If it Walks Like a Duck, Talks Like a Duck,
Posted to Technical Discussion Forum on 6/11/2013
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it must be a chicken!
Had a Intrepid towed in for a no-start. One of my techs had
a look at it. He said that it sounded like it was out of
time and thought he'd try this technique that he read about.
The technique is scoping cam and crank and see if they are
in sync.
Here is the capture he showed me of the crank and cam
during cranking.
Looking at known good captures, this capture is in sync.
Cranking the engine, it will kick back and backfire out of
the intake periodically. Definately sounds like its out of
time although the cam/crank says otherwise.
I thought it would be prudent to take a capture of
in-cylinder while we're cranking. Here is the capture of
cam/crank with #1 in-cylinder. Little different result eh?
It looks like it jumped time, but jumped to a spot that the
crank and cam pulses lined back up! I thought I'd share this
as it was pretty neat.
For those that use Pico, here is the scope capture in
psd format.
Harvey.
Harvey from British Columbia
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