2013 Chevrolet Equinox 2.4L bad injectors?
Posted to Technical Discussion Forum on 12/3/2020
89 Replies
Working on a 2013 Equinox that is bringing me to the edge.
This vehicle has a 2.4L with Direct injection injectors. I
have verified timing with a lab scope, has spark and
injector pulse. good compression across all 4 cylinders.
This car will start and run ( and run good ) on propane and
carb clean. Actually ran the car for close to 5 minutes just
on a can of propane hoping to set a code. Will not run on
injector cleaner hooked to the fuel rail, pressurized to
factory spec.
No codes in pcm or any other modules. no immobilizer light
or problems
[2012 Chevrolet Equinox LS, Ignition Waveform] [2013
Chevrolet Equinox LS, Ignition Waveform]
I'm making this post in hopes that people can interpret my
scope captures of these injectors, the drivers coming from
the pcm (high and low pulse) seem strong, but the amperage
waveform has something to be desired. I found a waveform in
the iatn library (what's left of it) of a good known and
bad, and the bad seems to match my waveform to the tee, I
don't like how rigid the edges are when the injector turns
off, it seems on the good known waveform I've found it has a
smooth rounded edge at the end of the waveform. I also
noticed my injector is pulling 10 amps (wow) while the
replaced injector is pulling 1.5 amps
[2013 Chevrolet Equinox LS, BATT/Charging/Starting
Waveform]
(known good)
Am I missing anything or is this a home run? I'm going to
attempt a injector balance test tomorrow morning when I
first start it with propane - because today when I ran it on
propane for the first time it ran for close to 5 minutes. I
wish I thought of it earlier but what do ya do. after that
it was quick running and stalling because of the freezing of
the propane lines. I have ohmed the injectors and they're
sitting around 2.5-2.8 ohms. spec is 1.5-2.3
Are there any other ways of testing these injectors? or are
these waveforms enough to confirm it's the reason it won't
light off?
I uploaded the PS files incase any scope jockey wants to
chime in on these waveforms
[2013 Chevrolet Equinox LS, Fuel Supply Waveform]
[2013 Chevrolet Equinox LS, Fuel Supply Waveform] [2013
Chevrolet Equinox LS, Fuel Supply Waveform]
Aaron Murphy Technician Buddy's Service Center Jonesboro, Georgia, USA
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