JDM-Civic-Coupe

when i turn my car on and it isn't at normal water temp, it idles at 1400-1600 back and forth rapidly. until it is fully warmed up and the intake will stop sucking in rapidly and go down to normal idle, then when i start out in 1st gear and all gears, when it hits that 1400-1600 rpms it will do the same thing till i pass, but it normally makes my car burnout when it does that.so i have to ride the clutch over 1600 rpms to start out. it is on a 1993 JDM d15b vtec with 1992 vx wiring harness. in a eg hatch with P28 hooked up.
thanks in advance'
-Chris

ChrisMonsod

idle air control valve maybe? try swaping it from you old motor.. worth a shot

Josh

sounds like idle air control valve, take if off and shoot it with some brakleen, let it dry and put it back on and see what happens

JDM-Civic-Coupe

the idle air control valve is the eacv not the fast idle valve correct?here is a pic..

JDM-Civic-Coupe

eacv or fast idle valve.

nuc79

EACV up to 1992 = IACV after 1992

same part, same function. I guess before 1992, it sounded impressive to refer to an engine part as "electronic" hahah...

Honestly tho, i'd try cutting/removing the J1 jumper in the ecu and letting the car run off the stock program if the IACV doesn't help.

I don't trust those "JUN" race chips....

Also, make sure all the air has been bled out of the coolant. It has been known to cause this problem too.

Philly Blunt

what do you mean cut the J1 jumper? disconnect my chip?

nuc79

Exactly what I mean.

It takes like 5 seconds with a hot soldering iron to reconnect the jumper.

Plus you'll find out now much nicer it is to run your *STOCK* D15B on a stock P28 program, without spewing raw gas out the tailpipe and fouling plugs.

Hint: Race chips are for Race engines...

JDM-Civic-Coupe

o. maybe i will. i donno.ok.i will