Could this be a sign of leaky injectors no codes but maybe signs???

Mightbaal

Specialist
Apr 22, 2018
76
12
0
Ride
2008 335xi E90
Alright well first off please don't flame me but I am on index 5 and index 8 injectors it's like 5-8-8-8-5-8 or something like that. I called my dealer and they said they replaced my injectors in 2011 under warranty (my car is a 2008). My car runs fine on startup but I have weird issues that are rare. First off I am FBO+inlets+E60 gas with a BEF stock turbos running 22 psi midrange and 17-18 redline (whatever they can do). On single 3rd or 4th gear pulls from low rpm my AVG_IGN will get to like .1 or sometimes even 0.0. Now when I step on the gas shifting through gears mainly the 2nd to 3rd shift the AVG_IGN will start to rise pretty high I have seen it get to 3.0 sometimes. Also I have a weird problem when I am driving where I am just normally driving let of gas and press it back down slightly and it will jolt slightly like i tapped the brakes for a split second. It's very rare that this happens and sometimes it will be like maybe once or twice a week and only happens at lower speeds. Other than that the car drives great. What do you guys think? I am putting it off as a BEF issue the slight jolt that's rare. I have done alot of mainetence on this car since I owned it I am a DIY guy car has 78k on it. New hpfp was done 2 years ago with the water pump right after at 54k (literally within 24 hours lol). I have no codes besides the catless dps detected codes.
 
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Jeffman

Captain
Jan 7, 2017
1,498
549
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Hey Might,
Your service history sounds almost exactly the same as mine. I just pulled out four index 6 (original from 2008) and two index 8 (from 2011 warranty) and replaced them all with index 12. My car now runs SO much better. One thing I noticed is I’m able to hit my AFR targets much better - previously my fuel trims would peg to 34 at WOT at ~5300 rpm, now they don’t, meaning fueling is vastly improved with the new injectors. So I really recommend upgrading your injectors first and then chase down any remaining issues afterwards.
Good luck!
 

Mightbaal

Specialist
Apr 22, 2018
76
12
0
Ride
2008 335xi E90
Hey Might,
Your service history sounds almost exactly the same as mine. I just pulled out four index 6 (original from 2008) and two index 8 (from 2011 warranty) and replaced them all with index 12. My car now runs SO much better. One thing I noticed is I’m able to hit my AFR targets much better - previously my fuel trims would peg to 34 at WOT at ~5300 rpm, now they don’t, meaning fueling is vastly improved with the new injectors. So I really recommend upgrading your injectors first and then chase down any remaining issues afterwards.
Good luck!


I have an aftermarket warranty technically wonder if they would cover the injectors cuz they are expensive my mods might stand in the way plus how would the dealer would be able to diagnose bad or leaky injectors...
 

Mightbaal

Specialist
Apr 22, 2018
76
12
0
Ride
2008 335xi E90
Just don't want to waste more money on maps and the cost of a dealership to diagnose it then the warranty denying it anyways...
 
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