Does this sound like catalytic converter?

[ericnord]

Started '99 e-Sport w/ 100k miles up this morning and it would not hold an idle. Starter is fine, battery is fine, it turns over fine, RPMs go up like normal on startup, but on the way down the tach doesn't stop, keeps going until it dies. This happened several months ago and a friend at a dealership looked at it and cleaned a part (not sure if throttle body or MAF) and it worked fine ever since. I needed to go to work so I disassembled air intake this morning and put it back together without doing anything and it started. Wife took me to work and truck to shop.

We have moved and now don't have friend at dealership and new mechanic believes it is build up in catalytic converter. Does this sound accurate or should I just clean the throttle body and MAF again? I would just try the throttle body and MAF, but I don't want wife stranded if it is the catalytic converter.

Thanks,
-Eric

 

[ions]

With that many miles on it try cleaning the IAC there should be a write up on it just search or just buy a new one they are like $45 or $55.

 

[Blee1099]

Its not the catalytic convertor unless when you start the truck and you can see it turn bright red. Definately sounds like a IAC acting up.

 

[ejbeach]

agreed

I agree, with a bad cat it will lose power as the engine revs up, but it shouldn't cause it to stall at idle. The IAC would be my first guess.

 

[spindlecone]

Also with a bad cat you should be throwing a CEL, as above clean or replace the IAC and clean the maf while your at it.

 

[MAXIMIS1]

DEFIANTLY NOT the converter at least for cold starting, converters generally "act up" once warmed up!!