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Old 07-31-2017, 07:11 PM   #1
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Default injector cleaning?

Anyone ever diy this? If so what solvents did you use. Or was it ultrasonic cleaning? My new TBI engine has a spray pattern for shit. Rock Auto has reman injectors at 25 each which is tempting but figured I would ask. Or is there a local guy?
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Old 07-31-2017, 10:14 PM   #2
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For $25 just get the reman, which really are just cleaned, ohm checked, new inlet screens, then spray tested, but sending yours out to be cleaned will cost as much or more than the RA ones.

How are you checking pattern while it's spraying? Only way I've found is with a strobe light to 'freeze' it.

As far as cleaning you'd need to fab up a self contained fuel cell with an adjustable pressure regulator and pump on it as the real cleaners aren't compatible with stuff in the fuel tank. GM X66 is one of the better readily available cleaners, on Amazon in the pint size under X66P. I've used it for induction cleaning (suck it like seafoam) and piston soaking on my Mazda. It works very well in that role, I imagine as an injector cleaning solution it also works well. I believe they say to use a 10% solution.

By the time you build your own rig or pay a shop to do it, you'll have spent more than the $65 or so those reman will cost you with shipping. Just mind the injector connector wiring, it gets pretty crispy on those things being bathed in fuel vapor for decades at a time. Those engines are sensitive to fuel pressure so make sure that's right on and lazy EGR problems were pretty common too, the valves like to not totally close.
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Old 08-01-2017, 08:04 AM   #3
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For $25 just get the reman, which really are just cleaned, ohm checked, new inlet screens, then spray tested, but sending yours out to be cleaned will cost as much or more than the RA ones.

How are you checking pattern while it's spraying? Only way I've found is with a strobe light to 'freeze' it.

As far as cleaning you'd need to fab up a self contained fuel cell with an adjustable pressure regulator and pump on it as the real cleaners aren't compatible with stuff in the fuel tank. GM X66 is one of the better readily available cleaners, on Amazon in the pint size under X66P. I've used it for induction cleaning (suck it like seafoam) and piston soaking on my Mazda. It works very well in that role, I imagine as an injector cleaning solution it also works well. I believe they say to use a 10% solution.

By the time you build your own rig or pay a shop to do it, you'll have spent more than the $65 or so those reman will cost you with shipping. Just mind the injector connector wiring, it gets pretty crispy on those things being bathed in fuel vapor for decades at a time. Those engines are sensitive to fuel pressure so make sure that's right on and lazy EGR problems were pretty common too, the valves like to not totally close.
I can see it running on TBI. I've dealt with enough of these to say the pattern is off. They tend to be a straight walled cone when running right, these aren't. Also mileage is shit as is power. While part of that may be a clogged catalyst, these more than likely caused the clogged catalyst.
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Old 08-01-2017, 12:21 PM   #4
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Sounds like you've got a potential cause there. Hard to beat the Rock Auto price.
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Old 08-01-2017, 12:28 PM   #5
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Saw someone clean injectors with a 9volt battery and a can of carb and choke cleaner with the sprayer ripped off. Might work on the cheap.
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Old 08-01-2017, 10:31 PM   #6
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Soaked them in some brake cleaner for a day, we'll see what happens. I didn't pulse them, but I may do so later. I have some extra cores, so no big loss if I thrashed them esp if I get remans anyways.

I also took the whole TBI assembly apart, then dipped it up in a can of carb cleaner. Not perfect, but better. Now all I need to do is port the TBI unit, get the gasket kit and stick it back on.
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Old 08-01-2017, 11:01 PM   #7
 
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Saw someone clean injectors with a 9volt battery and a can of carb and choke cleaner with the sprayer ripped off. Might work on the cheap.
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Old 08-01-2017, 11:32 PM   #8
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Get some X66 anyway though, stuff is snakeoil that actually does work. When I piston soaked my Mazda it went in green and came out black with crumbs of loose carbon when I sucked it up with the mighty-vac. It's never ran smoother since I got it either.
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