Bad starting

[Barry S1]

Hi my S1 has a annoying habit of not starting well
When its worm its fine when could and when hot but
If I leave it for more then 20 mins its not good it always
Starts after 4 or 5 times and misses a bit for about 15 seconds
Then it fine any ideas please

[Barkychoc]

Barry I'm not quite sure what you mean - is it that if you leave it for a short while then try and restart it struggles?

[Barry S1]

Hi yes that’s right if i leave it for 15 /20 mins its hard to
start it has always been like this I have replaced the filter
and petrol pipes from tank to the pump plugs and leads
its just a bit annoying some times, its worst when a lot of
people are watching I think it hates me

[aero340]

HI BARRY, HAD A SIMILAR PROBLEM ON A ROVER V8 ENGINE I WAS RUNNING ,IT TURNED OUT TO BE THE IGNITION COIL ,ALTHOUGH I HAD A SPARK IT WAS A YELLOW COLOUR ,CHANGED THE COIL AND PROBLEM SOLVED A NICE BRIGHT CRISP SPARK ,MAY BE WORTH ALOOK KEV

[Barkychoc]

The other thing I've heard of happening like this is fuel vapourisation - I don't understand the exact science of it but I think its usually a hot weather issue - though it might be worth checking if there's anything silly under the bonnet like a fuel pipe routed close to the exhaust or something.

I think its when the fuel lines get too hot and the fuel in them turns to vapour, but someone more knowledgeable will enlighten us I'm sure.

The coil as mentioned sounds a better bet.

[Barry S1]

thanks I will give it a go when the snow
stops it under lots of snow at the moment

[jeff m]

In addition to above advice.
Two things work in conjunction for starting.
Thermotime switch (ops the extra injector)and the Aux air device which as it's name suggests regulates air flow.

The AAD would be worth a look and cleaning if it is a bit sluggish and not moving properly (open when cold, closes as engine heats up.)

Visiting Wedge person

[Barry S1]

Thanks Jeff il have to get the book out
this weekend and give it a go

[Le TVR]

My Jetronic diagnostic notes suggest the following:

i) Check CO at idle, ignition, clean up AAD and air-flow meter plate mechanism, check for air leaks.

ii) Check warm-up regulator H/C pressures are in spec

iii) Check injectors