D15b7 engine....just finished up a cleaning on the IACV, FITV, and the throttle body.

Problem still exists the same as before which is almost always after start up, the idle will start fluctuating between 2 and 3k rpm....it will stop once I either start driving, the car warms up, or if I let the clutch out a little.

I'm looking for advice on what to check next.

Thanks for reading. - jefé

 

Does covering the FITV or IACV port in the throttle body prevent the fluctuating idle?

 

vaccuum leak...

 

Yeah could be a vac leak or the valve could be bad cleaning it doesn't always make it work again. I would check for a vac leak first as it will be a cheaper fix.

 

Haven't tried that...so I would take the air intake pipe off the throttle body and then plug one of those 2 holes up, right?

If one of those cures the idle problem, then I take it either the IACV or FITV is bad and needs to be replaced?

 

Ok. Thanks.

Best way to track down a vac leak?

 

 

Before messing with that, do what RonJ suggested first.

Check your coolant level as well. Is the radiator itself full? Have you bled the cooling system since disconnecting the IAC and FIT valve coolant lines?

 

No, I haven't bled the cooling system since disconnecting those hoses.

Gonna try some of this stuff in the a.m. and will report back.

Thanks for the help.

 

Ok. Tested the 2 holes in the throttle body.

Covered up the bottom one and the fluctuating idle immediately stopped and the idle dropped down to what feels like what a normal idle would be. It's been so long since I've heard a normal idle. I'm assuming the bottom hole is for the FITV.

Covered up the top one which also stops the fluctuating idle but the idle remains running high.

So, FITV bad? Or should I take that metal cover off the FITV and adjust the screw inside it one way or another?

 

Click the FITV link in my signature.

 

I already gave it a good cleaning to try and solve the problem a few days ago with no change. Same with the IACV and throttle body.

At start up, it's idling around 3k before it starts fluctuating. Should I try adjusting the FITV?

 

Definitely -- Cleaning and adjusting the FITV go hand in hand.

 

Adjusted FITV this morning. Idle fluctuation gone. Sits around 2k before slowly dropping as it warms up.

Maybe that's a bit on the high side, but it's the best I've had in a long time.

Thanks for all the help.