Injectors

hasanchaudhry · 09-04-2023, 02:50 AM

2008 335xi mhd stage 1 91 octane
Q. Can I run index 12 on cyl 1-3 and index 09 on cyl 4-6.
Current situation:
I just got this car. I checked and saw that there is a mix of index injectors on the car the ones on the vehicle currently are as follows

cyl 1 index 09
cyl 2 index 12
cyl 3 index 02
cyl 4 index 12
cyl 5 index 02
cyl 6 index 09

My current issue is the car shakes on startup and when I accelerate the car is sluggish.

AWD Addict · 09-04-2023, 02:11 PM

Any fouled plugs?

If you're running the same index in each bank (and they were properly coded) you are okay.

Cloverdale · 09-04-2023, 06:54 PM

Lot's of us are running different index's in the same bank with no issues.

Hoody007 · 09-04-2023, 08:23 PM

Quote:

Originally Posted by hasanchaudhry

2008 335xi mhd stage 1 91 octane
Q. Can I run index 12 on cyl 1-3 and index 09 on cyl 4-6.
Current situation:
I just got this car. I checked and saw that there is a mix of index injectors on the car the ones on the vehicle currently are as follows

cyl 1 index 09
cyl 2 index 12
cyl 3 index 02
cyl 4 index 12
cyl 5 index 02
cyl 6 index 09

My current issue is the car shakes on startup and when I accelerate the car is sluggish.

Could be any number of things. Mismatched injectors by themselves aren't the issue, but leaky injectors (those index 9s are pretty awful) definitely could be. Could also be bad coils, leaky vacuum lines, etc.

What does a scan with INPA / ISTA show?

hasanchaudhry · 09-06-2023, 07:10 PM

Quote:

Originally Posted by Hoody007

Could be any number of things. Mismatched injectors by themselves aren't the issue, but leaky injectors (those index 9s are pretty awful) definitely could be. Could also be bad coils, leaky vacuum lines, etc.

What does a scan with INPA / ISTA show?

there are only 2 codes

lamda 2
overboost

I have changed the vacuum lines and boost solenoids.

Hoody007 · 09-06-2023, 08:05 PM

I’d start with the O2 sensor and go from there, personally.
What codes exactly?

hasanchaudhry · 09-07-2023, 03:16 PM

Quote:

Originally Posted by Hoody007

I’d start with the O2 sensor and go from there, personally.
What codes exactly?

2C7F - lamda control 2
30FE - turbocharger, charge pressure too high
3100 - boost-pressure control, deactivation

I did replace the o2 sensors recently but the code still remains

09-04-2023, 02:50 AM	#1
hasanchaudhry Registered 0 Rep 3 Posts Drives: N54 e90 Join Date: Sep 2023 Location: canada iTrader: (0)	Injectors 2008 335xi mhd stage 1 91 octane Q. Can I run index 12 on cyl 1-3 and index 09 on cyl 4-6. Current situation: I just got this car. I checked and saw that there is a mix of index injectors on the car the ones on the vehicle currently are as follows cyl 1 index 09 cyl 2 index 12 cyl 3 index 02 cyl 4 index 12 cyl 5 index 02 cyl 6 index 09 My current issue is the car shakes on startup and when I accelerate the car is sluggish.
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09-04-2023, 02:11 PM	#2
AWD Addict Chief Executive 300 Rep 2,886 Posts Drives: 2008 335xi 6spd Coupe Join Date: Dec 2007 Location: Boston iTrader: (1) Garage List 2008 335xi [0.00]	Any fouled plugs? If you're running the same index in each bank (and they were properly coded) you are okay.
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09-04-2023, 06:54 PM	#3
Cloverdale Second Lieutenant 123 Rep 257 Posts Drives: 2007 335i Jb4 & perf. mods. Join Date: Aug 2018 Location: Cloverdale, BC, Canada. iTrader: (0)	Lot's of us are running different index's in the same bank with no issues.
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09-06-2023, 08:05 PM	#6
Hoody007 Major 1310 Rep 1,167 Posts Drives: 335i ZMZ LCI \| 850i/6 Join Date: Apr 2018 Location: Dunwoody, GA & Boston, MA iTrader: (0)	I’d start with the O2 sensor and go from there, personally. What codes exactly?
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