Installing used injectors... any recommended cleaning? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-18-2006, 01:57 PM   #1
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Default Installing used injectors... any recommended cleaning?

I'm getting some used 25# injectors (don't worry, I have an AFC), and I think they've been sitting unused for a little while. Is there any recommended cleaning or restoring I should do before throwing them on the car? I don't want to install them, only to find out they're gunked up or clogged.
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Old 01-18-2006, 09:12 PM   #2
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Nothing? Nobody???
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Old 01-18-2006, 09:16 PM   #3
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I know how I cleaned mine when I replaced the UIM and lower gaskets...

Don't take it as gospel, but it worked for me. AND, they were already on the motor (not sitting on the shelf for an unknown amount of time).

Anyway, all I did was soak them in a coffee can of gasoline. The tips only. Then, before reinstalled I used new o-rings. I lightly coated the o-rings with a bead of 10w30 Castrol for easy installation.

They were fine before I started and fine afterward. So, not sure if my method actually cleaned them.

Better wait for others to chime in!
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Old 01-18-2006, 09:16 PM   #4
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Been busy. Dunno where all the other goofs are.

Soak them for awhile, stir occasionally to dislodge bubbles and let the injector cleaner permeate completely, and displace moisture/rust.

Then hang them upside down to let them drain back out the filter basket. Ideally, you'd soak them in an ultrasonic cleaner (jewelry cleaner) in injector cleaner. Changing the filter baskets would be a good idea, but you'll need a rebuilder to do this for you.
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Old 01-19-2006, 01:29 AM   #5
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Thanks for the tips, guys.

Bill, when you say to soak them, you mean they need to be completely submerged, correct? Also, are injector rebuilders hard to find, or should I just check the yellow pages?
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Old 01-19-2006, 01:33 AM   #6
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Completely submerged and filled with injector cleaner. Stir around occasionally. Overnight at the least.

Send 'em out here. FIE will turn them around in a week. Vendor'* forum for more details. He'll flow check them dirty for you, then clean (proprietary procedure that I can't divulge regardless of being only mildly drunk at the time), replace the filter baskets, then flow check/match them again. If you send him more than 6, he'* got a much better chance of a good close spread.

I don't know if there are any injector rebuilders in your area. Most dealers, mechanics, and local auto parts stores here deal with FIE. In a normal situation, you'd go through a middle man like that to get them rebuilt. You would not normally deal directly with the rebuilder unless you found one locally that does 'retail' work.
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Old 01-19-2006, 12:08 PM   #7
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I've read about the situation with FIE, and it'* not a bad deal, but I don't have the money to spend. The 25# injectors I bought were originally sold by ZZP, and they were marketed as having been 'ultrasonically cleaned and flowmatched' on their website. In an email they claimed sets to be within 2% flow capacity because they flowmatch such large quantities of injectors. I think they've only been used for a few thousand miles, so they should still be flowing quite nicely, but I want to insure they're good and clean when I install them. I'll use the procedure you described and hope it gets everything.
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Old 01-27-2006, 03:01 AM   #8
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Well, the injectors have been in a B-12 Chemtool bath since this afternoon. I was going to use STP Fuel Injector Cleaner, but B-12 has a little more of the 'paint remover' qualities that I assume would do a better job of removing deposits. I stirred them about 20 minutes ago, and I'll leave them in until tomorrow or Saturday. They seem to be in good shape, and with some new O-rings I'm sure they'll work fine.

Any other thoughts prior to installation on Saturday?
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Old 01-27-2006, 09:45 AM   #9
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Drain them upside-down overnight before installing. Make sure there'* no loose debris in the filter baskets.

Lightly oil the o-rings with WD-40 before install. It'll make it easier.
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Old 01-27-2006, 09:49 AM   #10
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I prefer vasoline on the rings. .. any lube works well though.
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