Nomad_72

Nearside rear shock absorber has a serious fluid leak

Exhaust emissions carbon monoxide content after 2nd idle excessive
CO: <0.20%vol
0.51%vol

Exhaust emissions hydrocarbon content after 2nd idle excessive
HC: < 200ppm vol
1285ppm vol

Exhaust emissions lambda reading after 2nd idle outside specified limits
0.970-1.030
1.477

Parking break efficiency below requirements

Where do i start guys? All help and advice greatly appreciated. Tester told me that he thinks there's a slight misfire and recommends a compression test....faulty valve?

prodriverules

iTrader: (52)

A compression test would be a good start mate as the HC is a sign excess/unburned fuel is getting down the exhaust for some reason which would account for the high lambda reading also,get it to a garage and have it done.
Does it feel like the engine is missing or not,does it shake around alot on idle?

Nomad_72

To be honest it doesn't feel like it's missing, had a faulty HT lead last year and it feels nothing like that. Idle is very erratic, dipping to very low revs and then surging to about 2000-2500rpm for no reason. This seems to go away when she's warm so put it down to the aftermarket induction kit (mechanic friend recommended putting a standard airbox on to cure the idling problem)

prodriverules

iTrader: (52)

could be the induction kit,if its the start of a burnt out valve it wouldn't really miss as such and would be very hard to detect.
The only real way to detect is with a leak down test as a compression test unless its very badly gone might not pick up on it.

Nomad_72

Excuse my mechanical ignorance.........leak down test?

prodriverules

iTrader: (52)

No worries mate,a leak down test is where the cylinder is pressurized and then left to see what leak down you have on the cylinders,there should be a marginal amount over a given time but if there was any valves problems this would find it.

Nomad_72

And would a valve problem cause the emissions failure? If so, how big a job would it be to repair it and any rough idea on cost?

prodriverules

iTrader: (52)

A valve problem would cause HC to be high yes as the fuel entering the cylinder wouldn't get fully burned off and be escaping past and down the exhaust.
The cost involved would be alot as the heads would have to come off and have either new valves if there to bad or some decent second hand one's and then all the other parts involved in pulling the heads off like head gasket set,timing belt etc,some where between £800/1200 depending on what was found when stripped down and who does it mate.

Nomad_72

Anything else that could be causing the emissions failure? The only thing i've done to the car since the last MOT is change the back box from a 2.5" bore/3.5" exit to a 3" bore/5" exit.

prodriverules

iTrader: (52)

It could be aslight misfire ie leads,plugs,coil pack as basically high HC is just poor consumption leading to unburnt fuel down the exhaust so something of the above is causing fuel to be unburnt.

Nomad_72

I better start eliminating the suspects then lol! Let's hope it's one of the above. Thanks for the help mate.

Steve001

iTrader: (7)

get the read to see if there are any fault codes, have you noticed engine light come on at all?

The Trooper 1815

iTrader: (31)

Idle dip and surge sounds like a MAF sensor. Quick check is to start the car. Unplug the MAF and the engine should cut out, if not the ECU is compensating for the Fooked MAF.

Nomad_72

Not had the engine light come on at all in the 3 years i've owned the car.

Nomad_72

Thanks for that Ian, i'll check that in a while if this rain ever stops! Could a faulty MAF be responsible for the emissions failure?

The Trooper 1815

iTrader: (31)

It may contribute to the problem of fuel. If the air flow is not correct then the fuelling will not be correct.

Just a thought.

Nomad_72

Excuse my ignorance Ian....................is this the sensor i'm unplugging?

wrx287

iTrader: (8)

Thats not the MAF. Do sports have them If so it should look like a tube with a sensor in it.

Nomad_72

Whereabouts would it be Calvin? Praying to the big man that it's something simple, otherwise this could be the end of scooby ownership for me

wrx287

iTrader: (8)

Just after the airbox. You got the same mobile number? Will send you a pic of the one i got in the shed.

Nomad_72

Yeah same number, cheers mate.

The Trooper 1815

iTrader: (31)

Doh! Sports don't have them.

wrx287

iTrader: (8)

Not that then Didnt remember seeing one on a sport.

Nomad_72

Oh well, back to the drawing board. Compression test first i think. Anyone recommend a good scooby friendly garage in the llanelli/swansea area to get it done?

old school pete

sorry to jump on this thread but new to this and cant find how to start a new one !

my99 turbo failed the mot this week on emissions

not really sure what it all means and am after some advice before randomly throwing money at things!!

fast idle
co 3.93
hc 197
lambda 0.88

second fast idle
co 4.16
hc 165
lambda 0.87

sorry again, but dont know what to start changing, any advice very welcome

thanks

The Trooper 1815

iTrader: (31)

Clasic UK Turbo and Newage Sports are a different ball park.