Serious VEMS Trigger Issues

Discuss VEMS and other standalone ECUs

Serious VEMS Trigger Issues

Postby vt10vt » Sat Jan 23, 2016 4:10 pm

So quick back story. A couple weeks ago the car started doing this thing where it would die during warmup. I never logged it ( :bangshead: ) or really worried about it as it's been too cold and I've been too busy. Then a few days ago it started getting harder to start in the mornings, requiring a couple key cycles. Then yesterday it barely started and ran on 1 or 2 cylinders for a minute, died, restarted same way, required foot to keep it running, and then started running on all cylinders after a few minutes. Today it won't start. At all. I tried disabling the cam sensor in VEMS and taking the 50/50 shot at it starting, no dice after plenty of tries. Cam sensor seemed to be bad, I replaced it, new one seems to test out fine, nice 0-4.9v swing but still no start.

Attached is a trigger log, PLEASE HELP I'm about out of ideas and really don't know where to go from here in terms of diagnostics. The crank signal looks normal but I don't understand why I'm getting a.) 2x cam sync pulses and b.) I'm getting so many secondary trigger errors. Any help would be appreciated!

Config and other trigger logs attached in following posts.
Attachments
v3.3_u009942-2016-01-23-15.50.17.triggerlog
(4 KiB) Downloaded 124 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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Re: Serious VEMS Trigger Issues

Postby vt10vt » Sat Jan 23, 2016 4:11 pm

Config
Attachments
v3.3_u009942-A-2016.01.23-16.11.16.vemscfg
(13.28 KiB) Downloaded 124 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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Re: Serious VEMS Trigger Issues

Postby vt10vt » Sat Jan 23, 2016 4:11 pm

Trigger log with cam sensor disabled
Attachments
v3.3_u009942-2016-01-23-15.58.25.triggerlog
(4 KiB) Downloaded 121 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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Re: Serious VEMS Trigger Issues

Postby vt10vt » Sat Jan 23, 2016 5:50 pm

Should have mentioned: 1.8T w/ OEM 60-2 on the crank and AEB single window cam wheel (1 window). Econoseal VEMS wired into factory harness, COP w/ R8 coils.
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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Re: Serious VEMS Trigger Issues

Postby themagellan » Sun Jan 24, 2016 3:18 am

Free bump.

It's been cold as stück around us and I can only imagine e VT. If you've been driving through slush or weather has been brutal why not check your harness or wiring that controls the coils/injectors if you didn't touch anything then something touched itself
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Re: Serious VEMS Trigger Issues

Postby chaloux » Sun Jan 24, 2016 8:24 am

This is a shot in the dark, try enabling hall dirac filtering in secondary trigger settings. I had major issues with the 4k a few iterations back and enabling this made all my starting problems go away... Might help.

But I think it was because I had grounding issues to the ECU.
Matt

01 Allroad 6speed - RS4 clutch, catless downpipes, stuklr tune
04 Jetta TDI - DC stage I clutch/14lb fw
DEATH by rust - 96 Audi A6 Avant 2.5l TDI
GONE :( 87 4ktq - 4 FOX SNAKES
DEAD :( - 1996 S6 mit TDI
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Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 8:47 am

Thanks guys!!

Mage, I've cleaned all my connections and checked grounds etc, I have power everywhere, seems like a trigger issue to me. And yeah I'm done with winter!

Matt, I've tried it with the filler, didn't seem to make any difference but I'll give it another shot. As soon as the car gets any amount of heat in it, the problem goes away. I've checked/verified my grounds.

Please keep the suggestions rolling it'd be great not to have to ride the bus in tomorrow!
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby Marc » Sun Jan 24, 2016 12:25 pm

I remember when you were up your battery was shot. have you replaced it? winter means slow cranking as it is. with a shit battery? probably enough to make a no start situation.
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Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 12:27 pm

Marc wrote:I remember when you were up your battery was shot. have you replaced it? winter means slow cranking as it is. with a shit battery? probably enough to make a no start situation.

Nope fresh battery and I'm keeping it on a charger while I work and it cranks plenty fast.
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 12:36 pm

What I really don't understand is why I can't get it started without the cam sync. By all accounts that trigger log looks perfect to me :nuts:
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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vt10vt
 
Posts: 946
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Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 12:38 pm

Trigger log with Hall Direc filtering enabled.
Attachments
v3.3_u009942-2016-01-24-12.37.36.triggerlog
(5 KiB) Downloaded 120 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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vt10vt
 
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Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby Marc » Sun Jan 24, 2016 12:58 pm

you're getting two pulses on the secondary, not sure why but its easy to filter.

on the secondary trigger page, set ignore sectrig pulses above = 20.

if you really want wasted spark to work properly, you have to set dual output mode on the ignition outputs and set the channels to the cylinders that are 180 out, and disable the secondary trigger.
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Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 1:12 pm

I don't want to run wasted spark, just trying to diagnose things :)

Fresh set of plugs got it running without the cam sync, tried filtering like you said Marc and although the trigger log (attached) seems okay I still get no start.
Attachments
v3.3_u009942-2016-01-24-13.11.53.triggerlog
(4 KiB) Downloaded 113 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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vt10vt
 
Posts: 946
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Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 1:14 pm

Wait, take that back, just started immediately with those same settings... maybe I forgot to cycle the key? I feel like I'm going :nuts:
Attachments
v3.3_u009942-2016-01-24-13.14.32.triggerlog
(11 KiB) Downloaded 112 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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vt10vt
 
Posts: 946
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Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 1:22 pm

Still getting "Less Second Trig" on the main display
Attachments
v3.3_u009942-2016-01-24-13.21.27.triggerlog
(13.5 KiB) Downloaded 118 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
User avatar
vt10vt
 
Posts: 946
Joined: Mar 10, 2013
Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 1:23 pm

Super quick log of how it's idling now
Attachments
v3.3_u009942-2016.01.24-13.23.25.vemslog
(12.5 KiB) Downloaded 121 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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vt10vt
 
Posts: 946
Joined: Mar 10, 2013
Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby Marc » Sun Jan 24, 2016 1:55 pm

your primary is going haywire with the engine running which usually means noise. check your plugs, coils, and grounds.
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Proprietor, EFI Express

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Re: Serious VEMS Trigger Issues

Postby chaloux » Sun Jan 24, 2016 2:23 pm

Running resistor plugs or no? Running non-resistor plugs in my 4k would make it shut down after a pull as soon as I lifted off throttle. Put resistor plugs back in and no problems.
Matt

01 Allroad 6speed - RS4 clutch, catless downpipes, stuklr tune
04 Jetta TDI - DC stage I clutch/14lb fw
DEATH by rust - 96 Audi A6 Avant 2.5l TDI
GONE :( 87 4ktq - 4 FOX SNAKES
DEAD :( - 1996 S6 mit TDI
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Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 2:58 pm

Running NGK 4554, but I do have questionable coils, I bet that's the problem. It does the same exact thing with two different crank sensors and I feel pretty good about my ground arrangement. It's a non-issue after it gets some heat in it so I bet it's something with the coil's insulation or something that is susceptible to the cold. I guess I'll be ordering a set of new coils tomorrow, I have piles of used ones but so many of them exhibit weird issues I should definitely just do all four to eliminate that as a possibility :shame:
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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vt10vt
 
Posts: 946
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Location: Winooski, VT

Re: Serious VEMS Trigger Issues

Postby vt10vt » Sun Jan 24, 2016 3:09 pm

Is this my primary trigger going away completely or am I interpreting this wrong?
Attachments
v3.3_u009942-2016-01-24-15.07.39.triggerlog
(14 KiB) Downloaded 119 times
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
User avatar
vt10vt
 
Posts: 946
Joined: Mar 10, 2013
Location: Winooski, VT


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