Prado idle RPM at Drive and Park

Submitted: Tuesday, Sep 09, 2003 at 23:26
ThreadID: 7142 Views:3379 Replies:2 FollowUps:1
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I've bought a 2001 Toyota Prado (3.4L V6 Petrol). I noticed that when the engine is hot and when the auto transmission is at "P", the idle RPM stays at around 750 stably. But when I move the transmission to "D", still stopped, the idle goes to 650 or so. This happens regardless of whether the A/C is on. Can any prado owner tell me if this is normal?

Thanks in advance.
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Reply By: Frank - Wednesday, Sep 10, 2003 at 02:03

Wednesday, Sep 10, 2003 at 02:03
Mike,
If you have a look in the workshop manual, most automatics (4wd or cars) have a higher idle speed than manual ones, about 100-150rpm. Most workshop manuals state that autos need to be in drive with the handbrake fully engaged, to adjust the idle. The idle speed then increases when the car is placed in park or neutral.
The idle drops by about 150 rpm when drive is engaged, due to the torque taken up by the torque convertor (oil clutch). If this did not occur, the motor could be close to stall phase every time you engage drive.
I don't think you have a problem, but might pay to check your idle speed settings via the workshop manual for Prados.

Regards
Frank.
AnswerID: 30648

Follow Up By: mike - Wednesday, Sep 10, 2003 at 17:07

Wednesday, Sep 10, 2003 at 17:07
Frank,

What a informative and precise reply! Thanks a lot.

The reason i asked the question was that i felt slight vibration at the steering wheel when the car is stopped in "D", while idle on "P" or "N", there is no vibration at all on the steering wheel. I guess it's normal.

Thanks again, Frank.

Mike
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FollowupID: 21709

Reply By: Martin - Wednesday, Sep 10, 2003 at 19:02

Wednesday, Sep 10, 2003 at 19:02
Normal for all autos I've ever had including a 1997 and 1998 Prado
AnswerID: 30706

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