Quick question
Thread Starter
Drifting
Joined: Jun 2005
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From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
ok so i wnet out to do it ( Multimeter in hand ) . How do you get the plugs off from the injectors ( I'm afraid im going to break something )
Thanks again ,, PatsFan
Thanks again ,, PatsFan
Le Mans Master
Joined: Oct 2003
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From: seattle WA
You may want to check your injector pigtails too. When I was searching for a miss I ohmed the injectors etc. all checked good, but when I used a noid light I found one of my injector pigtails was bad.
It was pretty simple to fix-to check it with a noid light ( I think a 12V test light may also work) I disconnected all the injector pigtails, then one by one attached my noid light-cranked the engine and watched the light pulse-that's how I found the little stinker was bad.
It was pretty simple to fix-to check it with a noid light ( I think a 12V test light may also work) I disconnected all the injector pigtails, then one by one attached my noid light-cranked the engine and watched the light pulse-that's how I found the little stinker was bad.
Drifting
Joined: May 1999
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From: Sacramento, CA Money can't buy happiness - but it's more comfortable to cry in a Corvette than a Yugo.
You should check with the car cold and then again after it has been driven and brought up to operating temp. (Again turned off.) Sometimes heat will affect the windings and the resistance values will change. They shouldn't change much if any. The 88 FSM Chart A-3 specifies 10 ohms or more cold, so if one is below 10 ohms hot or cold, that injector is in need of replacement.
Thread Starter
Drifting
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From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
Thanks for the help guys I just checked them cold and the readings were all over the place . I'm going for a ride and will test them hot to see what happens . I'll post my results when I get back I'll probably start a new thread or post it in my running rich thread .
Thanks , Patsfan
Thanks , Patsfan
Le Mans Master
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From: Orlando FL
I just got to ask this. Your going into an area requireing a level of effort in a semi sensitive area. Why are you doing this, what is your actual problem. Why would you think a fuel injector is not operating. Perhaps with a little more information we can assist you in a better way as to get you to the proper area or other things to check. Injectors classically dont open up resistance wise and I would think you are not going to find anything out of the ordinary. 
Thread Starter
Drifting
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From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
Originally Posted by pcolt94
I just got to ask this. Your going into an area requireing a level of effort in a semi sensitive area. Why are you doing this, what is your actual problem. Why would you think a fuel injector is not operating. Perhaps with a little more information we can assist you in a better way as to get you to the proper area or other things to check. Injectors classically dont open up resistance wise and I would think you are not going to find anything out of the ordinary.
I have been trouble shooting my problem for a bit . Heres the link so you can check it out .
http://forums.corvetteforum.com/show....php?t=1352434
Thanks for the help and input
PatsFan
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Thread Starter
Drifting
Joined: Jun 2005
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From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
Heres a link to a new thread with my OHM readings on it .
http://forums.corvetteforum.com/show...post1554961736
Thanks for all the help guys
PatsFan
http://forums.corvetteforum.com/show...post1554961736
Thanks for all the help guys
PatsFan
Le Mans Master
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From: Orlando FL
Now that I have read some of your threads I remember reading them a few days ago and thinking - wow. Well let me just say according to my GM book for a 94 it says the injectors are 12 ohms, all 8 of them.
You need to disconnect the pigtails to get an accurate reading, I hope you did it that way. I don't know if you have the same injectors I do but I would assume the resistance would be somewhere close to that also. Understand a sticky or leaky injector can have the resistance check good. Hope this info is helpful.
You need to disconnect the pigtails to get an accurate reading, I hope you did it that way. I don't know if you have the same injectors I do but I would assume the resistance would be somewhere close to that also. Understand a sticky or leaky injector can have the resistance check good. Hope this info is helpful.
Team Owner
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From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
OK, so the numbers are all over the place for the injectors, and there's a recommendation on the other thread to replace several if not all of them. And pcolt sez/asks if you've disconnected the pigtail in your checking the injectors in order "...to get an accurate reading."
So what now? What's next?
So what now? What's next?
Thread Starter
Drifting
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From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
I think I'm going to replace the injectors . I put a post in the part for sale section here saying I was looking for injectors . jd_v3tt3 left a message how he had a set of replacement oem ones he never installed that he would sell me for a very fair price. I just have to figure out if I'm going to tackle the injector job or If i'll have my mechanic do it .
Thanks again guys , PatsFan
Thanks again guys , PatsFan
Last edited by patsfan; Apr 20, 2006 at 11:29 PM.
Thread Starter
Drifting
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From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
Originally Posted by pcolt94
You need to disconnect the pigtails to get an accurate reading, I hope you did it that way. I don't know if you have the same injectors I do but I would assume the resistance would be somewhere close to that also. Understand a sticky or leaky injector can have the resistance check good. Hope this info is helpful.
If i messed this up ( Which i wouldn't doubt
) let me know please . Thanks again guys , PatsFan
Drifting
Joined: May 1999
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From: Sacramento, CA Money can't buy happiness - but it's more comfortable to cry in a Corvette than a Yugo.
You did the test correctly.
Replacing the injectors that you have in there with a new good set will give you a whole new car. Really, a whole new car. You will be so much happier with the car and yourself for doing all the troubleshooting work to get it right. Let us know when you get it done.
Replacing the injectors that you have in there with a new good set will give you a whole new car. Really, a whole new car. You will be so much happier with the car and yourself for doing all the troubleshooting work to get it right. Let us know when you get it done.
Le Mans Master
Joined: Jan 2006
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From: Orlando FL
I always like to take a step back and look at data to see if it feels right. Nothings imposible, and keep an open mind, seen alot over the years that dont make sence. Have repalced some injectors over the years but not generally for a bad resistance reading.
Can somebody tell tell me why so many injectors could be bad at one time with resistance readings all over the place. I realize windings can short or coils can open but I would think that would be a unique situation. I have measured my own and got 12 ohms.
Assuming he has 12 ohm injectors only one is close at 13 ohms. I would like to know if someone has seen this many injectors bad at one time as common place and has it been a recurring problem for vets (or GM products).
Can somebody tell tell me why so many injectors could be bad at one time with resistance readings all over the place. I realize windings can short or coils can open but I would think that would be a unique situation. I have measured my own and got 12 ohms.
Assuming he has 12 ohm injectors only one is close at 13 ohms. I would like to know if someone has seen this many injectors bad at one time as common place and has it been a recurring problem for vets (or GM products).
Thread Starter
Drifting
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From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
I think I can answer this . From what I have read and heard here some of 1989's and all of 1990 and 1991 have what you would call A Rochester Multics Injector . There are Junk from what I have been told . Some-places will even refuse to clean /check them . I have also read that if you use fuel injector cleaner with them ( Just the Rochester's Multics from 89-91 ) it will do some thing to deteriate them . I don't know how the resistance works and whet it means its bad.
Thanks fro your input and I hope this is the problem I'm having . Any-thing more and I go into my exhaust budget
PatsFan
Thanks fro your input and I hope this is the problem I'm having . Any-thing more and I go into my exhaust budget
PatsFan
Drifting
Joined: May 1999
Posts: 1,478
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From: Sacramento, CA Money can't buy happiness - but it's more comfortable to cry in a Corvette than a Yugo.
Originally Posted by pcolt94
I always like to take a step back and look at data to see if it feels right. Nothings imposible, and keep an open mind, seen alot over the years that dont make sence. Have repalced some injectors over the years but not generally for a bad resistance reading.
Can somebody tell tell me why so many injectors could be bad at one time with resistance readings all over the place. I realize windings can short or coils can open but I would think that would be a unique situation. I have measured my own and got 12 ohms.
Assuming he has 12 ohm injectors only one is close at 13 ohms. I would like to know if someone has seen this many injectors bad at one time as common place and has it been a recurring problem for vets (or GM products).
Can somebody tell tell me why so many injectors could be bad at one time with resistance readings all over the place. I realize windings can short or coils can open but I would think that would be a unique situation. I have measured my own and got 12 ohms.
Assuming he has 12 ohm injectors only one is close at 13 ohms. I would like to know if someone has seen this many injectors bad at one time as common place and has it been a recurring problem for vets (or GM products).
Even the 88 Vettes had injector problems. It is my understanding that GM replaced many sets of injectors under warranty in the 88 year Vettes due to poor manufacturer quality. The original version was Bosch ("RP" logo on injector side) which was to be replaced by Lucas ("CAV" logo on injector side).