2001 mustang strong exhaust smell - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 12-17-2010 Thread Starter
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2001 mustang strong exhaust smell

I am looking at a 2001 V6 mustang with 5 speed to buy for my kid. It has about 150k miles, has factory intake, and aftermaket muffler (semi loud). The service engine light is on and I can see the 02 sensor is not hooked up. The car starts, runs, and drives good, but the exhaust smells really strong (rich maybe). Does not smoke when started or revved up. It is dirt cheap so I am willing to put some $$ in it. Any ideas? I have read that aftermarket exhaust may cause this. Anything else I can look for?

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post #2 of 6 (permalink) Old 12-17-2010
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ive never heard that before, about aftermarket exhausts making it smell stong. but i would contribute the smell to the o2 sensors missing.

From what ive learned, the o2 sensors read the emmisions after the cats (hydrocarbons and carbon monoxide) and then work in corrolation with the tempurature readings in the computer to adjust the fuel/air mix to keep the engine running at best possible performance. If the o2's are out of the equation, that would throw a code and cause the light. Also could make it run rich like you said and in turn cause the smell.


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post #3 of 6 (permalink) Old 12-17-2010
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Originally Posted by Ohio_Tech_Fan View Post
ive never heard that before, about aftermarket exhausts making it smell stong. but i would contribute the smell to the o2 sensors missing.

From what ive learned, the o2 sensors read the emmisions after the cats (hydrocarbons and carbon monoxide) and then work in corrolation with the tempurature readings in the computer to adjust the fuel/air mix to keep the engine running at best possible performance. If the o2's are out of the equation, that would throw a code and cause the light. Also could make it run rich like you said and in turn cause the smell.
I agree completely with everything you said, i have one thing to add, since the O2 sensors are missing did they plug the holes?? with them being open it could lead to a stronger exhaust smell than normal.

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post #4 of 6 (permalink) Old 12-17-2010
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also if you were juss looking at the car, and didnt allow it to warm up to operating temp, then it woulda been a richer mixture than normal, intended for warming up the engine, then the lack of 02's could have also increased the mixture to be even richer possibly.

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post #5 of 6 (permalink) Old 12-17-2010 Thread Starter
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02 sensors are in. I drove the car till warmed up. Would an additional EGR problem cause this? I have looked at a few mustangs of that year range with EGR solenoid problems throwing a code.
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post #6 of 6 (permalink) Old 12-18-2010
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my advice is take it to your local autoparts store (autozone/ advanced auto parts for me) and ask them to read your code. then look up on the forum or google what the code means, and thats a good place to start to find the source of the problem. my guess is the smell is related to the service engine light, so id look into that first. juss my 2 cents.

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