Wrong! Fuel Injectors 96 LT4 Help!
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From: Biddeford ME
Wrong! Fuel Injectors 96 LT4 Help!
Ok! So I purchased fuel injectors on eBay for my CE LT4. My first mistake. I had installed a set of excel injectors some time ago and thought I was restoring to OEM LT4 Performance Injectors. NEW fuel injectors Set of 8 ! NOS GM CHEVROLET CORVETTE LT4 1996 Grand Sport. $275.00
I then installed them without verifying the Part Number. My second mistake. The car seemed to run ok for the summer then it blew Inj2 fuse when I went for a redline run. Check the injectors and wiring for a short replaced the fuse and it ran fine. I had run a log file on the test drive and it blew another fuse Inj2. Lots of misfires logged.
Did some research and found that the injectors should be high impedance by they had all measured 2.3 ohms. Looked for the part number found Rochester 17091645. I have been running low impedance injectors.
Long story to get to my question. I obviously need new injectors. I am looking at FIC LT4 Custom Bosch III. I AM HOPING I have not damaged the PCM. The car still runs, that’s a good sign right?
Are the FIC injectors a good choice? Not looking to spend a lot of money, just restore stock performance without the cost of New OEM injectors.
Any advice on testing the PCM would be helpful. Thanks
I then installed them without verifying the Part Number. My second mistake. The car seemed to run ok for the summer then it blew Inj2 fuse when I went for a redline run. Check the injectors and wiring for a short replaced the fuse and it ran fine. I had run a log file on the test drive and it blew another fuse Inj2. Lots of misfires logged.
Did some research and found that the injectors should be high impedance by they had all measured 2.3 ohms. Looked for the part number found Rochester 17091645. I have been running low impedance injectors.
Long story to get to my question. I obviously need new injectors. I am looking at FIC LT4 Custom Bosch III. I AM HOPING I have not damaged the PCM. The car still runs, that’s a good sign right?
Are the FIC injectors a good choice? Not looking to spend a lot of money, just restore stock performance without the cost of New OEM injectors.
Any advice on testing the PCM would be helpful. Thanks
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
Ok! So I purchased fuel injectors on eBay for my CE LT4. My first mistake. I had installed a set of excel injectors some time ago and thought I was restoring to OEM LT4 Performance Injectors. NEW fuel injectors Set of 8 ! NOS GM CHEVROLET CORVETTE LT4 1996 Grand Sport. $275.00
I then installed them without verifying the Part Number. My second mistake. The car seemed to run ok for the summer then it blew Inj2 fuse when I went for a redline run. Check the injectors and wiring for a short replaced the fuse and it ran fine. I had run a log file on the test drive and it blew another fuse Inj2. Lots of misfires logged.
Did some research and found that the injectors should be high impedance by they had all measured 2.3 ohms. Looked for the part number found Rochester 17091645. I have been running low impedance injectors.
Long story to get to my question. I obviously need new injectors. I am looking at FIC LT4 Custom Bosch III. I AM HOPING I have not damaged the PCM. The car still runs, that’s a good sign right?
Are the FIC injectors a good choice? Not looking to spend a lot of money, just restore stock performance without the cost of New OEM injectors.
Any advice on testing the PCM would be helpful. Thanks
I then installed them without verifying the Part Number. My second mistake. The car seemed to run ok for the summer then it blew Inj2 fuse when I went for a redline run. Check the injectors and wiring for a short replaced the fuse and it ran fine. I had run a log file on the test drive and it blew another fuse Inj2. Lots of misfires logged.
Did some research and found that the injectors should be high impedance by they had all measured 2.3 ohms. Looked for the part number found Rochester 17091645. I have been running low impedance injectors.
Long story to get to my question. I obviously need new injectors. I am looking at FIC LT4 Custom Bosch III. I AM HOPING I have not damaged the PCM. The car still runs, that’s a good sign right?
Are the FIC injectors a good choice? Not looking to spend a lot of money, just restore stock performance without the cost of New OEM injectors.
Any advice on testing the PCM would be helpful. Thanks
Last edited by KyleF; Jan 2, 2020 at 09:33 AM.
Thread Starter
Instructor
Joined: Apr 2006
Posts: 109
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From: Biddeford ME
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
They don't list Delphi as an option.
South Bay Does
I have done a lot of reading due to having an L98 with Bosch IIIs. It seems those that are less discriminating are fine with them because their car runs "fine". The people who are tuning and dialing things in have to mess with the settings to truly get the fuel trims optimized. What I have gathered is the aluminum headed cars seem to have less noticeable issues. On the other hand, Delphis are considered direct replacements.
The LT's may also be less sensitive than the L98's... but if I was buying injectors, from what i have read here and at another F-Body forum. I would be getting Delphis.
South Bay Does
I have done a lot of reading due to having an L98 with Bosch IIIs. It seems those that are less discriminating are fine with them because their car runs "fine". The people who are tuning and dialing things in have to mess with the settings to truly get the fuel trims optimized. What I have gathered is the aluminum headed cars seem to have less noticeable issues. On the other hand, Delphis are considered direct replacements.
The LT's may also be less sensitive than the L98's... but if I was buying injectors, from what i have read here and at another F-Body forum. I would be getting Delphis.
Last edited by KyleF; Jan 2, 2020 at 11:03 AM.
Thread Starter
Instructor
Joined: Apr 2006
Posts: 109
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From: Biddeford ME
They don't list Delphi as an option.
South Bay Does
I have done a lot of reading due to having an L98 with Bosch IIIs. It seems those that are less discriminating are fine with them because their car runs "fine". The people who are tuning and dialing things in have to mess with the settings to truly get the fuel trims optimized. What I have gathered is the aluminum headed cars seem to have less noticeable issues. On the other hand, Delphis are considered direct replacements.
The LT's may also be less sensitive than the L98's... but if I was buying injectors, from what i have read here and at another F-Body forum. I would be getting Delphis.
South Bay Does
I have done a lot of reading due to having an L98 with Bosch IIIs. It seems those that are less discriminating are fine with them because their car runs "fine". The people who are tuning and dialing things in have to mess with the settings to truly get the fuel trims optimized. What I have gathered is the aluminum headed cars seem to have less noticeable issues. On the other hand, Delphis are considered direct replacements.
The LT's may also be less sensitive than the L98's... but if I was buying injectors, from what i have read here and at another F-Body forum. I would be getting Delphis.
thanks
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
Yes, but flow is rated at pressure too don't forget. I would suggest calling South Bay or FIC and discussing it with them. I am not saying the Bosch IIIs are junk, won't work, or not to buy them. I am just saying a word of caution from my reading.
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From: Biddeford ME
I agree, my stock pressure is 43.5 lbs on my LT4. That’s what the FIC injectors are designed for. I will give them a call before I order to verify no reprograming required. Thanks for the advice.
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Just pulling from memory, but I think
92-93 were 22lb
94-96 LT1 were 24 lb
and LT4 was 28
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Burning Brakes
Joined: Apr 2009
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From: Charlotte Michigan
Jon will take care of your needs. I have a set of bosch 4's that flow a little more than 3's. Hsd them in my ruby. Had fic rechecked them both and decided to stay with the 3's.
the 3's will not need the retainer clip, the 4's will.
I think flow rate for the 3's are about the same as the originals at approx. .248.
The 4's .298. that was for my lt1.
the 3's will not need the retainer clip, the 4's will.
I think flow rate for the 3's are about the same as the originals at approx. .248.
The 4's .298. that was for my lt1.
Last edited by scotth48; Jan 2, 2020 at 03:08 PM. Reason: Add to
Thread Starter
Instructor
Joined: Apr 2006
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From: Biddeford ME
Drifting
Joined: Jun 2018
Posts: 1,678
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From: Michigan
Last edited by KyleF; Jan 2, 2020 at 03:51 PM.
Thread Starter
Instructor
Joined: Apr 2006
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From: Biddeford ME
Correct, be careful about "flows more" you are aiming to get a direct replacement. Also, should be noted, and I am pretty sure this is where issues arrive from, flow at pressure isn't perfectly linear. If you stay within the bounds of the ECM being able to adjust shouldn't be an issue. Also, Voltage offset (latency) - or the time it actually takes from sending the signal to when the injector actually opens can cause issues if they are not set correctly. FWIW, I found reference to the LT4 being 26lb/hr but it did not specify pressure. I would assume this to be at 43.5, but you know what they say about assuming.
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From: Biddeford ME
I’ll be going with FIC LT4 Custom 26# injectors.
According to FIC, “The orig literature that gm put out had 28 and the engine put out more hp than the ls1 that was coming in 97. Gm actually de tuned the lt4 before production by using a different cam and making the ports smaller, if you look at a lt4 early head you will see where they filled it and re machined it. Hence using a 26 lb injector.”
FIC rocks...
According to FIC, “The orig literature that gm put out had 28 and the engine put out more hp than the ls1 that was coming in 97. Gm actually de tuned the lt4 before production by using a different cam and making the ports smaller, if you look at a lt4 early head you will see where they filled it and re machined it. Hence using a 26 lb injector.”
FIC rocks...
Last edited by jrbollman; Jan 2, 2020 at 11:04 PM.
Le Mans Master
Joined: Apr 2000
Posts: 5,713
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From: Manassas VA
I’ll be going with FIC LT4 Custom 26# injectors.
According to FIC, “The orig literature that gm put out had 28 and the engine put out more hp than the ls1 that was coming in 97. Gm actually de tuned the lt4 before production by using a different cam and making the ports smaller, if you look at a lt4 early head you will see where they filled it and re machined it. Hence using a 26 lb injector.”
FIC rocks...
According to FIC, “The orig literature that gm put out had 28 and the engine put out more hp than the ls1 that was coming in 97. Gm actually de tuned the lt4 before production by using a different cam and making the ports smaller, if you look at a lt4 early head you will see where they filled it and re machined it. Hence using a 26 lb injector.”
FIC rocks...
Wow, thats a story I have never heard before.....
Not sure if you have seen this site. Lots of good info on it for LT4 owners. https://www.grandsportregistry.com/lt1vslt4.htm
Thread Starter
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From: Biddeford ME
Wow, thats a story I have never heard before.....
Not sure if you have seen this site. Lots of good info on it for LT4 owners. https://www.grandsportregistry.com/lt1vslt4.htm
The Registry site lists #28 Delphi PN 17124251 which is discontinued on GM parts sites. I did find it listed on Ecklers for 150.99 each. My local Chevy dealer gave me AC Delco PN 19146007 which I can find on GM parts sites for 179.00 reduced to 99.00 each.
I have not found the flow rating for 19146007, but my money is on 26#. I would like to verify that, still looking.
Last edited by jrbollman; Jan 3, 2020 at 09:06 AM.
Le Mans Master
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From: near the thumb in the mitten
The PCM grounds the injectors, there's no box to plug into to test it. The PCM isn't going to hurt the new injectors. I think you will have to wait until injectors are changed and see how car runs.
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From: Biddeford ME
We will see...
Thread Starter
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From: Biddeford ME
ok! Here is the decision...
ACCEL 150826 Fuel Injectors - 26 lb/hr - EV1 Minitimer - High Impedance - 8-Pack 287.00 on eBay.
I had these before and they work great.
OR Would the Bosch be even greater?
FIC Bosch III LT4 Custom rebuilt 209.00
https://fuelinjectorconnection.com/c...l-injector-set
Advice please.
ACCEL 150826 Fuel Injectors - 26 lb/hr - EV1 Minitimer - High Impedance - 8-Pack 287.00 on eBay.
I had these before and they work great.
OR Would the Bosch be even greater?
FIC Bosch III LT4 Custom rebuilt 209.00
https://fuelinjectorconnection.com/c...l-injector-set
Advice please.
Last edited by jrbollman; Jan 4, 2020 at 12:46 PM.
Thread Starter
Instructor
Joined: Apr 2006
Posts: 109
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From: Biddeford ME
ok! Here is the decision...
ACCEL 150826 Fuel Injectors - 26 lb/hr - EV1 Minitimer - High Impedance - 8-Pack 287.00 on eBay.
I had these before and they work great.
OR Would the Bosch be even greater?
FIC Bosch III LT4 Custom rebuilt 209.00
https://fuelinjectorconnection.com/c...l-injector-set
Advice please.
ACCEL 150826 Fuel Injectors - 26 lb/hr - EV1 Minitimer - High Impedance - 8-Pack 287.00 on eBay.
I had these before and they work great.
OR Would the Bosch be even greater?
FIC Bosch III LT4 Custom rebuilt 209.00
https://fuelinjectorconnection.com/c...l-injector-set
Advice please.
Another thought... is there any advantage to running these low impedance injectors? I have researched using a VersaFueler for 269.00. The injectors I have (PN 17091645) are 27 lbs low impedance Rochester injectors.
Last edited by jrbollman; Jan 4, 2020 at 04:56 PM.
