So just bought a car, when I test drove it the CEL was on but did not check which codes...(I know should have but forgot)....anyway bought the car and CEL was off.....Maybe 4 days later it popped on when I left work, scanned it and got...

PO121 TPS code, main range

PO243 Wastegate solenoid valve code (running MBC, not sure if stocker is plugged in but assuming so or else it should be on all the time)

PO300 Misfire detected

I noticed it had a slight miss at idle, like a slight popping, once I cleared the code it went back to normal.

The misfire might be because it started snowing and moisture got on the coils or wires since it has no coil cover (for now)..But I dont see why it would stop once I cleared the codes unless it was from one of the other codes?

Is it a coincidence I got these other 2 codes or are they all on the same common ground/power circuit or something? What can I check? and yes I searched

Thanks

 

TPS clip is missing and the plug is moving around is a good place to start on the 0121. 0243 is just because the stock BCS is cut wire/unhooked/not funtioning. 0300 is normal and can be turned off...all of them but the 0121 can be turned off actually.

 

Thanks, will check the tps clip and harness. Can you turn off the 2 settings with evoscan or need something better? Why do you say the misfire code is "normal"?

 

Now I got a PO171 Lean code

 

Codes can be turned off in ECUflash and only reset with Evoscan. P0171 for excessive lean can be a few things. What injectors in the car?

 

They're Precision injectors, the previous owner told me they're 1000cc

But it sets this code just driving around, NO BOOST so it's not from having too small of injector.

The only time my wideband goes extremely lean (off the scale) is when decelerating in gear in gear (normal to me) or when I take it out of gear and at idle rpm it is lean and surges...Once I get down to around 10mph it returns to stoich.

I really need to do a boost leak test, I found the meth injector nozzle fitting loose and I'm sure there are other vacuum leaks that could cause a lean code.

 

If the injectors are set up with the trims off too far it will come up lean and throw the code. Idle and cruise are what determine the 0171, not WOT where you are right you have plenty of fuel.

 

I gotcha, thanks....Its currently tuned by DG in ny but going to take it to Ivey once I build up some more money. The code seems to come on either before or after I start up/shutdown randomly but could just be coincedence...either way the idle above 10mph is lean and making it surge, once it gets to 10ish or below it idles at stoich, assuming that prob has somethin to do with it.