RPM'S drop to 400-500 after warm-up ? - Toyota Nation Forum : Toyota Car and Truck Forums

JimBowNut · 03-22-2011, 03:23 PM

Hey Guys/Gals,

Just wondered if anybody had the following problem & how they resolved it.

1995 Camry, 4 cylinder...

The car cranks like its brand new when you crank it up in the morning or anytime it hasn't been started in a couple hours. After warm-up, turn the car off and at next start-up the RPM'S drop so low that the engine tries to die (400-500rpms) It takes a moment or two for the RPM'S to adjust.

Can anybody suggest a definite solution ?

jim

***fenixus*** · 03-22-2011, 03:25 PM

have you tried cleaning the TB & IAC?

JimBowNut · 03-22-2011, 03:33 PM

TB yes. Could you tell me what is the IAC ?

***fenixus*** · 03-22-2011, 03:48 PM

Idle Air Control valve. It's mounted under the TB, you probably could see the opening in TB leading to IAC valve. This valve is a sort of air bypass around the throttle plate, completely controlled by ECU electrically. If it's dirty, then idle speed is rough and sometimes shoots high when it should be low or vice versa, depending on how the dirty valve sticks.

might be worth checking and/or cleaning first. common trouble on gen3/4 camry.

other than that, how the car feels when driving? any maintenance history? any tune up done?

JimBowNut · 03-22-2011, 04:11 PM

Yeah...I did spray some carb cleaner back there, but i may need to re-visit that as i ran out during job.

Car fells great when driving...could have a little better mpg...Has 260k on it...Had new distributor 10k ago...new plugs & wires then just because...(I may get buddy to check timing). Can the IAC be removed and cleaned to any good effect ?

Mike Gerber · 03-22-2011, 05:24 PM

"Can the IAC be removed and cleaned to any good effect ?"

Yes it can, but I would first try spraying throttle body cleaner liberally down in to the port in the base of the throttle body that leads to the idle air control valve. That usually cures the problem. If it doesn't, then you can go to removing the idle air control valve for further cleaning. Here's a good DIY on the cleaning process for the 4 cylinder 5SFE engine.

How to: Cleaning Throttle Body -4 Cylinder Engines- With Pictures

Mike

***fenixus*** · 03-22-2011, 06:27 PM

follow the above basic DIY on cleaning TB & IAC with Sea Foam Deep Creep and a toothbrush.

if you suspect the IAC to be faulty, you can remove the whole TB and then unbolt IAC from it and clean thoroughly:
5sfe IAC Removal (lots of pictures)

xpeed · 03-22-2011, 07:57 PM

IAC most likely. Just clean it or if you want to be safe, get a new one.

JimBowNut · 03-22-2011, 08:04 PM

Thanks to all you who have responded !

All those links have helped a lot !

Jim

***JohnGD*** · 03-22-2011, 08:07 PM

Removing and disassembling the IAC usually yields better results. The carbon on the bottom of the rotary valve is hard to clean off. Check this DIY too:

DIY removal & cleaning of IAC

If the IAC doesn't improve it then check the engine coolant temperature sensor as well. It's the 2-wire thing on the water outlet pipe.

Quote:

Originally Posted by JimBowNut

Hey Guys/Gals,

Just wondered if anybody had the following problem & how they resolved it.

1995 Camry, 4 cylinder...

The car cranks like its brand new when you crank it up in the morning or anytime it hasn't been started in a couple hours. After warm-up, turn the car off and at next start-up the RPM'S drop so low that the engine tries to die (400-500rpms) It takes a moment or two for the RPM'S to adjust.

Can anybody suggest a definite solution ?

jim

JimBowNut · 03-28-2011, 03:13 PM

GOT'ER DONE !!! Thank You ALL for all the help !!! That Thing was crusted w creosote [it looked like]. looked like the inside of my wood burning stove !

***fenixus*** · 03-28-2011, 03:23 PM

so what is your idle speed now at?

Mike Gerber · 03-28-2011, 08:27 PM

Quote:

Originally Posted by JimBowNut

GOT'ER DONE !!! Thank You ALL for all the help !!! That Thing was crusted w creosote [it looked like]. looked like the inside of my wood burning stove !

Which method did you use; the on the car or the off the car method?

Mike

***fenixus*** · 03-28-2011, 08:29 PM

he posted in this thread, so I believe he did it off car

http://www.toyotanation.com/forum/sh....php?p=3519877

wondering what the results are, I will be doing same thing to wife's car in a few weeks

Quote:

Originally Posted by Mike Gerber

Which method did you use; the on the car or the off the car method?

Mike