Emissions testing

TommyV9 · 03-23-2022, 10:21 AM

2008 E90 N54 - I sold this to my son a year ago and he's trying to get it emissions tested in Chicago. It has a JB4 tuner and a stage 1 MHD tune on it. I reinstalled the cats before I sold it to him. When the emissions station hooked up to the OBDII port the failure says: "Unable to communicate with vehicle's OBD system, commonly a damaged or corroded Data Link Connector(DLC) but could be indication of other problems with OBD..."

Is the JB4 interfering with the emissions testing? The MHD tune?

TIA
Tommy

CarAbuser · 03-23-2022, 11:08 AM

Yes, JB4 needs to be disabled. Probably easier to just remove it since you already have MHD stage 1 installed.

TommyV9 · 03-23-2022, 11:24 AM

The JB4 was on Map 1. I had him go to Map 0: JB4 disabled. He's never messed with it, that stuff doesn't interest him. He also doesn't have the expertise to remove the JB4. I appreciate the feedback.

Tommy

Saif2018 · 03-23-2022, 12:31 PM

Quote:

Originally Posted by TommyV9

The JB4 was on Map 1. I had him go to Map 0: JB4 disabled. He's never messed with it, that stuff doesn't interest him. He also doesn't have the expertise to remove the JB4. I appreciate the feedback.

Tommy

You'll have to remove it yourself or find someone to do it.

If I recall correctly, there's Youtube videos showing how to remove it.

TommyV9 · 03-23-2022, 02:09 PM

Quote:

Originally Posted by Saif2018

You'll have to remove it yourself or find someone to do it.

If I recall correctly, there's Youtube videos showing how to remove it.

Are you saying I have to remove it to disable it and pass emissions? Or that I have to do it since he cannot? I'm 350 miles away from the car, so me removing it is not an option.

Saif2018 · 03-23-2022, 06:17 PM

Quote:

Originally Posted by TommyV9

Are you saying I have to remove it to disable it and pass emissions? Or that I have to do it since he cannot? I'm 350 miles away from the car, so me removing it is not an option.

I'm saying if he cannot then you should or someone else should remove it.

He might be able to pass emissions with it in map 0, but if he has MHD stage 1 then the JB4 is redundant, using it only cause further headaches.

JB4 is designed to be used on its own or with backend MHD flashes, not stage 1 MHD tune, which does not require JB4 at all.

HardCoal99 · 03-24-2022, 05:01 PM

Jb4 on 0 should be good enough to pass inspection and allow the car to be scanned. I have a different back end flash that I must remove and replace with the stick flash before going in for inspection because the aftermarket flash prevents my car from achieving readiness.

You don't have to remove the JB4. It can stay on, but it needs to either be disabled or setup for a back end flash like you have.

How did you pass emissions before with the cats off? Some have a circuit installed to change the values and fool the car into thinking emissions are fine without the cats. If that's what you did, you may need to adjust that now that your cats are back on.

TommyV9 · 03-25-2022, 09:24 AM

No emissions testing or inspections here. He's in Chicago suburbs, so different story.

03-23-2022, 10:21 AM	#1
TommyV9 New Member 3 Rep 29 Posts Drives: 06 330i Join Date: Sep 2013 Location: Missouri iTrader: (0)	Emissions testing - JB4 and MHD Stage 1 2008 E90 N54 - I sold this to my son a year ago and he's trying to get it emissions tested in Chicago. It has a JB4 tuner and a stage 1 MHD tune on it. I reinstalled the cats before I sold it to him. When the emissions station hooked up to the OBDII port the failure says: "Unable to communicate with vehicle's OBD system, commonly a damaged or corroded Data Link Connector(DLC) but could be indication of other problems with OBD..." Is the JB4 interfering with the emissions testing? The MHD tune? TIA Tommy
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03-23-2022, 11:08 AM	#2
CarAbuser Lieutenant Colonel 475 Rep 1,544 Posts Drives: Z4 35i DCT / E92 335i DCT Join Date: Jul 2010 Location: United Kingdom iTrader: (0)	Yes, JB4 needs to be disabled. Probably easier to just remove it since you already have MHD stage 1 installed.
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03-23-2022, 11:24 AM	#3
TommyV9 New Member 3 Rep 29 Posts Drives: 06 330i Join Date: Sep 2013 Location: Missouri iTrader: (0)	Thanks The JB4 was on Map 1. I had him go to Map 0: JB4 disabled. He's never messed with it, that stuff doesn't interest him. He also doesn't have the expertise to remove the JB4. I appreciate the feedback. Tommy
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03-24-2022, 05:01 PM	#7
HardCoal99 Enlisted Member 3 Rep 31 Posts Drives: 2009 335xi Join Date: Feb 2013 Location: Allentown, PA iTrader: (0)	Jb4 on 0 should be good enough to pass inspection and allow the car to be scanned. I have a different back end flash that I must remove and replace with the stick flash before going in for inspection because the aftermarket flash prevents my car from achieving readiness. You don't have to remove the JB4. It can stay on, but it needs to either be disabled or setup for a back end flash like you have. How did you pass emissions before with the cats off? Some have a circuit installed to change the values and fool the car into thinking emissions are fine without the cats. If that's what you did, you may need to adjust that now that your cats are back on. __________________ 2009 335xi Le Mans Blue; JB4 - Map 5; flashed, VSRF DPs, VSRF Intercooler, transmission flash, VSRF chargepipe, LED interior, Angel Eyes, Glossy Black Grill, spolier, Rear Fog Light Mod, backup camera mod, 2020 Nav. Maps;
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03-25-2022, 09:24 AM	#8
TommyV9 New Member 3 Rep 29 Posts Drives: 06 330i Join Date: Sep 2013 Location: Missouri iTrader: (0)	I'm in rural Missouri No emissions testing or inspections here. He's in Chicago suburbs, so different story.
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