[T3] engine backfiring

Tue Jul 31 17:29:59 PDT 2012

I'm not sure if the wires are right or wrong but it running  good again.
It's got to be hard for you guys to diagnose an engine problem when the  
engine is not setup like the original T3's.  Thanks again !!!!

      Bill

In a message dated 7/31/2012 6:50:25 P.M. Eastern Daylight Time,  
dave at hallvw.clara.co.uk writes:

Like  Jim, I couldn't recall whether grey boots are nearer than black  when
working on the engine (belt end), but I think that's the way, with  black by
the flywheel end squirting cyls 1 and 3, which agrees with your  black 
wires.

It's just one of those things you know is right, and  never change round, so
we missed the possibility.  With the original  harness, I think it would be
obvious from the lengths and pre-formed shape  anyway.

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 Dave Hall
Sent: 31 July 2012 23:37
To:  type3 at vwtype3.org
Subject: Re: [T3] engine backfiring

I guess we all  overlooked that possibility!

The injectors are paired, and the pairs  are identified by grey and black
boots, so you can put them on the correct  pairs of cylinders. The grey
injectors fire together, then the black  pair.  The fuel is squirted into 
the
manifold two cylinders at a time  and gets sucked in as the intake valve 
next
opens.

Now yours are on  the correct cylinders, it's working OK.  It sounds as if
the harness  has been re-made, since the protective boots aren't there any
more, and the  wire colours have changed.  Normally they would all be white,
and  numbered to identify them.  No problem if it works fine.   

Enjoy your trike!

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
BilDylJ at aol.com
Sent: 31 July 2012 22:49
To:  type3 at vwtype3.org
Subject: Re: [T3] engine backfiring

Hi  Guys
I think I stopped my Trike engine from backfiring.
I  noticed that the wires leading to the injectors on the right side of   
the
engine are black to rear injector and red to the front  injector..  But the
left side was red on rear injector and the black was on  the  front injector
{front of engine being where the belt is located.}  
I switched the wires on the left side to match the   wires on the right
side.The red wires are on the front injectors on   both sides of the engine
now and the engine stopped backfiring. I know  it's  confusing but I have
been confused ever since I had the first  mechanic work on the engine when 
it
wouldn't start. It never backfired  before he worked on it.  
Maybe the wires got switched when he checked  the injectors. Maybe  there
wrong now but the engine starts & runs  good now and it don't  backfire
anymore.  
Thanks Guys

Bill

In a message dated 5/21/2012 5:32:10 P.M. Eastern Daylight  Time,
BilDylJ at aol.com writes:

Thanks  Guys !! 
I'll check it  out.
I thought it might be a problem with an  injector.
I ordered 2  sets of injectors seals today.
I'll try that 1st.  I don't think the  injectors are bad.
The engine runs strong when your   accelerating.
Thanks Again.
Bill Doyle    

In a  message dated 5/21/2012 7:17:10 A.M.  Eastern Daylight Time,   
dave at hallvw.clara.co.uk  writes:

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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