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Old 04-16-2010, 06:11 PM   #1
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Default Trouble with MS.

Hi, just went over to my friends house to hook up my MS. It was fine, ran, set timing, checked over settings and voela, it ran just fine at idle, and when revving.

The problem exists when I tried to move. I was sitting at a stoplight and when it turned green I almost stalled the damn thing. It had some serious backfirage and power loss when I was in the low RPMs. Flooring it was the only way to BARELY get going. However, once I hit a certain speed, it would jerk forward violently as it resumed as it should. I'm not sure what RPMs it was at that it did this, since my RPM gauge stopped working with the installation(?). It was so bad that I had to pull over and put the stocker back in.

When I put the stocker back in, I noticed that circular ground coming out of the cable right before the harness plugs into the ECU wasn't hooked up to anything. Could this have been the cause? I hooked it up when I put the stocker back in and then everything ran just fine.

Also, since I pulled the MS, will I have to set the timing with a timing light again? I still have the settings from when I set it up, can I just punch these in again, or even though it's unplugged did the MS still save them?

What could have possibly caused this? Timing was setup at a fixed 10* and it was changed back to static for driving. It feels like a timing issue since it was backfiring and the sudden jerk of power made me think so too.

Also, what's up with the RPM gauge?

This is a Brain built MS-I
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Old 04-16-2010, 06:34 PM   #2
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Timing should stay the same once you put it back in.

No way to tell for sure on the ground, hook it up and try it.

What are you're AFRs while this is happening? Datalogs?
--Alex
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Old 04-16-2010, 11:49 PM   #3
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Here's my datalogs:
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If I'm reading it correctly, it seems like mashing the throttle causes the spark to cut for some reason. But then again, I'm probably not reading it correctly
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Old 04-17-2010, 09:56 AM   #4
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Where's your AFRs?
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Old 04-17-2010, 11:44 AM   #5
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Nm

Last edited by ZNuT; 04-17-2010 at 12:51 PM. Reason: Noob
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Old 04-17-2010, 12:46 PM   #6
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Originally Posted by ZNuT View Post
Looks like to me your MAT is off the scale. Most likely the sensor is disconnected and your ms is trying to give it way to much fuel. Every time you pw goes up you loose power. Thats my theory
Forgive my noob question, but what is MAT? Manifold Air Temp? If that's what it is, it reads correctly on the main page.
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Old 04-17-2010, 12:51 PM   #7
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Originally Posted by rider384 View Post
Forgive my noob question, but what is MAT? Manifold Air Temp? If that's what it is, it reads correctly on the main page.
NM I just looked at you graph more thoroughly and now see it is off the graph but still reads the right temp.
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Old 04-17-2010, 02:27 PM   #8
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Turned off open loop mode today and it made a lot of difference, but weirdly the o2 sensor was working with the stock ECU, and I had the settings right, I think...

Anyways, I took it out for a drive, and I can start it and even accelerate halfway decent now, but it feels rough in a couple of places and it almost feels like my ignition is way retarded from the stock map. But the timing light matched up with the mark on my 96, so I'm guessing it's just tuning I need now?

EDIT: Ok, it appears as though I have no o2 sensor readings. Thoughts?
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Old 04-17-2010, 07:03 PM   #9
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