Ignition cuts out intermittently

Booton · Post by **Booton** » Sat Dec 08, 2012 9:18 am

Hi

I've been running MJLv3 for a while with no problems. In the last couple of weeks the car has developed a problem where the ignition cuts out whilst driving along for a few seconds, stone dead for a bit followed by massive backfire once the exhaust sensor gets hold of the unburnt fuel then it comes back to life.

Most evident when cruising at 4000rpm (4 speed box) for a few mins. I have shift lights which don't come on so it's not hitting a false rev limit. AFR is good. Electronic tachometer connected to MJL flat lines when it does it. I have double checked connections.

Any help would be much appreciated

Cheers
Nick

cng1 · Post by **cng1** » Sat Dec 08, 2012 10:14 pm

Check that your crank sensor mounting or trigger wheel hasn't got knocked slightly out of position. That sort of thing often manifests itself in the way that you describe.

Post by **brentp** » Mon Dec 10, 2012 4:36 pm

Also, make sure your sensor bracket is extremely rigid. any excessive harmonic vibrations around a certain RPM will cause the system to misfire around that range.

Booton · Post by **Booton** » Tue Dec 11, 2012 8:44 am

Gents

Thanks for the replies. I've changed to a different bracket and so far so good, no further problems. Thanks for the great advice

Cheers
Nick

chris_1300 · Post by **chris_1300** » Mon Jan 07, 2013 12:26 am

I have exactly the same symptoms you describe, however, mine seems to be ok with the ignition retarded. Have you had any problems since?