help with VEMS cold start

Discuss VEMS and other standalone ECUs

help with VEMS cold start

Postby yada-yada-yada » Sun Dec 30, 2018 5:31 pm

about 3 out of five days when trying to start in the morning to go to work i crank the engine over and it won't start and it will backfire out the exhaust when i turn the key off. I crank again usually two more times then it fires normally, it will never back fire more than once though. Vemstune is showing trigger error "too many sec trigger", this goes away after about 20 seconds of running and doesn't happen when warm. This problem seems to get worse in colder months. where should i be looking? Cam sensor, grounds? attached trigger log and starting log
Attachments
v3.3_u007060-2018.10.22-04.42.32.vemslog
(1.98 MiB) Downloaded 122 times
v3.3_u007060-2017-12-27-04.29.47.triggerlog
(31.5 KiB) Downloaded 122 times
93 URS4 317,000 miles 6 speed O1E swapped
VEMS PnP from EFI express, 7a head, arp headstuds, 630cc inj., holset hx35 hybrid with k26 hotside, GM D585 ign coils, STR log manifold, 7a cams, adjustable billet timing gear,
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yada-yada-yada
 
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Re: help with VEMS cold start

Postby morris400 » Sun Dec 30, 2018 9:30 pm

I ran into this problem during my initial start ups. My crank enrichment was to low. I'll have a look at your log and see how the numbers look compared to mine. I went from 3 starts before it would stay running to 1 start now.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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morris400
 
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Re: help with VEMS cold start

Postby morris400 » Sun Dec 30, 2018 9:44 pm

your crank enrichment seems low to me. i had to have mine at 500% @ -30 and 375% at 0c to get mine to start on 1 start. i have a thread right below yours that may be worth a look. Chris has been an amazing help for me during the tuning process.
2016 VW Jetta 1.4T Daily Driver Stock.
1994 UrS4 - K24 7400 EFI Express tuned
2001 B5 S4 Stg 3- ( gone! Dropped valve cyl 4)

IF YOU CANT STAND BEHIND OUR TROOPS...FEEL FREE TO STAND IN FRONT OF THEM!
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Posts: 264
Joined: May 10, 2013
Location: Alberta, Canada


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