Us 91 steel blue'ers have to stick together!
Injector #s = the problem?
Thread Starter
Instructor
Joined: Oct 2004
Posts: 208
Likes: 1
From: Santa Rosa CA
Injector #s = the problem?
’89, 114k miles, I bought it new. Recently started to run ruff, fed it new plugs/cap/rotor which historically fixed the ruff problem. A little better only. Checked resistance of injectors: 7, 17, 5, 10, 17,17 7,3 ohms. I believe they are Multecs and are not known to last forever. I am going with failing injectors as the problem. MidAmeric has self-cleaning for $519 or Accel for $329. Looks like I have to take a few parts off to get to them, does not look as bad as the heater core though. I have fair skills but have not changed injector. Any comments or tricks in the replacement? 
Racer
Joined: Oct 2003
Posts: 475
Likes: 21
From: CLAREMONT Ca
Originally Posted by george4
’89, 114k miles, I bought it new. Recently started to run ruff, fed it new plugs/cap/rotor which historically fixed the ruff problem. A little better only. Checked resistance of injectors: 7, 17, 5, 10, 17,17 7,3 ohms. I believe they are Multecs and are not known to last forever. I am going with failing injectors as the problem. MidAmeric has self-cleaning for $519 or Accel for $329. Looks like I have to take a few parts off to get to them, does not look as bad as the heater core though. I have fair skills but have not changed injector. Any comments or tricks in the replacement?
Race Director
Joined: May 2006
Posts: 10,691
Likes: 71
From: Phoenix Arizona
If the resistance varies, cleaning won't help. I just cleaned the injectors on my 92 ZR-1(16, ouch) with great results. My 89 had a couple of bad injectors 6@17, 2@3, so I replaced them with Mustang 23lb'ers ($200 new), they work great, no modifications necessary. Pull the plenum and you should be able to change them fairly easily, although you may have to loosen the pass side runners to get the rail up far enough. Make sure you have no leaks after you put it together, lube the o rings well before installing.
Thread Starter
Instructor
Joined: Oct 2004
Posts: 208
Likes: 1
From: Santa Rosa CA
Originally Posted by zr1fred
If the resistance varies, cleaning won't help. I just cleaned the injectors on my 92 ZR-1(16, ouch) with great results. My 89 had a couple of bad injectors 6@17, 2@3, so I replaced them with Mustang 23lb'ers ($200 new), they work great, no modifications necessary. Pull the plenum and you should be able to change them fairly easily, although you may have to loosen the pass side runners to get the rail up far enough. Make sure you have no leaks after you put it together, lube the o rings well before installing.
Race Director
Joined: May 2006
Posts: 10,691
Likes: 71
From: Phoenix Arizona
Type of lubrication isn't that important (some recomend vasoline), the important thing is DON'T put them in dry, and use NEW upper o-rings. Visual inspection is best, and run it for a little while before you drive it to make sure they don't start leaking. The injctors should turn fairly easily in their bores after you put it all together. If they don't, you may have a o-ring problem.
Drifting
Joined: Jun 2005
Posts: 1,781
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From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
I just went through this a while back . U lube the o-rings with engine oil . To check to see if there we're any leaks I just put the injectors on the fuel rail , then mounted the fuel rail on the engine ( like your putting back together ) , Hook back up the fuel lines and then turn key to on position to pressurize the rail . once u have pressure make sure your not leaking from anywhere. Forum Member Sam Lamb has a write up of how to remove the injectors with out taking the runners off. I didn't do it this way but wish i would have what a pain it was . Wasn't hard by any means just time consuming and a bit frustrating for me ( it was my first real project for the Vette or any car for that matter )
Good luck , Patsfan
Good luck , Patsfan
Last edited by patsfan; Jul 7, 2006 at 09:04 AM.
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Thread Starter
Instructor
Joined: Oct 2004
Posts: 208
Likes: 1
From: Santa Rosa CA
Originally Posted by patsfan05488
I just went through this a while back . U lube the o-rings with engine oil . To check to see if there we're any leaks I just put the injectors on the fuel rail , then mounted the fuel rail on the engine ( like your putting back together ) , Hook back up the fuel lines and then turn key to on position to pressurize the rail . once u have pressure make sure your not leaking from anywhere. Forum Member Sam Lamb has a write up of how to remove the injectors with out taking the runners off. I didn't do it this way but wish i would have what a pain it was . Wasn't hard by any means just time consuming and a bit frustrating for me ( it was my first real project for the Vette or any car for that matter )
Good luck , Patsfan
Good luck , Patsfan
