Possible noise condition?

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nano
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Possible noise condition?

Post by nano »

Hi all! I'm running a MS1/PCB3.0 on my boosted Honda CRX. I'm using 029y4 firmware.

Some days ago I've noticed some misfires and glitches when boosting (~12/15 psi). When running on low MAP loads everything is fine, so yesterday's night I've logged a bit and then...

Image

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As you can see, suddenly duty cycle goes near 0 without any reason, is this a noisy condition?

This is my current tune and my last log

Today I'm going to do some cable management and improves to my Megasquirt.

Thanks in advice,
Matt Cramer
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Re: Possible noise condition?

Post by Matt Cramer »

Duty cycle going to zero generally indicates a fuel cut of some sort, such as a rev limiter.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
kjones6039
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Re: Possible noise condition?

Post by kjones6039 »

Matt Cramer wrote:Duty cycle going to zero generally indicates a fuel cut of some sort, such as a rev limiter.
Yep..... Dropping to zero at ~7400 rpm.... right where he has it set in his msq!

Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/extra 3.4.2 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
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TinyIOX from JBPerformance
nano
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Re: Possible noise condition?

Post by nano »

Oh, I'm a fool. :lol:

Sorry about that, btw I know I have that misfires so I'll keep testing.
nano
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Re: Possible noise condition?

Post by nano »

Hi everybody! Following with my noisy problems, I've tested other Megasquirt I was building for a friend, so I've loaded my MSQ, then cranking and it runs very well!

I've made some pulls and everything work'd fine, so I plugged in my Megasquirt again, and everything works fine again!! So, my problem is around my messy wiring installation.
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