Snap-On Little Red Brick Diagostic tool

[fastfredracing]

Originally Posted by Bob Kontak

Been using the brick for a couple of months now. Still learning. Having the box does not make you a wizard, even if you have been messing with cars forever.

Here's proof. 99 F250. Stalling. In O2 closed loop, system will spit out lean / center / rich / center / lean and so on if all is well. Dithering like in CIS.

I was getting lean / center / lean / center. No rich.

Cleaned out the IAC valve, checked the plugs (rich) and several other things. Pulling my hair out. I then blipped the throttle for no real reason and the accordion thingie on the air snorkle scrunched together. WTF? The tube shrunk in length.

I am not going to tell you the answer but I'll give you a hint below. There is something to taking the time for the basics before you get into it.

Here is new:



Here is old:

That is great Bob, never skip the basics, it has happened to all of us. You get off on a diagnostic adventure, and before you know it , you are condeming sensors, ecm,s and all sorts of other complicated stuff, only to find out it was a clogged fuel filter, or something simple like that.
Glad it is working out for you, they are handy. It is nice to be able to read all the sensors data live when you have a problem. Did it come with the troubelshooter cartridges also? I remember them being pretty handy, and there is also lots to learn there.

[Bob Kontak]

Originally Posted by fastfredracing

Did it come with the troubelshooter cartridges also? I remember them being pretty handy, and there is also lots to learn there.

Yes, I have them. I did stop back to see the guy who sold it to me and I was blathering about how cool the thing is and how I looked up fuel trim on the internet and found I was way out of range on a car.

He said, "Dude, you don't need the internet. All that explanation stuff is in the cartridges".

I am guilty of not digging into them deeply, though. I bet if I back track there will be reference to an air restriction.