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Old 09-17-2008, 06:19 PM   #1 (permalink)
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Help! My 300 smells like farts!

Took her out for a wee bit of a hell ride and every time I stomped on the gas I got that rotten egg-fart smell inside the car about a minute later. Wife thought I poo'd myself....it was bad.

Anyone know if this is a backed up cat, muffler, pipe or does it have to do with my CAI? I know I've smelled that stink before in one of my old beater cars but don't recall what caused the problem.

I just recently installed the Predator...never noticed the fart stank before the install.
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Old 09-17-2008, 06:44 PM   #2 (permalink)
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did you eat hard boiled eggs before you went for a drive?????




























j/k in all seriousness.. might be the gas...
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Old 09-17-2008, 06:53 PM   #3 (permalink)
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Naw man....I even stopped at the gas station to check my drawers to be sure....wasn't me....

My wife might have snuck out an SBD though but she won't fess up to it.

Seriously though it really stunk....I've pounded on the car before and never had that smell....it seems like something in the exhaust might be going bad.

I don't drive all that much so the gas is the same stuff I had before my car started stankin up the joint and I always use the good stuff.
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Old 09-17-2008, 07:29 PM   #4 (permalink)
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googling it I got this:

Possible causes:
  1. The engine's coolant level may be too low: Refill cooling system with proper type of coolant for your engine.
  2. If you have a carburetor, the choke may not be set properly, or the choke may not be working correctly: Check automatic choke linkage and choke heater operation. Repair, replace or adjust as required.
  3. The engine may have mechanical problems: Check vacuum lines and fittings for leaks. Check engine compression. Check for broken fittings and mounts.
  4. The fuel pressure regulator may be operating at too high a pressure: Perform fuel pressure test and repair or replace faulty component(s).
  5. The ignition timing may be set wrong: Check and adjust ignition timing.
  6. There may be a fault in the computerized engine and emission control systems: Scan injection and emission control system for Diagnostic Trouble codes. Replace or repair as required.
  7. The engine's thermostat may be stuck closed: Replace thermostat.
  8. The fuel injectors may be stuck partially open: Clean or replace fuel injectors

and this:
  1. There is a problem with your electronic engine control system: Scan injection and emission control system for Diagnostic Trouble codes. Replace or repair as required.
  2. The ignition timing may be set wrong: Check and adjust ignition timing.
  3. Your fuel pressure regulator is bad: Replace the fuel pressure regulator.
  4. The engine may have mechanical problems: Check vacuum lines and fittings for leaks. Check engine compression. Check for broken fittings and mounts.
  5. The engine is running too hot: Check cooling system, thermostat and cooling fanes for proper operation.

Last edited by Mr. iNCREDIBLE; 09-17-2008 at 07:30 PM.
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Old 09-17-2008, 07:43 PM   #5 (permalink)
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A few years ago I had this happen in my 96 Mark VIII LSC. The check engine light was on so I plugged it in to a scanner and it came back to tell me I had a bad O2 Sensor. It didn't specify which of the 4 sensors it was, but in the end it was a bad O2 sensor. Had the fart smell and everything.
Other than that the only thing I can think of would be a clogged catalytic converter.
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Old 09-17-2008, 07:55 PM   #6 (permalink)
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LSC, did the fart smell go away by just replacing the O2 sensor?

No engine lights are on yet.
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Old 09-17-2008, 08:06 PM   #7 (permalink)
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I'd say o2 sensor or cat.
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Old 09-17-2008, 08:41 PM   #8 (permalink)
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Quote:
Originally Posted by 2Yutes View Post
LSC, did the fart smell go away by just replacing the O2 sensor?

No engine lights are on yet.
Yep, I took a wild guess that it was the second left O2 sensor and it turned out to be the culprit behind the check engine light and the fart smell. I guess since the sensor was bad it was letting too much gas into the engine and fuel was going into the catalytic converter. The rotten egg smell was the gasoline breaking down the cat.
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Old 09-17-2008, 10:05 PM   #9 (permalink)
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I bought a used car once, and before I picked it up, the dealer steam cleaned the whole interior. The next day it smelled like total @$$ inside...whew, nasty!!

The smell was from the carpet and underlay getting and staying wet. It took weeks for the carpet to completely dry and the smell to go away. Worst stink I've ever experienced in a car. I was too embarrassed to take anyone for a ride for the first month.
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Old 09-18-2008, 06:11 AM   #10 (permalink)
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Quote:
Originally Posted by LSCto300C View Post
Yep, I took a wild guess that it was the second left O2 sensor and it turned out to be the culprit behind the check engine light and the fart smell. I guess since the sensor was bad it was letting too much gas into the engine and fuel was going into the catalytic converter. The rotten egg smell was the gasoline breaking down the cat.

I had a 87 lsc nice car for the day
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