history. 86 gxl to jdm turbo. blown motor and now its rebuilt. usdm turbo wiring harness fuel pump. other than exhaust and na rotors its stock. i have 7 miles on this motor and something is starting to be wierd...

when cold it doesnt idle but it will revv and drive fine. the warmer it gets the better the idle but the throttle goes away. like if if floor it it will die. a bit warmer and half throttle it dies.. untill its totally warmed up at which point it will die if i give any throttle imput. now if im just sitting in my garage and letting it idle till warm and pull the throttle wide open it will run up to about 3k and fall off then recover then fall then recover. im clueless. im sure its electrical or a sensor but i have no idea where to start.

one more wierd thing. the water temp sensor when pluged in makes the car act like the maf is disconnected.. it will start rev to 3k and die. unplugged the needle shows boiling hot(which i know its not because its been sitting in 30* weather all night) but it runs ok. i didnt notice the above problem till i hooked up the temp sensor wire and disconnected it.

any ideas or help is much appreciated. thanks guys.

 

vac leak?

 

Sounds like some crazy electrical problem.. wish i could be more help, but all i can say is check your voltages and grounds at your ECU. Check the FSM for the different pins and voltages/grounds you should see... then grab your DMM
GOOD LUCK

 

it looks like it was the water temp sensor but i still cant get the gauge to work