AEM Infinity sync state issue

Guys, I am having troubles at times when starting my engine.

The following happens, at times my engine starts just fine within first try. However at times I need to remove key and try again numberous times before I get it started.

I am able to see in the logs when everything goes fine I get and hold SyncState "1". The times I am not able to start the engine SyncState is only shortly "1" and quickly returns to "0".

At the crankshaft angles I can see it doesn't count till 660 or 690 degree which it does in the log where the engine does start. And I get the Cam0_SyncError1 and Cam0_SyncError2. When I remove key and try again (often numberous times) eventually I do get SyncState "1" and the car runs just fine.

Something that I think is strange: Why the crankshaft sensor does not count till 720.

FYI: I am new to standalone tuning, however I did follow the course. Ignition sync has been carried out. Car runs just fine when it does start.

My questions:

- Should I use the Trigger offset to get this better?

- Is the ResyncValue the cause of the car starting after the first failing attempt?

I have attached 2 AEM Logs.

Help would be much appreciated.

Remember, one complete combustion cycle requires two revolutions of the crankshaft, but because the crankshaft sensor counts for every revolution it needs the camshaft sensor to tell the ECU if it's on the exhaust or compression & ignition part of the cycle.

I can't read the attachments, but from what you say, and the sync' errors mentioned, I'd say your camshaft sensor, or its, wiring is faulty. When it doesn't start I'd expect it to be because the ECU is reading the crank signal OK, but it's 360 degrees out, when it does start it's picked it up correctly. Once the engine is running it doesn't need the cam' signal and it can run straight off the crankshaft.

Thank you for the reply Gord.

Have checked both camshaft sensors. Both same product numbers, have swapped them, still same. Looked up in the Honda Service Manual which values they should be when measuring resistance. Both sensors within spec. Have measured the wires from sensor to end of OEM loom at ECU side, also OK. From there it goes into a harness from OEM loom to AEM infinity. Have not found the Pinout for this yet.

Value of Cam1 always at 0, and only Cam0 value is changing with starting or running engine, even when I swap the sensors. And only Cam0 gets Sync faults. (With engine that does and does not start the same).

Pinout through AEM infinity software only describes Camshaft Position Sensor 1 VR- and Camshaft Position Sensor 1 VR+. To me it looks like the AEM infinity only uses 1 camshaft sensor?

Before switching to the AEM Infinity I never had any issues with getting the engine to run on the OEM ECU.

You've moved beyond me there, but for the guys and gals familiar with the engine and AEM, it may help if you gave the model of the ECU you're using?

Thanks for the effort @Gord.

I am using the AEM Infinity 506 on a Honda S2000 with the F20C engine with a Paxton Novi 1200 supercharger.