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XR6T hesitation 

 

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 Post subject: XR6T hesitation
Posted: Mon Jul 01, 2013 8:45 pm 
Getting Side Ways
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Ride: 2007

Location: Mount Annan
NSW, Australia

I have an XR6T motor in my Mav that has an intermittent hesitation at part throttle. It is OK at idle and when it does it, it has a miss that comes to a point where it comes good instantly when you press harder on the go pedal. It seems to be RPM related more than throttle opening. Sometimes its good for the day other times its bad for the day, its dangerous in the wet because when it comes good you could very well be sideways in a flash.

Now the history, everything is standard including the ecu tuning. The engine loom is an NA with the 2bar TMAP connector fitted. The plugs are new as is the coil packs but ebay specials. The TPS was swapped out with another good one without any change.

 

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BF Fairmont Ghia Series II update.
GQ XR6T ghia patrol.

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 Post subject: Re: XR6T hesitation
Posted: Mon Jul 01, 2013 10:34 pm 
Getting Side Ways
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Ride: BF F6 Tornado - #0077

Location: Bendigo
VIC, Australia

twase wrote:
I have an XR6T motor in my Mav that has an intermittent hesitation at part throttle. It is OK at idle and when it does it, it has a miss that comes to a point where it comes good instantly when you press harder on the go pedal. It seems to be RPM related more than throttle opening. Sometimes its good for the day other times its bad for the day, its dangerous in the wet because when it comes good you could very well be sideways in a flash.

Now the history, everything is standard including the ecu tuning. The engine loom is an NA with the 2bar TMAP connector fitted. The plugs are new as is the coil packs but ebay specials. The TPS was swapped out with another good one without any change.


Clogged cam phases, Clogged or faulty fuel circuit, wastegate getting jammed? Bad Fly-by-wire throttle? could just be a faulty rev or crank sensor

 

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 Post subject: Re: XR6T hesitation
Posted: Mon Jul 01, 2013 10:45 pm 
Getting Side Ways
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Posts: 2644

Joined: 6th Nov 2004

Gallery: 8 images

Ride: 2007

Location: Mount Annan
NSW, Australia

Don't think its cam related, the head was fully recoed before it went on. Although its a BF turbo head and cams that does not explain the intermittent nature. New fuel pump, lines, filter and regulator.

 

_________________

BF Fairmont Ghia Series II update.
GQ XR6T ghia patrol.

,======o00o
//__|__|_,\_____\,___
|_/--\'_|'__|_/--\_[]IIII[]
_( o ) )_____( o ) )=o=) )__

Top
 Profile  
 
 
 Post subject: Re: XR6T hesitation
Posted: Tue Sep 10, 2013 8:18 pm 
Getting Side Ways
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Posts: 2644

Joined: 6th Nov 2004

Gallery: 8 images

Ride: 2007

Location: Mount Annan
NSW, Australia

Turns out the Charcoal box hoses may be wrongly installed, by disconnecting the purge solenoid it no longer has this hesitation on part throttle. The box is from an AU falcon, anyone have a diagram on where the three hoses go?

 

_________________

BF Fairmont Ghia Series II update.
GQ XR6T ghia patrol.

,======o00o
//__|__|_,\_____\,___
|_/--\'_|'__|_/--\_[]IIII[]
_( o ) )_____( o ) )=o=) )__

Top
 Profile  
 
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