Bad injectors???
Thread Starter
Instructor
Joined: Sep 2002
Posts: 198
Likes: 0
From: VA BEACH VA
Bad injectors???
How can you tell if your injectors are really bad. Through the process of elimination, I am guessing this is going to be my problem. I have used an OHMS meter to test resistance across each one and got a reading on all 8 of them of 9 on the 1X scale on the meter. You can hear what sounds like them firing and feel them pulsing when you put put your finger on them. My fuel pressure is good all of my plugs, wires, cap, rotor and fuel filter have just been replaced and it is still running rough at idle and when the throttle is advanced.
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
How can you tell if your injectors are really bad. Through the process of elimination, I am guessing this is going to be my problem. I have used an OHMS meter to test resistance across each one and got a reading on all 8 of them of 9 on the 1X scale on the meter. You can hear what sounds like them firing and feel them pulsing when you put put your finger on them. My fuel pressure is good all of my plugs, wires, cap, rotor and fuel filter have just been replaced and it is still running rough at idle and when the throttle is advanced.
Team Owner
Joined: Jan 2003
Posts: 20,306
Likes: 242
From: Summerland B.C. Canada
Did you do any pressure tests ?
What OHM numbers, did you get ?
You vette came with problematic injectors, there is a very good chance that they may be failing.
Jon at FIC can hook you up with reasonably priced injectors, if you find the need.
He has a sticky at the top of the tech section, have a look at it.
What OHM numbers, did you get ?
You vette came with problematic injectors, there is a very good chance that they may be failing.
Jon at FIC can hook you up with reasonably priced injectors, if you find the need.
He has a sticky at the top of the tech section, have a look at it.
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
How can you tell if your injectors are really bad. Through the process of elimination, I am guessing this is going to be my problem. I have used an OHMS meter to test resistance across each one and got a reading on all 8 of them of 9 on the 1X scale on the meter. You can hear what sounds like them firing and feel them pulsing when you put put your finger on them. My fuel pressure is good all of my plugs, wires, cap, rotor and fuel filter have just been replaced and it is still running rough at idle and when the throttle is advanced.
Melting Slicks
Joined: Dec 2004
Posts: 3,284
Likes: 51
From: Jacksonville, FL
St. Jude Donor '08 thru '26
just some added data
If you have a big miss then check the plugs to see if it looks like gas is getting to the cylinders. I agree with Jon in that it is strange for all your ohm readings to be the same.
Or, if you have a scanner you can look to the fuel numbers the scanner gives you at idle in closed loop. If you have a FSM, in the 6E section there is a page that is a "snap shot" of what a normal motor looks like on a scanner. Just compare the info and post up the differences for us to look at so we can help diagnose the issue.
I would also say that the early mulitech injectors, before 92 or 93, were not designed to work with the methanol in the gas now. The result is that the methanol attacks the insulating epoxy in the coils and shorts them out causing the injector not to fire.
Tom
Or, if you have a scanner you can look to the fuel numbers the scanner gives you at idle in closed loop. If you have a FSM, in the 6E section there is a page that is a "snap shot" of what a normal motor looks like on a scanner. Just compare the info and post up the differences for us to look at so we can help diagnose the issue.
I would also say that the early mulitech injectors, before 92 or 93, were not designed to work with the methanol in the gas now. The result is that the methanol attacks the insulating epoxy in the coils and shorts them out causing the injector not to fire.
Tom
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