On CO %vol

Fast idle

CO 1.235 Max limit 0.200
HC 56
Lambda 0.986

Second fast idle

CO 0.851 Max limit 0.200
HC 63
Lambda 0.997

Natural idle

CO 0.611 Max limit 0.300


Any suggestions?

 

2.5 if I'm correct..............head gasket/piston ring failing

 

more details required
cat/sportscat/ no cat
standard ecu/mapped ecu/aftermarket ecu

 

all standard, all Cats present

only thing that is not, is the PO fitted a Japspeed cold air intake, however this has not caused an issue for the last two MOTs

 

was expecting that reply... or " should have bought an STi"

 

Knackered lambda

 

That was my first reaction, but it been replaced in the last year and he said all the reading from the Lambda are spot on...

 

Just check it all,lambda,air filter clean,air leak somewhere even spark plugs but I doubt it would be that.

 

I assume it's a denso lambda and not a cheapo jobbie?

 

They are going to take it for the day and sort it tomorrow.

Plugs are 6 months old, air filter replaced last week.

so Lambda, leak will be prime suspects....

MAF ????

 

Yeah its a Denso, had a couple once...just like MAFS lol

 

If it was a non genuine lamb sensor, my money would be on that. They just don't last.

 

Grrrr bloody maf!!
Unlikely though I'd say

 

What was the oil temeprature? It "should" be measured for the MOT test (although can be bypassed).

Has it had an Italian tune up immediately before the test? Or was it just left idling to get up to temeprature?

The latter will gaurantee a fail on a scoob.

 

It had a 50 mile run before the test, but then had to wait 1/2 hour before emmisions test so had cooled down alot

 

pre turbo vac leak. I'll wager a shiney penny.

 

As the Lambda reading is good, I'd look at possible cat failure. However first I'd try some fresh VPower followed by a damn good thrashing with emissions tested immediately after, without standing for half an hour.

 

Sounds interesting, where would I look for pre turbo leaks

 

follow the turbo turbo intake pipe - look for all the vac lines coming off it and check to make sure they are connected on both ends

 

Cat isn't hot enough, Noticed on the 2nd fast idle it had come down a touch. cats getting hotter. the cat is likely to be a little less efficient over the years, or it just stood to long

 

I've put a car through the mot before with a barely warmed cat, 95 fuel etc. that on its own doesn't usually lead to the car being quite a bit over the thresholds. To fail emissions, there is usually something more physical like a split vac pipe/loose from solenoid etc or in the occasional case a dud sensor.

 

With most cars, especially newer ones they easily pass MOT emissions with a cold engine. Old/ageing scoobs on the other hand its s different story. Especially if it's had one of the two cats removed or has a non-genuine cat (which definetly have shorter lifespans). Which is very often case as these cars have often been through at least several owners and the current one may not know what's been messed with in the past.

 

Well its just gone back in to see what they can do.. find.

fingers crossed

 

Just out of curiosity were your 2 previous MoTs done at the same place/same tester? I know it shouldn't make any difference, but you never know

 

Yep, always done at Orbit in Rushden...

Anyhow, just had a call

It's Passed

Off to pick it up now

 

Glad to hear that Paul. Make sure you ask them what they had to do to get a pass.

 

yeah aside from charging you a small fee no doubt!

 

Heat in the CAT, took it for a run first

 

Nope

 

glad to hear it! Far too many hoods out there trying to get a double dip in your pockets for horsing you car around the countryside