so i just swapped my tps sensor for the new one.. calibrated it to 13.7 and 100% at wot.. so i clear the codes.. and take it for a spin and out of no where the light comes back on... so i check it and its a p1400 and a p0121.. now would the bad map sensor cause the tps to throw a low voltage code.. cause im like out of ideas here.. the tps sensor i got is the same one that was on the car the mikuni one.. anyone got any ideas.. thanks.. i gota get this car ready for inspection and this damn code is keeping me back..

 

Could be in your tune and not parts

 

so i figured out the issue.. the whole time it was cause i was running a tial bov vented to the atmosphere.. and that caused cel P1400 and P0121.. i put my stock 9 bov and afta driving it for about 100 miles light went away.. and hasent been back now for a few days ... so i hope this helps anyone thats having the same issue..

 

I have the same issue, but I haven't messed around with any sensors. I put in a Perrin intake system and a Evo 8 MR BOV and I'm getting the P1400. I'm guessing switching back to the stock BOV will remove the P1400 code. What do you think?

 

I went through that issue I while back. On the tial if you go with a spring too heavy you end up with a bov that won't open in time, then with a spring too soft you get erratic idle and p0121.

 

Not trying to bring a dead thread up..but Im having a similar issue. I'm going to start by putting a washer in there at a time and see if it goes away.
The reason Im putting one washer in at a time is so that I dont make it too stiff then the BOV wont open all the way.