[T3] New pump different hic-ups

Jim Adney jadney at vwtype3.org
Wed May 13 07:03:41 PDT 2015

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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