AFR Freezing
My AFR reading is freezing up at 14.7. Seems the only way to fix it, is shit it off and wait a bit. Once I restart it, it fluctuates with throttle as it should. Any ideas?
What is your coolant temp and voltage on handheld when this happens. Unit may be in Open Loop. Also may have a bad ground. The Fitechs are very sensitive to ground.
I'll have to look at those readings. Never paid attention. The unit is grounded to the battery.
I have the same issue. Sometimes it freezes at start up and other times it's while I'm driving down the road. It usually corrects itself after several miles or several stop/start cycles. I replaced the O2 sensor and still get the random AFR lock up.
It's done at startup and when the temps are 180-200, voltage good, good grounds, etc. Runs great other than when it randomly freezes.
Which AFR is locking up? The actual reading or the target AFR? Are you running timing control?
The actual AFR and I am NOT using timing control
I wonder if you are getting electrical interference. Try moving your blue wire and/or shielding it. Datalog would help.
I just noticed an RPM Noise fault.
I'll work on that & see if it fixes the problem.
Shielding pinned post in Electrical
I bought some steel braided sleeve from Amazon, installed it over the tach wire, and grounded one end. So far, no more AFR freezing.
http://amazon.com/gp/product/B01BIBQESG/ref=od_aui_detailpages00?ie=UTF8&psc=1