[928uk] Still no start.

[Michael Parris]

I have been talking with Martin about this.

The car wasn’t starting in cold weather but would start when the air
temperature went up a bit.

New temp 2 fitted before intake rebuild but still wasn’t starting when cold.

When it did start it would be lumpy almost cutting out, then it settled
down to an even idle.

New fuel pump and filter.

New temp2

New  idle stab valve

New injector seal kit

New intake gaskets and seals etc.

New plugs.


So from the above we know it will run once it gets going so timing (not
touched), CPS, getting fuel and spark is all there.  Martin measured the
resistance of temp 2 and it's in spec.

That takes us into the not so obvious things like a bad non-return valve at
the pump (if it was swapped over from the old pump) or some other loss of
fuel pressure.  Too lean a mixture perhaps or air/vacuum leak but it wont
start with throttle applied when cold either and I'd expect lean mixture to
be overcome with throttle even if it doesn't stay running once started.

I presume the battery has been disconnected while work was carried out so
it resets the idle adaptation


Try checking for air leaks, try starting it without the MAF (I believe the
MAF has been checked) and see if you can check the vacuum on the front fuel
damper line which should be around 18-20hg at idle If you can get it
started.  You could also after trying to start it (or running the fuel
pump) 30 minutes later crack the fuel line on the left rail at the hose
that goes to the right rail (carefully) and fuel should spit out at high
pressure so only crack it slightly.  If there's no pressure that would
indicate a problem with perhaps leaking injectors.  It's more work but you
could check a few plugs after trying to start and see if they're wet and
wet plugs (flooded) don't spark easily.


Regards,

Mike

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On Sun, 22 Nov 2020 at 14:10, MARTIN PRUCE via 928uk <928uk at lists.928.org.uk>
wrote:

> Afternoon all.
>
>
>
> Well, I think I have had it now....
>
>
>
> This carries on from my previous posts of not starting in cold weather.
>
> Just finished an intake re-fresh with all new gaskets, connectors,
> injector seals and a new idle stab. Valve. And guess what...Still won`t
> start..
>
> I have carried out the suggestions from you kind folks that gave me advice
> in trying to resolve the issue but with my lack of knowledge and skill, I
> feel i have done all I can.
>
> I cannot afford the expense of shipping it to a specialist, if I could
> even find someone that would work on it , so one option maybe just part it
> out instead?
>
>
>
> Sorry for the rant...
>
>
>
> Kind regards.
>
> Martin
>
> MY87S4 auto.
>
>
>
>
>
> .
>
>
>
> I think I have done all I can with
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>
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