Well ready for a wild one. My tps sensor kicked the bucket in the middle of a parade of all places. So I was in PE mode while idleing.... The funny thing is the sensor didn't just get some dead spots in it, it litterally jumped up to 50-60% while at idle and would peg out as soon as I touched the gas. So I limped it out of the parade and to the parts store and got a new sensor and now all the drivability problems I have been chasing around for ever went away. I had an intermittent miss that I just couldn't tune out, it was probably all the pump shot the ecm was dumping inot my motor. My gues is the tps was hopping around and dropping out and my slow aldl rate (747) wasn't picking up on it. That would also explain why I couldn't get it to go into open loop idle as well, and why highway mode wasn't working either.

Any way.......moral of the story, hook a volt meter to your sensor just to make sure.

Ohh yeah and last weekend I shaffed the ecm wires on the firewall and torched an ecm on the way to a car show, luckily the GF was behind me and ran me to the parts store. I'm investing in an exorcist.

 

Even at 15 frames a second can miss it.
Ask me how I know.

 

Just how DO you know? Just kidding!!

I've seen some that have "glitches" in them that are difficult to find with a digital voltmeter, finally used a lab scope (automotive specific).

Moral of the story, there's always a better tool out there.....

 

While retuning my entire fuel curve ( it's now 5 blm lean) I noticed that I still can't get open loop idle to work, or my TCC control. Is there some constant that has to be satisfied for both of them? I can't seem to find anything in the hack. My only other hunch is the VSS is doing the same thing as my TPS. Any ideas?

 

1 step atta time.
On the VSS, hook your scanner up and see if you have an indicated MPH. If not look into why, if you do then look at the TCC qualifiers. Coolant temp, tranny flag, then into the table cals. Oh, and see if you have power at the ecm thru the brake pedal circuit. Then when you've checked everything, and it still doesn't work replace the TCC solenoid.

Might hook a light on the lead off the brake switch to the ecm to also make sure it interupts the circuit.

 

I've been running the tcc off of a switch since I swaped the 700 R4 in a few years ago. I have the wire from the ecm ran to my relay that activates my tcc. So I know everything is up to snuff wire wise. The VSS reads fine other than being 10 mph off. It did throw a couple of vss codes when I first got it up and running with the tbi setup, even though the vss was showing up fine in winaldl. I have messed with the tables and set the temp cutoff lower and nothing gets the tcc flag to light up on the scanner. Even tried loading all the stock asdz paramaters into it. Is it possible that I have the wrong switch set for the optical/magnetic vss? I assumed my monte came with the optical setup, and like I said the vss shows up fine. I don't have the high/low gear switch hooked up to anything, I assumed it would just default to one or the other and I could just use that table to lock up the converter.