bigscoobydave

hi all ive just brought a uk 2000 subaru impreza 2000 plate and i have an issue where when i driving the car the management light comes on and of in no sort of pattern and under load it feels light it missfireing and loosing power and somtimes in short spurts if goes really well but not very often ive changed the air flow meter and done the plugs and no differnce it really starting to drive me mad lol if anyone has had this problem or knows wht it is please let me know many many thanks dave

richgreenscooby1

iTrader: (2)

What code is it showing ??

zippy!

iTrader: (1)

possibly an air leak my turbo 2000 did similar thing when on boost turned out the turbo pipe was split. could be wrong but worth checking

alcazar

iTrader: (2)

find out what code it's displaying, then ask again

Each LONG flash = 10, each SHORT flash = 1.

So two long, three short = 23, etc.

bigscoobydave

thanks for the quick replies how do i do a code read on this model many thanks

Tommy2396

As Zippy said could well be leaky turbo pipe. Quite common

albob

on yr model u can only do it 'manually' !! info here ----



http://www.scoobypedia.co.uk/index.p...eadingECUCodes

bigscoobydave

ok thanks i will try code reading in the morning and i will check turbo hoses aswell and let you guys know wht i find cheers for the advice

bigscoobydave

right guys i done a code read and says 22 which is knock sensor but it has had on recently buy the previous owner so im confused lol is there any obvious reason why it would say knock sensor like somthing else that would bring that fault up cheers

BrownPantsRacing

iTrader: (6)

I'd change it if the error code points to it then do an Ecu reset.

bigscoobydave

Would a knock sensor cause the problems I'm getting?

RICHARD J

iTrader: (4)

Mmmm perhaps the knock sensor is faulty,but it may be an old code or perhaps the code has come up because your ECU is detecting knock. What fuel are you using & what mods have you got is it mapped etc?

bigscoobydave

Hi mate it got full exhaust system air filter and bailey dump valve all on it when i got it but like i say it got this loss of power and missfireing feeling underload I've done air flow meter and them checked codes and got the 22 knock sensor I done ecu reset but still same

mickywrx

iTrader: (29)

Get it checked out properly!

If it's pulling up a knock sensor fault, then you need to sort that out. Don't believe that everything any previous owner has told you is true.

It could well be detting it's tit's off. Bye bye pistons if so.

lamby2k12

i had the same prob;em other week but no down on power atall.... i changed my knock sensor but didnt need to reset ecu the cel went off straight off an did anothe check on the cel and came back clear... i dont think your knock sensor is faulty i think internally is your problem i would agree with mickywrx

alex

RICHARD J

iTrader: (4)

Probably never mapped for mods. Drive it off boost until you get it looked at by a respected mapper or else you may need a rebuild when your engine distroys itself.

bigscoobydave

now i really confused cause i had a uk 2000 bout a year ago and i had full system and front mount and dump valve and pump and reg and headers and not mapped and it run fine and this had hardly naf all on it i just want to know really if the knock sensor is faulty will it cause a bad running problem?

lamby2k12

possibly the knock sensor picks up unregular noises..... wich then will tell the ecu wich conteracts with fuel air to not prevent damage....
correct me if am wrong

lamby2k12

hi mate just found this on the web i was rite lol

It allows the engine to run with the ignition timing as far advanced as possible. The computer will continue to advance the timing until the knock sensor detects pinging. At that point the computer retards the ignition timing just enough for the pinging to stop.

A knock sensor assures that you're getting as much power and fuel economy as is possible from your engine.




The knock sensor responds to spark knock caused by Pre-detonation of the Air/Fuel mixture. As the flame front moves out from the spark plug ignition point, pressure waves in the chamber crash into the piston or cylinder walls resulting in a sound known as a knock or ping. This is caused by using a fuel with a low octane rating, overheating, or over advanced timing. Sometimes it can be caused by hot carbon deposits on the piston or cylinder head that raise compression. A knock sensor is comprised of Piezoelectric materials; Crystals that when impacted, generate a voltage (same idea as a BBQ ignitor). This voltage is monitored by the computer, and when an irregularity is detected, the computer corrects timing in VVT (variable valve timing) engines, or triggers a DTC Diagnostic Trouble Code) in older vehicles.



HOPE IT HELPS!!!

maydew

iTrader: (9)

maybe fuel pump, would get a well known mapper to check it over rather than play guess the faulty part as all parts work in sync together ie if the pump was failing and running weak could cause other senors to throw a cel light but not necessary the main fault