I went out to the airport today and ran the
engine up, did a quick full power runup and then went to the runway and took
off and landed (back on the same runway). Never ran better...matter of
fact never ran this well. What, might we ask made the dramatic
improvement? I call it reverse stupidity. A couple of days ago, I
went to a page on my MicroTech ECU handheld programmer that I had not
previously viewed. It showed rpm and water temp. My engine monitor showed a
water temp of 160 degrees F. The ECU monitor showed a water temp of
-24 degrees C. Not even close. To make a long story short, I had wired two
monitors to one water temp sending unit. After running the engine, the ECU
water temp climbed from -24C all the way up to -12C. I disconnected the
wire that went to the engine monitor, and the ECU water temp immediately went
up to 60C. Since the ECU varies fuel and timing based on water
temperatures, it was unable to do it's job correctly with inaccurate
water temp inputs. The cold start enrichment also was not functioning,
as the engine map's were supposed to start reducing mixture levels after
reaching 50 degrees C. It never saw those numbers, so it could not
function properly. Now, with the proper water temp inputs, it runs GREAT
!!! Cold start, warm up, idle through WOT is smooth as silk. To
think of all the time I wasted trying to program injector open times, etc on
an ECU that was receiving improper water temp information.
I should have known
better than to connect two monitors to one sending unit, but I did it anyway.
Just hoping others can learn from my mistake instead of making their
own.
Just when I had a
custom made mounting plate made for the HA-6 carburetor I just purchased, the
thing has to go and run like a swiss watch. Murphy wins again.
Take care. Paul Conner