Speed limit issue
#1
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Folks, I'm trying to understand why my car virtually refuses to go above 83mph. from 0 to about 80 its pretty much a rocket, but after that it takes a whole lot more eeffort to get her to 83, and then she just stays there no matter how hard i push her, kickdown and all. She is well maintained, atf change, performance plugs, new ignition wires, k&N filter, Mobil 1 oil, heck the tranny was replaced late last year. I just dont get it. I know shes a bit old (2000 A4Q 2.8L Auto) with 203k miles on her, but i expected to be able to get to at least 90mph. Am i expecting too much or is there somthing amiss? Honestly, the way she ramps up to 80 and then just freezes is wierd. I thought the speed limiter was set to 135.
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..., yes did the trottle adaptation. She will shift at red line, but once i get to that 83mph mark, she wont even rev to redline. she revs to around 3000 and just stays there no matter how much i step on it.
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Yeah, i tried that as well, i downshifted to 4th and stepped on it. No increase in speed. It just hangs there (actually its 85mph on closer inspection). Honestly, i'm beginning to think it might be a speed limiter issue, i wish there was a way i could check the limit using a scan tool. Now guys, the most painfull part of all this, is that my arch rivals, the infamous V6 Camrys are beginning to give me a run for my money. There is this five mile long bridge over water that i take to work every day. Its pretty much a race track on weekends or late at night when there is low traffic (no inforced speed limits in my country). I usually hold off or obliterate most challengers without even having to get to 85mph, but for those that decide to go above 85 (mostly the blasted Camry guys) i have no reply cos the car just hangs on me at that point. Oh the shame of it!
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Decided to take the car for a thorough hard drive, pun not intended
When i tried to push her above 85mph, the MIL began to flash, then stopped flashing and went off when i slowed down. Got home and pulled the following codes
PO431: warm up catalyst bank 2: efficiency below threshold
P0300: Random/multiple cylinder misfire detected
P0304: Cylinder 4 misfire detected
P0333: knock sensor 2 (G22): signal too high
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PO431: warm up catalyst bank 2: efficiency below threshold
P0300: Random/multiple cylinder misfire detected
P0304: Cylinder 4 misfire detected
P0333: knock sensor 2 (G22): signal too high
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BTW, this year i've had two instances where the EPC light came on, and i get the "accelerator position sensor: implausible signal" code. Both times it happened was right after i had the engine steam washed. Both times, the EPC went off after the engine dried off. Dont know if its related to the speed issues i'm currently experiencing.