cuts out at high RPM

General Topics for configuring, operating and tuning the Megajolt. Also see the <a href="http://www.autosportlabs.net/MJLJ_V4_Operation_Guide">Operation Guide</a>

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jano
Posts: 5
Joined: Tue Dec 26, 2006 3:57 pm

cuts out at high RPM

Post by jano »

I have now been running flawlessly with the megejolt for 5 years on my 1968 Lotus Super Seven.

But I'm starting to experiece some problems.
When hot and accelerating hard, the ignition cuts completely for a few (2-5) seconds, and then continues normally after that.
The hotter the worse.

Dosent sound like a MJ issue, as the EDIS "limp home" mode should cut in. But more like a EDIS, Coilpack or crank sensor issue.. Where and how to diagnose?

br

Jan O

Lazeum
Posts: 74
Joined: Mon Sep 17, 2012 3:03 pm
Location: Paris, France

Post by Lazeum »

have you tried to log with Megajolt to check that it operates normally? You could check if RPM are still being read, check if timing is still normal.
Are VR sensor bracket tight? Harness & wires are in good shape?
Any loose connectors on EDIS module, EDIS coilpack, MJLJ plug? One pin could have become loose overtime? With vibrations, you might have one wire getting shredded overtime with less and less wires attached to plug making the wire unable to hold high current for high rpm?
How does sensor connectors looks like? Any issue on TPS/MAP reading?

some had issue with map logged in MJLJ to be reset, have you check it also?
Mathieu

brentp
Site Admin
Posts: 6282
Joined: Wed Jan 24, 2007 6:36 am

Post by brentp »

What RPM does the system cut out at?

Agree on checking the VR sensor bracket.

Also, are you possibly running lean? is this showing up under load, light throttle or just revving in neutral?
Brent Picasso
CEO and Founder, Autosport Labs
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