[T3] engine backfiring

[Dave Hall]

Mine backfired with flame(!) occasionally after I put in a NOS injector.
After a week or two it stopped doing it - I figured the internal seals may
have shrunk and were leaking a bit of gas, and had swollen up to seal
better.  You may find yours cures itself now, having been in use for a
while.

Dave.
UK VW Type 3&4 Club
===================

-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jim Adney
Sent: 21 May 2012 02:02
To: type3 at vwtype3.org
Subject: Re: [T3] engine backfiring

On 19 May 2012 at 19:02, BilDylJ at aol.com wrote:

>   I have a old home built trike with a 1972 type 3 fuel injected  
> engine with manual trans. The Trike ran good for about 2 yrs. Buy I 
> had to  store it covered over outside for a month and when I got back, 
> It would not  start. I got it started but now the engine is 
> backfiring. It seams to run  good when you are heavy on the throttle 
> but when you hold it at a steady speed,  like 30 mph and just give it 
> enough fuel to hold that speed the engine will backfire continually,
always from the same side muffler.

1) Check the hose from the intake air distributor to the pressure sensor. If
it has fallen off, it will act like this.

2) Get a copy of the Bentley Type 3 service manual. That's the ONLY place I
know of that will give you the right tuneup proceedure for the '72. It's a
PITA, and different from all the other years.

--
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************

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