scoobyhep

As above really.

1993 WRX, De-catted but I beleive its pre-cat year.

They say there not sure whats causing it, any of you guys got any ideas.

Turbo is slightly smokey on start up.
New lamda has recently been fitted, just been serviced.

Ian

satancom

If its a 93 it doesn't need a cat

scoobyhep

Yes, but they say it still needs to pass emission test.

They say there going to try and tweak it but I can't see/think how

92typeRA

give the guy £10 and get him to stick the tester up the tailpipe off the astra sitting next to in the garage

Gear Head

iTrader: (2)

lambda sensor could be fubar'd.

myblackwrx

iTrader: (1)

Right the car doesn't need a cat BUT did the garage test it as a non cat test?

Perhaps posting your results up may help.

Or as Chris says the new sensor may be fubar

172sport

iTrader: (6)

Right, list the emission test results then to save all the guessing about which part it failed on.

satancom

Had a V6 omega pass emissions running on 5 cylinders before.. Tester just disconnected the rpm sensor and reved the nuts off it for about 30 seconds

It was a hunk of scrap btw

amahrap

you need to post the actual emmisions (this will be on the computer printout that they should have provided you)
There are only a handful of reason why you may have failed and the data will point to the correct answer

Shark Man

Aye, it can fail on emissions if the engine wasn't running

Seriously, even something as silly as a unseen hole or crack in the exhaust can cause the engine to fail the emissions (excess oxygen).

wrxmad

as above,
hi bud .ive a 93 same as yours..took car for mot..failed on same problem engine was lumpy..sorted it by regapping the plugs back to 1.1m as in the subaru manual ...was told it was not burning the fuel properly. has soon as i regapped plugs engine was no longer lumpy took it back ..tested again ...result passed 137. hc ..before it was ...3800 if i was u regap ur plugs to 1 mm. good luck guys.


most subaru owners gap to 0.6 or 7 m on ngks..for higher boost which is too
small a gap for the fuel to burn..properly in the engine . ive heard so many with emissions problems at mot time . just try it ..

m_reed1

Hya,

jusst thought I would jump in I have a 1994 wrx at the moment this has no cat been told it dos'nt but does it?

Thanks mark

myblackwrx

iTrader: (1)

As standard it will have a cat in the downpipe (that's the only one).

Have a look at the back of the engine and if there is a ribbed bulge in the downpipe it still has the cat.

daveh74

The MOT rules state ALL vehicles regisered after 1st of August 1992 a lower emission level is tested except ones listed on a VOSA booklet ( all cars need a cat to pass these levels whether standard or modified )

500

Not if it's an import

daveh74

even if it's an import, it comes to this country and it has to pass our laws if you want to use it on the road

myblackwrx

iTrader: (1)

http://www.vosa.gov.uk/vosacorp/repo...01992-2002.pdf

If you cannot find a direct match then you give it the BET therefore complying with the rules.
They don't need a cat, they need to pass emissions (and that normally means they can only do it with a cat) unless i'm mistaken.

Shark Man

It can STILL fail on the pre 1992 test (or 1996 for unlisted import cars). They are still tested but to with higher set limits. Which it can still fail on.

If the car has a catalyst fitted. It doesn't matter, it should pass the stricter test with ease: If it can't, its an obvious sign the engine is not running properly, and needs attention.

EVERY Impreza manufactured since 1992 is capeable of passing the lower emissions test in stock factory trim. So it should easily pass the stricter test even if it applies or not. (unless the cats have been removed: in which case forget it )

scoobyhep

All cats removed. 3" turbo back. Induction. It passed last year at the same MOT Station. I'm starting to think they just overlooked it now. I de-catted beleiving you did not need a cat with it being a 93.
Can't see how I can get it through without a cat.
Rather not bugger around fitting a cat only to remove after MOT

Shark Man

Well, seeing its an import and its had the cats removed, you do need to make sure it has had the less-strict test. Because otherwise it definetly won't pass.

(Max CO limit 3.5% instead of the 0.3% CO limit for the stricter test.)

The emissions print-out will show what limits its been tested to.

It's quite easy for a tester to inadvertantly to test the car as a UK car (as there are so many impreza models listed). And thus test it to the stricter 0.3% CO limit. If it did have the cats fitted, it should pass the stricter 0.3% CO, even if it doesn't need to.

scoobyhep

I will try and get the figure from the test centre tomorrow. I git the news by phone so don't have the print out with me.

Will let you all know.

Thanks
Ian

scoobyhep

I got the the figure just now.

The reading is 600 and the limit 300 so its twice the emissions

172sport

iTrader: (6)

It sounds like HC to me. I think one of the following , worn engine(rings), blocked breathers, valve stem seals etc etc. Must be using oil?

scoobyhep

Using a bit of oil but new engine still running itself in.
Got a code 24 on the ecu? Idle air controll solenoid but its been cleaned twice.
Not yet done ecu reset though.

Blocked breathers ?

The garage told me to take it to subaru as they don't have the correct diagnoses software to detect the problem. I doubt subaru will help though as its an import..

Shark Man

If its HC then that's the stricter test: the more relaxed test has a 1200ppm limit. A healthy car with a cat will usually get below 50ppm. 500+ppm on a non-cat car is not usually abnormal.

HC is hyrdrocarbons. This can be caused by unburnt fuel from inefficient combustion or oil burning.

It's possible to get below 300ppm without a cat, but its harder, the engine will have to be running 100% spot on and be very hot when tested.

HC is most often from unburnt fuel. This can be mixture (lean or rich)...but you need to oxygen readings AND the CO AND the lambda results as well to be sure and rule that out and point the finger elsewhere. Such as ignition system, timing issues or oil burning.

DaveD

iTrader: (2)

Hopefully not a silly question, but, is the engine warm when it's being checked?

My local MoT station is 5 min walk away, so I take the car for a 10 min drive before taking it to the garage to make sure everything is warmed-up. Otherwise they're testing it to the wrong limits or something is seriously amis with the running of your engine.

It passed 2 weeks ago with no cat, and currently no lambda sensor. It's running a ScoobyECU, however. 1993 WRX.

scoobyhep

I'm going to pick up the certificate tomorrow so will check it plus I will ask them what limits they are using etc

What would the give away if the engine was so bad???

Idling is fine, boost is fine, no hesitations, no pops/bangs, does'nt smell too rich.....
Is very smokey on start up though but think it could be the turbo.

Could it be that

JOKER.STI

HI ALL

MY EMISSIONs ar 0.56 for the MOT and it should be 0.20... yea right i have cat fitted any ideas on
lowering them just for the MOT thinking Lamba Senser RV on the switching wire
>????