Rough Idling

NORTHGABOY

MEMBER
2003 BMW 530I
3.0L
6 CYL
RWD
AUTOMATIC
100,000 MILES

Car idles really rough. Have checked for vacuum leaks, but can't find any. I have also already cleaned the mass airflow sensor, but it still idles rough. Could it be the DISA valve (or intake manifold control valve) or idle control valve? If so, is there a way to check them? Can someone help me diagnose what is going on with it? Thanks.

5 Replies

WRENCHTECH

MECHANIC
20,761 POSTS

You should have some codes in the computer. What are the numbers?

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Wednesday, March 9th, 2016 AT 9:03 AM

NORTHGABOY

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13 POSTS

P1083, P1085, P0171, P0174, P0301, P0305, P1346, P1348, P0491 & P0492

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Wednesday, March 9th, 2016 AT 9:07 AM

WRENCHTECH

MECHANIC
20,761 POSTS

You have a ton of lean codes and misfire codes. The first thing I would have done is a smoke test to find vacuum leaks.

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Wednesday, March 9th, 2016 AT 9:11 AM

NORTHGABOY

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13 POSTS

Can I smoke test it myself somehow or detect leaks another way? I am trying to fix it myself instead of taking it to a shop. I have already changed the thermostat on it myself. If the DISA valve is not functioning right, can it cause some of those codes? Thanks.

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Wednesday, March 9th, 2016 AT 11:02 AM

WRENCHTECH