Rough Idle
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Freshman User
Joined: Feb 2005
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From: Texas
Rough Idle
89 2.9L Bronco II, Just replaced my heads and installed the 4.0 radiator. Got everything buttoned back up fresh fluids and plugs cap wires and rotor. She fired right up. But seems to be idling a little rough. Seemed smoother before replacing the heads. Could it be it just needs to be driven to get everything back in sync ?
Freshman User
Joined: Dec 2005
Posts: 32
Likes: 0
It sould be running smoothly from the start. I would suspect something is up. Check the firing order, grounds (one at the back of the passenger side head) and timing.
The rough idle can be caused by many things. First check the codes and make sure the IAC (idle air control) valve is clean and the electrical connection is good. Also, set the TPS (throttle position sensor) to .9 volts when closed.
Retorque the lower intake manifold bolts while hot. You should do it the first time it is warm.
Look here for a write up...
http://www.rockzone.com/2.9L/head-removal.html
The rough idle can be caused by many things. First check the codes and make sure the IAC (idle air control) valve is clean and the electrical connection is good. Also, set the TPS (throttle position sensor) to .9 volts when closed.
Retorque the lower intake manifold bolts while hot. You should do it the first time it is warm.
Look here for a write up...
http://www.rockzone.com/2.9L/head-removal.html
Last edited by dernst; Jan 8, 2006 at 09:34 PM.
