Results 1 to 7 of 7
  1. #1

    Symptoms of a bad Cat converter

    wat are some symptoms of a bad cat converter?

    the car runs but it hesistates from a stop, exhaust smells like rotten eggs

    How can i check for a bad cat

  2. #2

    Re: Symptoms of a bad Cat converter

    Quote Originally Posted by GrandPrix34
    How can i check for a bad cat
    The smell is a first indicator, but after driving look underneath the car.
    If the cat is smoking, or glowing red from the heat of combustion, it's has a minor clog in it.
    If the car fails to idle but runs when gas pedal is applied, it could be a severely clogged cat.
    When cold, if the cat rattles when shaken, the internals are breaking apart and can create future issues.

    - Erik
    2003 Volkswagen Jetta GLS
    1.8 liter turbocharged 20v I4 - [AWP]
    "...and, yes, I have been CEL free since August 18th, 2003..."

  3. #3

    Symptoms of a bad Cat converter

    Another way a cat becomes clogged is that it turns into a big clump where the carbons have blocked all the honey comb mesh inside the cat and you don't hear rattling.

    Get a back pressure gauge $27. I would get a Seafoam Motor Tune-Up from Napa. It gets rid of most carbon build up in the engine and cat. 1/3 in fuel tank, 1/3 in oil crankcase, 1/3 in intake vacuum through the brake booster (you need to remove the brake booster and put a funnel and pour it in there while the engine is running). Turn off the engine after the seafoam is empty. Let is sit for 30 minutes or more. The longer the better. I recommend driving the car at night at less traffic highway and put the throttle at WOT and it would cause a lot of smoke which is normal.

    See if that clears the cat clog and if not it clears your carbon buildup anyway and then do an oil and oil filter change.
    1999 Dodge Truck RAM 1500 1/2 ton 4WD V8 360 Z 5.9L SFI QUAD CAB Sport Ed<br />1999 HONDA TRUCK PASSPORT 4WD V6 03165 3.2L MFI<br />1997 MERCURY SABLE 6 Cylinders 182 U 3.0L SFI<br />1994 PONTIAC GRAND AM L4 138 3 2.3L MFI SOHC QUAD<br />1990 OLDSMOBILE CUTLASS V6 191 T 3.1L MFI<br />1981 MERCEDES BENZ 240D 4 Cylinders 02399 2.4L DIESEL

  4. #4

    Join Date
    Aug 2002
    Posts
    1,055
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Symptoms of a bad Cat converter

    Also , don't the exhaust manifolds glo if your cat's all plugged up?

  5. #5

    Join Date
    Oct 2003
    Posts
    27
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Symptoms of a bad Cat converter

    Another sign of a blocked cat is loss of power when pulling on a
    steep upgrade, with a rotten egg smell. Also if its severe you will
    see the outer shell of cat glowing after a long ride.

  6. #6

    Join Date
    Jan 2003
    Location
    East Grand Forks, MN
    Posts
    5,161
    Thanks
    1
    Thanked 6 Times in 5 Posts

    Symptoms of a bad Cat converter

    My cat has melted into a solid chunk. There was/is no smell coming from it. The only thing I've experienced is a loss of power, supposedly from the backpressure caused by the solid cat.
    .. somebody at General Motors must know how to design a turn signal stalk that feels more like a knife in butter than a snapping tree branch.

  7. #7

    Join Date
    Sep 2003
    Posts
    318
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Symptoms of a bad Cat converter

    check the O2 sensors first, how long since they been replaced, bad ones can cause a smell too, mine did, also I heard of the dollar bill check for a bad cat, put a dollar bill up to the exhaust tip about 1/2 inch away while car is running, if it is intermittently sucked back against the tip then the cat is bad

Visitors found this page by searching for:

symptoms of a bad catalytic converter pontiac

jetta catalytic converter symptoms

signs of bad cat

symptoms of a bad catalytic converter jetta

symptoms of a bad cat converter

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •