intermittent rough idle p1341

[timbo]

A while back i posted about a rough idle on a 2000 2.7 with 95k. always fine on cold start up, sometimes when warm idle would be rough and other times absolutely fine. Car drives without issues and no CEL, no noises. Just got round to getting codes read at my local garage while getting an MOT (which it went through with no advisories, not bad for a 16 year old car!). P1341 was the only code stored, From what I've read this relates to camshaft actuators, however, there always seems to be a related CEL, with a persistent problem often related to RPMs, I don't have any of these issues. The idle, when rough, cycles up and down, sometimes worse than others, I havnt cleaned the throttle body yet, and Im now wondering if it can be related to this as I have the code and the fault is intermittent, Would be grateful if anyone can shed any light on this.

[JFP in PA]

A while back i posted about a rough idle on a 2000 2.7 with 95k. always fine on cold start up, sometimes when warm idle would be rough and other times absolutely fine. Car drives without issues and no CEL, no noises. Just got round to getting codes read at my local garage while getting an MOT (which it went through with no advisories, not bad for a 16 year old car!). P1341 was the only code stored, From what I've read this relates to camshaft actuators, however, there always seems to be a related CEL, with a persistent problem often related to RPMs, I don't have any of these issues. The idle, when rough, cycles up and down, sometimes worse than others, I havnt cleaned the throttle body yet, and Im now wondering if it can be related to this as I have the code and the fault is intermittent, Would be grateful if anyone can shed any light on this.

 

P1341 Camshaft Adjustment, Bank 1 – Below Limit Potential causes:

– Short to ground

– Actuator faulty

– Open circuit in triggering wire

– Open circuit in B+ supply

[Ahsai]

SOP for addressing rough idle is cleaning the throttle body and the idle stabilizer thoroughly first.

[timbo]

before I start ripping things apart I would be interested in peoples thoughts as to why this problem is intermittent, and with no CEL, thanks. 

[JFP in PA]

before I start ripping things apart I would be interested in peoples thoughts as to why this problem is intermittent, and with no CEL, thanks. 

 

Intermittent rough idle issues are often associated with aging or dirty MAF's, as Ahsai noted.  I would check the MAF parameters at warm idle conditions, and then give it a good cleaning with an appropriate MAF cleaner.  This would also be a good time to clean the throttle body as well; people are often amazed at how filthy they get over time.

[timbo]

thanks for the replies. new MAF fitted about 4k ago, a bad back means I can't get stuck into the throttle body for a while.