Once again the purpose of this video is to teach you “flow”. What do you test first, where do you go next? I will embed the hyperlinks to three other videos …
No Start Diagnostics (1992 Chevy Lumina)
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Good tutorial but don’t forget to check the “INJ” fuse located at passenger side under the hood
no, my book is not scope specific
do you show how to use lab scope like snap on verus in your book
Connect the Dots
That’s basically how it is when fixing cars.
:-)
“i’m not stickin around, i’m done, it’s paytime”…That’s what i’m talking about!
ground side switched. there is a current limiting device in the computer. also the injectors are not energized long enough to blow the fuse
Paul,
Are these injectors power or ground side switched? Also, is this circuit fuse protected and, if so, wouldn’t the shorted injector(s) have blown it, or is there a limiting device in the computer?
Fast & Accurate, thanks for sharing this.
hi how did know the other 2 coils are ok without testing them for a spark ??
Ok, Thanks.
Buy the older Vantage, you will not be disappointed. It doesn’t have the detail as a true scope like the Vantage Pro does, but it has scoping type capabilities.
you can view injector waveforms, coil primary current ramps, ac sign waves and digital square waves.
also it has a 300 microsecond glitch capture capability. and an awesome data base that is unmatched in this field.
Thanks for the video Paul. I am looking to buy an older used scope. I have have never used an older vantage. Can you please explain the difference between a graphing DMM and a lab scope. Thanks, Matt.
Yes I’ve got a lot your videos saved on my laptop that I got off youtube. I watch them all the time over and over. The more I watch them is the more I learn. Thank you
watch my two part video on GM shorted injectors where I show how to use an ohmmeter on this design (the one where the intake covers all of the injectors)
I believe it was on a buick
@scannerdanner Iam having a problem with a vehicle similar to the problem except it starts but when u drive it for a while it wants to stall and then it turns off. Also can I just test the wires with a dvom of any kind?
how accurate is the snap on diagnostic mt 2400 vantage power graphing meter to test can and crank sensor i have the version 5.0
🙂 sounds like you’ve been paying attention. System design is a big part of it, isn’t it?
“I’m done, it’s pay time, time to go home”. I like that…… As Scannerdanner said, so quick n easy when u understand system design.
Everyday, well no, but when I need it, I need it, the biggest issue is knowing what is a good known waveform and a known bad waveform, Snap on is really great for having known good waveforms in the tool, plus helping you with set up of the scales and what wires to hook to etc.
HTH
Michael, how long did it take before you really got comfortable making calls with the scope? Do you use it almost everyday? Thankz. I am damn close to pull the trigger in buying one.
hahahaha!!! That is some fast cash, Why don’t you give classes out here in NewYork, like an adult program..Paul.
You’re right only one control wire, I was just wondering if it was possible to cut that wire and hook an ammeter to read the amperage. Normal amp draw should be around 4.2 A so anything above that would indicate a problem,correct?
don’t remember I think there was only one control wire on this model
Paul, on this system do you think it would be possible to hook an ammeter in series and read the peak amperage on that blue wire?
thank you!
Damn, he’s Sharp. Thumbs up great job.
correct and by the time GM went to SEFI systems, they got rid of these horrible multec1 injectors so they didn’t have this problems anymore.
Paul, on sequential firing engines this wouldn’t cause a no start, correct?
Thank you very much!
Greeting from the US my friend. Thank you
I was going to say the same thing, nice job correcting yourself 🙂
Also to add to this, if the control wire was shorted to ground it would be constant current flow and not three times the normal amount. Plus it would be completely flooded.
No, it doesn’t need one as all of the injectors are fired at the same time. And for coil sequencing the crank has a sync notch in it for cylinder pair ID (so it knows which waste spark coil to fire first)
This type of system doesn’t use a cam sensor?
I just realize that when the positive wires would make a good contact to the grond, that would cause a blown fuse. The computer switches the injector coils to the ground. A case of first think than write 🙂
wow, that’s awesome man. I have so much respect for guys like you. I just wish more of my students had that attitude. This field has so much to offer if only people would open their eyes!
Thank you my friend.
I just bought a vantage pro for my self mostly thanks to you. My shop has a verus but I can’t take it home. So to continue becoming a beter tech I come home and just play around with it. But I’m also a bit of a tool junkie have my own tech 2 and a launch diagun. My goal is to be the best tech I can be. And I owe a lot of credit to you thank you so much.
nope, watch my other videos on this. I have them hyper linked in this video.
@scannerdanner i was just reading some threads, could it be a possibility a PCM problem??
it would indicate a lamp circuit problem for sure.
@scannerdanner If test lite trick dose work, dose this indicate faulty batt lamp circuit Or bad connection?? And if dosen’t bad alternator??