Topic: Issues with 19# injector swap

[YJ KiD]

i have the other set of injectors out of that donor car that came out of (bought from him awhile back) and haven't put them yet.  That could expain why no one else is having the issues he is.   

[FourbangerYJ]

i have the other set of injectors out of that donor car that came out of (bought from him awhile back) and haven't put them yet.  That could expain why no one else is having the issues he is.   

When I get things sorted out I can send you any injectors that left over and good to you if you have any problems.

[sharpxmen]

I think the real question is why is he the only one having trouble?

maybe 2 out of 8 are bad, not unheard of i guess

just to clarify, that flow would be just fine, very close to stock with better atomization so he shouldn't have any problems running the injectors. As far as increased performance with those (like in more HP), if the flow rating i found is correct probably not so much.

[YJ KiD]

not so worried about the confusion. . .have faith that u will make it right in the end, wish i could install mine to see if i was going to have the same issues but not an option my jeep is on loan to a family member who wa without a vechicle for another month or 2 so let me know what u guys figure out and i will keep following the progress and troubleshooting your working on

[YJ KiD]

i just checked the cobra injectors that u sent me and the P/N is exact bosch number as the the injector that is 18.25 so the ones that i have are not a 19# so Fourbanger u might check yours and your CEL problems could be that u couldd have them mixed up running some of the 18.25's and some of  the true 19#'s that would cause a different amount of fuel correct? might be your rough idle, might be worth checking 

[YJake]

I decided to put my Gen II 19lbs. injectors in today and they all worked just fine. I had a connector issue with injector one but that's just due to a bad contact on the connector itself, some electrical contact clean and a little wire jiggling later and I had it running just fine.

It seems to accelerate smoother, but this could be due to the fact that these injectors were rebuilt and not just some junkyard injectors. Thus, making them an improvement over my 140k mile stock ones.

I will say for a fact that I can accelerate past 3k RPM better than before. That needle increases steadily until it hits 3k and then it takes off to 4k RPM before slowly increasing again. (Of course I rarely take it past 4k RPM). The only other mods I have done are the 4.0TB and Taurus fan mods. (In contrast, these mods seemed to help my Low-End power)

So over all, it gave me a smoother and quicker acceleration as well as some more Hi-End boost in the 3-4k range. No difference down low though. (That I could feel anyway)

[sharpxmen]

I decided to put my Gen II 19lbs. injectors in today and they all worked just fine. I had a connector issue with injector one but that's just due to a bad contact on the connector itself, some electrical contact clean and a little wire jiggling later and I had it running just fine.

It seems to accelerate smoother, but this could be due to the fact that these injectors were rebuilt and not just some junkyard injectors. Thus, making them an improvement over my 140k mile stock ones.

I will say for a fact that I can accelerate past 3k RPM better than before. That needle increases steadily until it hits 3k and then it takes off to 4k RPM before slowly increasing again. (Of course I rarely take it past 4k RPM). The only other mods I have done are the 4.0TB and Taurus fan mods. (In contrast, these mods seemed to help my Low-End power)

So over all, it gave me a smoother and quicker acceleration as well as some more Hi-End boost in the 3-4k range. No difference down low though. (That I could feel anyway)

i think the improvement would be noticeable in open loop since in closed loop (low to mid range with partial throttle) the mixture is adjusted by your PCM based on O2 feedback - in time will get back to stock when in closed loop as the computer will adjust the fuel trims slowly towards minimum based on what it learns from the O2 sensor, however they should be better atomization of the fuel so you should see some better mileage as well (probably not too much but there should be some).

[YJake]

If I get even a 1mpg increase I'll be excited 

[FourbangerYJ]

I decided to put my Gen II 19lbs. injectors in today and they all worked just fine. I had a connector issue with injector one but that's just due to a bad contact on the connector itself, some electrical contact clean and a little wire jiggling later and I had it running just fine.

It seems to accelerate smoother, but this could be due to the fact that these injectors were rebuilt and not just some junkyard injectors. Thus, making them an improvement over my 140k mile stock ones.

I will say for a fact that I can accelerate past 3k RPM better than before. That needle increases steadily until it hits 3k and then it takes off to 4k RPM before slowly increasing again. (Of course I rarely take it past 4k RPM). The only other mods I have done are the 4.0TB and Taurus fan mods. (In contrast, these mods seemed to help my Low-End power)

So over all, it gave me a smoother and quicker acceleration as well as some more Hi-End boost in the 3-4k range. No difference down low though. (That I could feel anyway)

Well I am glad it worked out for you. I had a feeling it would since your injectors were tested and cleaned.

[FourbangerYJ]

I found a local company that can flow test and clean injectors. Not sure on price yet. I might send these to get cleaned up depending on price.

[FourbangerYJ]

I found a local company that can flow test and clean injectors. Not sure on price yet. I might send these to get cleaned up depending on price.

It's $15.00 each to test, and clean. Might think about it. Its more to clean and test than what I paid for them. But atleast I would know they are good. 

Thoughts?

[sharpxmen]

It's $15.00 each to test, and clean. Might think about it. Its more to clean and test than what I paid for them. But atleast I would know they are good. 

Thoughts?

hmm, you can test them yourself - you have 8, i'm sure you'll come up with 4 good ones out of those. You can also flow match them which is what is recommended for second hand injectors.

[FourbangerYJ]

hmm, you can test them yourself - you have 8, i'm sure you'll come up with 4 good ones out of those. You can also flow match them which is what is recommended for second hand injectors.

Not really. From looking at a E-bay bid they show PICS of how they test theirs. It looks like without the right equipment gas would get all over the place.
I could take a bunch of time and play musical injectors but I am not in the mood to do that.

[FourbangerYJ]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=280412162235&viewitem=&_trkparms=tab%3DWatching

They show PICS of the testing in this auction.

[sharpxmen]

Not really. From looking at a E-bay bid they show PICS of how they test theirs. It looks like without the right equipment gas would get all over the place.
I could take a bunch of time and play musical injectors but I am not in the mood to do that.

just thinking you could save some $$$, that's all - but of course it's up to you.

you could use a bottle and stick the injector tip inside - weigh the bottle before and after to get the flow (use a stop watch to time it). for checking how well it atomizes the fuel use a jar with a bigger opening and look at the jet pattern - you could tell pretty easy if it squirting or drips. You only do one injector at a time, always open (not cranking the motor) by using 1 injector pigtail.

Of course you can always have them tested but i was thinking 15x8=$120, you can probably get a set of 4 brand new injectors for that amount if not a set of almost new for even less than that.