Re: [T3] Not injecting on number three

["Jim Adney" <jadney@vwtype3.org>]

On 8 May 2008 at 23:09, craig_webb wrote:

> History:
> Car has run fine for thousands of miles with stock FI.  Noticed a slight
> misfire this last couple of weeks when cold, but it went away when hot.  I
> was driving down the motorway at 70mph, when the mis-fire returned for good
> and I limped it home on three cylinders.
> 
> Investigations
> I traced the missing cylinder to number three.  I've pulled and cleaned all
> the spark plugs, no issues there.  Spark at the plug.  I checked the FI
> connector was nice and tight and it was.  I then pulled the 3/4 bank of
> injectors, switched the ignition on and went back to the engine and moved
> the throttle switch.  Number four injector gives a nice series of clicks
> when the throttle switch is moved.  Number three is dead.  (First big
> question - I should be getting some clicks in number three in this test
> shouldn't I?).

Only one pair of injectors will fire at a time with this test. To 
test the other pair, you need to rotate the distributor 180 degrees 
and try it again. If the injector fires then, check the ignition; if 
not, you may need to replace the injector. I've never seen an 
injector fail completely like this.

You should also check the resistance of each SP wire from the dist 
cap to the  SP connector. It's fairly common for the resistor in the 
SP connector to go open. This is MUCH more common than an injector 
failure.

SP connectors can be replaced individually, you don't have to replace 
the whole harness. The connector just screws into the wire.

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

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