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fast idle thermo valve

 
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Old 11-20-2015, 01:40 AM
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fast idle thermo valve

I know there is a lot of threads on surging idle, however i know that i have a problem with my fitv. I bled the cooling system, took off the valve and clean it, then bled the cooling system again and still have a surging idle when warm. It's so frustrating! I looked for a replacement and cant find any at all.
Is this a common problem with then 3rd gens because i haven't seen anyone post on an actual failure on this part?
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Old 11-20-2015, 08:47 AM
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Re: fast idle thermo valve

All I did was remove the screws and turn the notch with a screwdriver clockwise like others have. Surging is more likely a Idle air control valve which don't last long.Cleaning the carbonized screen on the I.A.C.V. Sometimes fixes it and sometimes not.
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Old 11-20-2015, 11:19 AM
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Re: fast idle thermo valve

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Originally Posted by Bellatrix View Post
I know there is a lot of threads on surging idle, however i know that i have a problem with my fitv.
I'm going to ask you a few questions. Don't take offense to these. I'm asking these questions because we have no way of knowing your level of experience.

How do you know you have a problem with your FIV?

Have you done any other troubleshooting for this problem?

Which engine do you have in your lude?

Does it have an auto or manual gearbox?

Does it have working AC?

Have you checked to see if there are any stored trouble codes?

Can you describe how you bled your coolant? Some people seem to have difficulty doing this and getting enough air out of the cooling system.
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Old 11-20-2015, 06:40 PM
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Re: fast idle thermo valve

If it's your iacv then your idle will dip when u turn on accessories and the power steering. Turn on rear defrost, heat, lights etc.. If your idle dips always then u found the culprit
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Old 11-20-2015, 10:31 PM
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Re: fast idle thermo valve

I bled the cooling system by first using the bleeder by the thermostat and closing is when coolant started to flow out and then i ran the car at 2000 rpm with the radiator cap off taping it off until the radiator fans turned on three times just to be sure all the air was out. I have physically checked when the engine is warm that the valve isn't closing. I have to drive the car for nearly a half hour before my idle finally gets back to normal.
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Old 11-20-2015, 10:37 PM
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Re: fast idle thermo valve

I have also unplugged the iacv and the surging continues. I however wouldn't be surprised if I have a problem with iacv also according to what static said about the dipping idle, however I already cleaned the iacv and checked for any vacuum leaks with starting fluid.
I have the b20a5 installed still with a manual trans. The A/C works and I have not engine light on. In addition I just failed emission :/ because of nox levels.
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Old 11-22-2015, 09:45 AM
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Re: fast idle thermo valve

I failed the Nox 5 years in a row. My stupid egr solenoid never worked so I just loosened the distributor and retarded it as far as I could.It brought all the other numbers up but as long as I passed emissions. The new cat converter didn't help even running it for an hour. Like I said before, Sometimes cleaning the iacv works and sometimes it doesn't..

Last edited by Lespaul59; 11-22-2015 at 09:52 AM.
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Old 11-22-2015, 07:58 PM
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Re: fast idle thermo valve

Thanks Les. I am going to try to clean the EGR with some carb cleaner and may do like you said and retard the ignition timing. Then on tuesday I am going to try to pick a iacv and fitv.
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Old 11-22-2015, 08:09 PM
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Re: fast idle thermo valve

Thanks!
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Old 11-23-2015, 06:21 PM
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Re: fast idle thermo valve

Quote:
Originally Posted by Lespaul59 View Post
I failed the Nox 5 years in a row. My stupid egr solenoid never worked so I just loosened the distributor and retarded it as far as I could.It brought all the other numbers up but as long as I passed emissions. The new cat converter didn't help even running it for an hour. Like I said before, Sometimes cleaning the iacv works and sometimes it doesn't..
That's because the catastrophic converter deals with HC and CO, not NOx. Some large diesels have NOx traps, but not gasoline cars.


For the bouncy idle, just turn in the FIV 1/2 turn, this always cures the symptoms.
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Old 12-15-2015, 08:08 AM
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Re: fast idle thermo valve

Hey man I really understand your frustration I had the same issue about 3 months ago. But I tryed ever single valve and had coolant in the system and everything. But I finally got it It had been a intake manifold gasket that was intaking air maybe you should try it if you handy.
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