Hi guys,
So here's the deal, I got my ideas of whats going on just need some other opinions or confirmation, since the car is still under an extended warranty it will be covered with 100 bucks outta my pocket. Here's the symptoms, at around 40-42 mph when the car shifts into od the rpm's surge 200-400 rpm's briefly, it also does this at 60-65mph but only briefly then it evens out, I did the brake switch test on the tcc by holding 50-55mph and pressing the brake only enough to engage the switch and disengage the tcc and it seems to be working the rpm's will increase 2-300 as soon as the brake switch is engaged. So what I'm thinking is that briefly the tcc goes hunting and then finally does its job, It has been doing this for about 4 days now and I have absolutely no codes being thrown. I changed plugs and wires to eliminate the chance of it being a misfire, I also noticed my tires looked low turns out all 4 where under 20psi so I aired them all to 35 the problem is still there. I figured the low tires could have been creating drag thus throwing off the tcc. Am I on the right track? Also the car does have a ZZPerformance 1.0 pcm and this issue seems to have come once the pcm was installed could this be the issue? I don't have my old pcm anymore so I can't just change them out to see. I do have a 01 GT parts car I could pull the pcm from if it will just plug up and work? Thanks for any input.
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