[urq] No start situation - suddenly

[urq]

I wonder if we aren't going off in the wrong direction here ... the engine
was running, now it is not and you know that there's no power to the ur-FP
relay ... 

My recommendation would be to force your auxiliary relay to send power to
the fuel pump and then see if it starts.  It looks like you are referencing
the US spec wiring diagram ... be really careful with that.  We know that
there are differences between the US and Euro Spec engines operate ... most
notably in the operation of the fuel pump relay.  There also was a recall in
the US to remote the FP relay from the fuse box, was that done in Europe as
well?  The FP Relay was remoted to eliminate some of the current load on the
fuse box.  If your FP relay was still in the fusebox there may be damage on
one of the power supply pins ... even though you now have eliminated this
load, how long was the car powering the FP via the fusebox?  

I've seen other bits of misinformation in other response from this thread
I'd like to comment on ... the urq is different from many other cars in that
the FP Relay control comes directly from the ECU, it is not triggered from
the ignition coil.  Therefore no spark will not necessarily guarantee no FP
relay.  Of course there may be a common cause that prevents both spark and
FP Relay.  

I'd recommend that you force the fuel pump to run independent of the FP
Relay in the fuse box and then see if the engine starts.  If it does then
you know that you need to track down the power in the fusebox and ur-FP
Relay ... if it does not start you know the problem is somewhere other than
the FP Relay Power circuit and we can start figuring from there ... Hall or
crank sensors and such ... let us know what you find.

Steve Buchholz

-----Original Message-----

> 
> Hello Pat
> Thanks for this.
> I've just checked - no spark on #1.
> In all the work I have done I haven't touched the distributor and the 
> cam/crank timing is cock-on.
> You're right about no spark = no signal to fuel pump relay - just got to 
> find out why no spark when it all worked fine a week or so ago.All I've
> done 
> since is re-fit the bumpers and lights/grill. Weird.
> There is power to the coil - unsure what/how to test further.
> Going back to garage to have a think!
> Thanks again.
> 
> Keith
>

SOme thoughts..

Unlike the 4k system, the stock urq ecu doesn not 'prime' the fuel pump whne
you turn on the key.

Pump only comes on when the ECU tell is to, and ECU will only do that if all
the sensors are 'happy'.

If you don't have spark AND you have no pump, I'd head straight to checking
the position of the distributor / cam relationship.  IF no results there,
check functionalty of the two flywheel sensors and the distibutor hall
sender.

Distributor position is critical setting for starting, and *can* change
slightly over time and (or even temperature, resulting in pesky 'hot start'
problems).

I'd wager your probem has nothing to do with your recent work, but is jsut a
coincidence to throw your troubleshooting skills off a bit!  :-)


=Frank=