Rough idle on a 2k1 1MZ-FE

[fubar]

Hi everyone,

I have a 2k1 V6 Camry that has trouble maintaining a steady idle. It doesn't stall, but I when I let off the gas and roll to a stop, I can see the tach bouncing up and down. When I stop, the car idles very low (around 400-500rpms) and shakes.

The diagnostic code says the idle control something is malfunctioning.

Any help would be greatly appreciated.

Thanks everyone!

[Deep]

Idle Air Control Valve?

[88 LE]

^ Most likely.

What happens is that it gets clogged with oil (from crankcase breather).

You can try cleaning it out with carb cleaner / throttle body cleaner. Just make sure the can says that its safe for sensors and stuff.

[fubar]

Thanks everyone!! Problem solved.

It turns out the diagnostic codes don't always tell the entire picture. It was an EGR problem but not directly related to the valve itself. The diagnostic code told me it was an IAC issue.

There was a sticking thingamajiggie [vacuum relay?] underneath the big plastic cover. It hooks up 3 hoses and one runs to the EGR valve. When I unplugged that hose, the hesitation went away shortly, then came back.

I squirted some throttle body cleaner stuff into it. All of the sudden, no more stumbling at idle and hesitation at acceleration.

This place rocks!

[ekpolk]

On the prevention side, what oil are you using? If it's a mineral (or even weak synthetic) that has a particularly low flash point, your engine may be generating more oil vapor than normal, thus speeding the gradual accumulation in the recirc system. It certainly seems that it's a little early for this to be happening to an '01 (unless perhaps it suffers some form of particularly severe service). An oil with a significantly higher flash point, compared to what you're now using, might slow or prevent this problem from happening again.

[fubar]

I'm using 5w30 Mobil 1.

I really don't think it's an oil vapor issue because the hose connects all the way over from the airbox (not from the crankcase or near the throttle body). There's 2 hoses that connect on the clean air side of the filter. This is the smaller one that runs to the engine and the little [vacuum relay?] at the end of that.

[SBCelicaGT]

hmm... my engine idles pretty rough as well. I wonder if my car is experiencing the same problem. Did you spray directly into the vacuum switch?

[bronzemaxell]

my 99 1mz-fe doesn't idle rough when engine is not warmed up,
but after i drove it on highway for a while, i guess the engine should be warmed up, and coming to traffic light, i can feel the car shakes a little sometimes and the RPM has minor flucutation, if i gives a little gas, the rpm won't fluctuate and the car doesn't shake anymore
anyone has any input what the cause is?

[bassthrive]

PCV valve maybe?

[Lauren]

My car seems to idle a little more roughly then I remembered when I got her...my mechanic says that the engine mounts get old and don't asorb the engine idles. As for your EGR prob. I had it too, only mine stayed closed, stalling my car. To keep it clean-once and a while drive your car like you stole it!- Cleans out crap and keeps things open.

[toyman]

Does anyone have good used coils for a v6 1MZFE engine ? I need at least on e for now!

[xxpanipuri]

mine does something similar i have a 2000 le v6 and it started after i cleaned the throttle body.

when the engine is cold and i start the car up its fine.

but once the engine is warm and i start it back up (ie after going to starbucks to get some coffee)

it idles around 400-500 rpm and seems ready to stall....and when i put it into reverse it stalls.....

unless i give it some throttle and then reverse then i'm fine..... otherwise the car runs fine...

[wolfdefender]

where is the idle air control valve located in the car. My 1998 camry is having similar problems

[88 LE]

Its on the bottom of the throttle body. See link below.

http://www.autozone.com/servlet/UiBr...3d8013ebef.jsp

[wolfdefender]

Thank You very much doing it right now.