RPM

1994 TOYOTA COROLLA
176,535 MILES
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KAIKIING
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May I know is that normal for my car when start up the RPM is going up slowly from 0 to 1000rpm no matter early in the morning or daytime?I've found that other car when start up the rpm will go up quite fast like a speeding then drop back to around 1000rpm.If that is not normal then what might be the problem of it?Please advice.
Oct 6, 2011 at 11:45 AM
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JACOBANDNICKOLAS
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When the engine starts, it should go quickly to idle. You could have issues with the idle air control valve, a vacuum leak... If the check engine light is on, have the computer scanned to identify trouble codes. Most parts stores will do it for free.
Oct 6, 2011 at 11:51 AM
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KAIKIING
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My car cannot scan with scan tools.Only can use check engine light and get error code 32 relate to MAPP sensor.I've change the MAP sensor but seen no much changes with it.Already clean the IAC valve and also the throttle body.But still with same result.Should i change the whole throttle body?
Oct 6, 2011 at 11:57 AM
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JACOBANDNICKOLAS
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No, I don't feel that will help. Have you checked for vacuum leaks?
Oct 6, 2011 at 12:14 PM
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KAIKIING
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most of the vacuum tube I've change with new one cause dont have idea how to really check for the leaking.The engine not really idle too when the air-con is on most of the time but sometimes it's idle.
Oct 6, 2011 at 12:22 PM
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JACOBANDNICKOLAS
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Go to our homepage under the DIY section for directions on how to check for vacuum leaks. Check around the intake as well as hoses.
Oct 6, 2011 at 1:21 PM
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KAIKIING
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Can you please give me the link?Thanks
Oct 6, 2011 at 1:45 PM
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JACOBANDNICKOLAS
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Here is the one they have. I will check because there is a much more involved process. I know it was written because I wrote it.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Oct 6, 2011 at 6:00 PM
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