1999 Forester S Turbo - problem at 2700-3500 rpm
Thread Starter
Scooby Newbie
Joined: Oct 2004
Posts: 7
Likes: 0
1999 Forester S Turbo - problem at 2700-3500 rpm
Hello I'm new here, but have had a look around and it seems likely that my problem may be MAF sensor and/or Lambda Sensor -- any advice gratefully received ....
I have just bought the 99 Forester Turbo with 84 k with a good(ish) service history ( mostly Subaru dealer or specialist). Seems to be suffering from a lack of power/hestitation/misfiring/flat spot (don't know quite how best to describe it) between approx 2500 and 3500 rpm. Also I have had a few instances of the rpm fluctuating at tickover 500-1000 rpm and back etc (but not every time I stop). Following advice here I checked the error codes by connecting the black lead - got code 23, MAF sensor? Reset the ECU (green lead operated the throttle etc, then drove till Engine light flashed steadily) -- have driven may approx 100 miles since and then checked error codes again - none reported, but still lumpy power 2500-3500 rpm (on flat and hills) and occasional varying idle speed.. Removed the MAF and cleaned it with non-residue electical contact cleaner, as advised elsewhere on forum. The Lambda sensor appears to have been replaced at some stage ( looks like a universal 3-wire as is "spliced" into the lead). Disconnected the MAF and car still started and idled, but with CEL on - does this imply MAF is not working. I am assuming a change of MAF and Lambda may be required -- anyone got any opinions if this is the right thing to do - or am I missing other possible causes for my symptoms (apart from the verbal diarrhea that is).. Am I running any expensive (!) risks in continuing to use the car with these faults ?
Also the previous owner couldn't tell me the immobiliser PIN - can I reset that using the programming PIN advised elsewhere on the forum to a new value ?
sorry so many questions .....
I have just bought the 99 Forester Turbo with 84 k with a good(ish) service history ( mostly Subaru dealer or specialist). Seems to be suffering from a lack of power/hestitation/misfiring/flat spot (don't know quite how best to describe it) between approx 2500 and 3500 rpm. Also I have had a few instances of the rpm fluctuating at tickover 500-1000 rpm and back etc (but not every time I stop). Following advice here I checked the error codes by connecting the black lead - got code 23, MAF sensor? Reset the ECU (green lead operated the throttle etc, then drove till Engine light flashed steadily) -- have driven may approx 100 miles since and then checked error codes again - none reported, but still lumpy power 2500-3500 rpm (on flat and hills) and occasional varying idle speed.. Removed the MAF and cleaned it with non-residue electical contact cleaner, as advised elsewhere on forum. The Lambda sensor appears to have been replaced at some stage ( looks like a universal 3-wire as is "spliced" into the lead). Disconnected the MAF and car still started and idled, but with CEL on - does this imply MAF is not working. I am assuming a change of MAF and Lambda may be required -- anyone got any opinions if this is the right thing to do - or am I missing other possible causes for my symptoms (apart from the verbal diarrhea that is).. Am I running any expensive (!) risks in continuing to use the car with these faults ?
Also the previous owner couldn't tell me the immobiliser PIN - can I reset that using the programming PIN advised elsewhere on the forum to a new value ?
sorry so many questions .....
Former Sponsor
iTrader: (4)
Joined: Jan 2001
Posts: 16,548
Likes: 2
From: ECU Mapping - www.JollyGreenMonster.co.uk
Was reading your description and thinking "MAF" then saw your reply, glad it is sorted.
Two options with the sump plug spring to mind.. firstly buy a replacement and then use a set of mole grips or a smaller socket tapped onto the bolt with a hammer (don't hit it too hard though else you might damage the sump or thread in the sump etc..)
Two options with the sump plug spring to mind.. firstly buy a replacement and then use a set of mole grips or a smaller socket tapped onto the bolt with a hammer (don't hit it too hard though else you might damage the sump or thread in the sump etc..)
Last edited by Jolly Green Monster; Nov 3, 2004 at 12:49 PM. Reason: because was sobber when I posted but looked like I had had 10 pints.
Thread
Thread Starter
Forum
Replies
Last Post
Scott@ScoobySpares
Full Cars Breaking For Spares
61
Jan 11, 2021 03:08 PM
Scott@ScoobySpares
Full Cars Breaking For Spares
55
Aug 5, 2018 07:02 AM
aaron_ions
General Technical
1
Sep 17, 2015 10:42 AM
