Hey,
I started driving my E30 today. It's a M20, with the VR sensor, GM coils running wasted spark Firmware is 1.1.95. While I was cruising on the highway, I got Less Pr.Trig errors under load. The VEMSdisplay started freezing and restarting whenever it happened. I was wondering if anyone had any ideas as to why this happens? I have a log of when it occurs. But am not sure how to attach it.
Thanks,
Sam
Hello SamE30,
To get some idea of what is going on (most likely ignition noise superimposed on GND or VR signal) please provide a triggerlog of engine cranking without IGN and INJ fuse for 8-10 seconds, please make a sharing report from VemsTune and provide link to this here, you can also attach your other vemslog there.
Best regards, Dave
Perfect, I will do this today at lunch.
I also wanted to note that it only starts doing it after driving for a while. And when it starts doing it, it progressivly gets worse. I also noticed it only started happening when I wired my tachometer to the stepper output, I don't know if it's a coincidence or not.
Quote from: SamE30 on April 22, 2015, 12:48:30 PM
Perfect, I will do this today at lunch.
I also wanted to note that it only starts doing it after driving for a while. And when it starts doing it, it progressivly gets worse. I also noticed it only started happening when I wired my tachometer to the stepper output, I don't know if it's a coincidence or not.
98% one of ign coil is bad.
I was speaking with Sascha and he looked over a log and my config. I had the VR trigger set to falling instead of rising. I'm going to see if this fixes it tonight. In the mean time I'll get a trigger log and post it up tonight.
Filtering shouldn't be enabled with VR multi tooth correct?
I think this worked.
http://vems.hu/vemstune/sharingcenter/reports.php?cmd=view&key=RmOmnd
Hi Sam,
Quote from: SamE30 on April 23, 2015, 12:31:00 AM
http://vems.hu/vemstune/sharingcenter/reports.php?cmd=view&key=RmOmnd
Your report does not contain triggerlog or vemslog, could you attach these to your current sharing report ?
Best regards, Dave
I attached a trigger log when cold. I also attached a vemslog of when it happens, it progressively gets worse and worse once it starts happening. It seems to be after about 15 minutes of driving.
The only thing I did recently is connect the Tach to the stepper output like I had mentioned before.
Correcting from falling to rising didn't change the issue either.
Hello Sam,
Reviewed your triggerlog, no anomalies there; Most likely cause ignition noise, check your coilpack, ignition cables and sparkplugs for any HV leaks to GND.
Best regards, Dave
Will do. I will update with my findings.
Thanks again.
I have checked for shorts to ground within the HC leads, and plugs with no luck. I purchased a new ignition coil and systematically swapped it whenever the trigger error occured and it came back fairly quickly.
I'm running 3 GM 2 tower coils. I've heard from the MS guys that they are prone to lots of ignition noise causing resets. Have you heard of this?
Whenever the error occurs the whole VEMS resets and goes into afterstart mode.
Quote from: SamE30 on April 24, 2015, 01:39:26 AM
I have checked for shorts to ground within the HC leads, and plugs with no luck. I purchased a new ignition coil and systematically swapped it whenever the trigger error occured and it came back fairly quickly.
I'm running 3 GM 2 tower coils. I've heard from the MS guys that they are prone to lots of ignition noise causing resets. Have you heard of this?
Whenever the error occurs the whole VEMS resets and goes into afterstart mode.
i know some guys are putting capacitor between ignition coil + and - to suppres noise :)
Can you elaborate? Is this only with GM coils?
I changed the coils and plug wires. Still nothing.
I did a trigger log of the issue while it occurs.
http://vems.hu/vemstune/sharingcenter/reports.php?cmd=view&key=RmOmnd
something is totally wrong with your setup
Quote from: Kamuto on April 25, 2015, 11:00:56 PM
something is totally wrong with your setup
Oh, thanks.
I replaced the Flyback diode, and the crank sensor. Now when the issue occurs the car dies and won't restart until it stils for a bit. It loses crank signal completely. I noticed if I unplug and plug the crank sensor in it will restart. I followed that and I have a feeling there is a break in the harness somewhere, which is odd because it's a brand new V3Twin harness. I'm going to rewire it and try again.
Is it possible that once the ecu gets warm the injector/ignition drivers are failing? I can get new FETS locally but I don't know if I trust myself to install them.
The MCP chip failed, it will not read 5v input. Where can I get the rescue kit, it is not listed on the website.
Hello SamE30,
From your description it seems likely there is some wiring issue or bad contact somewhere, a FET or IGBT problem seems less likely. As a quick test try and rule that out a rewire is a very good idea; but make sure you use a shielded cable.
MCP chip is not in the rescue kit, exactly when and how did it fail ? If 12v was applied to one of the inputs this might be related to your trigger problem, it can cause additional damage to the ecu.
Best regards, Dave
I'm fairly certain the EGT sensor sheild made contact with the +12v battery post on my car. I have wires 5v with a 4.7k ohm resistor to the Analog inputs and there is no reading in the RAW ADC data. One of the inputs is reading 120v. The WB02 sensor is also taking a long time to start reading.
I will rewire the sensor (It is shielded, I'm using the Shielded wires in the V3 twin harness).
I will update tonight.
No crank signal at all now after I re-wired it. It's wired correctly.
I need to send this ECU out for testing/repair. Anyone?
To update this.
The primary trigger circuit was damaged somewhere along it's life. I ended up purchasing a brand new unit, and all is well.