Time to do some data logging, see what fuel trims are doing, and what the PCM thinks is going on.

 

I've been reading about the ADS circuit in computer controlled vehicles recently and it seems to be a ghost in the machine. Supposedly, it can cause all sorts-o start/run/idle problems. However, the failure rate seems fairly low. Swap around your ASD relay with another identical one in your power module under the hood. What's the difference from the scanner when you first start her up as opposed to after the vroom maneuver? O2 readings, fuel trims, intake air temp, RPM, engine load, timing...before you touch the gas...are you in open loop for the first 30-45 seconds? And then a complete set o' readings after.

 

 

If you start the pickup and it's been sitting for, say, several hours or overnight AND...you start it up n your first readings are closed loop, not open loop? The third n fourth wires on your O2 sensors are for O2 heaters that are controlled by the ECM. It's supposed to start out in open loop, a fixed mixture. When the temp of the O2's is up to ECM standard, THEN the ECM goes into closed loop, not before. Go back n take a long look at the open/closed loop readings from a cold start. This could/may be your problem, maybe bad heater circuit on the O2s...dirty connectors, bad wiring, that kinda thing.

 

 

hook it back up n find out

 

 

A picture would be nice, but I'm guessin' something around 12-16 gauge.

 

Does anyone know what the two grounds on the back of the heads go to? Both are broke off but everything is working?