[T3] engine backfiring
BilDylJ at aol.com
BilDylJ at aol.com
Tue Jul 31 14:49:22 PDT 2012
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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