[urq] No start situation - suddenly

[urq]

. sorry that I missed that you had already tried to start the engine after
forcing the fuel pump on.  This means that there is little need at present
to try to track down why the FP Relay isn't getting turned on . 

 

It sounds like you also verified that the battery voltage is good.  

 

You may want to read the troubleshooting section of the urq M&A document .
if you don't have a copy, you can read the softcopy Martin P has provided
at:

 

                http://www.quattro.ca/Urq/urq-IST-MaintAdj.pdf

 

Here again, this is for the US version of the car, but the general
principles should apply . 

 

Steve Buchholz

 

OBTW, a link to Martin's pages and other useful links can be found at the
urquattro Yahoo group.  There's a link to the yahoo group at the bottom of
every post and digest from the list . 

 


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=