Microsquirt problems?
Thread Starter
Staging Lane
Joined: Apr 2014
Posts: 50
Likes: 0
Microsquirt problems? I have a 2005 l33 with twin on3 70mm turbos, 80lbs injectors, running microsquirt. I ran this all of last year and everything ran fine, started it up this year with nothing changed and it would lose sync at around 6200rpm, after a coup;e times running it would lose sync at around 4800rpm, a few times after that 3000rpm is all i could get it to do, and the logs show some extremely off rpms when it was stumbling as high as 17,000 rpm on the logs.
Now it won't show an rpm sync at all when cranking, trigger logger shows nothing, and it obviously won't start. Replaced the crank sensor and it didn't help. re-flashed the firmware and loaded denmahs base tune and still won't rpm sync.
Any help is appreciated, don't know if something got fouled up in my settings somehow or if the micro is bad, or the wheel is bad.
Now it won't show an rpm sync at all when cranking, trigger logger shows nothing, and it obviously won't start. Replaced the crank sensor and it didn't help. re-flashed the firmware and loaded denmahs base tune and still won't rpm sync.
Any help is appreciated, don't know if something got fouled up in my settings somehow or if the micro is bad, or the wheel is bad.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
You need to confirm your crank/cam triggers are working fine...which pretty much requires an oscilloscope unless the MS has some sort of trigger diagnostic.
Although you could check to ensure those sensors have correct and stable power supply and ground.
No wiring has changed or anything ?
Although you could check to ensure those sensors have correct and stable power supply and ground.
No wiring has changed or anything ?
being a m-squirt he is going to only have crank signal. I would open the m-squirt box open and check the resistors to see if one of them may have come loose and maybe even replace the resistors after all wiring has been double checked.
TECH Regular
Joined: Sep 2014
Posts: 433
Likes: 0
Absolute first place I'd look. I've seen similar issues, which seemed to be RPM related simply be a battery terminal that felt "snug enough", but not tight. If you can wiggle or pry the leads off the terminals, they're not tight enough. Same with ALL other connections.
Good luck with the fix. This stuff can be so damn frustrating. Hope it's something simple like this.
Trending Topics
Thread Starter
Staging Lane
Joined: Apr 2014
Posts: 50
Likes: 0
Crank sensor wiring appears to be good, resistors are all soldered on good, it did have a junk battery on it that I replaced, but it lost all its rpm signal with a good battery in it. Battery terminals aren't the greatest (have new ones on the way) but it was cranking over pretty good
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Crank sensors from autobone obeillys and such are junk. GM works great. Get used one if you have to off junkyard motor and try. I had one of theirs and it failed almost instantly. Check your fuse in harness for crank sensor and its wiring to make sure also. Was this a homemade harness or one you bought from EFI. Also make sure your RPM for cranking in firmware is low enough to start.
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN