catalyst removed , blanking plate???

[Legoman]

heres one for the guys with mechanical knowledge (probably a mercedes mechanic)

i had the catalysts removed on my car as they were knackered and its pre-cat year car. now after i was browsing i found this

http://www.detali.ru/cat/oem_mb2.as...GM=717.450&CT=M&cat=520&SID=01&SGR=065&SGN=07

if you read the bottom text , part 004 (*004 ON VEHICLES NOT EQUIPPED WITH CATALYST,LOCK AIR INJECTION BORE BY MEANS OF 104 016 00 33 COVER)

what the hell is this and should i now get this part and block whatever its on about?

i havent a vague idea what its on about tbh. its part '59' on the image and seems to go on the exhaust side from what i can see. so is it that pipe that comes out of middle and should i remove it?

 

[Legoman]

bttt. or bump

 

[Uncle Benz]

The air injection system is used to add air into the exhaust during warm up, so the rich mixture burns more completely, and does not poison the cat. TBH, I would not worry about blanking it if you have removed the cat. I can't see that it would have any detrimental effect.

 

[Legoman]

cool thanx for your answer , wasnt sure how the system worked , the blanking plug is about £2 , but if thats all it does like you say then its pointless removing it as it wont effect the performance or anything , only the emissions at start up i guess which isnt a bad thing.

 

[Legoman]

on the performance issue , would a stuck open thermostat which stopped car reaching full temp restrict the performance on a mercedes? i just replaced it today , now it runs up to full temp nice and quick (87'c) and hopefully seems to of sorted airlock issue in heater matrix , the old one was not only fubar it was so badly stuck in the casing i ended up removing it in three bits lol. replaced with mercedes original part ofc