Honda Pressure waveforms
Today I had some time to play around, and I had a 1983
Honda accord in the shop that was headed for the scrap yard.
I thought I would grab a few pressure waveforms from the
engine before I pulled the trigger on it's long lived life.
This car will not run, since it has an ignition problem, and
a transmission problem. I have a pressure transducer screwed
into the #1 spark plug hole. The green trace is a FLS
transducer plugged into the brake booster hose. I could not
trigger from a spark plug wire, since the engine will try to
start, and there is no practical way to disable the fuel
supply. I did hook an ignition probe on the coil wire, which
was hooked to a spark tester, and I did get a very good idea
of what was wrong with the ignition system. Capture #1 is
with nothing wrong with the engine. I put this up so that
you can use it as a baseline, and have something to compare
the other captures with. [1983 Honda Accord,
Engine/Propulsion waveform] Exhaust valve with the
adjuster backed out all the way. The exhaust valve is only
opening a very little bit. [1983 Honda Accord,
Engine/Propulsion waveform] Intake valve that is only
opening a very little bit. [1983 Honda Accord,
Engine/Propulsion waveform] Auxuliary valve that is not
closing all the way. With the engine cranking, the low
compression cannot be heard in the cranking cadence. Notice
the lower compression, and the difference in the lower
portion of the waveform. You can also see the problem in the
FLS capture (green trace) [1983 Honda Accord,
Engine/Propulsion waveform] Exhaust valve with .025"
clearance. [1983 Honda Accord, Engine/Propulsion
waveform] Tight exhaust valve. The low compression cannot
be heard in the cranking cadence. [1983 Honda Accord,
Engine/Propulsion waveform] Tight intake valve. The low
compression cannot be heard in the cranking cadence.
[1983 Honda Accord, Engine/Propulsion waveform] Albin from Washington
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