whats the best way of cleaning injectors
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whats the best way of cleaning injectors
I took my injectors out and now i am trying to clean them. i soaked them in acsetone for about 15 minutes, alot of dirt came out but im convinced they are still gummed up.
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If the injectors are for a '91, and are origial Multecs, you might want to get them out of the acetone. The insulating varnish on the solenoid coils might not tolerate the acetone very long before breaking down and failing.
A good way to clean one of these is to remove the inlet screen and pintle cap, then reverse-flush it under pressure by powering the solenoid. Then flush the injetor in the forward direction by the same method until the spray pattern is uniform. You might not want to operater the solenoid continuously, since it could overheat and fail, so plan on duty-cycling the injector.
If you have a graduated cylinder and a stopwatch, you can perform a crude flow test of each injector by timing the solenoid "on" time and measuring the liquid results.
Of course, you'll have to use a solvent with a bit lower flammability than gasoline, and with the ability to dissolve gum, varnish, and fuel additive residues. A petroleum solvent with some alcohols, inhibitors, and probably some butyl cellusolve mixed in might do nicely.
When you're finished, install clean inlet screens and clean, undamaged pintle caps on all the injectors. It probably would be a good idea to replace the 'O' rings when installing them. You can get an 'O' ring kit from GM for around $25.
Or, you could send them off to a service and have that all done for you for about $125.
A good way to clean one of these is to remove the inlet screen and pintle cap, then reverse-flush it under pressure by powering the solenoid. Then flush the injetor in the forward direction by the same method until the spray pattern is uniform. You might not want to operater the solenoid continuously, since it could overheat and fail, so plan on duty-cycling the injector.
If you have a graduated cylinder and a stopwatch, you can perform a crude flow test of each injector by timing the solenoid "on" time and measuring the liquid results.
Of course, you'll have to use a solvent with a bit lower flammability than gasoline, and with the ability to dissolve gum, varnish, and fuel additive residues. A petroleum solvent with some alcohols, inhibitors, and probably some butyl cellusolve mixed in might do nicely.
When you're finished, install clean inlet screens and clean, undamaged pintle caps on all the injectors. It probably would be a good idea to replace the 'O' rings when installing them. You can get an 'O' ring kit from GM for around $25.
Or, you could send them off to a service and have that all done for you for about $125.
Thread Starter
Junior Member
Joined: Feb 2007
Posts: 29
Likes: 0
If the injectors are for a '91, and are origial Multecs, you might want to get them out of the acetone. The insulating varnish on the solenoid coils might not tolerate the acetone very long before breaking down and failing.
A good way to clean one of these is to remove the inlet screen and pintle cap, then reverse-flush it under pressure by powering the solenoid. Then flush the injetor in the forward direction by the same method until the spray pattern is uniform. You might not want to operater the solenoid continuously, since it could overheat and fail, so plan on duty-cycling the injector.
If you have a graduated cylinder and a stopwatch, you can perform a crude flow test of each injector by timing the solenoid "on" time and measuring the liquid results.
Of course, you'll have to use a solvent with a bit lower flammability than gasoline, and with the ability to dissolve gum, varnish, and fuel additive residues. A petroleum solvent with some alcohols, inhibitors, and probably some butyl cellusolve mixed in might do nicely.
When you're finished, install clean inlet screens and clean, undamaged pintle caps on all the injectors. It probably would be a good idea to replace the 'O' rings when installing them. You can get an 'O' ring kit from GM for around $25.
Or, you could send them off to a service and have that all done for you for about $125.
A good way to clean one of these is to remove the inlet screen and pintle cap, then reverse-flush it under pressure by powering the solenoid. Then flush the injetor in the forward direction by the same method until the spray pattern is uniform. You might not want to operater the solenoid continuously, since it could overheat and fail, so plan on duty-cycling the injector.
If you have a graduated cylinder and a stopwatch, you can perform a crude flow test of each injector by timing the solenoid "on" time and measuring the liquid results.
Of course, you'll have to use a solvent with a bit lower flammability than gasoline, and with the ability to dissolve gum, varnish, and fuel additive residues. A petroleum solvent with some alcohols, inhibitors, and probably some butyl cellusolve mixed in might do nicely.
When you're finished, install clean inlet screens and clean, undamaged pintle caps on all the injectors. It probably would be a good idea to replace the 'O' rings when installing them. You can get an 'O' ring kit from GM for around $25.
Or, you could send them off to a service and have that all done for you for about $125.
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From: Schererville , IN
Car: 91 GTA, 91 Formula, 89 TTA
Engine: all 225+ RWHP
Transmission: all OD
Axle/Gears: Always the good ones
Anything I've tried to clean stock injectors in either of my 91's just made them worse. Anything eats the windings up in those things.
Have u even ohmed them out to see what they read.
Above 12 is good per GM. Stock ones should be at or near 17. If u have more variance than 2 or so on the set I would pitch them and tell u to find new injectors.
Been there and done that a few times :-) It always ended up the same way on 91's.
later
Jeremy
Have u even ohmed them out to see what they read.
Above 12 is good per GM. Stock ones should be at or near 17. If u have more variance than 2 or so on the set I would pitch them and tell u to find new injectors.
Been there and done that a few times :-) It always ended up the same way on 91's.
later
Jeremy
Supreme Member
Joined: Jan 2003
Posts: 1,931
Likes: 1
From: Ontario, Canada
Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
Transmission: T-5 World Class
Acetone is a realll BAD thig to use. I wioped my safety glasses with them to clean them off. It melted them ... well just melted the lense enough to know they were junk . You probably ruined them by doing that. Also don't put it in your gas tank either. It melts the lille sock filter aswell.
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