VW T25 Subaru cuts out when coming to a stop

for questions and answers about alternative power transplants on the T25, GTi, Porsche,Subaru etc, this is the place. You must register to post but anyone can read.

Moderators: User administrators, Moderators

Post Reply
mshaw1980
Registered user
Posts: 588
Joined: 10 Aug 2015, 06:50
80-90 Mem No: 14800
Location: Peel, Isle of Man

VW T25 Subaru cuts out when coming to a stop

Post by mshaw1980 »

Hope people can help on this one.

I understand a vehicle speed sensor is needed to stop this happening which I have but I noticed my Speedo wasn't working which I assumed was why the VSS signal was not being fed through to the ecu, hence the cutting out.

I have now fitted a new Speedo cable but the Speedo dial 'bounces' and I am still cutting out coming to a stop (engine light comes on).

Am I missing something or is it likely the bouncing Speedo cable is causing signal issues with the VSS?

Thanks :ok
1987 VW T25: Subaru EJ20 using RJES parts (If it was meant to go fast it wouldn't be brick shaped!)

User avatar
slowcoach
Registered user
Posts: 1574
Joined: 06 May 2010, 10:23
80-90 Mem No: 8892
Location: West Yorkshire
Contact:

Re: VW T25 Subaru cuts out when coming to a stop

Post by slowcoach »

the speed sensor is a classic stall on stop error. Your speed sensors connected to the back of the Speedo right? Don't think the bouncing needle will stop it working, they all do that, mine certainly does. ECU only needs a rough signal to keep it happy.

If check engine light comes on, why not read the code and it'll tell you what's wrong?
===================
1984 TRAKKA Conversion Subaru EJ20 5 Speed

Goldfeesh
Registered user
Posts: 103
Joined: 31 Aug 2010, 21:25

Re: VW T25 Subaru cuts out when coming to a stop

Post by Goldfeesh »

Vss as above. Without it they also seem to throw iacv fault codes.

adie89
Registered user
Posts: 293
Joined: 04 Sep 2012, 21:25
80-90 Mem No: 11532
Location: Wiltshire

Re: VW T25 Subaru cuts out when coming to a stop

Post by adie89 »

mshaw1980 wrote:Hope people can help on this one.

I understand a vehicle speed sensor is needed to stop this happening which I have but I noticed my Speedo wasn't working which I assumed was why the VSS signal was not being fed through to the ecu, hence the cutting out.

I have now fitted a new Speedo cable but the Speedo dial 'bounces' and I am still cutting out coming to a stop (engine light comes on).

Am I missing something or is it likely the bouncing Speedo cable is causing signal issues with the VSS?

Thanks :ok

Remove your speedo inner from the sheath, regressed liberally with a General Purpose grease. Generally cable manufacturers aren’t generous. This fixed my bounce on a new cable. Also over tight curves can pinch the inner cable
Greta: 85’ LHD 2.5L Subaru 14in Syncro
http://forum.club8090.co.uk/viewtopic.php?t=165773

mariner
Registered user
Posts: 379
Joined: 05 Jul 2011, 20:04
80-90 Mem No: 9916
Location: Bristol

Re: VW T25 Subaru cuts out when coming to a stop

Post by mariner »

Had the same problem for a year or so - stalling at junctions/roundabouts. No speed sensor on mine and turned out it was the idle air control valve. Solenoids were playing up. According to the Subaru specialist who diagnosed mine it’s a pretty common problem. Managed to pick up a new one from an importer of Japanese parts for £120 but was quoted as high as £300 by some. Changed it over myself and not had a problem since.
1985 Super Viking with Subaru EJ22 (formerly 1.9 petrol DG)
1981 air-cooled 2.0 high top

mshaw1980
Registered user
Posts: 588
Joined: 10 Aug 2015, 06:50
80-90 Mem No: 14800
Location: Peel, Isle of Man

Re: VW T25 Subaru cuts out when coming to a stop

Post by mshaw1980 »

mariner wrote:Had the same problem for a year or so - stalling at junctions/roundabouts. No speed sensor on mine and turned out it was the idle air control valve. Solenoids were playing up. According to the Subaru specialist who diagnosed mine it’s a pretty common problem. Managed to pick up a new one from an importer of Japanese parts for £120 but was quoted as high as £300 by some. Changed it over myself and not had a problem since.

Thanks Mariner.

May try cleaning it out first and see what happens. :ok
1987 VW T25: Subaru EJ20 using RJES parts (If it was meant to go fast it wouldn't be brick shaped!)

Post Reply