JohnnyB70

Ok, I'm having the ever so popular idle surging when my engine is warm. I have done all the protocols for the symptom and have not found the cure yet! However, I have one question to those of you who have adjusted the screw on the FITV (fast Idle thermo valve). Logic tells me that once the car reaches normal temp the FITV closes the valve and you should not get any suction off the lower hole in the TB. I tightened the screw in the FITV and bled the coolant. Once my car reached normal temp, I took intake off and checked suction on the lower hole again and I still have a slight suction, its not as bad as prior to tightening the screw. Is this normal to have minor suction here, I just don't wanna by a new FITV from the stealership for 80.00 bucks to find out that its not the prob.

Jimmy

iTrader: (5)

If i were you:

I would search archived topics for FITV,IACV.

I'll be nice and go ahead and help you..

I had the same problems on my d16z6.
I removed the fitv and disassembled it cleaned it with brake cleaner and tightened the screw down. Plugged everything back up and still i have a surging idle.

Step 2:
I started to car without the raditator cap to get all of the bubbles out of the coolant if there were any.

Step 3: I turned to the haynes manual because after doing all of these DIY thing and no fix... I noticed how to reset the idle.
I adjusted my idle screw to spec and reset it.. and problem resolved.

Step 4 (how to reset idle):
Turn your engine off and adjust your idle screw on the throttle body.. If you don't know what your doing or are not mechanically inclined i do not reccomend doing this.
After you have adjusted your idle screw your going to need to pull the (Number - 7 ''back up fuse'' In the engine bay fuse box'') Pull the fuse for 45-60 seconds and start your car.

Goodluck and pm me if you have any questions

JohnnyB70

Thanks for being nice... But thats what "protocol" means.. been there done that.... Just wanted to see if someone else who made the fix to their FITV and corrected the Idle could tell me if the lower hole on the TB still has a slight amount of suction so I could determine if my FITV is in need of replacement.

bbarbulo

logically, it's NOT likely that it needs to have any suction when it's closed, cuz it's only supposed to work when the car is cold. that being said I don't know and I can't check cuz my car doesn't run right now.

what I'm wondering, is if I was to remove that FITV and make a blockoff plate for the whole thing at the throttle body... will that totally elimiate the high-idle function. Cuz that would be great!!!

93CX

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bbarbulo &raquo;</TD></TR><TR><TD CLASS="quote">
what I'm wondering, is if I was to remove that FITV and make a blockoff plate for the whole thing at the throttle body... will that totally elimiate the high-idle function. Cuz that would be great!!!</TD></TR></TABLE>

i'm interested in that as well..

Jimmy

iTrader: (5)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93CX &raquo;</TD></TR><TR><TD CLASS="quote">

i'm interested in that as well..</TD></TR></TABLE>

Yep, several people block off there FITV.
Only downside to doing this is your engine takes longer to warm up.
It's been done before though.

JohnnyB70

So anyone else know if they have suction on the fitv opening in the tb when the engine is warm???

EE_Chris

When the coolant gets hot, it expands the wax pellet in the FITV to SEAL OFF the air passage it once provided to the intake manifold.

JeffS

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">When the coolant gets hot, it expands the wax pellet in the FITV to SEAL OFF the air passage it once provided to the intake manifold.</TD></TR></TABLE>

I think you're stating the obvious.

I can't give you a 100% answer either since the only time I've paid attention is when I was diagnosing a bad one. One question though... when you put your finger over the FITV hole, does the idle stabilize? If so, then yes, you need to replace it. If not, then you've got a different problem.

EE_Chris

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JeffS &raquo;</TD></TR><TR><TD CLASS="quote">I think you're stating the obvious.</TD></TR></TABLE>

Not so obvious to the original poster if he is asking the question.

As it should have been implied from my post, if there is suction through this hole when the motor is fully warmed up, either 'fix' it or replace it.

JohnnyB70

well see thats my problem. I only have the surging issue after I have been driving and then need to stop for a stop sign or signal light. I cant simulate the surging just sitting in the garage and reving the engine so not sure that putting my finger over the FITV hole in the TB changes anything. I guess I could take my intake off let the car warm up good and then drive it around the block and try covering the hole when I stop if its still surging after I hop out and get the hood up..... Cause the surging can last between a couple seconds to a approx a min or 2. I will try it today and see what I find out.

suspendedHatch

The answer is pretty obvious. If you decide you want a used FITV, I got one maybe two of them.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">what I'm wondering, is if I was to remove that FITV and make a blockoff plate for the whole thing at the throttle body... will that totally elimiate the high-idle function. Cuz that would be great!!!</TD></TR></TABLE>

That's what I did and why I did it. It also increased gas mileage measureably and power theoretically. Not recommended for freezing climates though.