Injectors on one side not working.
Thread Starter
Cruising
Joined: Jan 2007
Posts: 10
Likes: 0
Injectors on one side not working.
Let me preface this by saying I am no mechanic. I have a 1989 L-98. Currently it will crank, but runs like s#%t! I have narrowed the problem down to the fuel injectors on the drivers side. With the car running, I unplugged all four injectors on that side - no change in the way the car was running. Like I said, I'm not a mechanic so I don't know where to look from here. I have had it in two shops. They don't even want to fool with it. (I can't afford to pay them either!) I am hoping someone here may have some experience they can share.
Instructor
Joined: May 2002
Posts: 249
Likes: 0
From: Corvettes ruined my life. CA
If all 4 of your injectors go bad at once you should go play the lottery right now because that would be very rare. That being said it sounds like the drivers side injector harness is the first place I would look for the problem.(ie..broken and or grounded wires.)
Instructor
Joined: May 2002
Posts: 249
Likes: 0
From: Corvettes ruined my life. CA
Oh, and I forgot to mention.... Do not assume that it is the injectors without testing the plugs and wires for spark and eleminating them or verifing them as the problem. I am an ASC certifed master tech and before I changed careers to IT I worked as a auto tech for 15 years so you can trust my advise.
If you need it I can im you my phone# so we can work the problem more efficently.
If you need it I can im you my phone# so we can work the problem more efficently.
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
Let me preface this by saying I am no mechanic. I have a 1989 L-98. Currently it will crank, but runs like s#%t! I have narrowed the problem down to the fuel injectors on the drivers side. With the car running, I unplugged all four injectors on that side - no change in the way the car was running. Like I said, I'm not a mechanic so I don't know where to look from here. I have had it in two shops. They don't even want to fool with it. (I can't afford to pay them either!) I am hoping someone here may have some experience they can share.
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
Oh, and I forgot to mention.... Do not assume that it is the injectors without testing the plugs and wires for spark and eleminating them or verifing them as the problem. I am an ASC certifed master tech and before I changed careers to IT I worked as a auto tech for 15 years so you can trust my advise.If you need it I can im you my phone# so we can work the problem more efficently.
If you need it I can im you my phone# so we can work the problem more efficently.
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
Basically you disco the harness from the injector then read the resistance from one terminal to the other. It is not a comprehensive test. It will only show one that has failed electrically. If you see any in or below the 12 Ohm range suspect it.
FIC will hook you up with Bosch Designe III injectors all 8 for about $170 (check with them to be sure of pricing) and these are compatible with E15 (15% alcohol fuel) whereas the original ones are not.
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Supporting Vendor
Joined: Mar 2008
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From: Cumming Ga
Safety Car
Joined: Jan 2008
Posts: 3,939
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From: Vero Beach Florida
Simple to do and first place to start. It’s a step by step process to get to problem. Then get a node test light make sure you have a pulse at injectors, then try disconnecting one at a time see if idle improves, then ohm test them hot & cold . You can also listen to them using a long screw driver or probe while car is running you should hear a clicking sound. Good Luck
6th Gear
Joined: Sep 2018
Posts: 6
Likes: 0
here is one for you I have a 1985 corvette it only fires the new injectors on the left side there is no ground coming out of the ecm to make them fire they tell me the ecm is good there is a new fuel pump new cam lifters timing chain gears distributor couple of new sensors if I cross the ground from the right to the left the car will run not very well but it will what is the problem now with this car why wont the right injectors fire like they should I cant find what is wrong
Team Owner
Joined: Jul 2004
Posts: 28,432
Likes: 3,285
From: Hartford WI
here is one for you I have a 1985 corvette it only fires the new injectors on the left side there is no ground coming out of the ecm to make them fire they tell me the ecm is good there is a new fuel pump new cam lifters timing chain gears distributor couple of new sensors if I cross the ground from the right to the left the car will run not very well but it will what is the problem now with this car why wont the right injectors fire like they should I cant find what is wrong
Go to Autozone and borrow THIS. That will make sure you are having the issue. The side that doesn't light up, make sure that the wires are good. If you have accidently cut it, you will have an issue. Ask me how I know. You might have to run the wire all the way to the ECM by doing a pinout test for continuity.
6th Gear
Joined: Sep 2018
Posts: 6
Likes: 0
like I said there is no ground coming form the ecm there is however power on both sides everything should be working as it should but it is not what could be the possible problem why is the ecm not sending a ground signal to the right side left side fires fine can jump a wire from left to right and get the car to run not right but it will run had the ecm tested and they say it ok bought a new one put it in and the injectors stick wide open they have constant ground and power this car is a nightmare lol
