Adjust Idle to 750 rpm - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 10-15-2012, 02:15 PM
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Adjust Idle to 750 rpm

I noticed my idle frequently drops below 750 rpm and then the car feels "rough".

Is there a way I can adjust the idle. I just recently changed my ECM and was taking it easy so it could reprogram to my style of driving.
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#2 Old 10-15-2012, 02:29 PM
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Sounds like you have a vakuumkeak. Check your vakuum hoses for cracks.
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#3 Old 10-15-2012, 05:30 PM
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There is no idle adjustment on these cars. If you still have the problem after a few days of driving (as the ECU relearns) try cleanng out the throttle body. There are good threads here with pictures that will show you how to do it. Search "Throttle Body Cleaning" on this forum and choose the one for the engine in your car.

Mike
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#4 Old 10-15-2012, 09:00 PM
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Was it not doing that before the ECU change? Did you change anything else while you were at it? Like Mike Gerber said, hot idle rpm is controlled by ECU and is non-adjustable (cold idle IS adjustable on the TB).

I have a similar problem, if you can call it that: the car idles at 680-700 in Park/Neutral, and drops to 640-650 in gear. Toyota states your idle RPM should be 750+/-50, so technically 700 is still ok.
In my case, I cleaned throttle body to no effect, cleaned EGR and replaced EGR modulator, Seafoamed the engine. None had any effect.
Then I changed my engine mounts with OEM units, and vibration became barely noticeable, and only when in gear. This was the best "fix" for the vibration issue.
I also changed my thermostat w/ OEM one, and this helped somewhat, as before the car could drop to 610-625 rpm while in gear.

The only other thing I would try is to check the engine coolant temp (ECT) sensor.

Hope this helps.
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#5 Old 10-15-2012, 09:08 PM
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I'd also check the throttle position sensor, to see if it's reading in spec.
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#6 Old 10-16-2012, 10:53 AM
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Rough Idle

Thank you for the hints. I detected the rough idle earlier but had to deal with the ECU first. The idle is better after changing the ECU but I still noticed that the RPM occasionally dropped and the car felt rough at that time. I now see I must addess this.
I'm not familiar with the idle position sensor but I'll take it one step at a time and clean it first. From what I've seen, unlike the older carb type engines, this is cleaned while the car is cold.
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#7 Old 11-30-2012, 08:15 PM
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My 95 Camry went to low 750 rpm idle after fixing vacuum leaks. It was too rough and shaky, plus the oil light flickered when the pressure dropped below 4psi. The way I got the idle up was to fool the computer by soldering a 500ohm 1/8watt resistor in series with the coolant temp sensor wiring. This got the hot idle up to 1000rpm to idle smoothly and give me 10psi oil pressure. the ECT is a thermistor which goes from about 2Kohms (cold) to about 200ohms (hot). Adding the resistor brings the hot resistance up to 700-900Kohms which will bring your idle up. You can try different resistors to suit your needs but don't go too high. If the computer sees an open ckt or plug disconnected it defaults back to the 750RPM hot idle.
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#8 Old 12-01-2012, 02:50 AM
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Multiple problems

Thank you for the hints.
The problem turned out to be a bad O2 sensor (engine), fuel pressure regulator and spark plug #6. Fortunately all of those parts are easily accessible. After changing those parts the RPM holds steady at 750 and it runs very smoothly. I've been complimented by several people at how quietly it runs.

Adrian
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#9 Old 12-01-2012, 05:15 AM
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Adrian,
Were there any codes for the bad O2? Or was it found via process of elimination? Was it just a old lazy O2 sensor?

02 Camry XLE 2AZ-FE 332k M1 HM 5w30
99 Avalon 95k PP 5w30
13 Malibu 16k PP 5w20
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#10 Old 12-04-2012, 02:35 PM
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Several Repairs

To identify this I sought help from my mechanic. They ID the bad O2 sensor and changed it. They then recommended the other parts that I changed myself.
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