MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: Saint Steve on March 16, 2010, 06:29:31 pm
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Anyone have an idea's
Have developed a missfire apon start up that clears after a few seconds??
Power still seems to be at top end, but isnt very smooth on tickover??
Hasnt been great since milly downpipe install, that i origonally posted about.
Am removing my stage 2 map to try in stock mode to see if that cures?
Any idea's??
Also when you rev the engine, its alot slower to return to idle speed of 800rpm, after you fire the engine up?
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Are your plugs fresh?
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mines going into the dealers this week for just the same reason, ill post up any findings :)
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Are your plugs fresh?
Brand new 2 weeks ago , changed on service at Vw
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also noticed, that when you shut the engine down, there is a high pitch squeel coming from somewhere in the engine bay for about 3-4 seconds after youve turned off the engine.
When you start the car, it seems like the engine is hunting, and then settles down after a few moments, but definatley when you throttle off, it takes twice as long to return to idle speed.
Does this sound like a split Diverter Valve??
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Get it vagcom,d to see if there are any faults before it goes into the dealer. My bet is either a fault somewhere with the plugs or MAF meter on the way out!
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Apon further investigation, with the bonnet lifted, there is an air leak coming from down towards the bottom of the cambelt cover, which after having a chat with the forums Mod guru, would point towards a damaged Turbo discharge pipe, which could well of been damaged acidently when my downpipe was installed. So will be calling the Garage that done it tomorow :happy2:.
Would be the reason why i wasnt happy with the cars idle speed after having the downpipe installed. fingers crossed
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fingers crossed steve :happy2:
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Hope you don't have any further problems Steve.
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Have traced the fault today to the PCV has blown, and that its crankcase pressure thats coming out of the vent to air hole in the diaphram housing on tickover.
£28 for new valve housing, arrives friday and i will fit to save a bill from Vw.
Oh the joys of remapping :fighting:
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common fault steve - you should have gone for the forge or bsh pcv fix and catch can
as it may well go again and with the uprated ones you remove alot of the crap going into the engine
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Im not convinced on a catch can James tbh .
I will continue to sit on the fence as to regards whether imo they really need a catch can.
Perhaps when i remove the old unit on friday, if its full of gunk and crap, then perhaps something will need to be installed.
This valve blowing is common as you say for mapped cars especially.
Shes not lacking in power as yet, but i will photograph whats inside it on friday to see whether a can is justified.|(43k miles)
An uprated one would be a good suggestion if it happens again, as its only £28 , i ll give another oem one a go.Part number has had a change in part number on vw's computers. Maybe its an updated version?.We shall see :happy2:
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i believe vw have updated the pcv so hopefully you should be alright
you wont see much with the pcv off - you need to delve deeper and get a look at the cylinders to see the real nasty stuff
i empty mine every other week - pretty gunky stuff comes out of it - rather out than in imo
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If you don't want the catch can then you can take one step back from it and use the pcv revamp kit http://www.bshspeedshop.com/store/home.php?cat=1119
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I shall see how long it lasts ,then if its a regular thing, then i will look t that choice. Thanks Bacillus :drinking:
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This is EXACTLY whats she's doing on tickover/Idle
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Glad you got is sorted Steve - sorry I missed your call earlier, still in a meeting at work.
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Steve,
is this something that shows up as an error code on VAGCOM / VCDS (and which code)?
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I havent got Vagcom to see if its logged, but i expect i will have fault codes showing as i briefly ran the engine without the airbox to find where the leak was coming from. Ill ask my friendly Hedgeman to bring his lappy next time i see him :smiley:.
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:angry015:
:P
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:sad1:
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:signLOL:
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Just to bring things up to speed. I replaced the Pcv housing assembly today.
Sure enough this is what greated me when i forced open the housing to have alot at whether my old valve was perhaps blocked with carbon disposits etc .Car has done 43k miles, only on 99 octane fuels and would be a good indicator imo whether a catch could be justified in my case. After seeing this, i dont think theres much need.
The rubber seal has lost shape and the crankcase pressure was being blown between casing and rubber valve, was expecting to find a tear or split, but nothing at all, and not overly oily tbh.
Car is now smooth as, even on idle slidding into gears. My thoughts are this valve 1st went wrong at Jkm when the exhaust downpipe was fitted, because it wasnt smooth on idle when i was 1st handed the keys back after the work. So only now am i happy with all works done to the car, and hopefully find some extra boost i may have been missing.
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi154.photobucket.com%2Falbums%2Fs264%2Fphilmcavity%2F017.jpg&hash=395d5b5cee8dfd17edad3b5b36372ffb9c9034ab)
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi154.photobucket.com%2Falbums%2Fs264%2Fphilmcavity%2F016.jpg&hash=e405f47c55b33a534781136dad08118b209d08d9)
:drinking:
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:indifferent:
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Late night Ian :indifferent:
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Yep. Needs me beauty sleep. :sad1:
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If you don't want the catch can then you can take one step back from it and use the pcv revamp kit http://www.bshspeedshop.com/store/home.php?cat=1119
What happens to all the gunk with this fix?
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Did you go for an OEM replacement, if so was it uprated/different to the original?
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I replaced it with another oem one Rob.It looks the same from the outside Rob, part number was superseeded though, and whether the changes are made inside around ball valve and Diaphram, i dont know.
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Steve, you say this fixed your lumpy idle, did it also solve the high pitched squeal on switch off?
Can you possibly post the part number just in case any of us get similar symptoms at some point. I take it you are a fairly confident mechanic to change this out yourself. Think I'd be off to the Indy.
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Yeah a P/N and price would be handy for reference.
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Steve, you say this fixed your lumpy idle, did it also solve the high pitched squeal on switch off?
Yes it did, what that squeeling noise was , was the air being blown via the vent to air hole in the Pcv diaphram housing.
She's quiet as now :happy2:
When it squeels , it sounds like you have a squeeky Fan belt or pulley noise.Clue is when you shut the engine off it still does it, so you know whether its a pressure noise rather then a mechanical wheel squeel if you follow :wink:
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What happens to all the gunk with this fix?
It recirculates to the intake valves like the oem pcv. This fix essentially fixes the slight boost leakage that occurs in most of the oem pcv items.
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ok
Part number is
06F129101L £26.18 each + VAT
I payed £29.10 with my 10% discount
:happy2: