I've seen a fair bit of discussion on these forums about concerns with direct injection and valve deposit formation. From the posts I've read it looks like cleaning the depoits off is a difficult thing for a DIYer to do. I couldn't help but wonder if there isn't a simple obvious way to clean the deposits without doing any huge amount of work.
Here's my first idea:
Run a length of nylon tubing from a location in the intake between the throttle plate and the throat of the plenum into the cabin of the vehicle to a closed brass needle valve valve and another length from there to a container with a quart or so of methyl ethyl ketone. Set up a scan tool to watch fuel trims. Warm the engine, then drive on a long stretch of highway. Slowly open the needle valve while monitoring the fuel trims as they go negative. Find a happy position on the valve where trims are between 60% and 80% of the threshhold for setting a p017x code. When the MEK runs out, close the valve and drive home, then disconnect everything.
If I had a DI engine with deposit problems I would try this and use a boroscope to see if it works, but all of my cars have port injection. I don't have shiny new car money.
Any thoughts as to whether or not this would work? Do you think there's any reason to thing this might be harmful? Do you know an easier way that you think would work?
Here's my first idea:
Run a length of nylon tubing from a location in the intake between the throttle plate and the throat of the plenum into the cabin of the vehicle to a closed brass needle valve valve and another length from there to a container with a quart or so of methyl ethyl ketone. Set up a scan tool to watch fuel trims. Warm the engine, then drive on a long stretch of highway. Slowly open the needle valve while monitoring the fuel trims as they go negative. Find a happy position on the valve where trims are between 60% and 80% of the threshhold for setting a p017x code. When the MEK runs out, close the valve and drive home, then disconnect everything.
If I had a DI engine with deposit problems I would try this and use a boroscope to see if it works, but all of my cars have port injection. I don't have shiny new car money.
Any thoughts as to whether or not this would work? Do you think there's any reason to thing this might be harmful? Do you know an easier way that you think would work?
