Thnik i need a vss.

ping · Posted: Wed Jun 22, 2011 4:51 pm Post subject: Thnik i need a vss.

Ok, MOT today and passed with flying colours. But when i change down from a cruise to say second or first approaching a stop etc the engine either cuts out or it will keep running if i am a bit nifty on the go pedal.
Is this due to no VSS or another fault? It drives really well otherwise.

ElusiveStranger · Posted: Wed Jun 22, 2011 8:10 pm Post subject:

Might be the neutral pos'n switch. Which is cheap to fix - mine's a paper clip rammed in the socket Happy

Buuuuuuutttttt. What bloody year????
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ping · Posted: Thu Jun 23, 2011 7:54 am Post subject:

I've got the nps wires plugged together. It's a 96 legacy donor, 2.0 n/a. Aslo my check engine light comes on after about half a mile but there is no fault when checked and goes away when restarted.

ElusiveStranger · Posted: Thu Jun 23, 2011 8:39 am Post subject:

Sounds like you do then.
_________________
The advice you receive on here is worth the paper it's written on.
Your experiences are worth shed loads to others, including the f'ups - live and learn.
Wouldn't YOU rather learn by someone else's mistakes? So would they.

'78 Bay, 2 litre 091 box, EJ20 NA & the ashtray's on the 'right' side.
I don't lean forward for hills any more Grin

Bugger, missed out on "Live fast, die young"

Joel · Posted: Fri Jun 24, 2011 3:51 am Post subject:

That's classic lack of VSS behavior.
You will notice the Chk eng light will come on when your above about 25mph and start coasting with no throttle.

If you can read the code it will actually be the Idle control valve fault but that is due to no VSS signal.

The ECU doesn't know whats going on when the throttle is shut, it thinks the car is not moving but the revs are at 2000rpm.
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1974 1303 Germanlook Suba-Beetle
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ping · Posted: Fri Jun 24, 2011 7:49 am Post subject:

On to Rjes later then. Thanks for the help.

rjes · Posted: Sun Jul 10, 2011 2:31 pm Post subject:

The error code behaviour varies enormously between different ECU part numbers. Some ECU's do give error code 24 (ISCV) as a 'phantom' code when run without a speed sensor, but this is a minority problem. It only affects only three ECU part numbers that I have come across, accompanied by error code 33 (VSS). All are from the mid '90's. The rest only show error code 24 when when there really is an ISCV problem.
As well as Delta Dash (MY00 --> only), which I have had for a long time now, I have just bought the genuine Subaru diagnostic gear for all models up to MY06, including all the '90's models. There is not as much detailed info available from the '90's ECU's but having the right tools will hopefully help to get a better understanding of these kind of things in the future.
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