Scan tool or car problem?

[JRB 9966]

I use an AutoXray EZLink. I just changed plug wires and was doing some routine monitoring while driving to check for misfires.

Odd thing, I periodically get "Total misfires" counts that are always divisible by 8 such as 512, 1024, 1536 while all 8 cylinder counts stays at 0.

It usually happens at or shortly after starting the engine and sometimes during the drive when I downshift.

So what is it counting as a misfire if it sees no misfires on any cylinder?
Is my scan tool hosed up?

When I first changed the wires I took it for a spin around the block and it seemed fine. No misfire counts. When I started to bolt the shock tower brace back on I noticed that the #6 boot had come off the coil pack. I'm beginning to wonder if this tool can even read a misfire.

Anybody seen anything like this?

Thanks,
John

[tblu92]

I have an Auto X-ray EZ Scan 5000---I am having the similar results with the whole misfire monitor system as well---It just does weird stuff always and I finally just choose to ignore it---Don't get me wrong I love the tool and the rest of the tool is spot on and very handy to monitor AFR thru narrow band voltages--LTFT fueltrims--timing--knock retard--etc. etc.I have since purchased EFILIVE that has wonderful real-time data logging-but I still use the EZ Scan sometimes to erase codes as its way faster and on some older vehicles that EFILIVE does not support with their scan tool I use the EZ Scan
to monitor data.I've checked the erroneous misfire counts with EZ Scan against the EFILIVE misfire system and it proves that the EZ Scan counts are false.

[JRB 9966]

Thanks for the reply. That is quite interesting.

My old EZLink is ancient compared to your EZ Scan 5000. I wonder why they have trouble reading misfire conditions.

It is a good tool and has paid for it self many times on both my car and my wife's. Still I think I need an upgrade.

Thanks again,
John