wiseyd

Hi

I was wanting to change my plugs on my impreza, cause i had them changed a couple of months back in a mini service and the car has been idling lumpy, running rich and back firing. I changed the maf sensor on it and it wasnt that, and some of you said it could be the plugs or leads. Is it hard to do, as it looks pretty cramp in the engine bay. I'm not sure whether to just change the plugs and leads to be done with it

Any advice would be helpful

Thanks

clark822

Yeah tight but not bad i take airfilter box and washer bottle out and also have a uj on the extension bar i use and takes about 30min all in

kevin wrx

iTrader: (1)

if your in essex i no a garage that can change your plugs cheap

sponners

iTrader: (4)

check output voltage on the lambda?

lee rb5

i had the same problem the other day, changed the lambda sensor and now its fine.

99greenwagon

iTrader: (39)

could be that the plugs were not gapped correctly/at all?

sean whiffin

iTrader: (2)

i changed the water temp sensor on mine and that stopped the lumpy running on start up .

Jam Performance

iTrader: (3)

As its a MY99 car you should be able to find the fault using a simple obd code reader via the obd2 diagnostic port, most garages have these and shouldn't charge alot for a simple diagnostic, you could save yourself alot of money rather than guessing and changing a load of sensors...

Splitpin

No you won't. MY99-00 cars have the 16 pin socket but aren't fully OBD2 compatible. Only way to diagnose them electronically, beyond the read memory connectors and the CEL light flash sequence, is via something that speaks the Subaru specific SSM protocol. Generic code readers don't work.

Certainly worth having it checked via this method - should implicate/eliminate the O2 sensor at very least.

Aztec Performance Ltd

iTrader: (234)

The symptoms sound like a Lambda sensor. Fuel economy would also be pretty poor.




AZTEC PERFORMANCE ONLINE STORE - WHOLESALE PRICES DIRECT TO THE PUBLIC - Lambda/Oxygen Sensors :: Lambda/Oxygen Sensor - Subaru Impreza Turbo (Inc WRX, STi)

danny c

iTrader: (6)

lambda sensor,had exactly the same problem with mine couple months back!!

tjmatt

iTrader: (1)

If you want to do your own diagnostics you want something like Rom Raider (works in logger mode only) and a £13 VAG COM (usb to obd2) type cable. 99-00 cars talk "SSM" over the obd2 K line and the VAG COM cable I have works a treat. Can log everything you'd need including lambda voltage and the AFR adjustment percentage as a result of a dead lambda.

his-n-her-scoobs

iTrader: (5)

Tell me more. Can I do this on a UK MY97 with a Prodrive ECU?

Splitpin

No, you can't do it quite the way Matt has, as the 97-98 cars have a different electrical interface and use an earlier version of the SSM communication language. However you should have a word with L3YMS, as he's doing it - with EvoScan from what I recall.

wiseyd

Is it hard to fit the sensor and where abouts is it located in the 99 uk turbo? Thanks

Aztec Performance Ltd

iTrader: (234)

Top of the downpipe. Quite straightforward.