MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: northyracing on February 25, 2013, 05:58:39 pm
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As title says really anyone know the tell tell signs if it is knackered as I am getting a judder when car is idleing but don't know if its the PCV
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Can you hear a hissing sound when you shut the engine down from the PCV valve itself?
There is a small drilling in the PCV housing and if the valve is knackered then the air from inside hisses out.
I would just disconnect the MAF, and see if the engine runs smooth.
If it runs smooth the MAF is generally ok.
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I have not really hear a hissing noise just I gets a lumpy idle and then once movin the car is fine so basically start the car up and unplug sensor and if it still runs smooth then it's ok
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Just unplugged maf and runs smooth
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Just unplugged maf and runs smooth
Sounds like you need another maf.
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i drove the car for a while got it nice and warm and it started running lumpy on idle unplugged maf and for a second engine revs dropped then back to normal and it still ran slightly lumpy at idle but noticed when driving at low speeds it felt very juddery i have replaced the dv valve but noticed one of the allen bolts but have vibrated loose would this cause a problem
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The only real way I know of to test the MAF is to log data for the intake air mass, group 002 w/vcds, and check that with your known hp. Other than that, you can temporarily swap in a buddy's to see if it solves your issue. Your intake air mass in g/s divided by 0.80 should equal your HP. For example: my air mass is 280 g/s....280/0.8=350 HP.
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i drove the car for a while got it nice and warm and it started running lumpy on idle unplugged maf and for a second engine revs dropped then back to normal and it still ran slightly lumpy at idle but noticed when driving at low speeds it felt very juddery i have replaced the dv valve but noticed one of the allen bolts but have vibrated loose would this cause a problem
Yes. It will run rough if the loose bolt creates a break in the seal.
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Been havin idle problems and juddery feeling so checked my pcv today I done the blow down the pipe test. I took it off inlet manifold side and blew down the pipe and took oil cap off and you could hear that I was blowing straight through the pcv into the engine also noticed the pipe had quite abit of engine oil in it would this suggest the pcv is naffed
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If You Can blow and Suck down that Value then it is Faulty. :happy2:
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I had abit of oil in the pipes and also when I changed dv it was full of oil surely this ain't right either
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I had abit of oil in the pipes and also when I changed dv it was full of oil surely this ain't right either
Being full or having signs of oil in it doesnt mean its faulty.As I said if you can blow and suck, the valve inside the pcv is faulty.It has a ball valve inside.
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Well put it this way I had a mate blow down the pipe and I had my ear to the oil filler cap and you could hear it inside the engine so he was basically blowing straight through the pcv
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Not to go off topic or steal ;)
Can this effect dirty diesels too ? I have a rough idle of my 2.0 TDI, its not constant or regular , just every now and then
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If You Can blow and Suck down that Value then it is Faulty. :happy2:
I just tried my pcv again and can blow and suck down the pipe with ease
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If You Can blow and Suck down that Value then it is Faulty. :happy2:
I just tried my pcv again and can blow and suck down the pipe with ease
Then it is Faulty fella :happy2:
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I am glad you said it's faulty as I ordered all the parts and was said it could be the maf. So hopefully this will make the car a plesure to drive again :happy2:with no hesitation
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replacde the pcv and still gets the juddery feel at idle so dont know what to do now
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replacde the pcv and still gets the juddery feel at idle so dont know what to do now
If you haven't already..go for a drive
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right i had my car plugged in today to find no faults what so ever not even a missfire everything working as it should but im still getting this annoying idle cant work it out and dont know what route to take now
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In reading this old topic today, I noticed a few things.
That is; blowing into the intake-to-manifold tube only tests one of three valves inside the PCV. It tests if one of the PCV valves contains boost when present. If you can blow through it, then you lose boost. The other two are what seal the crankcase when in vacuum. The diaphragm and recycle valve are shut to apply the vacuum to the crankcase. If they do not seal, then vacuum applied by the intake manifold will suck air through the PCV from the turbo inlet. Testing it requires blowing into both the intake side valve and the recycle to turbo inlet valve...both should seal. Then the diaphragm must be removed and inspected. You can check if vacuum is strong with the oil filler cap removed or the dipstick removed, but you do not know the level of vacuum without a gauge. Or, use a gauge to check the vacuum. If vacuum level is normal, the the PCV is working fine in vacuum mode.