Rough idle

[darnelld1]

2003 discovery, 85000 miles. Had flange exhaust leak and check engine light appeared and rough idle. had exhaust leak fixed and light went away. still has rough idle. got codes 1415, 174, 159, 150, 1174. was going to replace all o2 sensors, but not sure on the cam sensor. any other advice??

 

[joey]

Being this sounds like the older D2 issue, I would clean the MAF sensor first.

 

[darnelld1]

will try that first. didnt really notice the rough idle until i noticed the exhaust leak. could that have affected the MAF sensor??

 

[joey]

Probably not, but it is something that just pops up... overtime they tend to get dirty... I would also check your air cleaner.

 

[darnelld1]

ok got codes cleared. still had rough idle when at a stop and in drive or rev. decided to check plugs. one side clean, other side lots of carbon build up on all 4 plugs on passenger side. changed out both sides and everything back to normal.

 

[joey]

I would replace the O2 sensor (front) on the side that had the carbon build up.

 

[darnelld1]

ses light back codes read again(same as before). going to change 02 sensors.