bonnie420

i dont understand why my 1 cat is burnning red hot can anyone help???

Mikie13

Second time today you posted this davidv(that I saw anyway)...


OP, I'm not a physicist or anything...but thats usually indicative of something blocking it. My guess is the guts of the Cat began breaking down and are now clogging it up. The heat has no way to dissipate out of the exhaust on that side, so it superheats and glows...similar to holding a torch flame to metal to soften it up, etc.

quietkilla6

iTrader: (1)

Id say thats the most logical answer.

hellsoldiers08

iTrader: (3)

Im in for seeing a picture of this

rcdash

iTrader: (18)

Unburnt fuel makes cats burn hotter, so if one side is running richer, that would be bad, as it will burn the cat out.

bonnie420

im down with the unburnt fuel thing .its been running like crap ever sence i had this motor put in . i just got the cats off an o7 but this same motor has not run rite from the get go. what would be my next step i have replaced all 4 o2 sencers the upper harnness for plugs and fuel injects. i guess i should have got the ecu out of the car i got this motor from .thing is i be a broke ho .and im fastley running out of money.

kramykram

iTrader: (135)

well if you put cats from an 07 on your 03 that might create a few leaks. pull the cat off and check it out. if anything if they are later model cats and not 07's just bust the guts out of both or get test pipes

rcdash

iTrader: (18)

yes a leak would cause a falsely lean afr on the side of the leak, which the ECU would try to compensate for by dumping more fuel (turning the cat red hot).

GT-ER

iTrader: (4)

Mikie13 is probably right...cat is probably damaged ( clogged ) and thus is making the hot gases stay longer inside making it hotter.

Mikie13

It does makes sense that throwing more fuel into it from running poorly could cause it as well.

However, a clogged up cat on one side could also conversely make the engine run poorly as well.

You throwing any codes? Are you positive the injectors are running correctly and your plugs are good? etc...few things you could check now at this point since people mentioned a couple other ideas.

Jarred@Z1

iTrader: (4)

could be a timing issure ive seen this from one of the cam sensors reading incorrectly.

davidv

iTrader: (2)

Catalytic converters are a minor concern. If the motor is not running properly new catalytic converters will not fix it.

Zazz93

iTrader: (2)

The cats could be whole issue, but that is hard to determine from the original post. Main points I think we need to diagnose the problem is what codes, if any, are being displayed and how bad did it run just after installation compared to now.

Tommy Wang