So my car has been having an issue where the idle would surge in neutral with the clutch out, but would calm down once the clutch was depressed plus there was a P0850 code. Looking around on here, I saw several instances of people having the same issue and it always turned out to be the neutral switch, which makes sense. So I ordered the switch online and reading about how difficult it is to get to, I took it to a local rotary shop to have them put it on.
Well when they lifted the car, they noticed that a couple of wires near the transmission had been severed, likely the wires going to that switch. They spliced them back together and you would think that was the end of the story.
They fired it up and it still did the same thing. They checked the resistance on the switch and it was indeed changing when shifted. Just to be certain, they connected the new sensor and pushed the button in by hand and it made no difference. For the hell of it, they slapped in a factory airbox in place of my aftermarket one and there was a slight improvement, but not much. I have the original and will likely swap it back in when I get a chance.
It got a little worse after leaving the shop. I'm guessing they not only reset the codes but also the PCM as a whole. The car stalled out on me three or four times on the way to work when I pushed in the clutch. I'm guessing it had learned to compensate for something until they reset it. So now it surges in neutral with the clutch engaged and sometimes stalls when the clutch is disengaged. The only codes that reappeared after about an hour of driving are P0171 and P2270 which, if I'm not mistaken, are probably because the car has no catalytic converter.
There were at least three technicians who work on only Mazda rotaries who looked at it and couldn't figure it out, although in their defense they only had the car for about three hours because I needed it to go to work and only planned for a quick sensor change. So I'm turning to you guys.
I ordered an Ultragauge and looking at the tracking, I think it's waiting on my doorstep right now, so if you need any more information that it can provide, let me know. I don't yet know everything it's capable of.
Well when they lifted the car, they noticed that a couple of wires near the transmission had been severed, likely the wires going to that switch. They spliced them back together and you would think that was the end of the story.
They fired it up and it still did the same thing. They checked the resistance on the switch and it was indeed changing when shifted. Just to be certain, they connected the new sensor and pushed the button in by hand and it made no difference. For the hell of it, they slapped in a factory airbox in place of my aftermarket one and there was a slight improvement, but not much. I have the original and will likely swap it back in when I get a chance.
It got a little worse after leaving the shop. I'm guessing they not only reset the codes but also the PCM as a whole. The car stalled out on me three or four times on the way to work when I pushed in the clutch. I'm guessing it had learned to compensate for something until they reset it. So now it surges in neutral with the clutch engaged and sometimes stalls when the clutch is disengaged. The only codes that reappeared after about an hour of driving are P0171 and P2270 which, if I'm not mistaken, are probably because the car has no catalytic converter.
There were at least three technicians who work on only Mazda rotaries who looked at it and couldn't figure it out, although in their defense they only had the car for about three hours because I needed it to go to work and only planned for a quick sensor change. So I'm turning to you guys.
I ordered an Ultragauge and looking at the tracking, I think it's waiting on my doorstep right now, so if you need any more information that it can provide, let me know. I don't yet know everything it's capable of.
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