So i did a Ls-vtec conversion over the summer, after completion i started the car up and it ran mint with a chipped P75 ecu that was on the car when it was non-vtec. I just let the car idle and check for any sign of leak or anything and everything look good.

Since then the car sit the way it is, never driven or anything. I bought a P28 and had a new basemap burn since i switch from 550cc to 750cc injector and bigger turbo etc...

Now when i start the car up, it idle at about 500-600 rpm and run really rough (engine shaking) mostly likely because of low rpm.

I dont understand why it would thrown these code now when it was running completely perfect with the P75, is it because of the ECU?

I cant change back to the P75 to see how it run since the map on the P75 is for 550cc and i now have 750cc.

BTW,
Code 6= ECT, Water temperature sensor
Code 10= IAT, Intake air temperature sensor

 

this happens a lot. check IAT wire color.. look for green and red. If you ever fired the car with those sensor in the wrong place it can blow a chip in the ecu. That happen to me. It might be throwing other codes also because the chip is blown.

you can take out the IAT sensor and look at the tip of the sensor... If the tip is bust up, than that might be the problem.

 

The IAT code is what causing the car to run rough correct? i dont see how i could of plugged it in the wrong place, i never removed it to begin with.

 

no, the code has nothing to do with the car running bad. But if the sensor was ever plugged in the wrong spot at any time then the IAT sensor is pretty much blown. Just go check the IAT sensor and look at the tip, if it still good and then I have no idea.