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Jgladman
Joined: Sat Sep 10, 2016 9:50 am Posts: 13
Vehicle: R50 pathfinder
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Posted: Sat Aug 03, 2019 7:35 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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outterlimits95
Joined: Sun May 26, 2019 7:47 am Posts: 19
Vehicle: 1989 Sierra Tintop
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Posted: Sun Aug 04, 2019 1:47 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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Jgladman
Joined: Sat Sep 10, 2016 9:50 am Posts: 13
Vehicle: R50 pathfinder
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Posted: Sun Aug 04, 2019 8:20 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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losfer
az supporter
Joined: Fri Mar 30, 2007 11:30 pm Posts: 971
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Posted: Sun Aug 04, 2019 11:53 pm |
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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.
_________________ Dr Suzuki - South east Queenslands most experienced mobile Suzuki mechanic. Please like and share my facebook page - www.facebook.com/suzukimechanic
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