Unusual Timing Fluctuations Viewed with Timing Light
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Re: Unusual Timing Fluctuations Viewed with Timing Light
Any update on this issue? I have a similar situation and engine set-up as OP. Gen 1 SBC 8 pin small cap external coil that momentarily cuts out (tack misses) at about 1500 rpm. I did some of the same exercises as OP (isolate wires add grounds ect).
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kjones6039
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Re: Unusual Timing Fluctuations Viewed with Timing Light
Post your log and msq......
Ken
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/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
Re: Unusual Timing Fluctuations Viewed with Timing Light
Here you go. I sure hope I loaded those correctly......The ignition skip or "going to zero" is at 3048.
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Re: Unusual Timing Fluctuations Viewed with Timing Light
There is an RPM drop (to zero) at 2885 and the other "ign skip" is at 3055 not 3048 as I stated above. There is no ignition skip at the 2885 RPM drop which seems odd, as tach signal comes from the coil.
Re: Unusual Timing Fluctuations Viewed with Timing Light
I also had a problem that sounds like it is similar to what you describe. The MSnE modification seemed to help it quite a bit, but vary rarely it would still pop up. I never did solve it. If you search my profile you will see I have a thread about the problem I was having. I am now switched over to EDIS-8 and haven't had any ignition issues since the switch.