Hi Folks. I introduced myself a few months ago. This is such a great forum for information. I started my Cougar the other morning and was somewhat shocked, to the point of WTF is that noise !!. Luckily, I had read about the dreaded moosing but as it had not occurred in the previous 4 months of ownership I thought I may have been one of the lucky ones. The car was parked in an alley between two houses so you can imagine the racket. Armed with the part number of the anti-moosing kit I thought I would go and see my local Ford dealer. £65 was quoted which had to be paid up front and he could not specify a delivery date. Thanked him for his time and left. Now going to try the inserting the extra long piece of hose solution that I read in one of the threads. Hopefully, it will do the trick.
The dreaded moose
- Thread starter Cougarbrg
- Start date
personally I prefer to fix the moosing rather than hide it with a bit of extra pipe that changes the resonance frequency 
moosing is caused by the fins in the idle air control valve blocking up with oil as it flows through in the return vapour, to fix moosing you replace the iacv to disguise moosing you change the resonance frequency of the air flow by extending a pipe.
the IACV sits at the back of the UIM and is part of the return feed system that recirculates used bad air contaminated with oil vapour. This oil vapour over time seizes up the spring inside the IACV preventing the fins opening fully, this then changes the resonance frequency of the air flow creating the moosing sound.
the IACV sits at the back of the UIM and is part of the return feed system that recirculates used bad air contaminated with oil vapour. This oil vapour over time seizes up the spring inside the IACV preventing the fins opening fully, this then changes the resonance frequency of the air flow creating the moosing sound.
Paul, does the IACV necessarily need replacing, or can it be cleaned (with carb spray or degreaser or whatever)?
I've never had mine apart so I have no idea what it looks like.
I've never had mine apart so I have no idea what it looks like.
I think you are confusing the IAC valve with the EGR valve Paul..its the EGR that recirculates back into the UIM. The IAC valve allows air to bypass the throttle body under ECU control to regulate idle speed.
You know how sometimes you read something and it looks slightly wrong not you're not sure why...?
IACV is the butterfly bypass of course. Though come to think of it, it could also end up clogged as it's downstream of the breathers and could probably benefit from cleaning too.
IACV is the butterfly bypass of course. Though come to think of it, it could also end up clogged as it's downstream of the breathers and could probably benefit from cleaning too.
No confusion mate, EGR was only fitted on the early engines, a Faulty IACV is still the cause of moosing, not sure what you mean by allowing the air to bypass the throttle body though as the air would have to go through a 90 degree turn (or path of most resistance) in order to bypass it?
I soaked my old one for 3 days in Wynn's Carb cleaner and daily manually moved the spring up and down to release it, this worked for a couple of thousand miles but in the end the moosing came back so I just replaced the unit
I believe Tony (topcat1127) did the same aswell
Genuinely confused here Paul. I thought that the whole point of the IACV was to vary the idle regardless of what the throttle itself is doing. It might be at 90 degrees to the airflow, but it's only supposed to give a low-pressure feed to the inlet.
when the throttle is closed there is a valve just below the throttle body (black plastic cylinder) that opens and allows the air to flow through the IACV allowing the car to idle, the air in the UIM gets contaminated with oil vapour which when the throttle is open gets pushed into the IACV which is what causes the spring to get gunked up, I may be wrong about the air feeding back all the way but as the black plastic cylinder is a pressure valve it makes sense to me that it will open both ways.
Thanks Paul. Makes sense and that's what I was thinking in post #12 above.
The thing that confused me was "the IACV sits at the back of the UIM and is part of the return feed system that recirculates used bad air contaminated with oil vapour" since I don't see it as part of that subsystem. Even if under high manifold pressure it may actually act that way.
Apologies if I read you wrong mate.