Classic Audi Ľ Technical Ľ Mech/Tech Ľ Electrical problems » 2bar boost reading and odd fuel gauge behaviour.

Reply
 
Thread Tools Display Modes
Old 07-01-19, 02:58 PM   #1
Isimmo
Moderator
Classic Audi Club Member
 
Join Date: Jul 2007
Location: Sissix-by-the-sea
Posts: 14,205
Default 2bar boost reading and odd fuel gauge behaviour.

Iíve a curious fault with the Ur since its return from restoration and Iíve spent several hours going through wiring diagrams and the car to no avail.

The core symptom is -

With ignition switch live, boost gauge reads 2bar and fuel gauge reads about 6 gallons low.

With the ignition switch dead (key on but immobilised) it is fine.

With ECU disconnected, itís fine.

Car runs fine in every other respect.

Has anyone experienced similar or knows any pointers?

All thoughts greatfully received.
__________________
1985 WR quattro, 1985 20vT RallyRep, 1993 MTM ABY S2 Avant.
Isimmo is offline   Reply With Quote
Old 07-01-19, 04:29 PM   #2
lefthooker
Senior Member
Classic Audi Club Member
 
Join Date: Feb 2011
Posts: 2,625
Default

Sounds like the sort of problem you sometimes get with a faulty earth.
lefthooker is offline   Reply With Quote
Old 07-01-19, 06:35 PM   #3
4v6
The engine meister!
Classic Audi Club Member
 
Join Date: Dec 2007
Posts: 5,958
Default

Quote:
Originally Posted by lefthooker View Post
Sounds like the sort of problem you sometimes get with a faulty earth.
Thinking same thing.
Since its all been apart its likely somethings not connected or contacting when it should.
4v6 is offline   Reply With Quote
Old 08-01-19, 10:23 AM   #4
Hanuman
Trickster
Classic Audi Club Member
 
Hanuman's Avatar
 
Join Date: May 2009
Location: Heckling from the cheap seats
Posts: 6,674
Default

Havenít you also just had a new alarm system installed? But Iíd certainly be looking at earthing issues.
__________________
enjoying Fish amok and a draught Angkor
Hanuman is offline   Reply With Quote
Old 08-01-19, 05:55 PM   #5
Isimmo
Moderator
Classic Audi Club Member
 
Join Date: Jul 2007
Location: Sissix-by-the-sea
Posts: 14,205
Default

Hi folk
Thanks for the replies so far.��
The alarm is new but was fitted after the fault materialised it would appear. There was a bit of a panic that the car was very low on fuel before it was MOT'd and that was before the alarm was fitted. It subsequently turns out that the car only took 10 gallons to brim the tank, not 20.
__________________
1985 WR quattro, 1985 20vT RallyRep, 1993 MTM ABY S2 Avant.
Isimmo is offline   Reply With Quote
Reply

Bookmarks

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
Forum Jump


All times are GMT. The time now is 07:38 PM.

Powered by vBulletin®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright ©2007-2008 Classic Audi | Site by Roadrunna