Thread: Driveability issues

Tweet

The O2 sensor is not in the primary tube, it is in the collector 1 1/2 inch from where the 4 pipes come together. FAST is the one saying the O2 sensor is too close to the 4 tubes but unless I completely remake the headers which are from Sanderson, the O2 sensor is where it has to be. The slip joint is leaking and it is less than 2 inches from the O2 sensor. I'm thinking of getting some header wrap and putting it around the joint to test the theory of the leak downstream of the O2 sensor. I remapped the computer today and it is better but the system just doesn't seem to be learning like it should. A quick check at the exhaust showed a 16:1 AFM and so I changed it back to about 14:1. I'm using a MSD distributor and MSD box to brighten the fire, I'm on my second box. The plugs have been changed, regapped and I corrected the timing to about 10 degrees at idle. The timing was way off, have no idea how the builder could have done that, that bad. I'm almost there engine wise after today's tuning. My biggest problem now is the damn transmission won't down shift soon enough lugging the engine, not to mention that it upshifts at 5KRPM at WOT. It also won't stay in a gear I've selected for it. For example if I place the lever in low, it will shift up three gears. At least I can keep it out of 4th which presents the biggest problems. As long as the engine is purring along at or above 2K RPM, it runs nice. Anything below that and it surges, even at 40 mph in 4th. With the car sitting still, in neutral or park, blipping the throttle to 4 or 5K rpm the engine sounds awesome, no miss firing.