Question about 1991 Lexus LS 400

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My daughters 91 lexus LS 400 smells like rotten eggs, the problem is how do you check which converter is bad, there are 3, two pre cats up front, and one rear cat.

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  • Ned  White
    Ned White Dec 29, 2010

    Not 100% sure about this, but I think when they go bad, they glow, if you stick your head under there at night and peek after it has been running, one of them things should be glowing hot. Check it out.

  • Ricky Gittins
    Ricky Gittins Dec 29, 2010

    I was wondering if you can check it by testing for the temp, with a infered tool

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  • Lexus Master
  • 2,100 Answers

Yeah, try it, It won't hurt.

Posted on Dec 29, 2010

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IF WHAT YOU SMELL IS RAW GAS THAT IS AN URGENT PROBLEM THAT SHOULD NOT BE PASSED OVER. IF YOU SMELL A ROTTEN EGG SMELL THEN YOU MIGHT HAVE A CATALYTIC CONVERTER PROBLEM THAT GIVES POOR ACCELERATION. CHECK FOR FUEL LEAKS AND CHECK FOR ENGINE VACUUM AT IDLE. MUST BE AT LEAST 19 INCHES,. IF NOT, YOUR CONVERTER IS PLUGGED.

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If the smell is like rotten eggs you have a cat converter that has failed. If it is another smell (can't tell because I don't know what kind of antifreeze you have) but you will see while smoke it sounds like you have a blown head gasket. If the gasket blew badly enough, you may be loosing compression on one or two cylinders. which could cause it to run poorly. and having your map sensor unplugged doesn't. help.

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1 Answer

SERVICE ENGINE LIGHT


The sensor will be external and cats don't always smell like rotten eggs when they go. Also check as you will probably have a post converter sensor as well that sends a signal back to the main computer.

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