May be needing to check my injectors soon...
Injector Help Needed
Thread Starter
Intermediate
Joined: Mar 2006
Posts: 30
Likes: 0
From: Hopewell Junction N.Y.
Injector Help Needed
I did an ohm test on the injectors on my wife's '90 L98. With the exception of two injectors, they all came up 16 cold and 17 hot. One came up 13 cold and 13 hot. The scary one came up 31 cold and 26 hot. What do I do next? Thanks in advance for the help. Walt
Pro
Joined: May 2007
Posts: 638
Likes: 1
From: Robesonia Pa
Not sure what the high reading means , but I would suggest to do the research -here with a search on your symptoms. I looked back and found nothing more than you were told to replace the injectors- and you might need to . If you were to post what your symtoms are with your Vette I am sure many people will respond. Sam Lam has a great procedure for replacing your injectors , however you may need to test some things first IMO.
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Walt: I would suggest two thing for you to do on the injector issue.
1. Recheck your readings to see if you get the same values as you did on the first reading.
2. Physically examine your injectors to see if the all look the same. Multec injectors should look like this photo:
It sounds like you have seven Multec injectors (one of which is starting to have shorted coils) and a "rogue" injector from another vehicle. The resistance of the high reistance injector is bass ackwards in that the low value should be cold and the high value should be with a hot part. This is not what your reported in your post.
Let us know what you find.
Bob
1. Recheck your readings to see if you get the same values as you did on the first reading.
2. Physically examine your injectors to see if the all look the same. Multec injectors should look like this photo:
It sounds like you have seven Multec injectors (one of which is starting to have shorted coils) and a "rogue" injector from another vehicle. The resistance of the high reistance injector is bass ackwards in that the low value should be cold and the high value should be with a hot part. This is not what your reported in your post.
Let us know what you find.
Bob
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Have you done a fuel pressure test? Yeah 2 injectors seem funky, but I thought as temps rise resistance falls...am I mistaken on that? None the less, if you have the mutecs it probably time to replace them.
Pro
Joined: Apr 2000
Posts: 696
Likes: 18
From: Jenkintown PA
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Thread Starter
Intermediate
Joined: Mar 2006
Posts: 30
Likes: 0
From: Hopewell Junction N.Y.
INJECTOR HELP NEEDED. part...2
Thanks for the help. The '90 L98 I strongly think is running on 7 cylinders. Runs and idles very bad. I don't know if the injectors have ever been replaced in 87,652 miles. I haven't checked the fuel pressure because I don't have a gauge.
I've gone through all of the posts that I could find on injectors, except archives,I don't know how to get there, and have decided to change injectors. New problem. Do I buy new or rebuilts. In any case what are the best injectors to use in a stock engine? This is very confusing because I've read about red, blue ,yellow tops. Accell,Ford Bosch etc. Asy ou guys can tell I'm in a quandry. Thanks again, Walt
I've gone through all of the posts that I could find on injectors, except archives,I don't know how to get there, and have decided to change injectors. New problem. Do I buy new or rebuilts. In any case what are the best injectors to use in a stock engine? This is very confusing because I've read about red, blue ,yellow tops. Accell,Ford Bosch etc. Asy ou guys can tell I'm in a quandry. Thanks again, Walt
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
from being in the electric motor business for almost 40 years 
Walt: The injectors are relatively easy to change out and takes about 4-5 hours and a only a few special tools are needed. The most difficult part of changing out the injectors is SELECTING what brand/type to put is as replacements for the Multecs. Here is a long thread to begin your education:
http://forums.corvetteforum.com/show...post1560357682
Do some reading and send out some PMs to people for advice. Good hunting!!!
Last edited by Sam Lam; Oct 3, 2007 at 10:05 PM.
