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newbie

Joined: Sat Sep 10, 2016 10:20 am
Posts: 9
Vehicle: R50 pathfinder

Post Posted: Sat Aug 03, 2019 8:05 pm 
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Hey guys, I've just picked up a 1990 sierra. Only been driving it around for a day and by the sounds of it, the car has had petrol sitting in it for a long time whilst the car hasn't been used. I didn't drain the fuel I just topped it up at the local servo.

Anyway tonight I went to take it for a spin around the block and it had trouble starting and when I did get it to start it would stall when I came to a stop (when the revs dropped).

Is this a case of the car not liking the old fuel? Should I look at training the tank, replacing the fuel filters and the fuel lines?

Cheers

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Joined: Sun May 26, 2019 8:17 am
Posts: 19
Vehicle: 1989 Sierra Tintop

Post Posted: Sun Aug 04, 2019 2:17 pm 
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Just had the same issue, try checking the ignition coil, timing, spark plugs and leads, and valve clearances as a start. I tried all the fuel stuff and ended up finding my coil was arcing out in the centre pin causing it to run like a bag of.......well the exact same as yours.

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newbie

Joined: Sat Sep 10, 2016 10:20 am
Posts: 9
Vehicle: R50 pathfinder

Post Posted: Sun Aug 04, 2019 8:50 pm 
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Awesome, cheers for that, I'll probably still change the fuel filter and all that anyway but that's good help cheers mate

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az supporter
az supporter

Joined: Sat Mar 31, 2007 12:00 am
Posts: 940

Post Posted: Mon Aug 05, 2019 12:23 am 
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what i usually find with the sierra carbs is that the idle air bleed circuit gets blocked. its a venturi that bleeds air into the idle circuit and atomises the air fuel mixture for a smooth idle.
if you are experienced enough to take of the top of the carby , theres a brass screw with 2 flats nearby the accelerator pump , unscrew it and its like a inch and a half long tube it has a cross drilled hole at the top , but right at the bottom is a minute hole that bleeds air to the idle fuel , this is what usually blocks up.

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