Fuel Injectors
Thread Starter
Advanced
Joined: Dec 2020
Posts: 79
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From: RI
Fuel Injectors
I changed my injectors and fuel filter this week and I put 23lb injectors Accel. The corvette is a 1993 will these injectors be okay it appears to operate fine but I hear of a lot of people putting 24lb injectors. I think the stock injectors for a 1993 are 22lbs
Melting Slicks
Joined: May 2003
Posts: 2,078
Likes: 283
From: Dyersburg TN
the computer has the ability to adjust within a limited range. As long as you have not moved that far from stock it should be able to adjust. Get too wild and you will need to have your chip reprogramed.
Racer
Joined: Sep 2001
Posts: 365
Likes: 93
From: Chesterfield VA
Yes and no, I think the 23 will probably be ok and 24 maybe. The computer thinks you have a 22 in it so it will always fuel for a 22 but it will get a lean reading from the O2 and then add some fuel on the trim side. This is not the best way to do it. What would be better would be to get a adjustable fuel regulator and not just enough pressure down to make the injector flow correctly. Using the 23 or 24 I don't think I would sweat it too much.
Heel & Toe
Joined: Feb 2026
Posts: 22
Likes: 0
From: Tampa Bay, Florida
Yes and no, I think the 23 will probably be ok and 24 maybe. The computer thinks you have a 22 in it so it will always fuel for a 22 but it will get a lean reading from the O2 and then add some fuel on the trim side. This is not the best way to do it. What would be better would be to get a adjustable fuel regulator and not just enough pressure down to make the injector flow correctly. Using the 23 or 24 I don't think I would sweat it too much.
Melting Slicks
Joined: Jul 2005
Posts: 2,230
Likes: 302
Yes and no, I think the 23 will probably be ok and 24 maybe. The computer thinks you have a 22 in it so it will always fuel for a 22 but it will get a lean reading from the O2 and then add some fuel on the trim side. This is not the best way to do it. What would be better would be to get a adjustable fuel regulator and not just enough pressure down to make the injector flow correctly. Using the 23 or 24 I don't think I would sweat it too much.
An adjustable regulator would force him to run a lower fuel pressure to compensate, which then makes the fuel atomization less efficient.
That said, the OP needs to mindful that the flow rate is not the only thing the ECM needs to know about the injectors...
https://www.corvetteforum.com/forums...-from-fic.html
There injector characteristics that can also cause headaches if not properly accounted for as well.
And to see all of this, you'd want to get a datalogger like TunerproRT so you can actually see what the ECM is seeing and doing in reaction to the injectors.
Heel & Toe
Joined: Feb 2026
Posts: 22
Likes: 0
From: Tampa Bay, Florida
I will have to call them to get this information. They are Bosch type 3-24lb injectors which were specked out for the 1993 Corvette LT-1. I know they have 4 spray holes instead of 3 like the OEM.
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Le Mans Master
Joined: Dec 2005
Posts: 8,586
Likes: 972
From: Communist Colorado
I just replaced mine with the same injectors from FIC. EXCEPT... mine are 22lb/hr The car runs great. The only change I notice is it takes a couple of seconds longer to start than with the old injectors.With the old ones, there was zero delay from when you hit the key... almost freakishly fast... now its a few engine rotations then it fires. Still runs just fine. I imagine less fuel is sprayed into the chamber with the new 4 hole design in comparison to the single hole multecs...
Melting Slicks
Joined: Jul 2005
Posts: 2,230
Likes: 302
I just replaced mine with the same injectors from FIC. EXCEPT... mine are 22lb/hr The car runs great. The only change I notice is it takes a couple of seconds longer to start than with the old injectors.With the old ones, there was zero delay from when you hit the key... almost freakishly fast... now its a few engine rotations then it fires. Still runs just fine. I imagine less fuel is sprayed into the chamber with the new 4 hole design in comparison to the single hole multecs...
Heel & Toe
Joined: Feb 2026
Posts: 22
Likes: 0
From: Tampa Bay, Florida
I have my vette at the shop and even though I bypassed the starter side of VATS, it still is not allowing the injectors to fire. They are in the process of having it reprogrammed to delete all the VATS features. Hope it works.
Thread Starter
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Joined: Dec 2020
Posts: 79
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From: RI
J Abbott I think you may have solved my 2.5 year SES light and code 44 Lean left bank. After 2.5 years I did a fuel pressure test 32lb -34 lbs car off with no pressure down it stays at 32lbs. Car running stays a 32-33 lbs under acceleration stays at 32-33. Regulator has been replaced about 1 year ago along with fuel pump that is fueling up when key is turned on. Due to the injectors being 23 vs stock 22 I made need the adjustable fuel regulator to correct this problem. The 23lbs are probably not getting enough fuel and it's running lean its the only thing I can think of after reading your response to my post on 10/31/2023. The regulator does not show any signs of being faulty. I am checking the pressure due to the last time I took the car out about a week ago it started drove to my location it sat for an hr. started and I traveled a short distance shutting the car off and it would not start appeared to be not getting fuel. Sat for a while called AAA and while waiting on the phone it started but once moving it appeared to be starving for fuel. Same scenario happened when I shut off pumped gas and would not start just cranked like it wasn't getting fuel. Waited and it started. If you have any ideas would be appreciated.
Heel & Toe
Joined: Feb 2026
Posts: 22
Likes: 0
From: Tampa Bay, Florida
I put Bosch III 24lb Injectors on my 93 LT-1. At the fuel rail with key off I had 41lbs of pressure. Time for a new fuel pump assembly and adjustable fuel pressure regulator.
All the best!
All the best!
Thread Starter
Advanced
Joined: Dec 2020
Posts: 79
Likes: 24
From: RI
I have just put a Aeromotive fuel PR and the pressure is better than the one that was in there. The one that was in there was running with key on about 40-42 lbs with car on about 44-46. The Aeromotive is about 48 running and 50 with key in the on position. I thought the problem I was having last week was the FPR due to just cranking and not starting once warm thought may be fuel pressure. Happened to me twice once at the gas station waited and finally started. After putting in the FPR today car was cold started drove for a test drive ran great put in garage and went to start about 2 minutes later and was only cranking. Waited about 10 minutes it started seems it may be the opti spark but I am not getting any opti-spark codes.
Heel & Toe
Joined: Feb 2026
Posts: 22
Likes: 0
From: Tampa Bay, Florida
It could be your VATS system not reading the key OHMS correctly. You can find how to bypass it on You Tube,, its easy, and a good thing to do so when it does not read it, you can still start it.. The old VATS system was not 100% anyway. I think I paid $30 on ebay for a plug and play bypass..
Racer
Joined: Sep 2001
Posts: 365
Likes: 93
From: Chesterfield VA
Actually I think it's the opposite. ECM is delivering a pulsewidth for smaller injectors, so he'll get more fuel delivered for that pulsewidth. His trims will then show rich.
An adjustable regulator would force him to run a lower fuel pressure to compensate, which then makes the fuel atomization less efficient.
That said, the OP needs to mindful that the flow rate is not the only thing the ECM needs to know about the injectors...
https://www.corvetteforum.com/forums...-from-fic.html
There injector characteristics that can also cause headaches if not properly accounted for as well.
And to see all of this, you'd want to get a datalogger like TunerproRT so you can actually see what the ECM is seeing and doing in reaction to the injectors.
An adjustable regulator would force him to run a lower fuel pressure to compensate, which then makes the fuel atomization less efficient.
That said, the OP needs to mindful that the flow rate is not the only thing the ECM needs to know about the injectors...
https://www.corvetteforum.com/forums...-from-fic.html
There injector characteristics that can also cause headaches if not properly accounted for as well.
And to see all of this, you'd want to get a datalogger like TunerproRT so you can actually see what the ECM is seeing and doing in reaction to the injectors.