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1996 ford 351 it runs rough and rotten egg smell converters were good fuel regulator good pressure good 02 sensor changed the the oem computer changed and it dies as soon as you put it in reverse

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Posted on Apr 25, 2017


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1998 chevy k2500

The sulfuric odor may be too much fuel, a rich condition caused by too much fuel pressure, bad regulator or no vacuum to the regulator . Bad O2 sensor , linked return line , stuck open injector pintles etc. .

Aug 19, 2017 | Cars & Trucks

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check O2 Sensors, add a product called Ametech restore at next oil change, this does wonders for your vehicle, improved my BHP & MPG threefold , also as you say it smells bad (Like rotten eggs?) this will be the catalytic converter, either replace or add a product called cataclean to the fuel & take it for a run, It literally cleans all the **** fro the catalytic converter removing that rotten egg smell

Sep 13, 2012 | 1998 Chevrolet S-10 Pickup

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1992 Buick rotten egg and rough idle in gear


Feb 18, 2012 | 1992 Buick LeSabre

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I replace my 2001 ford focus fuel pump and fuel filterand now when it starts it idles rough. it will be normal for a second and bolg out. never runs for more then a minute. when i rev the motor it dies...

Was it running fine before you replaced the fuel pump and filter? I am assuming that you were having problems, because a lot of people would not replace the pump unless it wasn't working properly so just clarify that.

If this is a new problem that just came up, it could be a problem with the installation of said equipment (wrong part, not installed correctly, etc). I would check to see what your fuel pressure is at on the fuel rail (should be 40-60 psi, I don't have the spec for the Focus).

If this is just a problem that has been ongoing and you thought the fuel pump was getting week, it could be an indication that your fuel pressure regulator is getting bad or a problem not related to fuel pressure. More troubleshooting would be required.

Nov 19, 2011 | 2001 Ford Focus

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Have 1994 Cougar. When idling down upon braking such as slowing for stop sign or light, engine idles roughly. After driving short distances car emits smell like rotten eggs. Had diagnostic run and results...

The most common causes of the smell are faulty catalytic converter, an engine running too hot or a faulty fuel pressure regulator. Another minor reason could be if your using a new place to buy fuel as different companies use different additives in their fuel.

Jan 03, 2018 | 1994 Mercury Cougar

2 Answers

Fumes is coming out of the exhuust. strong smell, what to do.

If it is a strong smell of gas it could be your fuel pressure regulator going bad. If you have not changed the air filter lately it could be as simple as the engine not getting the correct amount of air mixture with the fuel. It could also be your converter clogging up and that is not good because that usually is the most expensive part.

Feb 06, 2010 | 1996 Ford Aspire

2 Answers

1996 chevy c1500 w/rotten egg smell,loss of power,rough idle

Your catalytic converter is plugged up,  If you check the exhaust output at the tailpipe you will find it restricted.
Let me know if I  can assist further.

Btw, I’m available to help over the phone in case u need at

May 08, 2009 | Chevrolet C1500 Cars & Trucks

3 Answers

2001 GMC Jimmy Idling rough

P0300 is multiple misfires.
P0171 is lean burn on left bank 1 means drivers side
02 sensor is faulty. Your vehicle is over fuelling that is why your are getting P0300 code and the rotten egg smell. Good idea is to replace both 02 sensors.

Apr 04, 2009 | 2001 GMC Jimmy

1 Answer


If it smells like rotten eggs, or coal gas, the catylitic converter needs replacing.If engine light comes on after the change 10 to 1 the 02 sensor went bad.

Mar 17, 2009 | 2000 Lincoln LS

2 Answers

Loss of power/bad smell

One of the things that it could be is that the catalytic converter has rotted away internally. The rust and particle will then clog your muffler causing loss of power. I ran into this at about 140,000 miles on mine. That could be the source of your problem

Sep 10, 2008 | 2001 Hyundai Santa Fe

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