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29-02-2012, 04:02 PM
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Regular Member
Join Date: Jun 2007
Posts: 214
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My AU2 XR6 Ute (VCT) has developed a rough idle and a bad miss just off idel / under load. Clears out fine with a few revs. It is also hard to start when cold.
I have replaced coil, leads and plugs (leads and plugs twice thinking they were faulty) and had the injectors cleaned, to no avail. I am thinking it is the intake manifold gasket, as I have read on here that it is quite common. I have sprayed aerostart all around the intake manifold with the engine idling, but didn't notice any change. Could the gasket still be faulty? Is there a good thread on here showing how to replace the gasket? Is it a big job? Thanks, Mark |
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29-02-2012, 05:06 PM
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Flairs - Truckers Delight
Join Date: Aug 2006
Location: Brisbane Northside Likes: Opposite Lock
Posts: 5,731
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when was the last time you changed your fuel filter?
__________________
Current: Silhouette Black 2007 SY Ford Territory TX RWD 7-seater "Black Banger"
2006-2016: Regency Red 2000 AUII Ford Falcon Forte Automatic Sedan Tickford LPG "Millennium Falcon" |
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29-02-2012, 05:18 PM
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#3 | |||
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Regular Member
Join Date: Jun 2007
Posts: 214
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Quote:
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29-02-2012, 07:04 PM
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#4 | ||
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Regular Member
Join Date: Aug 2007
Posts: 108
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Changing the Intake Manifold gasket isnt that big of a job, you just need the right tools to make it easier.
Ratchet spanners will make things a ******** easier, also a stubby ratchet spanner on the back bolts up near the coil pack i think it was, is REALLY recommended. |
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29-02-2012, 07:52 PM
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#5 | ||
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Walking with God
Join Date: Mar 2005
Location: Melbourne
Posts: 7,321
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If the areostart made no difference, then I'd guess it's not that gasket.
Just use a 10mm and tighten (gently) all the bolts on the manifold you can get to anyway. Good insurance. Have you cleaned the IAC? Cleaning IAC/ISC Valve http://www.fordforums.com.au/showpos...9&postcount=43 GK
__________________
2009 Mondeo Zetec TDCi - Moondust Silver 2015 Kia Sorento Platinum - Snow White Pearl 2001 Ducati Monster 900Sie - Red Now gone! 1999 AU1 Futura Wagon - Sparkling Burgundy On LPG Want a Full Life? John 10:10 |
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01-03-2012, 09:32 PM
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#6 | ||
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Regular Member
Join Date: Jun 2007
Posts: 214
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The last 3 mechanics I have spoken to have all told me to compression test the engine, because they reckon it could be the head gasket (even though it doesnt get hot and doesnt use water), so, I have just finished doing just that.
The compression tester I was using is meant to be used on motorbikes, and I couldnt tighten it down properly in the plug holes. Anyway, here is what I got: Cyl 1: 200psi Cyl 2: 210psi Cyl 3: 190psi Cyl 4: 180psi Cyl 5: 180psi Cyl 6: 210psi On cyls 4 & 5, the compression was still going up when we stopped cranking, but we had to stop because the threads were coming out. I think the head gasket is fine. I am convinced I can hear a loud hiss coming from the intake manifold gasket at cyl 5 on idle, that goes away as you rev it. I will clean the IAC valve, and replace the fuel filter. If that doesnt work, think im just gonna hook in and replace the intake gasket. Thoughts? |
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01-03-2012, 10:59 PM
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#7 | |||
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Walking with God
Join Date: Mar 2005
Location: Melbourne
Posts: 7,321
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Quote:
Won't hurt and they are both simple enough to do. The fuel filter nuts will be darn tight I'm tipping! Then go for the gasket as you've said. Keep us posted. GK
__________________
2009 Mondeo Zetec TDCi - Moondust Silver 2015 Kia Sorento Platinum - Snow White Pearl 2001 Ducati Monster 900Sie - Red Now gone! 1999 AU1 Futura Wagon - Sparkling Burgundy On LPG Want a Full Life? John 10:10 |
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01-03-2012, 11:21 PM
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#8 | ||
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Regular Member
Join Date: Jun 2007
Posts: 214
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Why do you say that GK? I have replaced it regularly, last time was about 20000km ago.
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02-03-2012, 01:40 AM
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Walking with God
Join Date: Mar 2005
Location: Melbourne
Posts: 7,321
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I thought I was going to snap something last time I undid the fuel filter! LOL!
Thank God it wasn't my gut!  GK
__________________
2009 Mondeo Zetec TDCi - Moondust Silver 2015 Kia Sorento Platinum - Snow White Pearl 2001 Ducati Monster 900Sie - Red Now gone! 1999 AU1 Futura Wagon - Sparkling Burgundy On LPG Want a Full Life? John 10:10 |
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26-03-2012, 10:21 AM
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#10 | ||
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Regular Member
Join Date: Jun 2007
Posts: 214
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Some mates and I got stuck in and replaced the intake manifold gasket on Saturday arve, ute purrs like a kitten again now...
All the bolts holding the inlet manifold on were loose, and the old gasket just crumbled and fell away. Took us about 2 hours all up, but if the engine wasn't hot, and we didnt drink so many beers, it wouldve been alot quicker! Thanks for all the help guys. |
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26-03-2012, 11:09 AM
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#11 | ||
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Au Falcon = Mr Reliable
Join Date: Sep 2009
Location: North West Slopes & Plains NSW
Posts: 4,076
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Well done on resolving the miss & rough idle it can be a pita lol! i went through all the usual stuff/money trying to sort out a slight miss at idle in my i6 intech.There are ways to check which parts are faulty without spending money on parts you dont need, lol! I learned alot through that period thats for sure!
cheers,Maka
__________________
Ford AU Series Magazine Scans Here - www.fordforums.com.au/photos/index.php?cat=2792 Proud owner of a optioned keeper S1 Tickford Falcon AU XR6 VCT - "it's actually a better-balanced car than the XR8, goes almost as hard and uses about two-thirds of the fuel" (Drive.com 2007) |
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08-06-2015, 05:27 PM
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Starter Motor
Join Date: Jun 2015
Posts: 3
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Hi all I just replaced the intake manifold gasket on our ford au straight 6 and it was running like a dream. Took it for a good drive yesterday with out a hitch. The wife started it up this morning and it was running rough like its starving or not firing right. Any idears anyone?
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09-06-2015, 08:49 AM
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Au Falcon = Mr Reliable
Join Date: Sep 2009
Location: North West Slopes & Plains NSW
Posts: 4,076
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Did you reset the battery? The ecu probably needs relearning.
cheer's Maka
__________________
Ford AU Series Magazine Scans Here - www.fordforums.com.au/photos/index.php?cat=2792 Proud owner of a optioned keeper S1 Tickford Falcon AU XR6 VCT - "it's actually a better-balanced car than the XR8, goes almost as hard and uses about two-thirds of the fuel" (Drive.com 2007) |
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09-06-2015, 09:54 AM
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#14 | ||
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Starter Motor
Join Date: Jun 2015
Posts: 3
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Thanks MAKA I will give it a go. Hopefully that's all it is.
Seems strange that it ran so sweetly till it sat over night and then the problem presented itself. I'll let u know how I go. |
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13-06-2015, 08:06 PM
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#16 | ||
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Starter Motor
Join Date: Jun 2015
Posts: 3
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So I reset the battery and went over the bolts. No change in problem. Car dose seem to run a bit better when idling until I take off and it seems like it's got a miss in one of the cylinders.
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14-06-2015, 02:40 PM
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#17 | ||
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Au Falcon = Mr Reliable
Join Date: Sep 2009
Location: North West Slopes & Plains NSW
Posts: 4,076
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Hi there, the ecu will take about a week or two to relearn. If not better after the relearn period, give it a full service & go from there. Get a ecu scan & see what codes are about. Good luck!
cheer's, Maka
__________________
Ford AU Series Magazine Scans Here - www.fordforums.com.au/photos/index.php?cat=2792 Proud owner of a optioned keeper S1 Tickford Falcon AU XR6 VCT - "it's actually a better-balanced car than the XR8, goes almost as hard and uses about two-thirds of the fuel" (Drive.com 2007) |
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12-07-2015, 06:43 PM
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#18 | |||
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MysTiC...
Join Date: Mar 2014
Location: Melbourne, VIC
Posts: 174
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Quote:
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MR-GHIA
3rd Car,  hoping and still looking, XR50T or FPV F6 2nd Car, sold  2010 Ford Falcon XR6 FG in ~ Mystic ~4.0L 6 Cyl. N/Asp Eng. 5-Spd ZF Auto 1st Car, sold 2007 Ford Fairmont Ghia MkII BF in ~ Flare ~4.0L 6 Cyl. N/Asp Eng. 6-Spd ZF Auto |
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Replacing Intake Manifold Gasket
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