[T3] type3-vwtype3.org Digest, Vol 56, Issue 16

[Glen Fafara]

On 5/13/2015 4:42 PM, type3-vwtype3.org-request at lists.vwtype3.org wrote:
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> Today's Topics:
>
>     1. Re: New pump different hic-ups (Tim Keohane)
>     2. Re: New pump different hic-ups (Jim Adney)
>     3. Re: New pump different hic-ups (Tim Keohane)
>     4. Re: New pump different hic-ups (Brion Sabbatino)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 13 May 2015 07:32:51 -0700
> From: Tim Keohane <rheorojo at frontier.com>
> To: "type3 at vwtype3.org" <type3 at vwtype3.org>
> Subject: Re: [T3] New pump different hic-ups
> Message-ID: <A2AF84CF-78E7-4E06-9856-5936D962F4B0 at frontier.com>
> Content-Type: text/plain;	charset=us-ascii
>
> I would like to get one. How much are they?
> When an injector leaks is the leak to the outside or is it a leakage that produces a dribble into the cylinder?
> I read (sales pitch ?) that changing a single injector is not recommended, that changing all 4 is recommended.
>   Is it possible to soak injectors in a diesel/kerosene bath and possibly save them?
> I presume the workings are such that the needle retracts for a fraction of a second and the pressurized fuel sprays into the cylinder.
> I'll go through the excursive of testing the shelf ones for my own curiosity.
> Thanks Tim
> 73 FI auto
>
> Sent from my iPad
>
>> On May 13, 2015, at 7:03 AM, Jim Adney <jadney at vwtype3.org> wrote:
>>
>>> On 12 May 2015 at 22:33, Tim Keohane wrote:
>>>
>>> I went out and did as you suggested and checked the points, and
>>> timing. Didn't check the fuel pressure. The pressure sensor is a good
>>> one. I did, after re-connecting the cold start injector, while the
>>> engine was idling pull the injector plugs one at a time and found on
>>> 2,3,&4 the engine really struggled. On #1 it improved for a second or
>>> two then dropped back to a poor idle. My guess is the injector is
>>> stuck open. I'm not certain how they operate. I have not checked the
>>> temp sensors as this just happened and previously it was running
>>> better than it has for years. ( since before these injectors were
>>> installed ) I have another set of 4 but they have been on the shelf
>>> for several years. May be time to give them a test.
>> One possible cause of white smoke is a stuck, or sticky, injector. I
>> agree that your #1 injector may be sticky. That will make it much
>> more rich at idle than at speed, so I'd be tempted to take it for a
>> drive to see if it clears up with some running time.
>>
>>> I'm thinking I can attach them one at a time to the test stub between
>>> 3 and 4. If they don't leak then they are good to go. If they leak
>>> then pass.
>> Used injectors that have been stored dry will almost certainly leak,
>> and may also have internal rust that causes them to stick open.
>> Always store used injectors immersed in kerosene or diesel fuel. This
>> has a much better chance of preserving them.
>>
>> I have new injectors if you want one.
>>
>>
>>
>> -- 
>> *******************************
>> Jim Adney, jadney at vwtype3.org
>> Madison, Wisconsin, USA
>> *******************************
>>
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> ------------------------------
>
> Message: 2
> Date: Wed, 13 May 2015 10:24:27 -0500
> From: "Jim Adney" <jadney at vwtype3.org>
> To: type3 at vwtype3.org
> Subject: Re: [T3] New pump different hic-ups
> Message-ID: <55536CAB.29143.75090F at jadney.vwtype3.org>
> Content-Type: text/plain; charset=US-ASCII
>
> On 13 May 2015 at 7:32, Tim Keohane wrote:
>
>> I would like to get one. How much are they?
> Genuine Bosch, $60 each, plus shipping.
>
>> When an injector leaks is the leak to the outside or is it a leakage
>> that produces a dribble into the cylinder?
> Both happen. External leaks are obvious, but it sounds like your #1
> has an internal leak.
>
>> I read (sales pitch ?) that changing a single injector is not
>> recommended, that changing all 4 is recommended.
> I've never had a problem as long as I stuck with OE Bosch. I've seen
> other cars that had an aftermarket injector that was clearly not
> matched to the other Bosch ones. Since then, I avoid anything but the
> correct Bosch number.
>
>>   Is it possible to soak injectors in a diesel/kerosene bath and
>> possibly save them?
> It's possible that this could cure on kind of external leak. The most
> common external leak, however, is from a cracked hose. That can be
> fixed by replacing the hose. That's a bit of a tough job if you're
> not set up for it, but I can do it for you if you want for $5 each.
>
>> I presume the workings are such that the needle retracts for a
>> fraction of a second and the pressurized fuel sprays into the
>> cylinder.
> Exactly, and you can depress that tiny pintle with the corner of your
> fingernail and feel it move. It only moves a few thousandths, but
> it's enough to feel.
>
>> I'll go through the excursive of testing the shelf ones for my own curiosity.
> Sure, that can be an interesting exercise.
>
On YouTube you can find videos showing various techniques for internally 
cleaning injectors on the bench using a battery and carb. cleaner.  This 
is simple to do and may help if you don't have access to a suitable 
ultrasonic cleaner.
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