If the only thing that changed was the exhaust pipe then he should look for
an exhaust leak which could be causing problems.  It's not impossible that
something else got nudged while in there but I'd check there first.

Though I once had a fuel pump quit the exact second I put on a new
distributer cap. Not that that caused any diagnoses problems... ;)

Bryan

________________________________
From: Jeff Lincoln <magikvw@GMAIL.COM>
To: vanagon@GERRY.VANAGON.COM
Sent: Mon, June 7, 2010 11:29:41 AM
Subject: 1.9L - Will not idle cold - when warm idles at 2800RPM

Hello -

I have a freinds who is having this issue. He said he has to keep giving the
bus gas to keep it running when cold. Once the engine warms the thing idles
at 2800rpms.

He said it has been running fine - the only change that was made is he
replaced the J-pipe int he exhaust system - said he used the same O2 sensor
that was in there.

Any ideas where he should start looking? TempII sensor? AFM? O2? Any of
these?

--
Thanks,

Jeff
'85 GL (Gertie)
'90 Carat (Grover - the noble parts donor)
'86 (We call this one Scrap)
'78 Bus (Melissa) Patty's Bus