Wunderon
Well Known Member
New IO-360M1B, 13 hours. Starting to investigate LOP operations. As I lean past peak (8000', around 60% power) I get continuous 'miss-fires' or 'burbling', which continue as I lean further until the engine starts to quit. Enriching back to ROP clears any symptoms.
I'm assuming injector nozzle or perhaps spark plugs. All other engine operations seem normal as far as I can tell. Mag check at altitude seemed ok, generally increased EGT but smooth running.
Avstar servo, spider, and injectors. Slick Impulse and PMAG. Checked timing, cleaned and gapped plugs before first start.
Can we tell which one or more cylinders might be causing the issue from this info?
You can see that number 2 stays pretty rich, hardly peaking, while the misfiring appears in the RPM. #2 CHT also runs higher, which I suppose makes sense. I did check the #1 and #2 probes for accuracy.
The gami spread is around 0.5 I think.
Thanks!
dave
I'm assuming injector nozzle or perhaps spark plugs. All other engine operations seem normal as far as I can tell. Mag check at altitude seemed ok, generally increased EGT but smooth running.
Avstar servo, spider, and injectors. Slick Impulse and PMAG. Checked timing, cleaned and gapped plugs before first start.
Can we tell which one or more cylinders might be causing the issue from this info?
You can see that number 2 stays pretty rich, hardly peaking, while the misfiring appears in the RPM. #2 CHT also runs higher, which I suppose makes sense. I did check the #1 and #2 probes for accuracy.
The gami spread is around 0.5 I think.
Thanks!
dave