This would be a good scenario to be able to watch live data when the idle starts slowing down and it dies. Pretty much all the bidirectional scanners out through these days have that ability. (As well as reading trouble codes and clearing them of course) Cheaper in the long run than to keep throwing parts at it. You can select several parameters for it to display and track.... Drive around with it plugged into the OBD2 port..... Either look at it when the symptoms show up or replay the live data afterwards. It should point you exactly to the component that's causing the issue.
2007 Yukon Denali Intermittent Crank No Start
- Thread starter Maxpower_454
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Maxpower_454
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Whats the most common scanner that has that capability? Where do I start?
Just look on Amazon for bidirectional scanners, and read the description to make sure it has live data capability. Autel make some pretty popular ones. Generally, the more you pay the more features it has. Doing a crankshaft or Cam relearn is a good one, as well as the ABS bleeding and being able to send commands to different modules to test them. There are some inexpensive ones on the market now that do all that and more. It pays the shop around and look at the features and make sure you read the reviews. It's hard to beat a Tech 2, the actual tool GM uses for diagnostics... but finding a genuine one tends to be rather expensive. There are Chinese clones out there that seem to work fairly well. Any of the above are really a necessity these days. They usually pay for themselves the first one or two times you use it.... When you look at what the dealer or shops charge for a simple diagnostic.
in general, if you don't need to use it across different platforms. the clone tech 2 is the cheapest easiest to use.
I don't believe I've seen anyone show how to graph out can bus stuff with them. but for 200$ it's pretty hard to beat. I keep mine in the truck during any road trip.
I don't believe I've seen anyone show how to graph out can bus stuff with them. but for 200$ it's pretty hard to beat. I keep mine in the truck during any road trip.
Jarhead123
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I had the same issue. Drove me nuts for weeks. Turns out it was a bad ground cable running to the alternator. I replaced it a few years ago and never had a problem since. Doesn't make any sense to me but it worked.
Bad ground connections on these vehicles create all sorts of havoc. I suspect it has to do with the electricity searching through other modules looking for the ground. Sets off all sorts of warnings.... And many times it's just the battery terminals, ground cable, the strap to the firewall...
Charlie207
Full Access Member
Don't forget the ground connection down below/behind the PS pump & bracket, on the block. The cam position sensor is grounded there, and that's a prime spot for rust and corrosion.
