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Ezra
Dodge Dakota
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5/13/2003
21:49:32
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 Subject: 1997 3.9 Rough Idle
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I have a 1997 3.9L 4x4 Sport.
Recently the truck started to idle really rough. It idles @ about 650rpm but when the truck is warm and in drive or park the idle drops momentarily to about 550 and causes the truck to jerk.
I have changed the distributor cap/rotor, new plugs/wires. I took it into dodge and they charged me $115.00 (can) to tell me that the throttle body needed to be cleaned and the injectors were dirty. They wanted to charge me $480 to do the work. I decided to do it myself. I have cleaned the throttle body with Klean Flow cleaner and ran a Klean flow injector cleaner through the gas tank. It ran great for about two days and now it is worse then ever. Does anybody have any suggestions? Please help.
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TB
Dodge Dakota
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5/13/2003
21:52:34
|  RE: 1997 3.9 Rough Idle
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did you remove the TB when you cleaned it or just blow some stuff down the bores
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Ezra
Dodge Dakota
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5/13/2003
23:12:04
|  RE: 1997 3.9 Rough Idle
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I just blew it down the bores. Do you think it would make a big difference if I removed it to clean it?
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TB
Dodge Dakota
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5/14/2003
06:56:50
|  RE: 1997 3.9 Rough Idle
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Message:
that's the only way you probably didn'tget the IAC clean
Maintenance: Cleaning the Throttle Body
Most people think that cleaning the throttle body requires a can of Carb/Throttle Body Cleaner and a quick "wash" of the bores. This may work, but only washes the dirt and cleaner down into your intake manifold where it can puddle up and break down the belly-pan gasket. Then, it also is pulled into the combustion chamber where is can foul up the spark plugs.
The proper way to clean your throttle body is to remove it from the engine (you'll need a small pan, some compressed air, and a new throttle body gasket for this procedure):
1. Remove your air hat from the throttle body
2. Disconnect the sensor connectors (TPS, MAP, and IAC)
3. Remove the four throttle body bolts
4. Lift the throttle body up and away from the intake manifold (place a rag over the manifold opening to prevent anything from falling inside)
5. Remove the three sensors (Do not drop them)
6. Remove the three screws for the throttle linkage (Not required...can be done with linkage attached)
7. Place the throttle body in a small pan and spray Carb/Throttle Body Cleaner in the bores, underside passages, and ports. Let soak for about a minute.
8. Clean the IAC Solenoid - Refer to How to Clean the IAC Solenoid.
9. Spray some more Carb/Throttle Body Cleaner in the bores and ports of the throttle body.
10. Wipe clean with a lint free rag (baby diaper works well) and blow out all the ports with some compressed air (a small can from a electronics store works just fine).
11. Reinstall all sensors, then reinstall on your vehicle with a new Throttle Body gasket (don't forget to remove the rag).
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Maintenance: Cleaning the IAC Solenoid
This is recommended at every Tune-Up to prevent excess carbon buildup on the IAC plunger. In some cases, you'll notice a slightly erratic idle quality. This is the first step in taking care of that problem. IAC = Intake Air Control (Solenoid).
1. Remove the Air Hat from the Throttle Body
2. Disconnect the sensor harness from the IAC Solenoid (Rear of Throttle Body)
3. Remove the two Torx-25 Screws
4. Remove the IAC Solenoid (Be careful not to lose the rubber O-Ring)
5. Spray some Carb/TB Cleaner in the IAC port on the Throttle Body and let it sit.
6. Spray some Carb/TB Cleaner on the tip of the IAC Solenoid and wipe clean (Do NOT forcefully twist or push the plunger - You will damage the Solenoid. Wipe very gently.)
7. Spray a little bit more Carb/TB Cleaner in the IAC port on the Throttle Body and wipe clean with a thin/lint-free rag
8. Reinstall the IAC Solenoid (Make sure you don't lose the rubber gasket on the solenoid)
9. Reinstall the sensor connector and airhat
10. Start the engine and let idle for about 1 minute.
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