[wahooooman]

Hello all been having an issue with my M235 stalling when i first start the car and after a long sprinted drive. Also i have a-lot of gurgles and pops when in comfort mode (this only used to happen in sport). Terry suggested that i may have a 02 sensor problem, not knowing how flashing the cat readiness affects the 02 sensors is one of my questions. (mods and codes Below logs also linked) Thought it was a fuel rail issue so sensor was replaced as well.

Jb4 EWG connector
Enzo Tune
Catless DP
Chargpipe
Hd intercooler
Intake
NGK 97506 2 step colder plugs gapped to 0.018
Cold Start codded out
Readiness codded

Codes:
102001
119002
101F01

And

102001
101F01
121530
120408

Logs: Map 5 https://datazap.me/u/wahooooman/map2...log=0&data=1-4

Map 2 : https://datazap.me/u/wahooooman/map2...ata=1-4&mark=1


Any clarification or help would br greatly appreciated Thanks

[M235SDCA]

I'm running BM3 OTS tune with the cold start delete and haven't had any stalling problems , although it runs like crap when it is cold out for about 30 seconds. That should affect the O2 sensors.

Also curious why you are running a JB4 on top of the Enzo tune? Is this an older Enzo tune? Enzo supports BM3 now. With your map 2 log it doesn't look like the JB4 is adding anything. Your map 5 log does have higher targets but you are not hitting them. Note that with the latest JB4 firmware you have to set the duty bias to 50 or you will underboost on absolute maps per the instructions on N54 tech.

Do you have the issues running map 0 or with the JB4 disconnected completely?

[wahooooman]

Originally Posted by M235SDCA

I'm running BM3 OTS tune with the cold start delete and haven't had any stalling problems , although it runs like crap when it is cold out for about 30 seconds. That should affect the O2 sensors.

Also curious why you are running a JB4 on top of the Enzo tune? Is this an older Enzo tune? Enzo supports BM3 now. With your map 2 log it doesn't look like the JB4 is adding anything. Your map 5 log does have higher targets but you are not hitting them. Note that with the latest JB4 firmware you have to set the duty bias to 50 or you will underboost on absolute maps per the instructions on N54 tech.

Do you have the issues running map 0 or with the JB4 disconnected completely?

Thank you for the response, to be honest i am using the Jb4 just to read codes, log and have the displays as i had it before i went to Enzo. He flashed the car recently so it shouldn't be an older tune.

So far I have the issue with Jb4 on map 0, I will uninstall today and see if I have any issues, but sometimes I need to drive it for a day or two before it happens. what does happen every-time though is the struggle to start and a little RPM fluctuation on idle.

I guess my question is i know what the 02 sensors do but does the flash do anything to the normal operating procedure. If i had a bad 02 the car would run like crap even with the flash as it is still looking at mixtures ? sorry bit of a newb with this flash business.

Thanks for your help !

[M235SDCA]

Originally Posted by wahooooman

Thank you for the response, to be honest i am using the Jb4 just to read codes, log and have the displays as i had it before i went to Enzo. He flashed the car recently so it shouldn't be an older tune.

So far I have the issue with Jb4 on map 0, I will uninstall today and see if I have any issues, but sometimes I need to drive it for a day or two before it happens. what does happen every-time though is the struggle to start and a little RPM fluctuation on idle.

I guess my question is i know what the 02 sensors do but does the flash do anything to the normal operating procedure. If i had a bad 02 the car would run like crap even with the flash as it is still looking at mixtures ? sorry bit of a newb with this flash business.

Thanks for your help !

If you are having intermittent drivetrain fault problems check for loose connections. I had this a while back where it would show up quite a bit and then go away. Every now rarely I get one still on startup, but just turn off and restart. Seems a very occasional fault is just something that happens on occasion with the JB4.

If the idle problem remains, you might check with Enzo. It could be he has to adjust something in the idle tables. At any rate it shouldn't be stalling unless you have cold start delete and it is actually very cold. As for the codes are any of these sensor codes? Your AFR values looked OK and I would think these would be messed up if the sensor is bad.

[wahooooman]

Originally Posted by M235SDCA

If you are having intermittent drivetrain fault problems check for loose connections. I had this a while back where it would show up quite a bit and then go away. Every now rarely I get one still on startup, but just turn off and restart. Seems a very occasional fault is just something that happens on occasion with the JB4.

If the idle problem remains, you might check with Enzo. It could be he has to adjust something in the idle tables. At any rate it shouldn't be stalling unless you have cold start delete and it is actually very cold. As for the codes are any of these sensor codes? Your AFR values looked OK and I would think these would be messed up if the sensor is bad.

Thanks for all your help so far! my duty bias was not set to 50, so i changed it and so far no issues (not sure if this would contribute to the drivetrain malfunction). I will drive it around a bunch and see if its gone for good.

[bryan_G01]

did you have under 1/4 tank of gas and get on it?

This will throw a CEL drivetrain every time for me on track.

[pikcachu]

Originally Posted by bryan_f22

did you have under 1/4 tank of gas and get on it?

This will throw a CEL drivetrain every time for me on track.

What code do you get when you get the CEL ?

[bryan_G01]

no fault code, and it goes away on restart.

[wahooooman]

Originally Posted by bryan_f22

did you have under 1/4 tank of gas and get on it?

This will throw a CEL drivetrain every time for me on track.

So I have been filling my car full since I read a post about this a while ago, I can say though if I have less than 1/4 and go over bumps I do get the same issue.

[chemh0ser]

I have been experiencing the same issue although I have no tunes or chips installed. it only happens when it is hot outside >85 degrees. The warnings have intermittently been: Lighting System malfunction, Cruise control malfunction, Drivetrain malfunction, and Chassis malfunction. Only the last 2 have caused the stalling.

[R3LMV]

Originally Posted by M235SDCA

If you are having intermittent drivetrain fault problems check for loose connections. I had this a while back where it would show up quite a bit and then go away. Every now rarely I get one still on startup, but just turn off and restart. Seems a very occasional fault is just something that happens on occasion with the JB4.

If the idle problem remains, you might check with Enzo. It could be he has to adjust something in the idle tables. At any rate it shouldn't be stalling unless you have cold start delete and it is actually very cold. As for the codes are any of these sensor codes? Your AFR values looked OK and I would think these would be messed up if the sensor is bad.

I've just had my JB4 installed on my M235, drove 50 miles fine and now I keep have the drivetrain malfunction issue, have you got round the issue completely now. Have you got a picture of your settings in map 2 please?

[M235SDCA]

Originally Posted by R3LMV

I've just had my JB4 installed on my M235, drove 50 miles fine and now I keep have the drivetrain malfunction issue, have you got round the issue completely now. Have you got a picture of your settings in map 2 please?

I've been using map 6. Here are the settings from the last time I saved them. Am on a business trip now so not connected to the car and WMI settings are wrong.

[beMtroubleYou]

how is your idle and do you smell gasoline on idle? Gas not exaust.

Might aswell just add this to anyone reading. Had the same issue. Car stuttered occasionally and hesitated on cold starts. Once it almost didnt fire up and the light up the DM. After restart it disappeared.

Did a couple WOT nothing strange, car pulls hard. Read codes. Nothing.

Then I started to notice hard idle and gas smell on idle. Took it to dealer. Valvetronic harness change. Then all codes appeared and pointed to valvetronic servo motor. After they changed that car didnt send codes but new vaules couldnt be coded into the valvetronic ECU(or ecu in valvetronic section). Then they changed the eccentric cam. And now car took in the new values, idles perfect and no stalling.

Point is, there could be hard malfunction that cant be read by codes / not saying this is your case. Just a heads up.

[wahooooman]

Originally Posted by beMtroubleYou

how is your idle and do you smell gasoline on idle? Gas not exaust.

Might aswell just add this to anyone reading. Had the same issue. Car stuttered occasionally and hesitated on cold starts. Once it almost didnt fire up and the light up the DM. After restart it disappeared.

Did a couple WOT nothing strange, car pulls hard. Read codes. Nothing.

Then I started to notice hard idle and gas smell on idle. Took it to dealer. Valvetronic harness change. Then all codes appeared and pointed to valvetronic servo motor. After they changed that car didnt send codes but new vaules couldnt be coded into the valvetronic ECU(or ecu in valvetronic section). Then they changed the eccentric cam. And now car took in the new values, idles perfect and no stalling.


Point is, there could be hard malfunction that cant be read by codes / not saying this is your case. Just a heads up.

Thanks for the heads up! I really hope this is not the issue, ill have to check to see if i smell gas... all i can really smell is not having Cats.
For some reason the malfunction stopped once Duty Bias was changed. No more Malfunction no more hard start/Stalling.

[R3LMV]

Originally Posted by wahooooman

Thanks for the heads up! I really hope this is not the issue, ill have to check to see if i smell gas... all i can really smell is not having Cats.
For some reason the malfunction stopped once Duty Bias was changed. No more Malfunction no more hard start/Stalling.

What did you set your duty bias to?

[wahooooman]

Originally Posted by R3LMV

What did you set your duty bias to?

I set My duty Bias to 50 and i seem to be hitting boost targets now!