Michaelk9090

Sync loss at 4k rpm. Ms3x on a 99 1.8. Everything is stock besides aem eugo wideband and gm ait. Any help would be great. I can post a log if anyone wants, just lmk what type since im really not sure whats going on. Tuning the pots in the ms has led to pretty much no change. I was getting sync loss at like 1k but i managed to get it up to 4k. Nothing above 4k from tuning r56 pot.
Edit: cam angle sensor losing sync, there is a log down below but idk what could be told from it really. Please help im kinda desperate.

Dr.Sep

check the distance from your crank sensor to the tooth wheel... only supposed to be around the width of a credit card, I am wondering if as your RPMS increase it introduces a little wobble that moves the trigger wheel just outside of the pickup zone. Its quick enough to check and confirm or eliminate it as an issue

Michaelk9090

i cant push it any closer right now because i just drove a bit and it is qut hot but it looks closer to a gap of 2 maybe 2.5 mms. Thicker than a credit card for sure...

Michaelk9090

Update: moved the crank position sensor into the right place and nothing has been fixed :/ not really sure what to do here.

HowPrayGame

Get a composite log of the sync loss and see what sensor is acting up

Michaelk9090

I cant really make much of this, lmk if you want anything different. Im at a loss here.

edit: those spikes in the red are from fuel cut from sync loss i think

Michaelk9090

Ok so it looks like my cam sensor is dropping out. But why?

HowPrayGame

Replace cam sensor, check to ensure cam sensor is snug to electrical connector, possibly hardwire the 3 wires to the cam sensor w/ RTV as the connector can fail sometimes, maybe just zip tie the connector to the sensor if it comes loose on bumps (mine did this before).

Maybe replace with a ballenger motorsports cam sensor + new connector if heat related cam sensor failure occurs.

That's about all I've got, get a decent cam sensor in there first and see what happens.

Michaelk9090

The car ran fine on the stock ecu before. There was literally not a thing wrong :/ guess theres no way around it...

Michaelk9090

Actually I refuse to believe it needs to be replaced. The car has 58k miles and ik that these sensors go bad, but i just couldnt see it. Plus the car ran perfect before switching to ms. Gotta be a connection issue or something.

Michaelk9090

Im gonna make a new thread called cam position sensor losing sync because i am desperate and also don't know if i can change the name of a thread.

Fireindc

iTrader: (13)

Are you using rising edge or falling edge? Try switching to falling from rising, or rising to falling, and see if there's any effect. Also keep in mind that you must re-time the car after doing so, as it will advance/retard a few degrees. I was repeatedly losing sync and this fixed it for me.