[Wolf 335]

Originally Posted by tommisch

Wow my car does all of that �� mabye all i need to do is get them coded?

Thank you for update. Will check again in a year for the skeptics out there.

[Wolf 335]

Originally Posted by Salzamani

In case you’re curious about my experience too. Had that index 12 rebuilt injector in cylinder 1. All the rest were original index 1’s. I never had an issue with the mixed injectors. The idle was absolutely perfect. Acceleration was perfect. Be sure your plugs and coil packs are also in good shape. I sold the 335i about 4 months ago. Not for any special reason I was simply over it, just wanted a more comfortable car. If it was a manual I would have probably kept it. It always felt like something was missing with an automatic. Like my hand was always on the shifter and I wanted to change the gears... no problem at all to mix the injectors in any way or form. Don’t let anyone tell you different. Just be sure to code it with the correct flow rate just like you would with any injector.

Be sure to read this whole thread. There is a lot of key information.

Thanks for the update. Forgot you did the same.

What car did you end up getting?

[SixSix]

Originally Posted by tommisch

Wow my car does all of that 😨 mabye all i need to do is get them coded?

Possibly, odds are they are already coded properly and it's an issue with the injector. I spent quite a while trying to figure out why my car was making the raspy noise down low, then finally swapped my engine and coded the injectors properly and it stopped.

Then Vehicle Virals posted a video a week later that highlighted that issue, he got new injectors and got them coded and it sounded fine after that. I don't think it's a very common issue but AFAIK it relates to age/coding of the injectors.

Might be worth picking up some Index 12s just for the peace of mind because who knows what kind of damage and wear could be caused by injectors causing that exhaust pitch.

[tommisch]

Originally Posted by SixSix

Possibly, odds are they are already coded properly and it's an issue with the injector. I spent quite a while trying to figure out why my car was making the raspy noise down low, then finally swapped my engine and coded the injectors properly and it stopped.

Then Vehicle Virals posted a video a week later that highlighted that issue, he got new injectors and got them coded and it sounded fine after that. I don't think it's a very common issue but AFAIK it relates to age/coding of the injectors.

Might be worth picking up some Index 12s just for the peace of mind because who knows what kind of damage and wear could be caused by injectors causing that exhaust pitch.

After I posted my first message I actually went and looked at my injectors, they were index 12 . Thought they would be older since I didn't see any receipts of new ones from the past 2 years. Anyway I checked the values and they were coded right. My next move is changing the injector on cylinder 2 since it was the only cylinder with a wet plug, if that doesn't work I guess I'll just start replacing them one by one until I find the one causing the annoying sound.

[Salzamani]

Originally Posted by Wolf 335

Thanks for the update. Forgot you did the same.

What car did you end up getting?

An 06 Scion tC. at least it’s a manual.

[virtual_law]

Originally Posted by Salzamani

Hello again!

Just to give you an update. I replaced only one leaky cylinder 1 injector over 2 months ago. It’s solved my rough idle issues and improved my fuel economy about 10%. My N54 fires up faster than ever not that it ever had an issue. The spark plug now looks dry and clean. I put in an index 12 and coded it using INPA. All of my other 5 injectors are index1’s. The car pulls normal and you would never know that I have mixed injectors because it runs absolutely perfect. Just do it!

Edit: Just read you sold your 335 a few months ago, my bad. But here's what's happening to mine.

Gonna replace my cylinder 4 injector in a couple of days. My '07 e93 335i starts up normally, cold or hot. Drives fine up until 2000 rpm, i.e if I keep it below 2000 rpm no misfires. If I give it just the tiniest bit of throttle and go above 2000 rpm, instant injector cut-out, misfire, but weirdly, NO engine light. It keeps doing that till I shut the car off and restart, and everything becomes normal again like the problem never happened. Changed out plugs a few days ago when this problem surfaced. Car is bone stock so I'm guessing the injectors are Index 1s. Will mix and only replace one like you did.

[Salzamani]

Originally Posted by virtual_law

Edit: Just read you sold your 335 a few months ago, my bad. But here's what's happening to mine.

Gonna replace my cylinder 4 injector in a couple of days. My '07 e93 335i starts up normally, cold or hot. Drives fine up until 2000 rpm, i.e if I keep it below 2000 rpm no misfires. If I give it just the tiniest bit of throttle and go above 2000 rpm, instant injector cut-out, misfire, but weirdly, NO engine light. It keeps doing that till I shut the car off and restart, and everything becomes normal again like the problem never happened. Changed out plugs a few days ago when this problem surfaced. Car is bone stock so I'm guessing the injectors are Index 1s. Will mix and only replace one like you did.

I had my 335i do that to me and it was a coil pack. I think you have a bad one in there. Just change all of them get them from FCP Euro comes with lifetime replacement warranty. Get the Eldor brand they are the best. Get the coil packs if the problem is gone then great you’re set. If the problem is not gone then you can return them.

I would definitely do what I said above before anything else. Now in the event it wasn’t A bad coil pack and you did need to replace a injector, yes you can replace one only with the index 12 if you want. I did that. All were index 1 except for the one I replaced with 12. I left a link to Ebay where I bought the one I got. It always performed just fine. Be sure to read this whole thread it explains in my other post where I bought it on eBay and The importance of entering the flow rate of the new injector. You can use INPA to enter the Flow rate values of the new injector. There are videos on how to do that on YouTube. I believe Lee from BMW Fanatics has one. You will need INPA it’s a program that runs on your laptop. You’ll need a cable to connect your car OBD2 to the laptop. The cable you gotta buy. I got mine from BimmerGeeks. They helped me install INPA as well.

First things first replace all 6 coil packs. I think that is your actual problem with what you described. You can switch the cylinder 4 coil pack with say cylinder 2 and see if the misfire moves to cylinder 2. If so it’s the coil pack. You can also do the same with the injectors. Be careful pulling out the injectors there is a special tool for it for a reason because you can’t just go crazy prying it out. Research the different careful ways to pull out an N54 injector.

[virtual_law]

Originally Posted by Salzamani

I had my 335i do that to me and it was a coil pack. I think you have a bad one in there. Just change all of them get them from FCP Euro comes with lifetime replacement warranty. Get the Eldor brand they are the best. Get the coil packs if the problem is gone then great you’re set. If the problem is not gone then you can return them.

I would definitely do what I said above before anything else. Now in the event it wasn’t A bad coil pack and you did need to replace a injector, yes you can replace one only with the index 12 if you want. I did that. All were index 1 except for the one I replaced with 12. I left a link to Ebay where I bought the one I got. It always performed just fine. Be sure to read this whole thread it explains in my other post where I bought it on eBay and The importance of entering the flow rate of the new injector. You can use INPA to enter the Flow rate values of the new injector. There are videos on how to do that on YouTube. I believe Lee from BMW Fanatics has one. You will need INPA it’s a program that runs on your laptop. You’ll need a cable to connect your car OBD2 to the laptop. The cable you gotta buy. I got mine from BimmerGeeks. They helped me install INPA as well.

First things first replace all 6 coil packs. I think that is your actual problem with what you described. You can switch the cylinder 4 coil pack with say cylinder 2 and see if the misfire moves to cylinder 2. If so it’s the coil pack. You can also do the same with the injectors. Be careful pulling out the injectors there is a special tool for it for a reason because you can’t just go crazy prying it out. Research the different careful ways to pull out an N54 injector.

Wow your response couldn't have come at a sexier time! Thank you! I was right in the midst of watching a Vehicular DIY video on changing injectors and coding with INPA, and your tip to engage BimmerGeeks is a godsend cause I was also inclined towards some Amazon choices which do come highly rated. I just learnt of INPA last night. heh

As for the diagnosis, so my new spark plugs were checked today and 3 of them are fouling. Mechanic also doubts two coil packs, so the plot has thickened. But you're right, I should start with the coil packs cause I do intend to do an Mhd somewhere down the line (just for those 0 rpm burbles) so it would make sense to renew now.

With regards to Coils, should I only replace the 2 bad ones or replace em all in one go?

[Salzamani]

Originally Posted by virtual_law

Wow your response couldn't have come at a sexier time! Thank you! I was right in the midst of watching a Vehicular DIY video on changing injectors and coding with INPA, and your tip to engage BimmerGeeks is a godsend cause I was also inclined towards some Amazon choices which do come highly rated. I just learnt of INPA last night. heh

As for the diagnosis, so my new spark plugs were checked today and 3 of them are fouling. Mechanic also doubts two coil packs, so the plot has thickened. But you're right, I should start with the coil packs cause I do intend to do an Mhd somewhere down the line (just for those 0 rpm burbles) so it would make sense to renew now.

With regards to Coils, should I only replace the 2 bad ones or replace em all in one go?

Replace all. Get the Eldor brand. Something like Coil Packs or plugs be sure to buy from FCP Euro. If you don’t know anything about them. Look into it. They are god sent. Even your most service item (engine oil) has a lifetime replacement warranty. You pay for it one time as long as you own you car you will get free oil. You just gotta pay for return shipping. look into it. Now your plugs fouling? Yes it could be your injectors. Just replace the bad ones. New ones are very expensive now. Last I looked a year ago FCP had remanufactured index 12’s also for less. Lifetime replacement on those too. You’re planning on tuning your car. You better take advantage of FCP. Lol! Yeah subscribe to Vicular DIY too. No one is more thorough. That dude has replaced every part on the E90 more then once. Yeah be sure to get that INPA from either BeemerGeeks or someone like them. Only get it if they can give you remote assistance so that they can help you with the install on the laptop. That INPA install can get complicated where it might be over your head. The guy that helped me from BeemerGeeks name was Dylan. He was great. I was so happy with the remote assistance I kicked down a tip for him using PayPal.

[lee.j.hill]

I have owned my bmw e93 325 3L for aorund 18 months Ive only recently started having cold start issues when I pulled my injectors out i have 4 @ revision 7 1 @ 9 and 1 @ 11

they clearly can be mixed I am misfiring on 2 cylinders so I have ordered 2 new injectors on revision 11

[thefrog1394]

FWIW my 335i is now at 215k miles with mixed injectors (4 of the 6 are the original index 1 injectors) and (knock on wood) no issues whatsoever. Well injector related at least... my tranny throws a 4F8D (5-4 gear change slip) code after long trips these days.

Originally Posted by thefrog1394

Another anecdote of mixing injectors being fine. I swapped an Index 1 injector for an index 12 without issue. One other injector was replaced by the previous owner a while back (Index 9 I think). The rest are still index 1's. Car seems to run fine, and its been about 10k miles (car has about 185k on it now).

I will say, I do have a bit of a weird surging (similar to this) as well as an occasional RPM hunt at idle on cold start. I don't think this is due to the injector mismatch, but can't rule it out, so figured I'd mention it.

On a low mileage car that you plan to keep for another 100k miles then I'd replace all with new index 12's. But for me, at almost 200k miles, on a car worth a few grand, even 1 $250 injector is a lot of money to put into this car.

[Troytheboy]

I'm needing to change injector 1 and am wanting to know if… let's say it's index 5 could I swap it out for a index 9 that I have spear ??? Any help is great thanks First post

[iqraceworks]

Originally Posted by Troytheboy

I'm needing to change injector 1 and am wanting to know if… let's say it's index 5 could I swap it out for a index 9 that I have spear ??? Any help is great thanks First post

Yes.....there are no issues with swapping injectors. BUT....you have to code the new injector in properly with the correct data that's printed on the injector. I use PROTOOL for this.