[urq] No start situation - suddenly

Fri Apr 9 09:13:30 PDT 2010

Have you checked continuity of the sensors wiring.  I cant recall what the Crank position sensors wiring is like on the UR harness but on my 4000tq which had a KH motor on it,  I had similar issues.  Turned out the wiring went bad at the connector where the sensor connected to the ECU Harness.  ON the KH there are three of them.  Crank Position, Crank Speed, and ??? Knock??   Anyhow, the wiring just wore out there.  I would disconnect and test continuity on all pins from Connector to ECU plug.  

(Side note,  All WX 10v related stuff is available from my car, Harness included, if anyone needs them.  See audifans)

--- On Thu, 4/8/10, Keith Lloyd <spotatashleys at hotmail.com> wrote:

> From: Keith Lloyd <spotatashleys at hotmail.com>
> Subject: Re: [urq] No start situation - suddenly
> To: urq at pacbell.net, "urq at audifans.com" <urq at audifans.com>
> Date: Thursday, April 8, 2010, 3:27 PM
> 
> 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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