So I'm aware of the AA battery method, seafoam, fuel cleaner, etc. methods. Unforunately I've got a set of injectors that are just plain fouled with either particulates, bad gas, or deposits from bad gas. Fortunately, I've got a set of working injectors on the car now. The AA battery method is a huge hack, and it's not necessarily good for injectors as it isn't getting a PWM voltage, but a constant one (bad, and I've already tried it and it didn't work very well), so I've been wondering about a different method.

Would the following work without any issues:

1. Leave working injectors in, everything normal.
2. Pull ignition wire from cylinder #4 on the distributor end.
3. Unclip injector harness from inector #4.
4. Start car, let it idle on 3 cylinders, with #4 good injector doing nothing but sitting there in the fuel rail.
5. Use injector harness #4 manually connected to a bad injector and spray carb cleaner through it collected into a separate container effectively using real PWM output from the car to open/close the bad injector and carb cleaner to clean any serious fouling.
6. Follow with some WD-40 to wash any internal traces of carb cleaner away.
7. Repeat for each bad injector.

Anyone see any issues with this? I'm trying to think of potential safety ones, but besides using carb cleaner in the engine bay while the car is running (people do it all the time for various reasons) I can't really see it being that unsafe as long as it's being collected into something. Idling on 3 cylinders shouldn't hurt anything either.

 

the thing is that old dried up varnished gas is a real beatch to clean.
i clean lots of bike carbs and let me tell you that a lot of times nothing short of putting it in the ultrasonic cleaned works..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mmuller &raquo;</TD></TR><TR><TD CLASS="quote">the thing is that old dried up varnished gas is a real beatch to clean.
i clean lots of bike carbs and let me tell you that a lot of times nothing short of putting it in the ultrasonic cleaned works..</TD></TR></TABLE>

Yep. Although I don't think these injectors are totally trashed, as they *were* working before my last build - but since it took a while, I'm suspecting particulate matter while I had them out, or otherwise bad gas still present on restart. If it doesn't work, I'll just have them professionally dealt with.

 

go by the yamaha dealership and buy their carb clean solution. works amazing.

 

Whats wrong with sending them in for service?

http://kgparts.com/index.php?page=fuelinjectclean

Sounds as if professional cleaning is in order...