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90 XF ute constant rough idle? 

 

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 Post subject: 90 XF ute constant rough idle?
Posted: Sat Jan 29, 2011 9:03 pm 
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gday all, have a December 1990 XF ute, 4.1l, 250 crossflow (like the older xf's) 5 speed manual. the old girl has an extremely rough idle. was set to idle around the 750rpm mark, was going great for a while then decided to just not idle at all. i then adjusted the mixtures so it idles at around 900- 1000rpm and is rough as guts.just prior to the idle playing up i changed plugs, dizzy cap, rotor button, leads & fuel filter. mechanic had a look at it, checked all vac hoses, no probs there.

any suggestions as to what it maybe??

cheers mick
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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sat Jan 29, 2011 9:08 pm 
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all XF's had a crossflow.

may be time for a carby rebuild. idle circuit may be full of dirt, debris etc

 

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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 12:17 am 
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where would i find the idle circuit?
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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 12:43 am 
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possible blocked jets :?:
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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 5:47 am 
Getting Side Ways
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he said rough idle. is it idle only? fine when you accelerate mildy and harshly?

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 10:05 am 
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its only rough idle, fine acceleration.
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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 11:17 am 
Getting Side Ways
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idle circuit i reckon then. if you said there is no vacuum leaks. or blocked fuel filter etc

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 11:32 am 
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try the aussie carby rebuild

carefull as it can hurt - break ya hand etc.

remove the air cleaner etc.
build up the rev's to around 1500
cup your hand over the carby (sealing 95% the air supply) forcing debris out of the jets due to vacuum.

half a can of carby cleaner then give it a flogging.

Chances are I may be wrong, but being a ute theres a high chance of a gas system yeh?

 

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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 1:51 pm 
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you could try removing the mixture screw and cleaning it up.
a few xf's ive worked on have had crud on the needle when i took them out.
i gave it a good spray with carby cleaner in there and a bit of dirt came out, replaced the screw and started them up and no more idle problems.
the screw is on the passenger side lower section of the carby, base setting is 1.5 turns out?
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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 3:09 pm 
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had a muck around with carby this morning. changed the fuel filter and adjusted mixing screw, still idles rough! had to turn the mixing screw right in, idles between 900 - 1100rpm, wont idle at all otherwise. sprayed carby cleaner into it, stil no change.

anyone got a spare webber for sale to suit ?

cheers mick
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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 5:26 pm 
Getting Side Ways
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SA, Australia

did you take the mixture screw right out and spray carby cleaner in the thread?
screwing it right in should stall the motor.
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 Post subject: Re: 90 XF ute constant rough idle?
Posted: Sun Jan 30, 2011 5:47 pm 
Stock as a Rock
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took screw right out, sprayed carby cleaner on thread and into hole. screwed it right in and motor didnt stall. seems to be idling between 700-800rpm now, but still rough
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