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'85 ur-q Cold Start Problem (long)
Hoping someone may be able to shed some light on the following cold start
If I leave the car and it gets too cold (~anywhere below 0C) the car
becomes very difficult to start and when it does start I need to open the
throttle completely to get the car to keep running. The throttle has to be
held wide open for a while, and the car usually dies four or five times and
has to be cranked over. The problem is temperature dependent getting worse
as the temperature gets colder, be interesting to see if it starts tonight,
I'd like to get home.... Once running it idles and accelerates well.
So far I have checked all the fuses, cleaned up the contacts for the ECU,
and pulled the cold start injector and plugs. The cold start injector is
working okay (verified fuel squirt into jar test). The plugs were black
(carbon build up, all plugs the same) this is probably a symptom of the
problem? After cleaning the plugs and putting the cold start injector back
there was no improvement.
I also cleaned a ground contact at the back of the block and fixed a broken
ground contact at the front of the block. Hey presto, 9.00p.m. last night
the car started perfectly and idled as normal, so I assumed the problem was
fixed.... Well, it started fine this morning (quite a mild night/garaged)
and I got to work. After sitting in the car park for 4 hours I go out and
try and start it. It's back to it's usual, all the symptoms are the same as
before. Once it's running it's fine.
Apart from hoping the wind dies down and the temperature doesn't drop too
much. Can anyone recommend things too look at. Does this sound like the
warm up regulator? Personnaly I think it's electrical. Any clues to where I
should look next would be apprecaited. Where is the fuel punp relay in an
'85 TQC (Glen?)? After cranking I hear the FP buzzing for a few seconds
then it switches off, but it doesn't buzz with the ignition is turned on -
Is this right?
Sorry for the length, thanks and regards, Mike