Hy guy's and gals. I am wondering if any one can help wth a little problem? The thing is that I have just had a cel light come on and go off again. I have had this happen a few times but it has never stayed on and the car is running like normall. My brother in law has owned scoobies in the past and like him I am running a kn intake. He told me that sometimes the oil can get on to the MAF and start to cause problems. So we took the MAF out of the intake and cleaned it down with brake cleaner. I also changed the fuel filter and the car does seem to be going better than normall. The cel light had not come on for a couple of days aprt from this morning and after a minuit or less went out with no problems i.e. car going into limp mode. Any ideas Oh and by the way I am looking forward to speaking to you all cheers.

 

hello and welcome ..
check you ecu for faults(2 black connectors under the stearing colum). search ecu reset/ecu fault codes there is loads off info on how to read the codes and how to reset you ecu

 

Hi. I reset my ECU by taking off the neutral, is that any good

 

Try this..

Turn OFF the ignition

Connect Error code Connectors and Test Mode Connectors :
2 black connectors under dash, connect black to black and 2 green connectors under dash, connect green to green, they are by your left knee when sat in the drivers seat and often taped back to the loom if they haven't been used before.

Turn ON ignition but don't start the engine

Engine Check lamp comes on

Press accelerator pedal to the floor

Then return it to the half-throttle position and hold it there for two seconds

Release foot off the pedal completely

Start the engine

Check engine light error code is indicated by Pulsing lamp

If an error is detected then Check the ECU Code

If no error is detected - drive the car sensible for a couple of minutes
i.e. until warm (do not use boost or high rpm!)

When the ECU has been reset the Check Engine Light will flash

An Error Code is indicated by a flashing check engine light
of varying length of flash,
a flash of around once a second is the okay code and indicates all is well.

If an error code is detected Check the ECU Code

Turn ignition OFF and Disconnect Connectors

If there is a fault Check the Appropriate Sensor



Error Codes
An Error code is defined as a slow flash followed by fast flash
i.e 2 slow and 3 fast = 23 Mass Airflow sensor.
A continuous on/off at the same speed is no fault found.


Code Fault
11 Crankshaft position sensor

12 Starter switch

13 Camshaft position sensor

21 Engine coolant temperature sensor

22 Knock sensor

23 Mass air flow sensor

24 Idle air control solenoid

31 Throttle position sensor

32 Oxygen sensor

33 Vehicle speed sensor 2

35 Purge control solenoid valve

42 Idle switch

44 Wastegate control solenoid valve

45 Pressure sensor / Pressure exchange solenoid valve

51 Neutral position switch

 

or disconnect the battery for 10 min worked for me

dont reset b4 you have checked for faults or you will lose them

 

Wait for the cell to show again, then read the codes as per above. Hopefully there will be a fault code to highlight the problem..

 

Thanks for the reply guys. I will try what you have suggested. Is there any truth about the oil on the kn, is the kn any good for my setup. The car was put on the rollers last year and hit 300Bhp. Any advice would be welcome.

 

Personally I'm not much for the oiled type but each to their own.

 

Also the cel does not stay on and it has not happend every day. It has only come on when I first start it and stayed on for only a about 30 secs. I am wondering if the MAF is on its way out.

 

Try the codes first bud..

 

No worries, just worried is all. You all know how it is, when some thing like this happens to the impreza I feel like a family member is ill

 

same problem i had before and once you check the code. normally that sensor is on it ways ou already same problem i had before n my maf is stuff

 

Sorry to drag this thread back up but I am having some probs with my ECU I think!
I have just changed mine on my 93wrx import and reading the above, I don't have an engine check light that comes on I have done the rest as directed in post #4. I did also have my battery disconnected for about 30mins to 1hr. I havn't been out in it yet though!
Have I got probs without the engine check light or could this be ok??

Thank you.

 

check the ecu for any chip in it. I have encounter before some race box that doesnt run the o2 sensor hence the check engine light is always on but cars runs fine

 

The ECU I bought is supposed to have a chip in it! he chip is from Polar Performance

 

Any help what-so-ever would be good!

 

When you did the ecu reset did the CEL flash ?

 

Not sure what that is I'm afraid But, nothing flashed what so ever. The only lights I get on my dash are: Oil, battery, handbrake, door open and seat belt! So tbh I am not sure what other lights there are and where they are on the dash

 

CEL is the engine check light, It should come on when you do the ecu reset. sounds daft but check see if the bulbs has gone !

 

I wonder if it has actually been disconnected as there is no sensor for the exhaust! So that could be a reason it don't work