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      07-08-2013, 05:54 PM   #1
sbrauns
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Why is my PWM going to zero?!?

Can anybody help me with the following problem.
My DME seems sometimes to decide to set the PWM output to zero with an ton of lag and a noisy exhaust as result. It is not doing this all the time.

I finally was able to capture it in a log. This log was done wile cruising at a constant speed when suddenly the PWM drops to zero. I have a JB4 g5 iso installed with latest firmware. But it does it on all firmware versions. I am also pretty sure its the DME doing it and not the JB4.
Any help would be appreciated
Thanks!
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      07-08-2013, 07:42 PM   #2
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MSD81? Is the meth aquamist based?
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      07-09-2013, 05:11 AM   #3
sbrauns
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Yes it is a MSD81. But no meth or aquamist.
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      07-09-2013, 07:56 AM   #4
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Ohhh the JB PWM for wastegates? Sry my knowledge of JB4 is pretty modest, when I hear PWM its always in the context of methanol. Is there a repeatable scenario that causes this?
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      07-09-2013, 09:42 AM   #5
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It is random. But there is a point on my way home where I often see it.
There is a little climb in the road where it often starts. You can see it in the log that the throttle is climbing and boost rises a little bit. Right at that point it drops the pwm to zero.
I am pretty sure that it is not the JB4 doing this but the DME it self. The JB4 listens to the the DME. When it drops its duty cycle to zero the jb4 drops its pwm to zero. (This is what the tuner told me) it also shows in the logs.
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      07-09-2013, 12:03 PM   #6
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That all sounds reasonable but id pull JB4 and see if you can still produce the fault. Its odd that the WGDC would suddenly plummet like that.
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      07-10-2013, 06:39 PM   #7
sbrauns
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I have not heard of anybody else experiencing this! Am I the only one? My DME has never been updated. Could it be that this issue is resolved if I update my DME?
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      07-10-2013, 09:33 PM   #8
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If you have the ability to do so it probably cant hurt.
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      07-11-2013, 03:59 AM   #9
sbrauns
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So I understand you have never seen this 135Pats?
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      07-11-2013, 09:53 AM   #10
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Quote:
Originally Posted by sbrauns View Post
So I understand you have never seen this 135Pats?
Ive seen a few logs with funky WG issues, but they were easily resolved and werent related to the actual DME. I have never seen the car's DME suddenly react like that under otherwise "normal" circumstances.

Is the car driveable enough to pull a log?
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      07-11-2013, 06:40 PM   #11
sbrauns
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Besides this issue, the car drives great. Even when the issue occurs and step on the gas it builds up boost as normal. Just with a little lag.
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      09-22-2018, 07:14 PM   #12
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Thread revival time!

Either my searching skill is lacking, or this is still an uncommon issue. This is the first thread that I have come across that matches my issue almost identically. I was not fortunate enough to catch it on a log, however.

Mine has gone from very similar, on slight uphill incline, etc - to now leaving the WG at 0.

OP, did you ever find the problem and/or fix?
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      09-23-2018, 06:17 AM   #13
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Look at vacuum lines and replace boost solenoid?
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      09-29-2018, 03:35 PM   #14
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It's a thing called CILC (cylinder individual lambda control) adaptation.

You can find more informations online about this.

It happens to me time to time aswell, especially after low cruise, or low cruise in climbs, and yes it had tons of lag, exhaust louder with more pops&bangs
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      10-19-2018, 06:50 PM   #15
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Quote:
Originally Posted by studio54 View Post
It's a thing called CILC (cylinder individual lambda control) adaptation.

You can find more informations online about this.

It happens to me time to time aswell, especially after low cruise, or low cruise in climbs, and yes it had tons of lag, exhaust louder with more pops&bangs
Are you tuned or stock?
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      10-24-2018, 06:43 AM   #16
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Quote:
Originally Posted by E30 Racer View Post
Are you tuned or stock?
I have been tuned since day 1 with a custom map, but i can relate first times it has happen to me was with MHD, espcially with stage 2+ map.

Anyway, when it happens, you just have to WOT again and then it goes away.

But during the CILC, i had a live WGDC bank gauge with MHD logging, and they really go to 0.
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