Autosport Labs

Mystery Solved, turns out the sensor was gapped correctly but the alignment was slightly off, ie too far from the crank axis, so it was only reading the edges of the tooth not the whole tooth. Being a hidden system its really hard to see in there, so I had to take off a bunch of tin-ware to get a go...

Took it for a good run today after running through the wiring and finding nothing obvious at any of the connections. Managed to trigger the problem on the highway at 60mph on flat ground at about 3200 rpm. On the way home I unplugged the MJLJ and ran with just the edis and again managed to trigger t...

Thanks for the quick reply Brent, I forgot to mention, that I checked the crank sensor gap prior to making that log. The bracket is very short and unlikely to flex. It points to the back of the pulley rather than the edge. (Picture of the hardware below.) I'll run through the wiring and make a limp ...

Bringing this post back from the dead. After 5000Km last year with no issues at all, the problem has returned, on the first two drives of the year. I managed to get some runtime data while it occurred this time, two instances on one session. I've attached a screen shot. The red RPM trace flatlines f...

Just a two year follow up to say we found the culprit. (I've been running with distributor for a long time now) so I was happy with the fuel side so it was time to have another crack. The issue was too much crank float which caused the sensor to touch the trigger wheel at just a certain rpm and load...

I just tried it with the megajolt unplugged and it still happened, but I had to push it harder before it did. The bracket is one I bought from mario at the dubshop. It is very short and there isnt a lot of room for vibration but ill double check. It only happens under load, not with the vehicle stat...

It turns out my mechanic buddy's diagnosis is bad too. I switched out the coil for a brand new one, new plug wires too, changed my jetting slightly (richer mains, leaner idles) and it hasn't got any better. I've added advance, taken it away and I cant get rid of the problem. It happens at about 2500...

Well it turns out I have two problems at the same time. A bad coil (brand new aftermarket) and it only goes wrong once the engine is warm and too small main jets in my carbs. Switched out the coil for a ford one one and much better. Still got to deal with the carbs.

Thanks BrentP. I made some progress this morning and made a really conservative map with the same advance for all load conditions. Dramatic improvement. Not massive performance but smooth, and no backfiring. Definitely have a usable starting point now. I'll double check with my timing light to verif...

I unplugged the megajolt and it runs much smoother on edis alone. So I made a map with all points at 10 degrees (limp mode map) hooked the megajolt back up and it runs much rougher with lots of misfiring. So it has to be megajolt or wiring. Correct?

HI, I'm new to all this. First post first vehicle without a distributor. I've built myself a 2276cc naturally aspirated VW motor (Empi HPMX carbs) for my bus. Megajolt with map installed. It is undriveable under load. I found a map that is close to a stock VW distributor as my starting point, but I ...