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Old 17-06-2014, 06:34 PM   #1
Caprobbo
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Default XR8 Wierd Problem

Hi all got a weird one, my au2 xr8 200kw ute is making a scraping/squealing noise from what seems the rear of the motor when you try to accelerate when the motors cold. At the same time as the scraping noise the motor cuts out which makes you back off and it then instantly comes back to life as normal. Once its completely warmed up its fine. You would swear the flywheel was scraping but what's the cut out cause.????

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Old 18-06-2014, 04:57 AM   #2
portokatsiki
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Default Re: XR8 Wierd Problem

99 percent sure it's the cam synchroniser where the dizzy used to be
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Old 18-06-2014, 11:41 AM   #3
Caprobbo
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Default Re: XR8 Wierd Problem

Making that much noise and cutting the spark?
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Old 21-06-2014, 04:57 PM   #4
Caprobbo
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Default Re: XR8 Wierd Problem

Checked the cps and found oil in the sensor housing and a fair amount of side play,amazing how much noise it can make. While on the subject can any power/economy gains be made from moving the cps forward or back a bit. Has anyone tried this?
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Old 21-06-2014, 05:08 PM   #5
STINKY NINJA
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Default Re: XR8 Wierd Problem

The ignition timing isnt adjustable on an au,you need a tune to do that through the ecu afaik.
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Old 21-06-2014, 05:38 PM   #6
Caprobbo
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Default Re: XR8 Wierd Problem

Don't worry guys, just read the cps just tells the computer if #1 is on the compression or exhaust stroke, mostly for start up ,moving it makes no difference. Google does it again!
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Old 22-06-2014, 05:41 PM   #7
Caprobbo
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Default Re: XR8 Wierd Problem

I just ordered a Dorman cam sensor and now I read they are a Chinese pos.Anyone used one of these before?
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Old 22-06-2014, 09:16 PM   #8
auIILTD
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Default Re: XR8 Wierd Problem

Quote:
Originally Posted by Caprobbo View Post
I just ordered a Dorman cam sensor and now I read they are a Chinese pos.Anyone used one of these before?
No personal experience with the Dorman product. Hope it works ok for you. Just an FYI, when you are fitting your replacement, you have to be TDC on your compression stroke. Your cam sync which is driven off the cam turns at half the rate of your crank.

Before you pull your old sync, take the plastic cap off, turn your crank to where the solitary finger is going past the sensor in the plastic cap. That way you know your on the correct stroke of TDC. Here is what it looks like with the cap removed at the correct TDC (apologies for the state of the rest of the engine, but you can at least see No 1 is TDC):


Hope that helps.

Cheers
Stu
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2002 AU II LTD

5.6L 342ci T3 Short, AFR165 heads, Comp XE270HR-12 Cam, Brembo 4/4s(355/330), T3 5 spokes, LC-1 wideband, Whiteline HD swaybars, TCE 3K Hi Stall, PWR Auto Trans Cooler, Koni shocks, King Low Springs, Hurricane headers, 100 cpsi cats, Twin 2.5" exhaust.

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2002 XR8 pursuit 250

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