[T3] Problem starting & Warming up

Jim Adney jadney at vwtype3.org
Thu Sep 27 05:58:27 PDT 2012


On 27 Sep 2012 at 4:59, miah wrote:

> Hey T3's,
> In these last two weeks I've been having the exact same issue with my '71 Square (FI)
> That Josh has had with his ´70 Fastback... It's been driving me cRaZy!
>  
> I Changed Distributor Cap/Rotor/Condenser/Points/Plugs/Wires 
> New Temp Sensor
> I Adjusted the Valves 
> Checked the Timing and Idle (900)
> Checked for any Vacuum Leak (none)
> Cleaned Throttle Body
> Cleaned MPS and Connections
> Checked Connection to Cold Start Valve (as well as every other connection)
> Changed Fuel Filter
>  
> However I hear the same thing that Josh does with the Relay Clicking under the dash?!
> One of them being the Relay for my Brake Lights (not during start but later)

There is no relay for the brake lights, but the fuel pump relay is 
under the dash. If there is unusual noise on the 12 V line, this can 
make the turn signal relay click, but I've only heard that on the 
earlier, '68-70, TS relay.

If you're really hearing the fuel pump relay click, and can verify 
this by holding it and feeling the click, then I suspect that the 
ground for the main FI power relay has come loose and is opening and 
closing with engine vibration. That ground wire is under the screw 
head that secures the main power relay under the back seat, behind 
the driver. Check to see if that has come loose.

If it's not that, I suspect some sort of loose connection somewhere 
else. If this started recently, look in the area where work was done 
just before this started happening.

The bad connection COULD be in the FI brain. This is very rare, but 
if so, I can fix it if you send me the brain. If it comes to this, I 
can tell you what to look for to verify that you have this rare 
problem.  

BTW, I hope you didn't throw away your original plug wires. The OG 
wire ends to the top of the distributor are exceptionally nice and 
virtually unreplacable. They unscrew from the wires and can be reused 
forever. For cap, rotor and condensor, I almost never see bad ones as 
long as they are Bosch. Don't replace them with any other brand.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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