savage bulldogs Posted November 27, 2019 Share Posted November 27, 2019 Afaik a blobeye wrx will have 3 "cats" Pre cat in the up pipe ,this goes between headers (exhaust manifold) and bottom of the turbo . Main cat (in the downpipe),this goes from the turbo to the center section. Secondary cat , this is in the centre section of the exhaust . If the code is o2 on just 1 bank ? It's more likely to be a sticky tgv (tumble generator valve) than a o2 issue .as a stuck tgv restricts the air flow into the head , causing air fuel ratio (o2) readings to be out . So just double check it's a o2 problem code and not a out of parameter 02 reading on 1 bank before you buy anything bud Quote Link to comment Share on other sites More sharing options...
stuartie Posted November 27, 2019 Share Posted November 27, 2019 26 minutes ago, savage bulldogs said: Afaik a blobeye wrx will have 3 "cats" Pre cat in the up pipe ,this goes between headers (exhaust manifold) and bottom of the turbo . Main cat (in the downpipe),this goes from the turbo to the center section. Secondary cat , this is in the centre section of the exhaust . If the code is o2 on just 1 bank ? It's more likely to be a sticky tgv (tumble generator valve) than a o2 issue .as a stuck tgv restricts the air flow into the head , causing air fuel ratio (o2) readings to be out . So just double check it's a o2 problem code and not a out of parameter 02 reading on 1 bank before you buy anything bud Well there you go savage i'm glad some one with a bit more knowledge than myself has had something to say on this, like i said previously i don't know alot about newage stuff, everydays a school day 🤣👍 1 Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted November 27, 2019 Share Posted November 27, 2019 I haven't posted much on this thread as you boys seem to be on the ball . I'm not 100% sure about the secondary cat as my bug sti had a aftermarket system. Just thought I'd pipe up as I know that a single bank o2 sensor code is more likely to be a tgv issue . If the garage has just read the code rather than interpreting the code it can easily lead to thinking it's a o2 or cat issue . Plus it's far more common for the Tgv's to be at fault than the cat failing. Quote Link to comment Share on other sites More sharing options...
stuartie Posted November 27, 2019 Share Posted November 27, 2019 I had actually forgot about those tgv thingys, i've seen folks on here on about them fecking up before 👍 Quote Link to comment Share on other sites More sharing options...
Siluro Posted November 27, 2019 Share Posted November 27, 2019 A bit late but does this help: https://scoobyparts.com/blog/subaru-impreza-turbo-exhaust-system-with-diagram/ Yes that is fooking stupid place to put a cat in front of turbo. TGV all they do is work on cold start too pia. Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 27, 2019 Author Share Posted November 27, 2019 Cheers savage I'll have a word tommorow about it an find out exactly what that code is, would the tgr being sticky cause any symptoms? Apart from air fuel ratio? But by what he was saying about that section of exhaust it wants replacing anyways Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 27, 2019 Author Share Posted November 27, 2019 Yeah that makes more sense siluro that's more in Lehman's terms for newbs like me 👍 Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 27, 2019 Author Share Posted November 27, 2019 Still none the wiser today not heard anything Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted November 27, 2019 Share Posted November 27, 2019 I've only ever owned a few classics and a v7sti , none of them have Tgv's, so can't speak from experience. The Tgv's or tumbler generator valves are flaps that are supposed to make the air entering the heads "tumble ". To help the air a fuel mix better ,giving a cleaner burn during cold start enrichment. So if they stick or the solenoid that operates them is faulty , the flaps (or butterflies) can block the air entering the head on that side (bank) of the engine. Think other than a bank lean or rich o2 code, its likely to cause rough idle (hunting) and maybe stuttering or hesitation on boost . Just thought it would be worth mentioning ,as it's a common fault on bug onwards WRX's classics and sti's don't have Tgv's by the way . Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 27, 2019 Author Share Posted November 27, 2019 Yes any help is greatly appreciated hopefully it's not the case cause I dont know if I'd hafto take it to a specialist to look into that? Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 27, 2019 Author Share Posted November 27, 2019 Would holes in the secondary cat cause an 02 code? Quote Link to comment Share on other sites More sharing options...
Siluro Posted November 27, 2019 Share Posted November 27, 2019 Only if holes are before the sensor. You can get tgv delete kits or modify them yourself. The engine light would then need deleting from the ecu software. None of wish I have done. Delete kits are probably expensive. If there are similiar to a egr valve I bet it is a solenoid seized. No idea if they are serviceable though. Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 27, 2019 Author Share Posted November 27, 2019 So their is a sensor in the secondary cat is that right? Apparently theirs a fair few holes in it so probably likely Quote Link to comment Share on other sites More sharing options...
Siluro Posted November 27, 2019 Share Posted November 27, 2019 2 minutes ago, Daryl said: So their is a sensor in the secondary cat is that right? Apparently theirs a fair few holes in it so probably likely Ahh that I am not sure of without looking. Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 27, 2019 Author Share Posted November 27, 2019 ❌❌❌😆 Quote Link to comment Share on other sites More sharing options...
ROSSCOSM Posted November 27, 2019 Share Posted November 27, 2019 There is a 02 sensor in the secondary cat yes Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 27, 2019 Author Share Posted November 27, 2019 11 hours ago, stuartie said: What part of the exhaust is actually fooked mate and phone luke at icp for the gaskets he will sort you out right away 👍 Do you have his number mate or where can I find it? Quote Link to comment Share on other sites More sharing options...
stuartie Posted November 27, 2019 Share Posted November 27, 2019 Go on to their website the phone number will be on there and i had a wee look at that link @Siluro put up and i bet the actual cat is ok its just that short bit of pipe thats holed Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 28, 2019 Author Share Posted November 28, 2019 I've just realised what you meant by icp😂 right give them a call this mornin, so can you get just a short piece of pipe to put in that would involve cutting an welding wouldn't it? Quote Link to comment Share on other sites More sharing options...
stuartie Posted November 28, 2019 Share Posted November 28, 2019 https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F193169929211 could this be the right part 👍 Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 28, 2019 Author Share Posted November 28, 2019 Update gents got a pic of the fault👍 centre piece is cooked just seen it, any suggestions on centre pieces? Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 28, 2019 Author Share Posted November 28, 2019 Quote Link to comment Share on other sites More sharing options...
stuartie Posted November 28, 2019 Share Posted November 28, 2019 I would say looking at that that it's what savage said about the tgv thingys, i would assume they are stuck or the solenoid is goosed pal 👍 Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 28, 2019 Author Share Posted November 28, 2019 Gutted take it those codes wouldn't suggest it could be the holes in the exhaust, Gonna have to sort the centre section anyways, what a swine. Is it hard to put right? Quote Link to comment Share on other sites More sharing options...
Daryl Posted November 28, 2019 Author Share Posted November 28, 2019 Had a look for different centre sections found this on offer? Should fit shouldn't it? Quote Link to comment Share on other sites More sharing options...
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