practice of draining all gas from my tank and carbs between seasons. It's a big debate and hard to sift through opinions and facts.
 
FWIW, I have not had an issue with e10 fuels that we have had for 15+ years.

I don't know if you should have mixed stabil and seafoam at the same time.

There is a chance that your fuel filter could be plugged up. The e10 will wash the gunk that has accumulated in your tank, lines, etc over the last 12 years and get gummed up.
 
could it be the residue from the antifreeze by any chance? That's what it appears to be on the pistons.
Head gasket was shot from overheating.
 
yes on piston no in carb, you forgot to say you overheated it hay is it single pipe?
 
Last edited:
then i would guess that the blown head gasket took out both cylinders, but if you have jelly in carbs you need to clean fuel system totally
 
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