Thread: Horrible Idle (another thread for the archives...)

Situation. Cannot get the car to idle at all w/o holding the throttle down and keeping it at around 1500. Until the car warms up to about 180 degrees, the idle is horrible.

I have been dealing with the idle problem since i got the car back from the mechanic, but not at this level.

A few nights ago I parked in a seedy part of town. Lazy to lock it up I pulled the fuel pump fuse. 3 hours later I came back to start the car. I completely forgot I pulled the fuse. I thought because I was almost on E that I ran out of gas and the guage was misreading. I tried to start the car about 20 times, sometimes it would try to catch, others it wouldn't. At around 21, I realized I pulled the fuse.
Start it up, fill it up with gas and now the cold idle is like a seasaw.
I bought a cheap Professional Products Fuel Guage. Fuel pressure reads under 40psi. Revving it out the guage goes down. in ACC it does not hold pressure. What else can I check?
Trying to make sure all the sensors and wires are in tach for a new motor.

you got a ve dont ya? our iacv's seem notorious for not workin right..

Just a regular DE

Start by setting the base idle as shown in the FSM, then check all your hoses. Cold idle issues are sometimes the IACV aux air regulator.

That seems like you found the problem right there? You've got fuel delivery issues.

Idle air control valve on the intake manifold is stuck open.Spring & screw controlled.Just an idea.....

I have a spare FPR sitting around here somewhere. I am going to try that as soon as the rain stops. But why does it "fix itself" once the car is warm?

Thats my next move. BTW, I did start this in hopes of helping someone else. So follow my journey. Someone in say 2012 or 2013 will appreciate this thread.

Been thru a new one that is now 2 years old and a used one.

Pulled codes from JWT ECU
01 slow 01 fast
03 slow 04 fast
Crank Position Sensor and Knock Sensor.
I always had the knock sensor
Would the crank position sensor cause these problems?
And where is the Crank Position Sensor on a 1991 NX?