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Old 09-10-2015, 10:00 AM
hummrod hummrod is offline
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Default 2000 2.5L 5 Speed: RPMs increase when in neutral.

Im trying to get some help with a problem i've been having for a while.

I have instances when I'm coming to a stop i'll shift to neutral to coast to the stop, but the RPMs increase heavily, almost to like 4-5 grand. To get it to stop i basically have to stay and gear and almost stall the out the truck in order to idle normally at a stop.

I'm also not sure how to diagnose this one, but now almost everyday I am driving, 1-4 gear will keep a constant speed or continue to accelerate with my foot off the gas. It's getting extremely frustrating to have to use my brakes all the time just because my truck will not slow down with my foot off the gas. Could it be something wrong interally or just a sticky accelerator? Im not sure, any help is appreciated.
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Old 09-10-2015, 10:57 AM
stateranger stateranger is online now
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Default Re: 2000 2.5L 5 Speed: RPMs increase when in neutral.

Check the throttle linkage for binding, take the intake tube off and look at the throttle plate. You may also have a stuck idle air control valve, it is on the firewall side of the throttle body.
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Old 09-10-2015, 11:11 AM
99RangerRod 99RangerRod is offline
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I have that problem with my 99. Some of it is the idle air control valve (IAC Valve) and the other part is vacuums and gaskets. The intake gaskets on the 2.5 weren't the best and break down after a while. I have this same issue. The other part is rotted out vacuum hoses.

Whats your milages look like?
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Old 09-10-2015, 06:10 PM
hummrod hummrod is offline
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Default Re: 2000 2.5L 5 Speed: RPMs increase when in neutral.

Mileage is just over 170k. Could it just be getting too old or will cleaning/replacing certain parts fix the problem?
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Old 09-11-2015, 01:54 PM
terryduanemiller terryduanemiller is offline
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Originally Posted by hummrod View Post
Mileage is just over 170k. Could it just be getting too old or will cleaning/replacing certain parts fix the problem?
IAC idle air control valve. You can try removing it and cleaning it along with the throttle body with carb/choke cleaner, due to age I would also suspect some vacuum leaks as well. Pull the PCV valve and clean it.
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