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Old 11-19-2009, 07:33 PM
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Exclamation Vw Jetta Smoking black

i recently bought this vw jetta and within a month it blew the mass airflow metter. i noticed that the car was throwing black smoke out of the exhaust. i took it to a shop and the replaced the metter the said it was running lean. the car still does it but it only does it when its on idle and i rev the engine. i replaced spark plugs and wire but no luck. any idea wat might be wrong.
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Old 11-19-2009, 07:50 PM
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So you replaced MAF sensor and now its running lean?

You could have fouled your o2 sensor when you were running rich and blowing black smoke out of the exhaust.

Last edited by mcrow; 11-19-2009 at 07:52 PM.
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Old 11-19-2009, 11:47 PM
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2.0? 1.8t? vr6? lol which engine and yea id check out ur o2 sensors
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Old 11-20-2009, 04:45 AM
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sure its not a TDI? Black smoke is common on a diesel.
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Old 11-20-2009, 04:46 AM
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Sorry just read now that you replaced spark plugs and wires. A diesel doesn't have spark plugs.
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Old 11-20-2009, 04:59 AM
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Quote:
Originally Posted by mcrow View Post
So you replaced MAF sensor and now its running lean?

You could have fouled your o2 sensor when you were running rich and blowing black smoke out of the exhaust.
it was running lean untill i replaced the maf but its still smoking. the 02 sensor ur talking bout is the one on the cat rite? also i think my cat is bad cuz it rattles when i rev my engine.
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Old 11-20-2009, 05:00 AM
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Originally Posted by 05GTI1.8T View Post
2.0? 1.8t? vr6? lol which engine and yea id check out ur o2 sensors
the engine is a 2.0
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Old 11-20-2009, 07:02 AM
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There are 2 O2 sensors. 1 precat and 1 after cat. Pre cat sensor usually fails. Also cat maybe clogged. Rattle could be from inside cat or just heat shield. Get a hi flow cat and replace front O2 sensor and should clear up issue.
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Old 11-20-2009, 10:49 AM
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Quote:
Originally Posted by stemz View Post
it was running lean untill i replaced the maf but its still smoking. the 02 sensor ur talking bout is the one on the cat rite? also i think my cat is bad cuz it rattles when i rev my engine.
You dont blow black smoke with lean, you were running rich.
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Old 11-20-2009, 02:22 PM
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Quote:
Originally Posted by mcrow View Post
You dont blow black smoke with lean, you were running rich.
I figured if i kept scrolling this would be posted, at least i hoped so.

Black smoke is not a sign of LEAN. it is rich if not just a result of a clogged cat.

Your o2 should be throwing a CEL on your dash if it is fouled.
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Old 11-20-2009, 09:20 PM
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well i dont have any check engine lites on or anything
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Old 11-20-2009, 09:42 PM
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Quote:
Originally Posted by stemz View Post
well i dont have any check engine lites on or anything
Hey dude i had this happen to me on my car, i changed the cat/spark plugs and plugs/changed the oil but nothing fixed it untell i changed my first O2 sensor replace that and it should work, it wont work right away but it will clear ur black smoke and will run normal and as for your cat ratteling then its from the in side of the cat, the filter in the cat has burnt and it shakes in side the cat if ur car has under 160000km then u should b e still coverd under a recall warrentee take it to a vw dealer if ur car has less then 160km and u should get a free replacement
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Old 11-20-2009, 10:52 PM
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awsome thanks man
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