Fuel injector swap problem
06-29-2017, 06:14 PM
#11
Let me go see if I can find them and what I maybe broke taking them off. If you do get these, I would recommend having someone help you pulse these injectors with a brake cleaner straw stuck in them. They have been sitting a really long time.
06-30-2017, 11:42 AM
#13
Thread Starter
Join Date: Mar 2017
Location: British Columbia
Posts: 11
yes and no. Yes they will physically swap but since the condition of the swapped ones is different than the original ones in there, the computer has to relearn the fuel trims. That and you have now installed unmatched fuel injectors. Matching is where the supplier matches the flow rate of all the injectors to be within a certain % of each other. Matching yields more consistent performance and can actually improve MPG.
so
When fuel injectors are so far out of tolerance with each other it can cause some performance issues that in most cases will sort themselves out.
I bet if you hooked up a live data capable OBDII scanner and watched the fuel trims on the side you just replaced, your short term fuel trim settings will be jumping all over the place.
If you haven't already, disconnect your negative terminal for about 15 minutes to reset your ECM, this forces the car to use the default fuel trim table and learn a new one quicker vs trying to rewrite an existing table.
After you've done that, let it idle at temp for two minutes, turn on the AC at full blast and let it sit for two more minutes at idle (if you're an auto, put it in Drive with your foot on the brake too). This resets the idle fuel trim and timing. After that's done drive it around the block a few times and see how it responds then.
so
When fuel injectors are so far out of tolerance with each other it can cause some performance issues that in most cases will sort themselves out.
I bet if you hooked up a live data capable OBDII scanner and watched the fuel trims on the side you just replaced, your short term fuel trim settings will be jumping all over the place.
If you haven't already, disconnect your negative terminal for about 15 minutes to reset your ECM, this forces the car to use the default fuel trim table and learn a new one quicker vs trying to rewrite an existing table.
After you've done that, let it idle at temp for two minutes, turn on the AC at full blast and let it sit for two more minutes at idle (if you're an auto, put it in Drive with your foot on the brake too). This resets the idle fuel trim and timing. After that's done drive it around the block a few times and see how it responds then.
06-30-2017, 02:06 PM
#15
Gentleman's Relish
Join Date: Feb 2005
Location: AZ
Posts: 13,090
http://forums.corral.net/forums/5-0-...tor-specs.html
Same era and applications but slightly different. Since you're using 4/4 of each that could be the issue. Again fuel injectors should be matched. You have a mismatch at this point.
Same era and applications but slightly different. Since you're using 4/4 of each that could be the issue. Again fuel injectors should be matched. You have a mismatch at this point.
06-30-2017, 03:47 PM
#16
Yeah, if you have those two injectors, they won't work together. I also wonder if anyone has data on using the 4 hole injectors.
When tuning an engine for our year models, injector high slope, low slope, breakpoint, offset vs. battery voltage has to be changed at a bare minimum. I would bet that those injectors don't have the same data.
In other words, better atomization is good. But without a chip, I don't think your computer will be able to take advantage of it. Theoretically you should see an increase in fuel efficiency with the 4 hole injectors.
Then again, if by some chance the data isn't that far off, they may work IF you have all the same injectors. Mixing and matching won't work with those.
When tuning an engine for our year models, injector high slope, low slope, breakpoint, offset vs. battery voltage has to be changed at a bare minimum. I would bet that those injectors don't have the same data.
In other words, better atomization is good. But without a chip, I don't think your computer will be able to take advantage of it. Theoretically you should see an increase in fuel efficiency with the 4 hole injectors.
Then again, if by some chance the data isn't that far off, they may work IF you have all the same injectors. Mixing and matching won't work with those.
Last edited by TrimDrip; 06-30-2017 at 03:59 PM.
06-30-2017, 06:25 PM
#17
Thread Starter
Join Date: Mar 2017
Location: British Columbia
Posts: 11
Yeah, if you have those two injectors, they won't work together. I also wonder if anyone has data on using the 4 hole injectors.
When tuning an engine for our year models, injector high slope, low slope, breakpoint, offset vs. battery voltage has to be changed at a bare minimum. I would bet that those injectors don't have the same data.
In other words, better atomization is good. But without a chip, I don't think your computer will be able to take advantage of it. Theoretically you should see an increase in fuel efficiency with the 4 hole injectors.
Then again, if by some chance the data isn't that far off, they may work IF you have all the same injectors. Mixing and matching won't work with those.
When tuning an engine for our year models, injector high slope, low slope, breakpoint, offset vs. battery voltage has to be changed at a bare minimum. I would bet that those injectors don't have the same data.
In other words, better atomization is good. But without a chip, I don't think your computer will be able to take advantage of it. Theoretically you should see an increase in fuel efficiency with the 4 hole injectors.
Then again, if by some chance the data isn't that far off, they may work IF you have all the same injectors. Mixing and matching won't work with those.
