AU I intermitent idle issues

NC_Lane · 20-04-2009, 04:23 PM

I'm having some intermittent idle issues on my Series 1 Falcon.

When first stated on the morning the car runs fine for a while.
Then the idle starts do drop and recover. Power is reduced. This happens when its in N or P or Drive.

Air filter is clean. Checked all the piping to the bbm and it all looks clean as well.

Put in half a bottle of injector cleaner about 100ks ago and it appears to behave a bit.

Anyone have any ideas?

I have a spare MAF lying around.. Maybe i should try changing it?

Thanks./...

JC · 20-04-2009, 05:27 PM

Quote:

Originally Posted by NC_Lane

I'm having some intermittent idle issues on my Series 1 Falcon.

When first stated on the morning the car runs fine for a while.
Then the idle starts do drop and recover. Power is reduced. This happens when its in N or P or Drive.

Air filter is clean. Checked all the piping to the bbm and it all looks clean as well.

Put in half a bottle of injector cleaner about 100ks ago and it appears to behave a bit.

Anyone have any ideas?

I have a spare MAF lying around.. Maybe i should try changing it?

Thanks./...

The MAF won't do much good - the 6s don't have one (they do have a TMAP sensor though).

If it's changing when warm, then I would say it is more likely to be O2 sensors, but you could change the TMAP first (it's under the TB on the AUs, not on the firewall like the E series ones were)

NC_Lane · 20-04-2009, 05:30 PM

Thanks.
Where abouts are the 02 sensors in the AUs? dont have a manual for one :(

JC · 20-04-2009, 05:32 PM

Quote:

Originally Posted by NC_Lane

Thanks.
Where abouts are the 02 sensors in the AUs? dont have a manual for one :(

Same as every other car - screwed into the exhaust manifold, sort of down near the cat (there is only one on the I6).

Also, have you tried cleaning the ISC valve? It's part of the TB. GK has a good write up on how to clean it.

NC_Lane · 20-04-2009, 06:14 PM

Quote:

Originally Posted by JC

Same as every other car - screwed into the exhaust manifold, sort of down near the cat (there is only one on the I6).

Also, have you tried cleaning the ISC valve? It's part of the TB. GK has a good write up on how to clean it.

Thanks

NC_Lane · 23-04-2009, 10:11 AM

Cleaned out the ICS and the TB. No Luck. After that I tired removing the plug for the ICS. Car starts and stops imediately.. Isnt iy supposed to stay on??

NC_Lane · 23-04-2009, 10:11 AM

Also the TB appears to be completely closed when the car is off.

JC · 23-04-2009, 10:27 AM

Follow this link to find out more about the IAC/ISC. Bacially, disconnect, and adjust the screw until it idles, then reconnect and you should be good to go.
http://www.fordforums.com.au/showthr...ighlight=Valve

NC_Lane · 23-04-2009, 10:37 AM

Thanks Mate. will gibe it a go tomorrow..

NC_Lane · 27-04-2009, 09:54 AM

Adjusted the idle still the same issue. doesnt make a difference if the plug is disconnected either.. Coud it be a fuel pump or should i change the Oxy sensor first?

JC · 27-04-2009, 09:57 AM

Quote:

Originally Posted by NC_Lane

Adjusted the idle still the same issue. doesnt make a difference if the plug is disconnected either.. Coud it be a fuel pump or should i change the Oxy sensor first?

If disconnecting the ISC doesn't make a difference, then I'd say that's your problem. If you have amate with the same car, see if you can do a swap, or source one from the wreckers.

NC_Lane · 27-04-2009, 10:22 AM

Sorry Just clarifying When the ICS is connected again the RPM goes up to abt 1000. Doesnt make a difference on the idle issue,,,,

Got a spare at home (used) Do you need any speical sealer or gasket pit in if im changing it?

JC · 27-04-2009, 11:47 AM

Quote:

Originally Posted by NC_Lane

Sorry Just clarifying When the ICS is connected again the RPM goes up to abt 1000. Doesnt make a difference on the idle issue,,,,

Got a spare at home (used) Do you need any speical sealer or gasket pit in if im changing it?

You should be able to pull it off and put the other one one using the same gasket.

But if it works as you've described, then I doubt it's the issue. Really sounds like an air leak somewhere. Have you checked the inlet manifold to head bolts? They have a tendency to work loose.

NC_Lane · 27-04-2009, 12:14 PM

Nope.. Will check those.. Thanks

JC · 27-04-2009, 01:32 PM

No worries - as you may be able to tell, diagnosing and fixing an idle issue over the internet is hard to do; it's a process of elimination, unfortunately.

StealthAu · 27-04-2009, 07:17 PM

Quote:

Originally Posted by NC_Lane

I'm having some intermittent idle issues on my Series 1 Falcon.

When first stated on the morning the car runs fine for a while.
Then the idle starts do drop and recover. Power is reduced. This happens when its in N or P or Drive.

Air filter is clean. Checked all the piping to the bbm and it all looks clean as well.

Put in half a bottle of injector cleaner about 100ks ago and it appears to behave a bit.

Anyone have any ideas?

I have a spare MAF lying around.. Maybe i should try changing it?

Thanks./...

I've had the same issue for quite some time now myself. I still don't know what fixes it but can advise what hasn't

New spark plugs
new leads
new o2 sensor
injector cleaner
cleaning the throttle body
air filter
oil/oil filter/fuel filter
new exhuast (inc cat)
new coilpack
new injectors
ecu retune
tighten manifold
new (second hand) engine/manifold/throttle body/icv/map
new icv
new battery

So what is left that could be causing this issue? Fuel pump comes to mind but I find unlikely as it seems to hold up on at peak power with 10psi of boost, other thing that has come to mind is a bad earth, but then why would it only happen on rare occasions at idle?

I've decided the issue is the car is possessed, only fix is a replacement (or exorcism)

NC_Lane · 29-04-2009, 02:00 PM

Quote:

Originally Posted by StealthAu

I've had the same issue for quite some time now myself. I still don't know what fixes it but can advise what hasn't

New spark plugs
new leads
new o2 sensor
injector cleaner
cleaning the throttle body
air filter
oil/oil filter/fuel filter
new exhuast (inc cat)
new coilpack
new injectors
ecu retune
tighten manifold
new (second hand) engine/manifold/throttle body/icv/map
new icv
new battery

So what is left that could be causing this issue? Fuel pump comes to mind but I find unlikely as it seems to hold up on at peak power with 10psi of boost, other thing that has come to mind is a bad earth, but then why would it only happen on rare occasions at idle?

I've decided the issue is the car is possessed, only fix is a replacement (or exorcism)

did you wack in a new engine as well

NC_Lane · 29-04-2009, 02:10 PM

Can 02 sensors be swapped between cars with out issues?

Ihave 2 series 1 AUs so i can try that. Is there any special sealer or somethign i need to use if im to do this?

JC · 29-04-2009, 05:40 PM

Quote:

Originally Posted by NC_Lane

Can 02 sensors be swapped between cars with out issues?

Ihave 2 series 1 AUs so i can try that. Is there any special sealer or somethign i need to use if im to do this?

Yes, you can swap them around without issue; I'd use some anti seize on the threads so you can get them back out. If you don't have any, then when you do them up, don't over tighten them.

O2 sensors don't kick in until the car is warm so maybe this is your issue.

scorpio39 · 29-04-2009, 08:02 PM

I suffered with the same problem for years on a dual fuel.
Changed plugs, oxy sensor, tightened inlet manifold bolts without sucess.
Then I came accross a friends petrol Au with a similar problem.
On examination I found both engines had leaked coolant from the thermostat housing onto the manifold gasket thus causing a deterioration , above and below.
Using a small wire brush I removed the gunk and completely sealed the area with silicon.
To date the idle is fine on both fuels !!!

StealthAu · 29-04-2009, 10:37 PM

Quote:

Originally Posted by NC_Lane

did you wack in a new engine as well

Re-read my list.....engine is towards the bottom of it.

NC_Lane · 01-05-2009, 11:42 AM

Ok this apperas to be sorted now..
Decided on wednesday night to give it a good once over.

Was checking the plugs and one of the leads just snapped in 2.

Replaced all the leads and plugs yeterday and it appers to be ok now..

Thanks for all you help

JC · 01-05-2009, 01:17 PM

Quote:

Originally Posted by NC_Lane

Ok this apperas to be sorted now..
Decided on wednesday night to give it a good once over.

Was checking the plugs and one of the leads just snapped in 2.

Replaced all the leads and plugs yeterday and it appers to be ok now..

Thanks for all you help

Quite often it's the "simple" things like this!