rich exhaust smell v12 - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 08-07-2019, 09:28 AM Thread Starter
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Vehicle: 98 e320 and 2000 sl600
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rich exhaust smell v12

Asking for advice on fixing this. 2000 v12 only 78k miles, replaced spark plugs, new MAF, replaced
vacuum hoses on top of engine. Cars runs great. No codes. I have already bought all new coils but have not used yet, no codes. I am thinking my next step might be replacing injectors maybe 4 at a time. No gas leaking anywhere. Do not drive the car much but when I return home and put in garage. I go back in after a bit and it smells RICH big time. Ok guys I need your best thoughts here
What's is most likely to be the problem on these cars? I seen things like ECU, please tell NO to that. Thanks pete --- any help appreciated, I live in Phoenix and probably won't attempt to fix until it gets cool around here.
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post #2 of 5 (permalink) Old 08-07-2019, 11:29 AM
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When this happened to me, it was one of the 3 hoses that led to the carbon canister located in the driver's side front wheel well. It's actually in the rear part of the front wheel well.

The canister traps fuel vapor and when it leaks, it smells like fuel.
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post #3 of 5 (permalink) Old 08-07-2019, 05:42 PM Thread Starter
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Thank you very very much. I was starting to price fuel injectors. I would have never thought about the carbon canister and if I started looking for it, it would have taken me a while to find it. There is one under there I remember seeing it . I will check the hoses and replace all or whatever is needed. Thanks again, you helped me before when I was working on a difficult to replace sensor. I will send you a message when I fix it. I may find a sweat band and get under there sooner than October. thanks again pete
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post #4 of 5 (permalink) Old 08-08-2019, 04:06 PM
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Don’t waste your money with buying parts and throwing at you car. Sometimes the problem is way simpler than it seems.
I would almost eliminate the coils as a culprit. You say your car is a 2000, so degrading wires is pretty much non existent.
What I would check first is the fuel pressure regulator. If it’s bad, raw fuel will be sucked into the driver side plenum thru the vacuum hose, which on the M120 is the passenger side bank. The car will still run, but it will burn pig rich on the passenger side.
I suggest you check out soon what causes this rich condition, because you CAN ruin the engine in a hurry by either washing down the cylinder walls, or clogging up the converter.
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post #5 of 5 (permalink) Old 08-08-2019, 04:54 PM Thread Starter
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Thanks a lot for the reply. I will look into the operation of the pressure regulator and determine if I have a problem. It's hot here right now but I am gearing up for some work on the little monster with big motor. Thanks again pete
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