2000 explorer primary ignition waveforms
- Thread starter rdaleyj
- Start date
You'll probably have to pull the right front wheel and fender shield to get the right hand bank. IIRC you can get the LH bank from the top.
Have you seen the Pico stuff? Their entry level stuff is pretty reasonable.
http://www.picotech.com/picoscope2000.html
thnx matt, and picos equipment is waaaay out of my affordability. but i think pico has 8 channels you can monitor which gives you a better chance of seeing a dropout
on a signal. oh and i went and signed up with iatn and theres a 72 hour check period where i hope they don't really follow up..
on a signal. oh and i went and signed up with iatn and theres a 72 hour check period where i hope they don't really follow up..
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Might want to get a good start by setting your scope up correctly. I'm not an expert on Fluke scopes (though I'd love to get my hands on one to play with), but it looks like you are set up on A/C voltage on the primary, where that circuit is a DC circuit. A/C coupling won't really add much to what you are trying to look at in this case. You may also want to try to grab a capture off a snap throttle and really load the coil down to see what's going on. Usually idle captures don't show a whole lot, unless there is something obvious going on.
Just FYI, the waveform library is only available to sponsoring members, which runs $45/qtr. Not the greatest deal if you don't use the rest of the website.
While it's a hell of a deal, it's not unheard of. One of my co-workers picked up a 192c with a full set of probes, 10:1 attenuator, secondary ignition adapter, low amp probe, and a high amp probe for $450. Not exactly the same machine, but pretty close. These things are pretty outdated when it comes to automotive use, but still useful in the right hands. Kinda like the heritage Vantage units I love so much. Last list price was around $1800 or so, and I paid about $600 for my first one, and $110 for my second. Things like this don't exactly hold their value well.
Don't wish too hard, for what the genesys runs you could have a Solus pro if you want to go aftermarket, or one (possibly two) OE scan tools. Either is a better choice IMO. We have a genesys at work, and I hate using it, it's terribly slow, buggy, and the bi-directional controls are pretty limited.
You may also want to current ramp the primary ignition system to see what's going on. Often times, that can tell you just as much as the voltage trace.
If that truck has the DIS coil pack setup instead of COP, make sure you are grabbing your waveforms in the proper orientation. You should have one half of the coil firing positive, and one half firing negative. You might need to invert the signal to get them to look the same, and you need to make sure that you are grabbing the ignition event happening on the compression stroke and not the exhaust stroke, they do look different.
If that truck has the DIS coil pack setup instead of COP, make sure you are grabbing your waveforms in the proper orientation. You should have one half of the coil firing positive, and one half firing negative. You might need to invert the signal to get them to look the same, and you need to make sure that you are grabbing the ignition event happening on the compression stroke and not the exhaust stroke, they do look different.
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oh its set to dc volts and i got enough of a view so far to warrant a plug change, after that i can invert the waveform and snap throttle.
and im glad to finally get some realistic input on the genesys scantools bi-directional capabilities. i have read it somewhere else though.
and im glad to finally get some realistic input on the genesys scantools bi-directional capabilities. i have read it somewhere else though.
after plug change waveform looks much better with a burn time of 1.440ms taken off the coil neg side.
one thing i notice about this explorer is upon a cold startup the pcm is in openloop only for about 5 seconds engin temp 100 deg and within that 5 seconds it goes into closed loop. sound off to anybody?
and yes the invert shows exhaust with much lower voltage.
one thing i notice about this explorer is upon a cold startup the pcm is in openloop only for about 5 seconds engin temp 100 deg and within that 5 seconds it goes into closed loop. sound off to anybody?
and yes the invert shows exhaust with much lower voltage.
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Looks a lot better to me (even if these look like secondary ign pics) though you could use a shorter timebase to get a better look still, you should be able to shorten it by at least half if not more. You could run the vehicle as is, or play with it a bit more. From what I can tell in your capture, peak kV is around 6kV and if that's the case, the spark line is sitting at around 2kV, which is a bit high (but not excessively so). Go ahead and grab a couple captures at snap throttle and see what changes.
MrMark
Well-known member
Is full scale 11 volts. I can't read it.
It's a DC waveform remember.
It's a DC waveform remember.
Four wire input on the coil right? Looks like you are hooked up to the coil B+ wire, which should be a red/light green stripe. You need to be on any of the tan ground wires. Tn/wht is cylinders 2&6. Tn/og is cylinders 3&4. Tn/lg is cylinders 1&5. After you get the coil you want to look at, hook up your sync clamp to narrow it down to individual cylinders.
Not on the primary side, short of using as many channels as you have cylinders. You could current ramp all of them with a loop at the fuse or around the red w/ light green stripe wire, but that's not quite the same thing. You can get a secondary parade with a mixer like Snap-On's SIA2000, but you need a pickup for each cylinder.
You can get them at places like aeswave.com, but IMO you get what you pay for. I use a Snap-On with my scopes, and it's decent even if a bit spendy.
well then i guess its 2ndary cylinder by cylinder..
