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Post by Custom88 on Mar 5, 2006 11:02:22 GMT -6
When I start my engine cold the exhaust smells HORRIBLE. I don't mean it just smells bad, it's REALLY bad. Bad enough that if I'm inside the car it burns my nose. The exhaust is normal colored all things considered it just is extremely strong smelling. I haven't had a car smell this bad before. It's not like rotten eggs, or that type of smell, just like a bad running car I guess. I scanned it and I'm getting no codes. My gas mileage has dropped from 27 MPG to 22 MPG average though with conservative driving. I thought 02 sensor, BUT, that should only affect the emissions when the car is warmed up for a few minutes. Ideas?
I'm running Sonoco 93 Octane gas BTW.
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Post by Aurora40 on Mar 5, 2006 11:49:43 GMT -6
Does it smell like the car is running rich? Any exessive sooting of your exhaust tips or the lower bumper?
I think as the O2 sensors adjust the fuel trim tables, that will affect how it runs before the sensors warm up, though. Is it only when first started up that it does that?
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Post by Custom88 on Mar 5, 2006 11:55:46 GMT -6
It's almost like a thick Sulfur smell. It definately burns your nose whatever it is. the insides of the exhaust tips are sooty/black, but they haven't been cleaned in atleast 3-4 months. The bumper is clean other than typical salt.  When it's warm, it's not as strong, but it's still there somewhat. |
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Post by Aurora40 on Mar 5, 2006 12:55:47 GMT -6
It's almost like a thick Sulfur smell. It definately burns your nose whatever it is. the insides of the exhaust tips are sooty/black, but they haven't been cleaned in atleast 3-4 months. The bumper is clean other than typical salt. When it's warm, it's not as strong, but it's still there somewhat. Well, a cat that is getting clogged could have both the sulfur smell as well as the reduced economy (and performance). If you can get a scan tool on it, you might look at the O2 sensor readings to see if they seem to fluctuate enough. Otherwise you might have to cut the exhaust in order to have the cat inspected. Can you have your dealer look at it under warranty? |
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Post by Aurora40 on Mar 5, 2006 13:18:22 GMT -6
Oh, you might try disconnecting the battery for a bit. Reset the stored fuel tables and whatnot. See if that fixes the problem, or at least temporarily fixes it? That might point you towards sensor vs cat or something?
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Post by auroralover on Mar 5, 2006 15:27:04 GMT -6
Sounds like cat converter to me too......  |
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Post by macadamiaman on Mar 5, 2006 19:19:58 GMT -6
eh, you don't need one of those. Rip the thing out. And while you're at it, put one of those attachments at the end of your exhaust to shoot flames - no more cat to catch all that now-useful unburned fuel!
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BNICOV
Aurora Lover
Posts: 782 
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Post by BNICOV on Mar 6, 2006 10:18:34 GMT -6
Now that I saw this one, doesn't GM have an Emissions Systems Warranty?? Your cat and 02 sensors are covered under it. Check and see, you may get lucky and have this done at the General's expense.
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Post by Custom88 on Mar 7, 2006 22:26:15 GMT -6
I've noticed on the highway what seems to be a sort of "miss." I hold my foot steady on the gas to keep my speed at 70 MPH and it feels like I let off the gas for a split second then apply it, yet my foot doesn't move. It doesn't feel very smooth right now either, kind of sluggish.. Guess it's time for a dealer visit and see if they can "find" anything wrong with it. (they usually don't.. go figure.)
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Post by outttatheway on Mar 8, 2006 23:01:05 GMT -6
when you take it to the dealer do they charge you to tell you whats wrong with it even if they dont raise it up or whatever
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Post by macadamiaman on Mar 9, 2006 1:22:10 GMT -6
88 has a warranty... for a little longer  |
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Post by macadamiaman on Mar 9, 2006 1:23:14 GMT -6
But it depends on the dealer really, some will charge half an hour "diagnose" fee (up to like $35-40 or so), or others, wanting your business, will go ahead and diagnose. Depends.
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Post by kobalt on Mar 12, 2006 0:17:06 GMT -6
Run your gas tank low and fill up with a different brand of gasoline
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Post by Wacko on Mar 12, 2006 19:50:20 GMT -6
Dan, let us know what you find out. I really don't like the idea of you smelling your exhaust pipe. Can't be healthy. I do think the manufacturers are on the hook for emissions related stuff beyond the conventional warranty period. I just don't know where to look to find this out. |
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Post by Custom88 on Mar 13, 2006 22:59:07 GMT -6
can you guys tell me what's wrong with this picture?   |
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Post by Aurora40 on Mar 14, 2006 8:43:10 GMT -6
At first I was gonna say "your odo increased 12 miles, but your trip odo increased 120+", but then I remembered the decimal that is cut off.
Looks like the torque convertor disengaged vs engaged. Unless in one shot it's in 4th and the other is in 3rd?
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Post by Custom88 on Mar 14, 2006 13:46:40 GMT -6
The engine was fully warmed up in the send pic and I had driven 5 miles and was maintaining a steady speed. The first picture is after driving 12 miles and at 70 MPH on the highway. I was keeping a steady speed on both pictures.
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Post by Custom88 on Mar 14, 2006 19:00:21 GMT -6
the problem seems to have cleared up I guess. I got an average of 25.6 MPG over the span of 350 miles and the car seems to be running a lot better. I switched from getting gas at Sunoco, to getting gas at a Citgo. I'll see if that was really the 'problem' or not?  |
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Post by kobalt on Mar 16, 2006 9:34:00 GMT -6
Hopefully it was the gas - best of luck
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Post by kobalt on Mar 20, 2006 0:13:51 GMT -6
So what's the consensus? Any difference?
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Post by Custom88 on Mar 21, 2006 17:02:43 GMT -6
I'm not sure. my gas mileage has dropped again this tankful to 23.8. It just got cold again though so I guess the cold weather is to blame. |
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Post by leprkon on Mar 21, 2006 18:27:58 GMT -6
any chance the two are not related ? wild shot in the dark here, but if your battery is damaged or isn't venting right, you might get that type of smell... wouldn't explain the mileage, but...
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