The motor idle at 900 after warm up but when the radiator fan kicks on the idle fluctuate from 0 to 1800 about 6 to 7 time before it dies. I'm replace the IACV/ FITV with a new one, checked all vacuum hoses and coolant hoses, coolant is topped off, adjusted the idle screw, and the throttle cable. Nothing help! I'm going mad and about to scrap the project. Someone, anyone Help!!! WHAT IS WRONG WITH MY MOTOR?



My B20 Vtec swap into a OBD2B
hondata ecu
11.5 CR JE pistons with eagle rods
skunk2 pro 1 with pro cam gears.
port polish +1 /+0.5
OEM crank (89 Stroke)
B16 head with Ferrea valves, Retainer, and springs
AEM fuel pressure regulator
440cc injector
ITR intake mani
Tri Y header

 

still cant figure it out. anyone???

 

bump...

 

anybody???

 

did you swap the iacv yet? can you datalog and see what the sensors are doing when this happens. try unplugging anything, your map, tps, o2 to force limp mode if it then runs smooth its likely a sensor or solenoid issue. if in limp the idle is all wacked out chk the throttle stop.

 

Are you getting any diag. codes?

 

fix the problem guys. found out it had a OBD1 TIMING BELT DRIVE PULLEY instead of a OBD2. the crank sensor wasn't reading the timing belt drive pulley right. thanks for the help

 

thanks this helped me to