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Author Topic:   Engine Tuner
mustang7nh posted 11-14-2002 09:01 AM ET (US)   Profile for mustang7nh   Send Email to mustang7nh  

I can't get my airbox off of my 1988 200J due to the position of the hydraulic lines for power steering. Hence, I took out spark plugs and sprayed engine tuner into cylinders for about 5 seconds a piece and then turned flywheel a couple of times. I let it sit over night and then ran it in the driveway on the hose for about 10 minutes and rev it a couple of times. My friend says you need to put it in the water to run in WOT to get all that stuff out so it doesn't eat away. Is this true or am I fine?

bsmotril posted 11-14-2002 10:39 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
I don't think your motor is in any type of danger, but you likley did not get all the carbon out either. The tuner soaks into the carbon and makes it burn and flake off the piston and head. But for that to happen, you need high combustion temperatures. To get those high temps, you need to put the engine under load. I would not use full throttle though, and the instructions that come with the product say that as well. You want to let the tuner soak in, then run the boat up on plane for 10-15 minutes at just above min planing speed. That will put the load on the motor needed to burn the carbon off. Depending on how often you decarbon, you may need to repeat several times to get it all out. You'll know you got it all when the motor stops smoking within a minute or so after starting post treatment.

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