[urq] No start situation - suddenly

[Keith Lloyd]

Thanks for all the responses so far. Much appreciated.

I have started again - Just to confirm - There is fuel in the tank!!
All wiring from fuel pump relay to pump is fine - evidenced by results of jumpering of the relay.
The jumpering also proved the feed from battery is intact and live, 

I understand the FPR shuts off if the engine stops turning - i.e. in a crash - and so if there is no spark I guess the ECU prevents the FPR from supplying power.

As I say above, I jumpered the relay and tried to start the car - nothing.I removed plug #1 and tied it to the lifting hoop and turned the engine over - definitely no spark.

I can confirm that the pump is actually moving fuel.

 

I have checked the timing marks - all cock-on.

Tomorrow I am going to check all the readings at the ECU connector. Hopefully this might point the finger at something.

In the meantime - any suggestions welcomed.

Regards

Keith

 
> From: urq at pacbell.net
> To: urq at audifans.com
> Date: Thu, 8 Apr 2010 13:24:43 -0700
> Subject: Re: [urq] No start situation - suddenly
> 
> 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=
> 
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