Go Back   Subaru Impreza Forum - WRX STI Rally Performance Tuning > Subaru Impreza Technical Area > Technical General

Subaru Impreza Forum

Engine continues to run when MAF is disconnected !!
Reply
 
LinkBack Thread Tools Display Modes
Old 18 Jul 2005, 01:33 PM   #1 (permalink)
Fresh Scooby
 
Join Date: Jul 2005
Location: Sheffield UK
Posts: 8
Engine continues to run when MAF is disconnected !!

Hi

I was just wondering if this is normal, because basically the car runs like a bag of shit. The car boosts fine up till about 3500 revs then pulls back as though the car is misfiring. I read that if the maf is disconnected then the engine should stall, which points to the maf being faulty.......

Its an my99 UK Turbo with 52000 miles on the clock.

Please any help would be much appreciated.

Thank you
Offline   Reply With Quote
Old 18 Jul 2005, 01:41 PM   #2 (permalink)
Administrator
 
skylight's Avatar
 
Join Date: Apr 2004
Location: Here and S.Wales
Posts: 13,155
Yes if you disconnected at normal running temperature the car should stall as far as im aware... Could have yourself a duff MAF sensor

Welcome to the site too :wink:
Offline   Reply With Quote
Old 18 Jul 2005, 01:44 PM   #3 (permalink)
Fresh Scooby
 
Join Date: Jul 2005
Location: Sheffield UK
Posts: 8
Could there be anything else that wrong with it? Or anything else I could try to diagnose the problem.

Thank you, and thanks for the welcome
Offline   Reply With Quote
Old 18 Jul 2005, 01:49 PM   #4 (permalink)
Administrator
 
skylight's Avatar
 
Join Date: Apr 2004
Location: Here and S.Wales
Posts: 13,155
Hi, i would check out thiss thread: http://www.subaru-impreza.org/subaru...pic.php?t=2830

You could try an ECU error code reading to pinpoint the troubled area. ?

All the best
Offline   Reply With Quote
Old 18 Jul 2005, 05:02 PM   #5 (permalink)
Fresh Scooby
 
Join Date: Jul 2005
Location: Sheffield UK
Posts: 8
Cheers Gareth

Ive phoned the dealer from who I got the car, when I mentioned the problem he said "Yeah, the maf sensor is usually prone to failure on that model" Then he asked to get the part number off the unit. It was like he knew the sensor was on the way out, or maybe its just me speculating. I called Subaru up to get the part number for the car and they gave me a totally different part number, im guessing this is a revised unit.

The dealer is going to call me when he has the part, and ill keep you posted on the outcome.

Once again thank you

Marc
Offline   Reply With Quote
Old 22 Jul 2005, 11:00 AM   #6 (permalink)
Fresh Scooby
 
Join Date: Jul 2005
Location: Sheffield UK
Posts: 8
New MAF sensor fitted by Subaru this morning, jobs a good en

My car feels so much better now.

Thanks to all

Marc
Offline   Reply With Quote
Old 22 Jul 2005, 12:42 PM   #7 (permalink)
Dedicated Scooby
 
Nelson's Avatar
 
Join Date: Apr 2004
Location: South West
Posts: 2,659
Good job 8)
Offline   Reply With Quote
Old 22 Jul 2005, 12:46 PM   #8 (permalink)
bob
Senior Scooby
Paid & Proud
 
bob's Avatar
 
Join Date: Jul 2004
Location: Bristol UK
Posts: 1,547
You would think Subaru would have sorted out a differant type of MAF for these cars by now. They all seem to be very unreliable. 99-00 being one of the worse.
Offline   Reply With Quote
Old 22 Jul 2005, 03:20 PM   #9 (permalink)
Fresh Scooby
 
Join Date: Jul 2005
Location: Sheffield UK
Posts: 8
They have, the new unit they have put on has a different part number to my old one..... So im guessing this is a revision. Ive had the car a week now, but its only been today that I have dared to open her up.

Still smiling now :roll: Cant wait for my dumpy
Offline   Reply With Quote
Old 22 Jul 2005, 03:45 PM   #10 (permalink)
bob
Senior Scooby
Paid & Proud
 
bob's Avatar
 
Join Date: Jul 2004
Location: Bristol UK
Posts: 1,547
The new MAF (Green dot on the side) is much the same as the old one. These are still going pop as much as the older one. Think we need to get the new age MAF's converted to fit the Classics.
Offline   Reply With Quote
Old 22 Jul 2005, 05:21 PM   #11 (permalink)
Dedicated Scooby
 
Nelson's Avatar
 
Join Date: Apr 2004
Location: South West
Posts: 2,659
Totally agree with you Bob - I fitted an AFR gauge to my previous Scoob purely so I could keep an eye on how the car was fuelling - the dying MAF syndrome for the MY99/00's made me quite paranoid
Offline   Reply With Quote
Old 22 Jul 2005, 06:11 PM   #12 (permalink)
Fresh Scooby
 
Join Date: Jul 2005
Location: Sheffield UK
Posts: 8
So its still possible for my new unit to fook up? Oh dear

Also, I know this is off topic, but do you guys get a sort of loud clicking noise from the engine? I notice it more when I go down a narrow street, and the sound ricochets back off the walls. I know that the boost solenoid ticks, could it be that? Or am I being the paranoind one now :shock:

Thanks
Offline   Reply With Quote
Old 22 Jul 2005, 11:32 PM   #13 (permalink)
Dedicated Scooby
 
Nelson's Avatar
 
Join Date: Apr 2004
Location: South West
Posts: 2,659
Boost solenoid does click if you are running a decatted doanpipe its also possible to hear the wastegate at times which also gives off a clicking type noise
Offline   Reply With Quote
Old 23 Jul 2005, 02:30 PM   #14 (permalink)
Fresh Scooby
 
Join Date: Jul 2005
Location: Sheffield UK
Posts: 8
Thats ok then, cheers matey

I dont have any sort of after market exhaust, apart from a different back box that was on the car when I bought her, do you recommend me changing the manifold or downpipe/up-pipe? If so would it still pass the mot's and would I have to inform the dreaded insurance company?
Offline   Reply With Quote
Old 23 Jul 2005, 04:22 PM   #15 (permalink)
Dedicated Scooby
 
Nelson's Avatar
 
Join Date: Apr 2004
Location: South West
Posts: 2,659
Well a free flowing Exhaust will give you a power gain - especially the Down Pipe being decatted. However yes you should notify your Insurance company of the Modification and secondly if a car is fully decatted then you may well have a problem at MOT time unless you have a local friendly tester

It is possible to Decat the Down Pipe and leave the centre cat in place but a full decat is whats recommended.
Offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
16 important OIL questions and answers oilman Technical General 0 23 Jan 2008 03:31 PM
Answers From The Oil Expert Part # 2 oilman Technical General 0 18 Oct 2007 12:57 PM
FORD'S BRIDGEND ENGINE BUILDERS PARCEL UP THEIR GOOD IDEAS skylight General Chat - Anything about Anything 1 19 Aug 2005 09:55 PM
OUTSTANDING NEW ‘BOXER’ ENGINE FOR ’06 LEGACY RANGE skylight General Chat - Anything about Anything 3 03 Aug 2005 10:15 AM
Which engine fits my '99 sedan turbo mirk Subaru Impreza Discussions 0 31 Jul 2004 09:46 AM


All times are GMT. The time now is 09:32 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.