Rough idling
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Rough idling
Hey guys,
2006 Escape, V6 3.0. Replaced the alternator and it is testing as good, no issue there. After replacing it, the truck has a really rough idle. Took it to Advance to get the Check Engine error codes, and got this:
-C2900 Vehicle ID Number mismatch
-U1900 CAN communication bus malfunction receive malfunction
-B1805 Mismatched PCM and/or ABS-TC Module
-P2195 Oxygen Sensor signal biased/stuck lean bank 1 sensor 1
-P2197 Oxygen sensor signal biased/stuck lean bank 2 sensor 1
-P2195 Oxygen Sensor signal biased/stuck lean bank 1 sensor 1 PENDING
-P2197 Oxygen sensor signal biased/stuck lean bank 2 sensor 1 PENDING
I took out the transaxle and intermediate shaft to get the alternator out. I also removed the intake manifold to remove the top alternator bolt and an exhaust shroud covering the alternator.
Anyone have any ideas of what in the world I did? haha
2006 Escape, V6 3.0. Replaced the alternator and it is testing as good, no issue there. After replacing it, the truck has a really rough idle. Took it to Advance to get the Check Engine error codes, and got this:
-C2900 Vehicle ID Number mismatch
-U1900 CAN communication bus malfunction receive malfunction
-B1805 Mismatched PCM and/or ABS-TC Module
-P2195 Oxygen Sensor signal biased/stuck lean bank 1 sensor 1
-P2197 Oxygen sensor signal biased/stuck lean bank 2 sensor 1
-P2195 Oxygen Sensor signal biased/stuck lean bank 1 sensor 1 PENDING
-P2197 Oxygen sensor signal biased/stuck lean bank 2 sensor 1 PENDING
I took out the transaxle and intermediate shaft to get the alternator out. I also removed the intake manifold to remove the top alternator bolt and an exhaust shroud covering the alternator.
Anyone have any ideas of what in the world I did? haha
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Does anyone have any ideas or had an issue like this? I looked all over the engine for something not plugged in and checked everything to see if something wasn't plugged in the right way.
As I was typing this, it got me thinking: I never checked fuses. Would that have anything to do with it? It is storming here so I cant jump out there immediately and check.
As I was typing this, it got me thinking: I never checked fuses. Would that have anything to do with it? It is storming here so I cant jump out there immediately and check.
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From: Rio Rancho New Mexico
Sounds like an intake manifold leak to me. You definitely have something unplugged too. Some of those codes could be residual from another repair but unless you were swapping out your PCM there is no reason for that PCM code. Spray the intake area with carb or brake clean and check for idle change. If the idle changes you have a leak. That is your lean code and rough idle.
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Joined: Jan 2002
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From: suburban atlanta
I'd bet on the intake manifold O-rings being leaky. Both exhaust sensors are getting a 'lean' code or pending lean code. That indicates excessive O2 molecules in the exhaust that weren't used in oxidizing fuel, thus the 'lean' condition.
You could also have broken or eroded PCV system hoses. There's an elbow that deteriorates and allows excess air into the intake, leading to lean and a rough idle.
Did you replace the O-rings or re-use the old ones? Did you try to insure they were not 'flattened'? The O-rings will look good, but if they have taken a 'set' and are no longer flexible enough to return to a circular or oval cross section when the intake is removed, they will likely leak when re-installed. I'm pretty certain if you get them into the grooves in the manifold, they stay there during installation, but if they are flattened, they won't seal properly. New do not cost a lot.
tom
You could also have broken or eroded PCV system hoses. There's an elbow that deteriorates and allows excess air into the intake, leading to lean and a rough idle.
Did you replace the O-rings or re-use the old ones? Did you try to insure they were not 'flattened'? The O-rings will look good, but if they have taken a 'set' and are no longer flexible enough to return to a circular or oval cross section when the intake is removed, they will likely leak when re-installed. I'm pretty certain if you get them into the grooves in the manifold, they stay there during installation, but if they are flattened, they won't seal properly. New do not cost a lot.
tom
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Just wanted to report in, I replaced the intake manifold gaskets and everything worked like a charm. They looked fine in the manifold but when I pulled them out they were cracked. Thank you so much for your help!
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insane_goofball
1987 - 1996 F150 & Larger F-Series Trucks
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Nov 25, 2010 08:21 PM
