87 951 VEMS Install
02-26-2023, 02:34 PM
#736
3rd Gear
Join Date: Nov 2020
Posts: 3
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Thanks Chris,
I was able to solve the issue yesterday after Peep sent me instructions on how to upload the firmware again. Apparently I messed something during initial installation/setup. Now I working on learning how to modify configurations etc. as the car is good at idle but cuts when I try to accelerate.
Regards,
Rey
I was able to solve the issue yesterday after Peep sent me instructions on how to upload the firmware again. Apparently I messed something during initial installation/setup. Now I working on learning how to modify configurations etc. as the car is good at idle but cuts when I try to accelerate.
Regards,
Rey
02-27-2023, 04:13 PM
#737
3rd Gear
Join Date: Nov 2020
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Thanks Chris,
I was able to solve the issue yesterday after Peep sent me instructions on how to upload the firmware again. Apparently I messed something during initial installation/setup. Now I working on learning how to modify configurations etc. as the car is good at idle but cuts when I try to accelerate.
Regards,
Rey
I was able to solve the issue yesterday after Peep sent me instructions on how to upload the firmware again. Apparently I messed something during initial installation/setup. Now I working on learning how to modify configurations etc. as the car is good at idle but cuts when I try to accelerate.
Regards,
Rey
06-28-2023, 04:07 PM
#738
Advanced
Hey guys, I'm just starting my vems install and had a question regarding the optional oil temp sensor. It came with a harness but I couldn't find the pin outs on the pdf online. Does anyone know the pins for the vems harness? Thanks.
10-17-2023, 02:11 PM
#739
Hello,
Happy New Year to everyone,
I´m hoping someone can help me with some inside knowledge of vems.
I have a V3.3 (bought from Peep as a pnp as i really didn´t want to be going into the nittygritty diy of ecu´s at the mo) installed on a Porsche 944 turbo. It starts, idles and runs great on a good start BUT on about 50% of starts it is BAD and has a light misfire (like a vac leak or weak spark), almost dies on accel (like a carb accel pump not working) and has `hard´ backfires on rapid decels (like a bad vac leak).
Once started in this state it will not recover unless restarted (ecu reset ?) and is immediately obvious by the popping sounds at idle in the exhaust.
At idle (800rpm) The 02 is approx .05 higher than a good start (i presume unburnt fuel?) and very unstable as are the rpms & 02 with tps held at 4%.
Turn it off & on again and it will run perfect - 02 @ 99 or wherever it is set, no misfire, backfire etc.
I´ve tried all external troubleshooting i can find & think of, and am now wondering if its possible for Vems to initialise and latch in a state that can cause these issues until the power is cycled.
I was running WS with new leads (from Peep), but for t/s have put the orig stock coil n cap/leads back in, tried 3 new ws coils, deactivated and plugged the IAC, 2 new sets of plugs (resistor & non), checked for vac leaks, swapped inj, ign Channels & pins, jiggled harness´s conned out connectors, checked tps sweep, disabled inj cha´s during idle but cant find anything wrong.
Trigger logs look good, timing strobe looks good steady n solid also.
Cylinder head recon & turbo were replaced at the same time as installing vems.
Next thing i´m going to try is reinstalling the Motronic ecu but i was hoping for some ideas before doing that.
Logs & Trigger files attached. (Maps are untested at this time & idle is setup for t/s this problem - Idle EGO/Timing control deactivated)
Any advice appreciated,
Thanks !
Happy New Year to everyone,
I´m hoping someone can help me with some inside knowledge of vems.
I have a V3.3 (bought from Peep as a pnp as i really didn´t want to be going into the nittygritty diy of ecu´s at the mo) installed on a Porsche 944 turbo. It starts, idles and runs great on a good start BUT on about 50% of starts it is BAD and has a light misfire (like a vac leak or weak spark), almost dies on accel (like a carb accel pump not working) and has `hard´ backfires on rapid decels (like a bad vac leak).
Once started in this state it will not recover unless restarted (ecu reset ?) and is immediately obvious by the popping sounds at idle in the exhaust.
At idle (800rpm) The 02 is approx .05 higher than a good start (i presume unburnt fuel?) and very unstable as are the rpms & 02 with tps held at 4%.
Turn it off & on again and it will run perfect - 02 @ 99 or wherever it is set, no misfire, backfire etc.
I´ve tried all external troubleshooting i can find & think of, and am now wondering if its possible for Vems to initialise and latch in a state that can cause these issues until the power is cycled.
I was running WS with new leads (from Peep), but for t/s have put the orig stock coil n cap/leads back in, tried 3 new ws coils, deactivated and plugged the IAC, 2 new sets of plugs (resistor & non), checked for vac leaks, swapped inj, ign Channels & pins, jiggled harness´s conned out connectors, checked tps sweep, disabled inj cha´s during idle but cant find anything wrong.
Trigger logs look good, timing strobe looks good steady n solid also.
Cylinder head recon & turbo were replaced at the same time as installing vems.
Next thing i´m going to try is reinstalling the Motronic ecu but i was hoping for some ideas before doing that.
Logs & Trigger files attached. (Maps are untested at this time & idle is setup for t/s this problem - Idle EGO/Timing control deactivated)
Any advice appreciated,
Thanks !
I am now having the intermittent bad start issue as well. Like clockwork, on the 4th restart the issue is resolved and I have a normal idle. It doesn't appear to happen all the time but when it does I get a rough idle running .05-.10 lean , popping and misfiring. 4th restart I get a perfect rock solid .98.
We have no idea what's causing this still ?