Rough idle/check engine light - Dodge Dakota Forum

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Brad
Unregistered

1/05/2001
17:13:03

Subject: Rough idle/check engine light
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I've got a '93 3.9 V6. The thermostat locked up, and I overheated. After putting in a new thermostat, the engine can't seem to find idle, and the check engine light is on. The fault code (34) says speed control vacuum, but I can't find any vacuum leaks.

Tried replacing the coolant temp sensor, but it didn't help. The temp guage seems ok.

Any ideas?

Thanks

Brad
Unregistered

1/16/2001
13:02:12

RE: Rough idle/check engine light
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Message:
Followup (in hopes of saving someone else the hassle):

There are 2 coolant temp sensors. One for the guage, and one for the PCM that sits behind the thermostat housing. Turns out I had knocked the second one off, but I didn't realize there were 2, so I kept messing with the wrong one. The dealer plugged it back in for $78, and idle is back to normal.

Brad

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