Author Topic: CA18DET misfires  (Read 14896 times)

Offline ASSA

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CA18DET misfires
« on: November 20, 2007, 08:00:31 pm »
Hi
My COP's connected through the "Power Transistor" to vems 5v ign outputs
I put 2.5ms dwell time but it still misfires
What is the problem, coils , injectors(550cc venom)?

I post my config too...
200sx_cfg.rar

Offline rob@vems.co.uk

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Re: CA18DET misfires
« Reply #1 on: November 20, 2007, 11:03:12 pm »
Where does it misfire, RPM, load or boost?  Can you provide a datalog and MSQ for this please?
You certainly dont need more than 1.9ms but 2.5 wont cause an issue.

Offline ASSA

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Re: CA18DET misfires
« Reply #2 on: November 21, 2007, 12:04:35 am »
Where does it misfire, RPM, load or boost?  Can you provide a datalog and MSQ for this please?
You certainly dont need more than 1.9ms but 2.5 wont cause an issue.
msq, log and idle video http://www.hot.ee/zassaz/200sx_cfg.rar
Misfires at idle and ~1900 rpm too

Then AFR is about 11 it  idles properly but then AFR 13.5 and more it misfires or (I don't know what it is)

And  more idle log
200sx_3log.rar
Driving log
200sx_1log.rar
« Last Edit: November 21, 2007, 01:12:59 am by ASSA »

Offline ASSA

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Re: CA18DET misfires
« Reply #3 on: November 22, 2007, 01:07:53 am »
Please check my injector and ignition output settings  to ...

Offline rob@vems.co.uk

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Re: CA18DET misfires
« Reply #4 on: November 22, 2007, 04:57:38 pm »
Do you have to compress them?  If so please use zip I dont have RAR file abilities here.

Offline ASSA

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Re: CA18DET misfires
« Reply #5 on: November 22, 2007, 09:45:04 pm »

Offline rob@vems.co.uk

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Re: CA18DET misfires
« Reply #6 on: November 23, 2007, 09:25:26 am »
If you're using the logic drivers to control the coil you might want to try the stepper outputs, but I think the problem is likely to be related to the configs.

First off, Anti-lag doesnt look to have been switched off correctly, in Extras->Advanced ALS set:
Input channel used to Disabled
Set all of your RPM values to 25500

In your Extras->Launch Control settings:
Set the RPM values to 25500

In Extras->Idle Settings Advance/PID:
Disable your Ignition based Idle control

Looking at your Settings->Primary Trigger Settings I'd set trigger tooth to 2 rather than 3 and reset the TDC after the trigger value to a correspondingly higher number, you ideally want to be around 120 to 60 deg BTDC.

Offline ASSA

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Re: CA18DET misfires
« Reply #7 on: November 27, 2007, 04:32:27 am »
It seems that changing Primary Trigger Settings as you told me helps. Missfires age gone ;)

Offline BenFenner

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Re: CA18DET misfires
« Reply #8 on: November 27, 2007, 04:58:59 pm »
Another ballin' Rob diagnosis. =]
1994 Black SE-R (VEMS, going turbo)
1994 Black SE-R (with sunroof)

Offline ASSA

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Re: CA18DET misfires
« Reply #9 on: December 06, 2007, 09:38:38 am »
If my ignition sequence is 3-4-2-1 which injector sequence is better ?

Offline rob@vems.co.uk

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Re: CA18DET misfires
« Reply #10 on: December 06, 2007, 09:54:45 am »
Injecting on the firing stroke, as it will give the fuel a lot of time to sit on the back of the inlet valves and evaporate.