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2.5 hanging throttle and rough idle


Old 10-29-2014, 10:54 PM
greenweenie is offline
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Join Date: May 2007
Location: Seattle
Posts: 115
Default 2.5 hanging throttle and rough idle

I've got a couple of problems that may be related, I've thrown a lot of time and nickels at this thing to no end. 94 Dakota, 2.5, 5 speed manual. I know this is the Daytona forum but there are many more Daytonas with 2.5's than Dakotas so I figured I'd have better luck here.

The two symptoms are:

Engine does not come back down to normal idle speed quickly, it hangs for a 3-4 seconds after releasing the throttle. It started doing this randomly several weeks ago.

I have a rough idle, I can hear "puffs" from the exhaust pipe at idle which seams to indicate it's a misfire. It idles smoothly after cold starts, and seems to get progressively worse as the engine warms up.

Otherwise the engine seems to run fine.

What I have done:
New injector, rebuilt throttle body, new IAC
New wires, plugs, distributor, ignition coil
Check ignition timing, 12* per FSM
New crank position sensor
New coolant temperature sensor
Checked all vacuum lines, new air filter
Checked for ODB trouble codes, none
New head gasket
New intake gasket
New o2 sensor
Unplugged the computer for 30 minutes in attempt to reset it

All to no avail. What do you guys think?

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Old 10-30-2014, 01:45 PM
smokesxt's Avatar
smokesxt is offline
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Join Date: Aug 2009
Location: poynette WI
Posts: 1,040

Check your Coolant temp sensor.
Backprobe it from a cold start.

Start with that as everything else is controlled by input from the Coolant sensor.
I'd also check the IAC if its not the CTS, I've never gotten a new one that lasted more then a couple weeks, so I went back to one I got from a JY, Issues solved.
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