Zetec PCV Valve
Steve Kodź
Positive Crankcase Ventilation (PCV) valve on the internet. Need to get a
new one as I feel this is the problem, but I can only find links to locate
where it is on the engine (I know that by now!) or ones for the newer (Focus
generation) Zetec.
Any ideas? Tried the following sites;
ebay
GSF
Euro Car Parts
Mister Auto
Google (obviously)
If someone could supply a FINIS number or similar I'd be very grateful.
Regards,
Steve
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robert greig
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Steve
Jim Hearne
block, I'd suspect it's Ford only for that part.
Mind you, there's very little in them to go wrong, usually they are just
bunged up with gunk.
Holding it with the small pipe on the top, blow into it and no air
should go through, suck on it and it should.
You need to hold it the right way up though as the valve itself is a
steel disc and relies on gravity to close it.
You can soak it in carb cleaner or cellulose thinners to clean it.
What's the actual problem ?
If it's the crankcase pressurising make sure that the rubber "T" or
elbow hasn't collapsed where the metal pipe goes into the inlet
manifold, or that the pipe in the manifold itself isn't blocked.
Jim
On 02/03/2014 11:27, Steve Kodź wrote:
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Hamish Freeman
I am interested as this device is so simple that it should be almost
impossible for it to go wrong, the possible issues being lacquering of the
seating face or other gunge, which can be cleaned off, or fatigue and
subsequent breakage of the spring, for which a substitute can normally be
found.
It is unlikely that the effects of a faulty PCV valve would be noted on an
injected engine as the electronic governor would compensate for possible
speed fluctuation. What would be noted is a fault with the air bypass
valve, which compensates for the mixture at idle. Problems here could
induce erratic or high idle. What exactly is your problem?
Sticking to your original question however, providing the PCV from a Focus
will fit then it is likely to work OK. By now you have most likely gone
through all of the various bits of information on PCV's and will understand
that it is intended to keep a low but positive pressure within the crankcase
to keep pressure on the seals and avoid drawing in dirt through them with a
negative pressure. In simple terms the absolute level is not desperately
critical and is of the order 300 -500mm H20. Some go lower but this depends
upon the philosophy of the particular maker and will certainly vary over the
speed and load range of the engine but should always remain positive. Very
high levels would suggest excessive blowby.
Unfortunately whilst Old Q supplied a complete parts list for the components
making up my H4, I never got a parts list for the engine and the PCV valve
came already assembled with the engine.
Good Luck!
Hamish
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Geoff Ward
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Hamish Freeman
It is unlikely that you would get a perfect seal with the PCV in both directions so do not be in too much of a hurry to dismiss it. In my limited experience, the idle variation described is far too high for a PCV problem. The Drop Dead test is to fix the thing in a given position, shut is easiest by blocking the pipe, then check idle. If it still varies wildly then the problem is not the PCV valve.
As previously suggested this sounds more like an air bypass valve problem – have you checked a) its continuity, b) its movement and c) the most likely a leak in the air pipe to this device? N.B. the signal from the ECU “pulse width modulates” the position of the valve; it will not survive a steady 12 volts across its terminals. ABV problems can shift idle by a couple of hundred rev/min and are difficult to repeat on demand. Sticking or leaks are the most common causes.
Hamish
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Jim Hearne
The other thing that can cause a high idle is an air leak.
I've had the seals around the manifold end of the injectors leak air, especially if they have been removed recently.
Also, watch out if you are using Mondeo injectors in a Fiesta/Escort manifold as the seals are different sizes.
A common problem on the Zetec's is the rubber hose that joints the metal PCV pipe into the inlet manifold splitting.
A quick test for air leaks is to run a hose over the inlet manifold and anywhere else there's a gasket or pipe.
If there's an air leak the water will be sucked into the gap and the engine speed will change.
Jim
bill
Bill
The other thing that can cause a high idle is an air leak.
I've had the seals around the manifold end of the injectors leak air, especially if they have been removed recently.
Also, watch out if you are using Mondeo injectors in a Fiesta/Escort manifold as the seals are different sizes.
A common problem on the Zetec's is the rubber hose that joints the metal PCV pipe into the inlet manifold splitting.
A quick test for air leaks is to run a hose over the inlet manifold and anywhere else there's a gasket or pipe.
If there's an air leak the water will be sucked into the gap and the engine speed will change.
Jim
It is unlikely that you would get a perfect seal with the PCV in both directions so do not be in too much of a hurry to dismiss it. In my limited experience, the idle variation described is far too high for a PCV problem. The Drop Dead test is to fix the thing in a given position, shut is easiest by blocking the pipe, then check idle. If it still varies wildly then the problem is not the PCV valve.
As previously suggested this sounds more like an air bypass valve problem - have you checked a) its continuity, b) its movement and c) the most likely a leak in the air pipe to this device? N.B. the signal from the ECU "pulse width modulates" the position of the valve; it will not survive a steady 12 volts across its terminals. ABV problems can shift idle by a couple of hundred rev/min and are difficult to repeat on demand. Sticking or leaks are the most common causes.
Trevor Crittenden
Hi I had a similar problem which in the end was down to a leak in the flexible pipe coming out of the MAF sensor.
It would start well and run ok but after a while the revs (usually in an embarrassing place) increased to a similar level as yours
Trevor
bill
Regards Bill
From: trev....@virginmedia.com
To: quantu...@googlegroups.com
Subject: RE: [Quantum Owners] Zetec PCV Valve
Date: Mon, 3 Mar 2014 17:21:39 +0000
Hi I had a similar problem which in the end was down to a leak in the flexible pipe coming out of the MAF sensor.
It would start well and run ok but after a while the revs (usually in an embarrassing place) increased to a similar level as yours
Trevor
From: quantu...@googlegroups.com [mailto:quantu...@googlegroups.com] On Behalf Of Jim Hearne
Sent: 02 March 2014 17:02
To: quantu...@googlegroups.com
Subject: Re: [Quantum Owners] Zetec PCV Valve
A quick test for the ABV is to unplug it with the engine running, the engine should stall, if it keeps running then it could be the valve leaking.
The other thing that can cause a high idle is an air leak.
I've had the seals around the manifold end of the injectors leak air, especially if they have been removed recently.
Also, watch out if you are using Mondeo injectors in a Fiesta/Escort manifold as the seals are different sizes.
A common problem on the Zetec's is the rubber hose that joints the metal PCV pipe into the inlet manifold splitting.
A quick test for air leaks is to run a hose over the inlet manifold and anywhere else there's a gasket or pipe.
If there's an air leak the water will be sucked into the gap and the engine speed will change.
Jim
On 02/03/2014 15:38, Hamish Freeman wrote:
It is unlikely that you would get a perfect seal with the PCV in both directions so do not be in too much of a hurry to dismiss it. In my limited experience, the idle variation described is far too high for a PCV problem. The Drop Dead test is to fix the thing in a given position, shut is easiest by blocking the pipe, then check idle. If it still varies wildly then the problem is not the PCV valve.
As previously suggested this sounds more like an air bypass valve problem - have you checked a) its continuity, b) its movement and c) the most likely a leak in the air pipe to this device? N.B. the signal from the ECU "pulse width modulates" the position of the valve; it will not survive a steady 12 volts across its terminals. ABV problems can shift idle by a couple of hundred rev/min and are difficult to repeat on demand. Sticking or leaks are the most common causes.