VEMS Community Forum
Technical => Triggering => Topic started by: black on July 04, 2017, 07:36:25 am
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I have a strange issue on a Audi I5 Turbo Setup. Car does one single missfire sometimes when boost comes up but most of the time its running fine. Car has to be hot to get the error.
VEMS is showing up trigger errors when the issue comes up.
Too many Pr. trig
Less Pr. trig
To many sec. trig
These errors occour also in every gearshift, but without any issues.
firmware 1.2.30
we did a triggerlog while cranking and it looks fine.
we did a triggerlog while running until the missfire comes up. In this triggerlog, there is no primary trigger at all. But how could the engine keep running without the primary signal?
cranking http://www.directupload.net/file/d/4772/otfgnxo5_jpg.htm (http://www.directupload.net/file/d/4772/otfgnxo5_jpg.htm)
cranking http://www.directupload.net/file/d/4772/dri2goig_jpg.htm (http://www.directupload.net/file/d/4772/dri2goig_jpg.htm)
running http://www.directupload.net/file/d/4772/one32cp3_jpg.htm (http://www.directupload.net/file/d/4772/one32cp3_jpg.htm)
issue http://www.directupload.net/file/d/4772/9dujlhxw_jpg.htm (http://www.directupload.net/file/d/4772/9dujlhxw_jpg.htm)
log http://www.directupload.net/file/d/4772/2fta3qj2_jpg.htm (http://www.directupload.net/file/d/4772/2fta3qj2_jpg.htm)
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I have a strange issue on a Audi I5 Turbo Setup. Car does one single missfire sometimes when boost comes up but most of the time its running fine. Car has to be hot to get the error.
VEMS is showing up trigger errors when the issue comes up.
Too many Pr. trig
Less Pr. trig
To many sec. trig
These errors occour also in every gearshift, but without any issues.
firmware 1.2.30
we did a triggerlog while cranking and it looks fine.
we did a triggerlog while running until the missfire comes up. In this triggerlog, there is no primary trigger at all. But how could the engine keep running without the primary signal?
cranking http://www.directupload.net/file/d/4772/otfgnxo5_jpg.htm (http://www.directupload.net/file/d/4772/otfgnxo5_jpg.htm)
cranking http://www.directupload.net/file/d/4772/dri2goig_jpg.htm (http://www.directupload.net/file/d/4772/dri2goig_jpg.htm)
running http://www.directupload.net/file/d/4772/one32cp3_jpg.htm (http://www.directupload.net/file/d/4772/one32cp3_jpg.htm)
issue http://www.directupload.net/file/d/4772/9dujlhxw_jpg.htm (http://www.directupload.net/file/d/4772/9dujlhxw_jpg.htm)
log http://www.directupload.net/file/d/4772/2fta3qj2_jpg.htm (http://www.directupload.net/file/d/4772/2fta3qj2_jpg.htm)
1. you have to understand that cam sync signal cant be in the missing gap or so near how it's in your case? that's the reason you are getting errors, you can try different trigger edge, maybe rising instead off falling, or make gap on cam wheel little bigger, that should solve the issue :)
2. trigger logging properly works on cranking, or idle max, if you want to log it on higher rpm you need to change your connection speed in ecu settings to something like 115200
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Thanks for reply - connecting speed was at the highest setting 115200.
I also suspected the gap. I will advice the owner again to correct that - I told him that before but he didn't
Changing from falling to rising made the engine no running at all.
Unfortunately I have no direct access to the car - makes things a little bit difficult - I know you know ;-)
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Thanks for reply - connecting speed was at the highest setting 115200.
I also suspected the gap. I will advice the owner again to correct that - I told him that before but he didn't
Changing from falling to rising made the engine no running at all.
Unfortunately I have no direct access to the car - makes things a little bit difficult - I know you know ;-)
so the best is just make gap on cam bigger, or if it has adjustable cam gear sometimes trigger wheel is adjustable :)
falling to rising made it even more into missing gap I believe :) anyway trigger log would say
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yes you are right, I told him to do so ;)
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So gap between first and second trigger has been adjusted. Engine is running smoother. Error seems to be gone. More test drive needed to ensure.
thanks KAMUTO :)
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maybe still to close? :o
(http://fs5.directupload.net/images/170713/tu4g2fxw.jpg) (http://www.directupload.net)
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should be fine
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should be fine
yes its fine now :)
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Unfortunately the error is back :o ::):
(http://fs5.directupload.net/images/170928/sujf8fck.jpg) (http://www.directupload.net)
(http://fs5.directupload.net/images/170928/6m8yg34x.jpg) (http://www.directupload.net)
(http://fs5.directupload.net/images/170928/vtv2lnyx.jpg) (http://www.directupload.net)
>:(
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where coils are grounded?
and btw, i can see some fucked up tooth in your log :D
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where coils are grounded?
and btw, i can see some fucked up tooth in your log :D
Unfortunately the car is far far away from me... I have to ask for. The ignition sytem is OEM as far as I know.
what exactly is fucked up? ;D
I dont get it ..
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Firmware 1.2.38, Cam Sensor replaced, still the same :o :P
(http://fs5.directupload.net/images/171017/fzkjw476.jpg) (http://www.directupload.net)
(http://fs1.directupload.net/images/171017/62wfc6m2.jpg) (http://www.directupload.net)
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timing belt slopiness or signal too close to gap
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I might have an issue similar. I got spikes on the secondary trigger signal. I solve it by a capacitance between signal and ground.
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I might have an issue similar. I got spikes on the secondary trigger signal. I solve it by a capacitance between signal and ground.
Ok, I heard about something like that from the NIRA users... what kind of capacity? 1 mikrofarad ??
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I do not remember what I have put, may be 0.1 uf, also I may have done a post about it, and a scope was a good friend.
I had a VR sensor (180Ohm) I did a computation to get the cut frequency 10 times the highest trigger freq.
The VR sensor is a nice thing because the highest the frequency the highest the level, hence the signal after the filter may remain high enough.
I might start from 1uF and then make smaller if necessary
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I do not remember what I have put, may be 0.1 uf, also I may have done a post about it, and a scope was a good friend.
I had a VR sensor (180Ohm) I did a computation to get the cut frequency 10 times the highest trigger freq.
The VR sensor is a nice thing because the highest the frequency the highest the level, hence the signal after the filter may remain high enough.
I might start from 1uF and then make smaller if necessary
VR sensor is a different story ;)
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I might have an issue similar. I got spikes on the secondary trigger signal. I solve it by a capacitance between signal and ground.
Ok, I heard about something like that from the NIRA users... what kind of capacity? 1 mikrofarad ??
i believe you are chasing ghosts...
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I might have an issue similar. I got spikes on the secondary trigger signal. I solve it by a capacitance between signal and ground.
Ok, I heard about something like that from the NIRA users... what kind of capacity? 1 mikrofarad ??
i believe you are chasing ghosts...
can't say but in fact the car was misfiring when trigger error occured (ok, not at shifting but sometimes it happend without shifting and then bang!
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Indeed the ghosts are here, invisible. Sometimes you scope them 8)
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I might have an issue similar. I got spikes on the secondary trigger signal. I solve it by a capacitance between signal and ground.
Ok, I heard about something like that from the NIRA users... what kind of capacity? 1 mikrofarad ??
i believe you are chasing ghosts...
can't say but in fact the car was misfiring when trigger error occured (ok, not at shifting but sometimes it happend without shifting and then bang!
so it would be time to change spark plugs :))
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I might have an issue similar. I got spikes on the secondary trigger signal. I solve it by a capacitance between signal and ground.
Ok, I heard about something like that from the NIRA users... what kind of capacity? 1 mikrofarad ??
i believe you are chasing ghosts...
can't say but in fact the car was misfiring when trigger error occured (ok, not at shifting but sometimes it happend without shifting and then bang!
so it would be time to change spark plugs :))
yes... because worn sparkplugs tend to missfire exact at 5500 rpm every time ;D - but for sure, spark plugs were the first part changed to new ;-)
but maybe you can tell me what you meant with "fucked up trigger tooth" ?? ;)
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I might have an issue similar. I got spikes on the secondary trigger signal. I solve it by a capacitance between signal and ground.
Ok, I heard about something like that from the NIRA users... what kind of capacity? 1 mikrofarad ??
i believe you are chasing ghosts...
can't say but in fact the car was misfiring when trigger error occured (ok, not at shifting but sometimes it happend without shifting and then bang!
so it would be time to change spark plugs :))
yes... because worn sparkplugs tend to missfire exact at 5500 rpm every time ;D - but for sure, spark plugs were the first part changed to new ;-)
but maybe you can tell me what you meant with "fucked up trigger tooth" ?? ;)
how far your sec trigger is from missing tooth?
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Unfortunately the error is back :o ::):
(http://fs5.directupload.net/images/170928/vtv2lnyx.jpg) (http://www.directupload.net)
>:(
and btw, i can see some fucked up tooth in your log :D