Originally Posted by meese
Maybe that's why they looked at me funny when I said Sprag Clutch. Oh well, I thought it might be too good to be true. The bike still starts fine, but I guess I'll pick up some CD-2 just in case.
And maybe a bottle of fuel injector cleaner as well. Got any suggestions for that?
Yep, mention sprag clutch to a BMW mechanic, and they will likely run away screaming.
Injector cleaners are probably like starting an oil thread.
There are many fuel tank additives available for a few bucks a bottle, but these are pretty light duty cleaners, and will help basically help keep injector passages that are not very dirty open longer.
REAL injector cleaners are considerably more expensive, and require some care, equipment, and knowledge to use. These are either high pressure cans containing fuel and concentrated cleaner, used with regulators and hoses to feed the injector rail instead of the vehicle's fuel pump, and the engine run on that for 15-30 minutes. There are also "cannister" systems that use a refillable cannister that is pressurized with regulated compressed air to the correct rail pressure, and the engine run on that.
Putting the light duty cleaners in the fuel every so often certainly cannot hurt, I do that occasionally on all my vehicles. Not sure just how much they really help though, since most gasoline also has some amount of fuel system cleaner in it.
I am having a little problem with a rather persistent code on my 740, "Off Idle fuel mixture control, cyls 1-4", which I am seriously considering getting one of the expensive systems to try out on it. I cannot find anything else wrong, so it may be an injector sticking or leaking. The car runs great, and the plugs look great, no difference in any of them, so I don't think it is serious enough to worry too much about. I replaced the front two oxygen sensors, guess I will now replace the rear two, as they are also now throwing an occasional code. They are suggested as 100,000 mile replacements, and I have over 96K on it. Kinda expensive car to keep up, FOUR oxygen sensors, and TWO catalytic converters. Also, 8 quarts of synthetic oil and a $10 filter means $60 oil changes. Kinda like I felt about the LT though, it is worth it.