Cat Glowing red hot!!!!

[yellow182jon]

Had my gasket from the downpipe to the cat replaced on friday ever since this the car has felt down on power, then the other night from coming bk from mate's the car just would not go. Got home out the car smelt like burning lokked uder the car an the cat was glowing red I was shocked.
As soon when the the chapp had fitted the gasket the light appeared on the dash for gas monitor warning went down the road to check that all was ok but no, car did'nt wanna go over 20 mph looked like it was going to stall so took it bk the the mechanic he drove around said everything was fine.

what should I do.


john

 

[SBV116]

Sounds to me like the exhaust is possibly blocked / cat collapsed. Does it make a lot of induction noise? usually a sign.

 

[ditz]

you sure its not missfiring?
that would throw fuel down the exhaust and make the cat glow red hot

 

[yellow182jon]

Sounds to me like the exhaust is possibly blocked / cat collapsed. Does it make a lot of induction noise? usually a sign.

it make as much induction noise as normal, would the gasket be a cause to this was running fine with out the gasket.

 

[yellow182jon]

you sure its not missfiring?
that would throw fuel down the exhaust and make the cat glow red hot

 

[yellow182jon]

you sure its not missfiring?
that would throw fuel down the exhaust and make the cat glow red hot

It's missfiring, I would have my foot flat to the floor in 2nd gear and have nothing just stops me around 20 mph then all of a sudden the car let's me rev an the car goes aswell as ever.

 

[SBV116]

It sounds weird the way it only happened after the exhuast job, could just be coincidince though i suppose!!

 

[16v_jon]

To me it sounds like its mis-firing the cat will be glowing because of extra fuel being thrown into the exhaust.
Check all the plugs and leads and coil pack are all tight. The leads may have got wet causing them to arc (same symtoms) spray them with wd-40 to get rid of any moisture.

 

[sideways danny]

sounds either VERY lean or an exhaust blockage to me. It may have been a blockage that caused the gasket to fail to start with and now it's sealed you have huge back pressure. For test purposes, make it blow at the post cat join and see if it gets anything back. I'd want to plug it in to diagnostics too

 

[D1CKY]

I don't know if its just me, but if there was excess fuel going down the exhaust and getting ignited at/in the cat area.

Wouldn't that f**k that cat ?

Meaning a new one is needed.