05-04-2014, 04:32 PM
Join Date: Mar 2012
Total Cats: 15
Misfire Cyl 2&3, CAS the culprit?
So I got my head back, and installed it over the weekend. Car runs better, but still not quite where it should be.
Idling at around 1000/1100, the engine was audibly misfiring, so we started disconnecting COPS to find the culprit. Right back to Cyl 2&3. Pulling the COP on either one had no noticeable effect on the idle, but plugging it back in, the engine note rose very slightly. So, 2&3 were doing something.
Took a timing light and ran it across all the cops on their own, and checked for the synchronicity of the light output. At first it looked like 2&3 were the ones that were dropping signal (We'd already swapped the COPS out to test them, and the problem followed the cylinders). We re-checked 1&4 and found out that they were dropping signal at about the same time as the misfire.
To double check the wiring, we ran a wire from the ECU Loom and cut/tapped it to the #2&3 signal wire for the COPS. Same problem.
That leaves only two possible scenarios (please correct me if I'm wrong)...
Either the ECU is stumbling on triggering the COPS (unlikely in my opinion, I have a high faith in Reverant's work... and yes, the ECU is setup for 2.3ms dwell on toyota COPS)
Or, the CAS is screwed up...
As luck would have it, I'm sitting on an NB Cam Cover in paint right now, as well as a Protege trigger wheel, some NB cam gears, and all the sensors from a '99 NB.
If I'm recalling what I read correctly, I have to splice the Crank Pulse to the white wire on the CAS Loom, and the Cam Pulse to the Blue-Yellow, and setup Megasquirt for a dual trigger setup?