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Author Subject: Decat results ?
beez_neez_gt

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Post #1
Hello,

Would a decat cause the CO to go up to around the 7.3 mark or could there be another problem thats causeing this high reading ?

Cheers



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Posted 19th May 2013 at 00:33
calibra306

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Post #2
That sure is high as it should be under .3

My old system went well over the limit but then the lambda would kick in to late and then the reading would go down but still kept failing emissions due to it going over instantly.

Im guessing until the pressure built up for the sensor to read emissions where if you have a cat the pressure is there trying to get through it.

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Posted 19th May 2013 at 00:59
aaron6

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Post #3
My bird had a shot cat and it was about that so id say thats normal.

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Posted 19th May 2013 at 01:31
stan_306gti6 Forum Admin

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Post #4
Well, that sounds like a typical high reading when using a decat, so I'd say yes.

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Posted 19th May 2013 at 07:50
coskev

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Post #5
LOL
No way is that due to a de-cat!!!!No
That is down to a knackered sensor, coolant temp probablyWink
That level of Co will give you bore wash, and glaze the bores if your not carefull.
My rallye with a de-cat fitted nearly passed the mot on emissions, just slightly to high.

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Posted 19th May 2013 at 09:28
welshpug!

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Post #6
Yep, my 205 runs at 1.5% co without a cat.

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Posted 19th May 2013 at 09:39
stan_306gti6 Forum Admin

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Post #7
Doh

I read that as .73...

As Coskev says 7.3 is far too high and will cause issues. Yes

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Posted 19th May 2013 at 10:07
swiftyboi006

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Post #8
7.3 how the f**k do you have satan breathing out your pipe

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Posted 19th May 2013 at 10:42
beez_neez_gt

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Post #9
So would you suggest i get a new temp sensor and a lambda then go get a quick emissions test somewhere local to avoid anymore mileage than i have too?

So what is the limit of CO with a cat and without a cat ?

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Posted 19th May 2013 at 11:20
welshpug!

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Post #10
you can test them, see the FAQ.

with it running that rich it's probably running like a bag of spanners, so when you replace the faulty item it should be quite evident LOL

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Posted 19th May 2013 at 11:23
beez_neez_gt

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Post #11
Tbh the engine sounds and goes very well, ill replace the temp sensor first.

Cheers.

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Posted 19th May 2013 at 11:26
beez_neez_gt

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Post #12
I havent got one of those testers so is there any other way of testing it ?

They are cheap enough though so ill get one anyway and hope the rich wont damage the lamda.

Saying that though the engine on ide or start up did cut out twice.

Also the engine did overheat a little bit when i had an air lock which is now sorted out, would that do any damage to the CTS?

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Posted 19th May 2013 at 11:57
coskev

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Post #13
Should not damage the ctsNo

Co should be below 0.5 on a cat equipped car, below 3.5 on a pre-cat carThumbs up

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Posted 19th May 2013 at 12:42
beez_neez_gt

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Post #14
Ok thanks Kev, the idle seems fine and around the 8.5mark. Although on cold start up it doesnt seem to go any higher up and as its garaged thats warm i thought thats why it wont choke up on cold start up but it must be the CTS.

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Posted 19th May 2013 at 12:47
beez_neez_gt

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Post #15
As said i could not remember if i did buy a new ECU temp sensor and iv just found i did as i did a thread about buying one earlier this year LOL

So it looks like the lambda is at fault ?

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Posted 20th May 2013 at 09:56
welshpug!

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Post #16
yeah but did you fit it?...

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Posted 20th May 2013 at 10:08
beez_neez_gt

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Post #17
Yes i bought a few other bits from pug inc 205 thermo red sensor and all were fitted at the same time.

Is it possible its a faulty sensor, i guess it could be ?

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Posted 20th May 2013 at 10:16
welshpug!

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Post #18
unlikely but easy to check.

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Posted 20th May 2013 at 11:14
beez_neez_gt

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Post #19
Yeah easy if you know how to use a multimeter and actually have one to use LOL

Surely if the idle is fine except not going up high on start up the sensor would be fine ?

As said it has cut out on me a few times on start up but then i restart it up and it works fine, so intermittent.

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Posted 20th May 2013 at 11:30
beez_neez_gt

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Post #20
Its ok guys, mot sheet has some sort of typo as mot man cant understand why its there as no emission test was done as had problem with car being a cat or non cat car etc ???

Was told id have black smoke and engine would run really badly and since it dont all is fine.

Have to cancel new lambda sale now i think, save some cash for fuel lol.

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Posted 20th May 2013 at 18:13
beez_neez_gt

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Post #21
Just had it tested and CO came out as 0.410 which is very good. All passed now Big grin

Cat is supposed to be below 0.2 BTW Kev.

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Posted 21st May 2013 at 15:40
stan_306gti6 Forum Admin

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Post #22
Excellent result then. Thumbs up

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Posted 21st May 2013 at 16:46
beez_neez_gt

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Post #23
Yep, it was my mistake the 7.3 on the mot fail form is the mot sub section number about the cat opps lol.

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Posted 21st May 2013 at 16:58
stan_306gti6 Forum Admin

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Post #24
beez_neez_gt wrote:
Yep, it was my mistake the 7.3 on the mot fail form is the mot sub section number about the cat opps lol.


LOL

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Posted 21st May 2013 at 17:00
beez_neez_gt

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Post #25
Stupid form should not say test, 1st test n 2nd test LOL

I canceled the lambda now before they posted it.

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Black 306 GTI 6 Standard, was 60k mileage, bargain!!

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Posted 21st May 2013 at 17:51

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