onefast87 Posted October 3, 2007 Share Posted October 3, 2007 hey guys, i bought a TPS from a 240sx and it has the stock 3 wire plug, with another plug comming off of it. im also getting really weird readings in megatune. its giving me numbers in the 1000's, and when driving, my TPS gauge gets pegged and keep going up until i let off completely. does anyone have a diagram on how to install this thing. Quote Link to comment Share on other sites More sharing options...
midnightzxt Posted October 3, 2007 Share Posted October 3, 2007 You're connected to the wrong plug. One is a switch like stock and the other is variable, you're connected to the switch type and you need to be connected to the variable plug when connected to MS. I'll take a picture of mine if I can later tonight or tomorrow. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted October 3, 2007 Share Posted October 3, 2007 The one that looks like the stock 280zx TPS connector is the switch type. The pigtail is the potentiometer(variable resistor) that should be connected to MS. The wiring color codes are in the install sticky. Quote Link to comment Share on other sites More sharing options...
onefast87 Posted October 4, 2007 Author Share Posted October 4, 2007 i have the tps all wired in and was working perfectly in megatune. now my car has become undriveable. all it does is sputter and rev up slowly, it makes 8 PSI before even 2500rpm. i dont get it.can anyone elaborate on this? also when reving the accell and decel flash on and off.my car runs great idling, it revs up smoothly, but once under load it becomes not driveable. someone please help me Quote Link to comment Share on other sites More sharing options...
naviathan Posted October 4, 2007 Share Posted October 4, 2007 Sounds like you have some more tuning to do. I've had many problems with my 240SX TPS. It never stays calibrated. The readings constantly float at both ends like it's moving when it's not. Sitting at idle it will creep up slowly in resistance. I don't know what the deal is. My MS works great on the stim, but I've been through 3 240SX TPS sensors and they all do the same thing. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted October 4, 2007 Share Posted October 4, 2007 If it spools the turbo too early, wouldn't that be a sign of not enough ignition advance? Not sure what ignition setup you are running but I would check that out. Quote Link to comment Share on other sites More sharing options...
onefast87 Posted October 4, 2007 Author Share Posted October 4, 2007 my setup is an 87 300zx Turbo MSII V3.0 +4 bar stock 260cc injectors im using the cas sensor from an 87 300zx heres a pic of my spark map. after alot of messing around i managed to get the car going better then ever, only im having a major glitch between 2200 and 2500rpm,i think im having problems with the Accel wizard. ill report back after some more messing around Quote Link to comment Share on other sites More sharing options...
mobythevan Posted October 5, 2007 Share Posted October 5, 2007 I hate to ask obvious questions, but did you ckeck with a timing light to verify timing matches the table? If so then you should be OK. Quote Link to comment Share on other sites More sharing options...
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