Rough idle, Crank Sensor and Bucking
Thread Starter
Audiworld Junior Member
Joined: Feb 2012
Posts: 24
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From: Mount Laurel, NJ
Rough idle, Crank Sensor and Bucking
After a timing belt job in November on my 2000 2.7 I started the engine and along with a very rough idle the check engine light immediately went on.
I checked the code and showed it was the crank position sensor, now I remembered that the one on the drivers side was a pain to get on and thinking I might have messed it up when I installed it. So I cleared the code and hasn't come back on since.
I can tell something isn't just right, when I'm going slow I can feel the rough idle taking its toll, and when I'm slowing down it kinda bucks.
Any ideas? this is definately a result of the timing belt service because it was fine before, which kinda rules out the transmission.
I checked the code and showed it was the crank position sensor, now I remembered that the one on the drivers side was a pain to get on and thinking I might have messed it up when I installed it. So I cleared the code and hasn't come back on since.
I can tell something isn't just right, when I'm going slow I can feel the rough idle taking its toll, and when I'm slowing down it kinda bucks.
Any ideas? this is definately a result of the timing belt service because it was fine before, which kinda rules out the transmission.
Thread Starter
Audiworld Junior Member
Joined: Feb 2012
Posts: 24
Likes: 0
From: Mount Laurel, NJ
After a timing belt job in November on my 2000 2.7 I started the engine and along with a very rough idle the check engine light immediately went on.
I checked the code and showed it was the crank position sensor, now I remembered that the one on the drivers side was a pain to get on and thinking I might have messed it up when I installed it. So I cleared the code and hasn't come back on since.
I can tell something isn't just right, when I'm going slow I can feel the rough idle taking its toll, and when I'm slowing down it kinda bucks.
Any ideas? this is definately a result of the timing belt service because it was fine before, which kinda rules out the transmission.
I checked the code and showed it was the crank position sensor, now I remembered that the one on the drivers side was a pain to get on and thinking I might have messed it up when I installed it. So I cleared the code and hasn't come back on since.
I can tell something isn't just right, when I'm going slow I can feel the rough idle taking its toll, and when I'm slowing down it kinda bucks.
Any ideas? this is definately a result of the timing belt service because it was fine before, which kinda rules out the transmission.
Tech Guru
Joined: Oct 2002
Posts: 8,010
Likes: 192
From: Olney, MD
?? Is it a P-code or DTC code? Bentley has:
18014 P1606 Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction
Correlation is not causation. Just because it popped up as a result of the timing belt service doesn't mean they're related, although you have a strong case. It's just that what is done with a TB service shouldn't muck with the ABS/ECU etc.
How is it you're still working on a problem that came up in November in mid-March of the following year? The guy who did the TB service should be fixing this! Oh, yeah, sounds like you did the TB service.
In general rough running on the 2.7T is a vacuum leak....get busy and see what's leaking.
18014 P1606 Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction
Correlation is not causation. Just because it popped up as a result of the timing belt service doesn't mean they're related, although you have a strong case. It's just that what is done with a TB service shouldn't muck with the ABS/ECU etc.
How is it you're still working on a problem that came up in November in mid-March of the following year? The guy who did the TB service should be fixing this! Oh, yeah, sounds like you did the TB service.
In general rough running on the 2.7T is a vacuum leak....get busy and see what's leaking.
Thread Starter
Audiworld Junior Member
Joined: Feb 2012
Posts: 24
Likes: 0
From: Mount Laurel, NJ
Yeah just pulled this code recently, ABS and brake light flickered a bit after I rotated tire, probably non-related to the rough idle. But the crank sensor did throw a code immediately after the timing belt change, do you think it could be a problem even tho it hasn't thrown a code since. I looked all over that thing for a vacuum leak and couldn't find a thing, although I did notice the egr mount behind the tensioner on the passenger side didn't have a gasket when I removed it, this might be the cause.
Tech Guru
Joined: Oct 2002
Posts: 8,010
Likes: 192
From: Olney, MD
Yeah just pulled this code recently, ABS and brake light flickered a bit after I rotated tire, probably non-related to the rough idle. But the crank sensor did throw a code immediately after the timing belt change, do you think it could be a problem even tho it hasn't thrown a code since. I looked all over that thing for a vacuum leak and couldn't find a thing, although I did notice the egr mount behind the tensioner on the passenger side didn't have a gasket when I removed it, this might be the cause.
No gasket behind EGR mount; I don't know if it's supposed to have one. But that could be vacuum leak source since Exhaust Gas Recirculation valve (combo valve?) bleeds exhaust gas into intake to lower combustion temps and reduce NOXs. You could try bleeding a propane torch (unlit) near that EGR mount and see if the engine rpm picks up...it will only do it momentarily until the idle speed compensation system compensates.
Or you can inject smoke into the intake system of stopped engine and see where the smoke leaks out. Expensive bit of kit to do this but some shops can.
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