205 Gti6 Mot....

[M@tt 77]

My 205 GTI6 passed the emissions fine at it's MOT. It's not got a cat on it. I'll see if I have the sheet for it when I get home tonight to see what the readings Were.

[jonnie205 1]

no need for the cat for an mot on a gti6, if you wnat to run a cat then the 306 cat and downpipe will fit fine then just mate your system up to that

[BuD 0]

cheers for all the help - will report back

[r.u.sure 0]

Sorry only just found this topic

 

I'm running a Gti-6 without a cat, car was MOT'd in August, here's my figures for you

 

Fast Idle CO 0.01

Fast Idle HC 12

Lambda 0.999

 

Hope they're of some use, Sorry can't shed any light as to what's causing your problem, hope you get it sorted though.

Edited October 16, 2008 by r.u.sure

[ablister 31]

With the emissions fluctuating by 2% odd I would say that there's a problem unrelated to the lack of CAT, but having never checked the emissions on a known-good GTi-6 without a CAT it's hard to say - certainly the fluctuations don't sound at all right though.

 

why not?

 

emissions never stay at one reading, they are constantly changing.

 

They can stabalise to within a small range but can take a few attempts to get there

[shooter mcgavin 37]

why not?

 

emissions never stay at one reading, they are constantly changing.

 

They can stabalise to within a small range but can take a few attempts to get there

 

 

just got my 205 gti6 engine checked all ok without a cat fitted,c.o level 1.37%,h.c level 204ppm,lambda 1.02.def doesnt need a cat fitted,have you definatly checked inlet,hoses,gaskets with carb cleaner to check for a leak,ma local tester says sounds like an air leak somewhere . just a thought,youve not blocked off the pipe for your charcoal canister have you?on your emmissions sheet does it say fast idle,if so then it is the wrong test as the emmission probe is only inserted after raising the engine speed for about 20 secs then insert probe at idle for a non cat test.can you post the details of the test.

Edited October 16, 2008 by shooter mcgavin

[BuD 0]

just a thought,youve not blocked off the pipe for your charcoal canister have you?

 

Yes I have removed the charcoal canister and left the sensor unplugged, could this cause the problem?

 

Non cat test CO 4.xx to 6.xx limit 3.5%

[Mikey S 29 1 Cars]

Yes I have removed the charcoal canister and left the sensor unplugged, could this cause the problem?

 

Non cat test CO 4.xx to 6.xx limit 3.5%

 

no. the ecu only opens the canister valve at certain times, namely wide open throttle. so it wont affect the emmisions reading at idle.

 

if you have replaced the lambda sensor and checked the coolant temp sensor then i would be looking towards a leaking injector.

 

if you put a cat onto an engine running nearly 6% co readings, it would burn it out in no time.

 

how many different analysers has the car been tested on? even though they are calibrated every 12 months for mot purposes, they can still be widely out.

[BuD 0]

2 seperate test machines have indicated a very high CO reading.

 

All 4 injectors cleaned and flow tested before fitting.

[ablister 31]

if you put a cat onto an engine running nearly 6% co readings, it would burn it out in no time.

 

Why would it burn out if lambda is ok?

[Mikey S 29 1 Cars]

Why would it burn out if lambda is ok?

 

 

you tell me, but i have recently had a 206 quiksilver that was running at 8% co due to a faulty cts that had damaged the cat.

[ablister 31]

the 306 gti management system is designed to have a cat, hence why (i assume) co reading is high without one, and my first post about a faulty cat producing high co approx 4-5%.

 

Bud has also told us that all the sensors are ok: cts, lambda, injectors etc etc

 

Was the 8% reading you measured after you replaced the temp sensor or when it was faulty?

[shooter mcgavin 37]

if it was a leaky injector would that not show up as high hydrcarbon content,as hc is unburnt fuel?if it was me id be double/double checking inlet side for any leaks,also tryin to check the ecu for any fault codes,have you carried out a oil consumption test or a block test yet?if the lambda content was ok then it shouldnt burn out the cat i would have thought as lambda:ie perfect stoichiometric ratio?is lambda 1 or air/fuel ratio of 14.7,have you had your car checked by a competent mechanic or sumbudy thats jist slept wi one?for readings that high you would expect a quik diagnosis

Edited November 1, 2008 by shooter mcgavin

[Spiky 37]

when i took my car for an MOT it was

 

 

CO max allowed was 3.50 mine was 0.61

 

HC max allowed was 1200 mine was 88

[BuD 0]

Its fixed

 

Neil at Des Developments discovered a dry joint in the lambda sensor heater wire inside the loom, this was causing the lambda to respond slowly.

 

Now with this fixed CO: 0.81%, HC: 105ppm.

 

Am very pleased - Big thanks to all who posted to help.

 

Having driven it a bit for the first time I am finding other problems tho - theres a mettalic vibration\belt whine noise that doesnt sound good, also the brakes arent bled properly or there is a leak!! Oh and I need shorter springs for my coilovers.

 

But it does go very well!

[welshpug 1,622]

YAY! I was right lol. shame things like this take so long to trace. I bet with those figures it wouldn't be far off passing a cat test

[CaptainK 11]

Neil at Des Developments discovered a dry joint in the lambda sensor heater wire inside the loom, this was causing the lambda to respond slowly.

Freaky, thats basically what was wrong with mine too - except mine was permanently broken so the lambda wasn't getting heated. Resulted in a lot of kangarooing and strange engine response.

 

Glad you got it fixed though. (mine was fixed yesterday)

[Super Josh 4]

Having driven it a bit for the first time I am finding other problems tho - theres a mettalic vibration\belt whine noise that doesnt sound good

 

That's great news

 

The belt whine noise is usually down to a bearing on it's way out in either the idler or auto-tensioner pulleys. Chap on the 306 forum sells aluminium ones with replaceable bearings for a little less than the OE ones from Pug.

 

 

 

Josh

[BuD 0]

lol and cheers for the tip

[bensonmi 4 2 Cars]

when i worked in an mot station nearly every car that hed a induction kit fitted failed emmisions and the only way they would pass was to fit the standard air box,which was no doubt changed back as soon as it got its ticket! something to consider anyway.