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Old 10-01-2008, 07:39 PM   #1
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Default Flashed HR10G to MSPNP, small issue with misfires

Flashed HR10G to my MSPNP about an hour ago. Went through the MSQ page by page, set it up correctly, fired up on the 2nd keyturn (after I plugged the coils back in ). The control is incredible; I've never been able to get my car to idle this lean.

I seem to be getting a soft-cut rev limiter through most of the range, though, with the occasional blip. Any ideas? There isn't a whole lot of documentation on HR10G for the MSPNP specifically, although I did see Matt/Jerry mentioning something about a .1uF cap somewhere?

Feel free to just link me to something too.

Edit: MSQ added.
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File Type: zip map3.zip (5.3 KB, 63 views)

Last edited by Savington; 10-01-2008 at 08:15 PM.
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Old 10-01-2008, 10:14 PM   #2
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yeah, my car would do that a lot on the standard code. After the cap mod it would not do it at all... for a few thousand miles, it started doing it again, and shortly after awhile the car would not run at all, and it turned out to be a bad CAS, so there are at least two things that can cause this problem. More than likely, the cap mod will solve it, It's standard on the new PNP's now I believe.

Check this thread on it here:

https://www.miataturbo.net/forum/sho...hlight=Cap+mod
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Old 10-01-2008, 10:15 PM   #3
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oops hit refresh

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Old 10-01-2008, 11:46 PM   #4
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yes search .1uf, you'll see where and why you need to install one.
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Old 10-02-2008, 01:51 AM   #5
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****, my ECU is a bitch to get to and I really don't feel like soldering on it. >:/
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Old 10-02-2008, 02:04 AM   #6
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A bitch to get to in a '94? Or do you have it in a non-stock location? Just curious... cuz I thought behind pax seat was something to be grateful for...
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Old 10-02-2008, 02:48 AM   #7
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fixed momos don't help getting behind that seat do they? Good luck dude your the ginniepig!
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Old 10-02-2008, 03:03 AM   #8
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Quote:
Originally Posted by chucker View Post
A bitch to get to in a '94? Or do you have it in a non-stock location? Just curious... cuz I thought behind pax seat was something to be grateful for...
MOMOs bolted to the floor. I have to unbolt my seat to get to the ECU.
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Old 10-02-2008, 09:20 AM   #9
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Check the sticker on the underside of the MSPNP - if it identifies it as a Rev C, it already has the cap mod. It sounds like you have an earlier one that lacks the mod.
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Old 10-02-2008, 09:26 AM   #10
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Im running HR10g on my 94 MSPNP so we can share some experiences. BTW, The ECU is behind the passenger the kicker panel (EU/German car).

What sort of idle AFR are you looking at, at idle? I'm running around 14-ish but it jumps alot (untuned).
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Old 10-02-2008, 10:22 AM   #11
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.1uf or larger cap between JS8 and Ground in the proto area.
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Old 10-02-2008, 11:16 PM   #12
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Quote:
Originally Posted by Matt Cramer View Post
Check the sticker on the underside of the MSPNP - if it identifies it as a Rev C, it already has the cap mod. It sounds like you have an earlier one that lacks the mod.
My ECU is an extremely early beta MM9495, either the first or second one made. I am 100% certain the mod isn't done.
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Old 10-03-2008, 01:57 AM   #13
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Matt, I've never understood why this seems to be more of a problem for people when they migrate to the HR codebase. I just don't see what part of the wheel decoder would be more vulnerable. Do you guys have any inside intel on this?
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Old 10-03-2008, 06:39 AM   #14
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Cap installed (for everyone else, ceramic capacitors do NOT have polarity, doesn't matter which lead goes where), car is tuned to about 11psi right now. Misfires are gone. I cannot believe how smoothly it runs. Even my roommate (crashnscar) who was manning the laptop commented on how good it SOUNDED.
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Old 10-03-2008, 06:53 AM   #15
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Good to hear you got it solved!
Video's before/after?
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Old 10-03-2008, 11:06 AM   #16
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Quote:
Originally Posted by Joe Perez View Post
Matt, I've never understood why this seems to be more of a problem for people when they migrate to the HR codebase. I just don't see what part of the wheel decoder would be more vulnerable. Do you guys have any inside intel on this?
We're not sure either, but my guess is that the HR code somehow changes the sampling rate as the second trigger is polled rather than interrupt driven.
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