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Why does engine rpms stay up when in N?

 
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Old 07 Dec 2007, 04:20 am
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Default Why does engine rpms stay up when in N?

Like I will be driving and will switch to N but notice that the rpms still stay where they were while the gears were engaged. All of my other cars will experience a drop in RPMs when I switch to N.


Is that normal?
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Old 07 Dec 2007, 07:32 am
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Default Re: Why does engine rpms stay up when in N?

No, it's not normal and it might have to do with a dirty or faulty IAC (Idle Air Controller) located right behind the throttle body.

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Old 08 Dec 2007, 04:25 am
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Default Re: Why does engine rpms stay up when in N?

got my first oil change (since becoming the first owner and about 1000miles later) and it seemed to resolve the problem. I got 330-340miles before the oil change. I am wondering if I would be too optimistic on seeing if I can get more than 360 miles per fill up =)
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Old 17 Dec 2007, 12:31 am
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Default Re: Why does engine rpms stay up when in N?

ok, its happening again. the rpms wont fall when i shift into neutral and also, when in N I can't rev the engine past 3500rpms. it will just drop back down to 3000rpms.
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Old 17 Dec 2007, 12:43 am
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Default Re: Why does engine rpms stay up when in N?

Quote:
Originally Posted by Ptcruzer07 View Post
also, when in N I can't rev the engine past 3500rpms. it will just drop back down to 3000rpms.
now that is your rev limiter. its normal for it not to rev past 3500 when in N or Park.

as for your RPM issue when driving, sounds like Crewzin is right. You might want to schedule a service and get it looked at. should be covered in your warranty.
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Old 17 Dec 2007, 09:28 am
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Exclamation Re: Why does engine rpms stay up when in N?

Ptcruzer07,
I think the RPM's being above normal idle when you but it in neutral while moving or coasting to a stop is normal for the 4 speed electronic controlled tranny. Both of our Cruisers do this along with the 1997 Plymouth Breeze and 1996 Grand Voyager we had. The RPM's would stay around 1500-1800 until just before you made a complete stop, then they would drop to the normal idle RPM.
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Old 17 Dec 2007, 02:44 pm
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Default Re: Why does engine rpms stay up when in N?

Quote:
Originally Posted by tpscruiser View Post
Ptcruzer07,
I think the RPM's being above normal idle when you but it in neutral while moving or coasting to a stop is normal for the 4 speed electronic controlled tranny. Both of our Cruisers do this along with the 1997 Plymouth Breeze and 1996 Grand Voyager we had. The RPM's would stay around 1500-1800 until just before you made a complete stop, then they would drop to the normal idle RPM.
when I say the rpms won't drop, I don't mean drop down to zero. I mean when I am at 60mph, going down hill and shift into N, the rpms stay around 3000 rpms
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