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3rd & 4th Generation (19921996 & 19972001) Toyota Camry Discussion for years: 1992-1996 & 1997-2001 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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Old 01-07-2013, 11:12 AM   #1 (permalink)
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Fast Idle Speed on V6 Camry

I have fast idle speed issue with my 300K miles 1994 V6 1MZ-FE engine. Idle speeds showed 2000 RPM at when cold and 1250 when warmed up. Normal RPM should be 700. I sprayed choke cleaner to check for vacuum leaks on every vacuum tubings, on throtle valve body, intake manifold, PCV (replaced), and air filter assembly but could not find any leaks as indicated by RPM not changing. I disconnected electrical plugs connection to IAC, throtle position sensor, temperature sensor and Mass Air Flow sensor to look for RPM changes. They all worked fine. I even replaced with another throtle valve assembly and MAF that I removed from another Camry from junkyard. But none of these corrected the high idle speed problem. I've already spent three days working on this issue and don't know what else to do next. I would appreciate if you guys can suggest what else to look for. Please help. Thanks.
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Old 01-11-2013, 01:12 PM   #2 (permalink)
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Does anyone know what to do? Thanks.
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Old 01-11-2013, 03:06 PM   #3 (permalink)
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Have you tried cleaning the IAC yet? I would also check to see it there is enough slack in the throttle cable to let it return.

Good luck.
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Old 01-14-2013, 12:01 AM   #4 (permalink)
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I have a 1MZ on a 96 Avalon, I too witness 2krpm cold idles. 32F and below. If it is REALLY cold like picking around 10F, it will start around 1.5k and ramp up to nearly 2krpm.

I was digging around a bit, and some 1mZ camry dudes mention they also have 2krpm cold idles, but the majority seem to rest at 1.5krpm.

Though sometimes when my car heats up -the temp gauge hangs in the middle, but just got there, like a 5-8 minute trip at 20F, it will idle at 1krpm in park. But the car appears to run fine. If I run longer, like 15 minutes I'll be idling at 700. It sounds similar to your situation but given time it corrects to a normal rpm.

Thought I'd chime in to let you know you're not alone, and to sub to the thread.

If that's normal, thats cool. Otherwise I don't think 2000 rpm with ice cold oil is the best thing ever.
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Old 01-14-2013, 05:12 AM   #5 (permalink)
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I have 2 1MZs a 94 and a 95. The 94 only goes up to 1800 and settles into a 750 rpm idle. The 95 goes up to 2000 and settles into a 700 rpm idle. I'm guessing both are acceptable. The idle on both begins come down lower after just a few minutes of warm up time.
Both have had their IACs cleaned out. And although I havent done so myself, there is some adjustment to be made on the IAC.

Good luck.
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Old 01-14-2013, 11:02 AM   #6 (permalink)
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High idle speed.

Thanks everyone for the reply. There is enough slack on the throttle cable so that's not the problem. I will clean out the IAC valve next as suggested. Meanwhile, I managed to reduce RPM from 1200 to 800 after engine is warmed up by disconnecting the rubber hose between the IAC valve and plugging off the vacuum between the "airpipe" to front and rear intake manifolds. It seems like a temporary fix but don't know why this works. I have a picture, but don't know how to post it. Sorry.
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Old 01-14-2013, 01:21 PM   #7 (permalink)
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Old 01-26-2013, 10:42 AM   #8 (permalink)
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Update:

I was cleanig the IAC today by spraying carb cleaner into the opening in the trottle body using a straw on the spray can. I know it's not as effectife as actually removing the IAC from the throttle body but it's cold outside!!
Anyhooo, as I was spraying into the throttle body I wondered how well it was actually cleaning and if the rotor was turning freely. I considered running power to the Iac motor to exercise it while spraying but it was too cold outside and too much involved to run cables to it.
I wound up just removing the 2 philips screws and letting the IAC motor hang from the connector wires. With the shaft exposed I could spray the cleaner while turning the shaft back and forth by hand through the range of motion. It turned out to move very freely and I could actually feel the resistance of the spring on the other side of the IAC shaft.

Well to make a long story a little longer ... while putting the IAC motor back onto the throttle body I noticed that the two screw holes were elongated to allow for some adjustment. Then came the Oh $hit moment when I realized that I didnt mark the original position because I didnt know it was ajustable. I wound up installing it back on the car leaving the 2 philips screws loose enough to allow for rotation of the IAC motor.

I started the car and to to my surprise I could change the cold idle speed a great deal by rotating the IAC motor CW and CCW!! This was quite a revelation to me because I always believed that cold idle RPM was fixed!
I woud up setting the cold idle at 1600 RPMs with an outside air temp of 19 F.

I will follow up on driveability and warm idle speed but for now it seems like a feasible option for those who are concerned with higher cold idle RPMs.

Was anyone else aware of this capability, and will I freak out my ECU by changing the original IAC motor setting?
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