Injector ohm results
Thread Starter
Advanced
Joined: Jun 2007
Posts: 52
Likes: 0
From: Germantown WI
Injector ohm results
Hi,
I have a stock 1995 w/ 6-spd. I ohm'ed the injectors last night and got these values:
Cold: 12.3, 12.4, 12.2, 12.4, 12.4, 12.2, 12.3, 12.3
Hot: 12.8, 12.8, 12.6, 12.8, 12.8, 12.7, 12.8, 12.8
Using the search function, I see that 16.0 is a typical/desired value. I think these injectors are originals. Should I be concerned with the low values? Or happy that all the values are relatively close?
Car is running lean and stumbling badly.
Thanks,
Ron
I have a stock 1995 w/ 6-spd. I ohm'ed the injectors last night and got these values:
Cold: 12.3, 12.4, 12.2, 12.4, 12.4, 12.2, 12.3, 12.3
Hot: 12.8, 12.8, 12.6, 12.8, 12.8, 12.7, 12.8, 12.8
Using the search function, I see that 16.0 is a typical/desired value. I think these injectors are originals. Should I be concerned with the low values? Or happy that all the values are relatively close?
Car is running lean and stumbling badly.
Thanks,
Ron
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Those numbers look great. The 16-17 ohms is mainly for the stock L98 injectors. The LT1 injectors ohm 12-13 ohms as you show. I would look in a different place for the problem, assuming the injectors are not leaking.
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Those are good numbers. The injectors on my '93 are all ~13.2 ohms at cold.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
There is no large change in any value. I also think that 12 ohms might be correct for that year of car. They are going to check a little higher when hot and a ½ ohm is fine. Besides, if an injector is leaking or not spraying right, resistance is not a direct indication of it. The earlier vettes had problems with injectors and when they went bad they measured much lower. The later years gave much less problems.
I would look else where for your problem. I would start with fuel pressure first and perhaps a fuel filter. You might even have some sort of ignition problem. You might check your codes on principal, but on this type of problem will probably show nothing.
What indications are there that is lean.
I would look else where for your problem. I would start with fuel pressure first and perhaps a fuel filter. You might even have some sort of ignition problem. You might check your codes on principal, but on this type of problem will probably show nothing.
What indications are there that is lean.
Last edited by pcolt94; Jul 6, 2007 at 02:53 PM.
Thread Starter
Advanced
Joined: Jun 2007
Posts: 52
Likes: 0
From: Germantown WI
Stumbling engine
Hi,
Thanks for the feedback. According to DataMaster, my Lterm's are running at 135+, occasionally as high as 142 during acceleration.
My DataMaster scan is posted here:
http://www.freefileupload.net/file.p...42306/ron1.uni
I have good fuel pressure both idling and accelerating, based on the fuel gauge being taped to the window and car being driven. (Idle = 42, accelerating = 37-42). Would this rule out a bad fuel filter?
No codes are being thrown.
It's possible this problem started when I went through a car wash which included a underside wash, but I am not sure. Can you suggest other places I should look and/or other tests to be performed?
Thanks for your help!
Thanks for the feedback. According to DataMaster, my Lterm's are running at 135+, occasionally as high as 142 during acceleration.
My DataMaster scan is posted here:
http://www.freefileupload.net/file.p...42306/ron1.uni
I have good fuel pressure both idling and accelerating, based on the fuel gauge being taped to the window and car being driven. (Idle = 42, accelerating = 37-42). Would this rule out a bad fuel filter?
No codes are being thrown.
It's possible this problem started when I went through a car wash which included a underside wash, but I am not sure. Can you suggest other places I should look and/or other tests to be performed?
Thanks for your help!
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
If you don't know when the fuel filter was changed last, I would go ahead and put a new one on. Have you checked your spark plugs, they will give you some more info to go by. Usually a white tip will indicate a lean condition on that cylinder. That could be a clogged injector not spraying, a bad spark plug, or bad plug wire or connection. That would be my next place to look. The 94-96 is sequential fire injection where at the 85-93 is batch/bank fire injection.
Do you have an adjustable fuel pressure regualtor? The fuel pressure looks to be just a tad low. That could be contrubiting to the problem. If it's adjustable, you can try and dial the pressure up a little to see it that helps.
The 95 has a vented opti spark which helps with water evaporation. I reread and see that it started after a engine wash. It's difficult, but you can try and get a hairdryer pointed at the opti and help dry it out. If you can, check the plug wire connections as well.
Others can supply more info.
Do you have an adjustable fuel pressure regualtor? The fuel pressure looks to be just a tad low. That could be contrubiting to the problem. If it's adjustable, you can try and dial the pressure up a little to see it that helps.
The 95 has a vented opti spark which helps with water evaporation. I reread and see that it started after a engine wash. It's difficult, but you can try and get a hairdryer pointed at the opti and help dry it out. If you can, check the plug wire connections as well.
Others can supply more info.
Intermediate
Joined: Jun 2006
Posts: 49
Likes: 0
Rough Running
Check the spark coming out of the coil and the spark to each plug.
Check for fuel pressure at the Schrader valve on the RH side of the fuel runners.
Check the fuses to the injectors and the injector ckt with a noid light. I had a blown fuse to one bank of injectors. The RH exaust manifold was cold because the injectors were not firing.
Check for fuel pressure at the Schrader valve on the RH side of the fuel runners.
Check the fuses to the injectors and the injector ckt with a noid light. I had a blown fuse to one bank of injectors. The RH exaust manifold was cold because the injectors were not firing.
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Le Mans Master
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From: Orlando FL
