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10-10-2018, 11:15 PM | #1 |
Alphanumeric
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 340i
Posts: 9,585
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Inspection woes
Car is 2011 535i 6-speed manual (4/11 build) running MHD Stage 1. Only other mod is M-performance exhaust.
I flashed MHD stage 1 93 OTS, with mild burbles and cold start delete in May 2018. I reflashed in June to regain cold start (despite the noise it makes with my exhaust), as I found it easy to stall the manual transmission car on a cold start without the extra revs that stock provides. I've generally been very happy with the tune. Normal and Sport mode still affect throttle as usual. The car feels faster with smooth power delivery. I have commented on f10 forums as much and given them props for what seems to be a quality tune. I never looked at logs, I never got a CEL. Today the car failed NJ state inspection. It seems some codes/parameters are not ready. I have found out about the rightly feared "drive cycle". Before I get to the drive cycle, I think I need to make a choice in the MHD app: 1. Flash to Stage 0 (MHD remains installed, stock power) 2. Flash to stock (remove MHD) I'm guessing 2. is safer to retest with but also requires more time with flashing and reflashing. I just flashed to Stage 0. As a bonus, the MHD app shows which codes are incomplete. And now for the magic drive cycle... 2min15sec cold idle, then gentle accelerate to 20 to 30mph range, stay there for 3min15sec (presumably on the right lane with hazards on, because you need to be able to go that speed continuously for 1.5mi or so), then accelerate gently to the 40 to 60mph range and stay there for 15min. Decelerate and after stopping idle for 5 minutes. If you ever fluctuate throttle wildly (whatever that means), go above 3000rpm or 60mph, the cycle is toast and you have to start from a cold car again. Gotta love how I'll have to roll merges and stop signs, but then be dangerously slow just to get these stupid codes to ready. Why not risk yourself and others in traffic to collect emissions data? I get it that the tune got me into this, but once you start searching drive cycle you see all sorts of causes for the "drive cycle" from dead batteries, to replaced sensors... Pretty much the same recipe for all 96+ bmw's, just the number of exceptions/incompletes may vary by state and by model year. |
10-10-2018, 11:21 PM | #2 |
Alphanumeric
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 340i
Posts: 9,585
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Said procedure:
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10-10-2018, 11:22 PM | #3 |
195
Join Date: Oct 2003
Posts: 24,622
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JFC, I just looked up "drive cycle" and that's nuts. They can't just use a sniffer instead, like they used to do?
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10-11-2018, 10:04 AM | #4 | |
Chief title editor
Join Date: Oct 2003
Posts: 26,599
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I posted about the Jaguar's drive cycle a couple years ago. Your response was "wtf?" and Bren dittoed.
http://forums.carmudgeons.com/showpo...&postcount=107 Quote:
__________________
OH NOES!!!!!1 MY CAR HAS T3H UND3R5T33R5555!!!!!!1oneone!!!!11 Team WTF?! What are you gonna do? |
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10-11-2018, 08:45 PM | #5 |
There and back again
Join Date: Oct 2003
Carmudgeonly Ride: 2003 BMW 325xiT; looking for a new fun car
Location: New York
Posts: 2,939
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NJ no longer performs (or even has) testing for anything other than OBDII ready / fail status. Pre-OBDII cars no longer need to be inspected. You can have a broken windshield, no headlights or muffler, and steering pulling violently to one side and you'll pass in NJ as long as your OBDII status is good. Oh, and inspection is free at state-run facilities.
I'm just amazed that nobody has come up with a Raspberry Pi / Arduino / etc. OBDII emulator that just goes "Nope, nothing to see here. Move along!" to pass inspection. |
10-10-2018, 11:37 PM | #6 |
Mugwump
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, Chevy Colorado, Tesla Model 3
Location: NY
Posts: 17,475
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A) Ugh.
B) I'm confused. What does doing this drive cycle accomplish? It logs all the correct information to get past an ECU check? |
10-11-2018, 06:54 AM | #7 | |
Relic
Join Date: Oct 2003
Location: Bethesda, MD
Posts: 12,466
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Quote:
I hope that equ has a code reader and is using it to check the monitors.
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2011 M3 2006 Sierra 2500HD 4WD LBZ/Allison 2004 X5 3.0i 6MT 1995 M3 S50B32 1990 325is 1989 M3 S54B32 Hers: 1989 325iX 1996 911 Turbo |
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10-11-2018, 06:52 AM | #8 |
Relic
Join Date: Oct 2003
Location: Bethesda, MD
Posts: 12,466
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You do not have to restart the cycle from scratch, FYI. You just need to complete all of the components.
Normally, the drive cycle is completed in normal driving - however, some people don’t.
__________________
2011 M3 2006 Sierra 2500HD 4WD LBZ/Allison 2004 X5 3.0i 6MT 1995 M3 S50B32 1990 325is 1989 M3 S54B32 Hers: 1989 325iX 1996 911 Turbo |
10-11-2018, 07:29 AM | #9 |
No more BMWs
Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
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Nick beat me to it. Get a scan tool that can scan the readiness flags. The drive cycle is just ... driving the vehicle normally. Some of the better scan tools will let you monitor the readiness flags as you drive.
There should be no surprise that an aftermarket flash may screw with emissions readiness. BMW has been tougher to get around emissions readiness than most other makes since at least the E46 generation. |
10-11-2018, 08:37 AM | #10 |
Alphanumeric
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 340i
Posts: 9,585
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So while I had the hood up yesterday a neighbor came by and inquired. In a few minutes, I had a obdii scanner to borrow, a very basic one. I could see 3-4 codes as incomplete. After I was done with flashing to Stage 0 (but not removing MHD completely), I saw that MHD flashing app itself allows me to see the codes... So yeah, it'll be good to know that it is "ready" before I go and fail again. I hope the drive cycle is as normal as you make it to be; there are stories on the forums about people just not being able to get to the "ready" state.
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