[urq] 83 URQ 10v Backfire in throttle body ?

[Brandon Rogers]

I actually think pressure testing the system is very easy - and _very_
efficient - once you make a plug for the turbo intake hose - and assuming
you have a compressor.  There are so many lines - and so many of them are
_so_ old - and so many of them are buried - there is no substitute for a
pressure test - and I use a stethoscope with a hose on the end - you won't
miss any air rushing past the end of that!

Brandon

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of Louis-Alain Richard
Sent: Tuesday, September 08, 2009 8:50 PM
To: 'Tim Maskus'; urq at audifans.com
Subject: Re: [urq] 83 URQ 10v Backfire in throttle body ?


Air leaks, sure, but before chasing this difficult gremlin, please do
yourself a favor and check the basics :

- compression on all cylinders (maybe a valve is not sealing anymore?)
- timing belt positioning (might have slip a tooth)
- oil cap and oil dipstick in place (very big air leak, very easy to check)
- vacuum hoses and oil breather tubes in place. Visual check is enough for
now.

If all check good, then it may be an enrichment function that is not doing
its job. You'll need a CIS testing gauge set to pinpoint the bad component.

Or a bad ignition wire. You can test them with an ohmmeter, (resistance
value is in the IST documents, if you don't have them, ask us) and you can
remove the steel boot at the plug end by unwind it from the wire to check
the condition of the wire itself.

Does the engine pops and backfires even when the engine is hot ?

Louis-Alain


-----Message d'origine-----

*I have had my 83 sitting for awhile in the driveway, and went out to start
it and the battery was dead. Charged it up and moved it into the garage.
Problem is is pops and backfires through the throttle body. I checked the
air intake temp sensor and the wires are ok. I cleaned it , but no changes.
Swapped the plugs,rotor, still no changes. Any ideas on where to look for
the problem ?   Thanks - Tim*
_______________________________________________


_______________________________________________
Audifans urq mailing list
Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
http://www.audifans.com/kb/List_information

Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/