GolfGTIforum.co.uk
Model specific boards => Golf mk5 => Topic started by: Robin G on 13 June 2010, 22:05
-
Hi everyone,
I have owned my MK V for several months now, I have noticed when you first start up the car it seems to chug a little when you are at low revs in first or second gear. Also once it has been running a while, and idles the engine doesnt seem to tick over as it should??
Are these 2 things possibly related?? I was thinking about spark plug / leads??? or the throttle sensor for the chugginess !! maybe it only cause the car is cold ???
Any views....... Anyone..... thanks.
-
PCV valve dodgy??, normally causes poor idle speed, Smell of fumes inside the cabin, and lumpy starting.
-
Thank you, could you tell me a little bit more about the PCV valve ?? what is it, where is it etc ! thanks......
-
The throttle body may be full of carbon/dirt, you can try removing it and giving it a clean out. And see how it goes from there. If you lift the engine cover you will see it at the back right hand corner, there should only be 4 screws holding it down to intake manifold. Failing that, send me your chassis number through and I'll put it into else on the works vag machine and I'll check tpi's (common reported faults)
-
^^^^^^^^^^^^^^^^^^^^^^^^^^^
We like you already :smiley: :smiley: :smiley: To be fair though we like everyone
-
Thank you, could you tell me a little bit more about the PCV valve ?? what is it, where is it etc ! thanks......
Its under the airbox, basically its a rubber diaphragm which helps keep the crankcase pressurized. If it splits, especially if your car is remapped, its known to split and vent via a tiny hole in the PCV housing into the engine bay, you would smell it in the cabin if it was leaking. I had to change mine with this very issue. I noticed a tiny hissing sound AFTER the ignition was shut off under the airbox. PCV was £29 from VW dealer.
-
Thank you, could you tell me a little bit more about the PCV valve ?? what is it, where is it etc ! thanks......
Its under the airbox, basically its a rubber diaphragm which helps keep the crankcase pressurized. If it splits, especially if your car is remapped, its known to split and vent via a tiny hole in the PCV housing into the engine bay, you would smell it in the cabin if it was leaking. I had to change mine with this very issue. I noticed a tiny hissing sound AFTER the ignition was shut off under the airbox. PCV was £29 from VW dealer.
What sort of smell would you get in the cabin?
Also, what affect would a dodgy PCV have on performance at road speeds? My car is sometimes lumpy on start up, but has never had a misfire or lumpy idle.
-
^^^^^^^^^^^^^^^^^^^^^^^^^^^
We like you already :smiley: :smiley: :smiley: To be fair though we like everyone
thanks mate appreciate that. I've been on plenty of forums before that don't help out much so I know what it's like to be stuck with something. I might aswell put some experience towards helping others out. I've got access to elsa at work so if anyone needs anything like radio codes or tpi's(common reported problems) checked, send me your chassis through and I'll see what I can do
-
Sweet
-
Thank you, could you tell me a little bit more about the PCV valve ?? what is it, where is it etc ! thanks......
Its under the airbox, basically its a rubber diaphragm which helps keep the crankcase pressurized. If it splits, especially if your car is remapped, its known to split and vent via a tiny hole in the PCV housing into the engine bay, you would smell it in the cabin if it was leaking. I had to change mine with this very issue. I noticed a tiny hissing sound AFTER the ignition was shut off under the airbox. PCV was £29 from VW dealer.
What sort of smell would you get in the cabin?
Also, what affect would a dodgy PCV have on performance at road speeds? My car is sometimes lumpy on start up, but has never had a misfire or lumpy idle.
remove your oil filler cap and sniff inside... thats the smell.
-
Thank you, could you tell me a little bit more about the PCV valve ?? what is it, where is it etc ! thanks......
Its under the airbox, basically its a rubber diaphragm which helps keep the crankcase pressurized. If it splits, especially if your car is remapped, its known to split and vent via a tiny hole in the PCV housing into the engine bay, you would smell it in the cabin if it was leaking. I had to change mine with this very issue. I noticed a tiny hissing sound AFTER the ignition was shut off under the airbox. PCV was £29 from VW dealer.
What sort of smell would you get in the cabin?
Also, what affect would a dodgy PCV have on performance at road speeds? My car is sometimes lumpy on start up, but has never had a misfire or lumpy idle.
i didnt have issues with performance, only idle and start ups
-
@ Saint Steve - thanks for replies.
I've had the car a year now (it's done 55k miles) and in all the time i've had it, it's always had an intermittent issue of being a bit lumpy on start up, although only for a second. I changed the plugs but it made no differnce. I've never had issues with a lumpy idle.
I don't get an engine oil smell in the cabin, but I have noticed over the past few months that when the engine is warm (i.e. after a journey) there is a slight engine oil smell from the outside of the car, particuarly if I lift the bonnet. The engine bay appears to be dry, it doesn't leak on the driveway (or undertray) and oil consumption is normal. Could this be the PCV causing the smell? Perhaps early stages of failure?
Not sure if it's connected, but the cambelt was done recently.
All in all, the car drives A1 though.
-
The Rubber diapragm on mine was leaking to the outside of the casing and had not actually torn. But i kept getting engine vapour smells into the cabin.
Its really easy to replace, hardest part if you havent before is removing the airbox. The valve is under £30 from vw, and if it hasnt blown, its worth also checking it cus it normally gunks up with congelled oil and sludge which does aid the engines breather system.
Mine had done 45k when i changed mine.
I helped someone else with simular issues and his was cured by this aswell..
http://www.mk5golfgti.co.uk/forum/index.php/topic,15111.0.html
-
I get the exact same problem. Cold start is so lumpy that i have to give her some gas to get her going in the morning.
I don't get the idle problems though. It does idle ever so slightly high - a little over 1000 RPM. I also have not noticed any smells in the cabin.
Would you think this is a PCV related as well Steve?
Saw you on the road again the other day btw :grin:
-
Might starts up ok, little squeak, think its the Alternator belt.. But once warm, the idle is a little jumpy and all over place, not loads , but enough to hear the engine and exhaust note flutter.
Might just change my PCV valve anyway, probably clogged.
-
^^squeek will be the cambelt tensioner johnford60 . Goes when warm, but sounds like a loose fanbelt when cold.
Since ive changed my Pcv shes fine on cold starts now, but mine always used to hate waking up in the morning, used to stuter and fart for a few seconds, and then it would settle, and thats just me, let alone the car :laugh:
Where abouts flyingzard. Gota feeling i clocked you aswell, 58 plate black isnt it?
I remember thinking i saw you but dam if i can remember where it was :smiley:
-
Its only a 1/2 secound squeak sound? While engine is turning over
-
^^squeek will be the cambelt tensioner johnford60 . Goes when warm, but sounds like a loose fanbelt when cold.
Since ive changed my Pcv shes fine on cold starts now, but mine always used to hate waking up in the morning, used to stuter and fart for a few seconds, and then it would settle, and thats just me, let alone the car :laugh:
Where abouts flyingzard. Gota feeling i clocked you aswell, 58 plate black isnt it?
I remember thinking i saw you but dam if i can remember where it was :smiley:
Sholing end of Hinkler road. I did wave :wink:
These PCV thingy's easy to fit - i aint no mechanic :laugh:
-
easy peasy. Takes about 20 minutes all in
-
easy peasy. Takes about 20 minutes all in
Any guides around steve, mine is getting more shaky by the day. I get the occasional smell of oil, its really shaky at 1200rpm when cold and a little bit shaky once warm. Not noticed any performance losses or an increase in fuel consumption but I'm thinking this is worth changing especially as its just had a service and cambelt and waterpump change and its not changed at all
-
i dont know of any, but Hurdy may know of where to direct you. I havent a scooby. If youve removed your Airbox, its only 4 bolts and 2 small hoses, and its off. It bolted to the side of the rocker box. Really easy. Airbox removal is just as straight foward, but be gentle with it when pulling it off the top of the engine.
He'll most proberly recommend the BSH fix kit.
-
i dont know of any, but Hurdy may know of where to direct you. I havent a scooby. If youve removed your Airbox, its only 4 bolts and 2 small hoses, and its off. It bolted to the side of the rocker box. Really easy. Airbox removal is just as straight foward, but be gentle with it when pulling it off the top of the engine.
He'll most proberly recommend the BSH fix kit.
Cheers mate, I prefer the oem solutions. Do you not need to remove the engine cover? Also did you replace the breather pipes and the orange rubber gasket?
Cheers,
Ryan
-
No just the Pcv housing where the diaphragm sits inside. Orange o rings where fine
-
i dont know of any, but Hurdy may know of where to direct you. I havent a scooby. If youve removed your Airbox, its only 4 bolts and 2 small hoses, and its off. It bolted to the side of the rocker box. Really easy. Airbox removal is just as straight foward, but be gentle with it when pulling it off the top of the engine.
He'll most proberly recommend the BSH fix kit.
Steve, when you say airbox do you just mean the whole engine cover/intake assembly? I've had that off plenty of times. Am I right in thinking that if I have the replacement part in front of me i'll be able to spot original one quite easily?
I'm fairly handy with stuff and it sounds pretty easy but it's always nice to have an idea about the job before you start.
Cheers mate
-
i dont know of any, but Hurdy may know of where to direct you. I havent a scooby. If youve removed your Airbox, its only 4 bolts and 2 small hoses, and its off. It bolted to the side of the rocker box. Really easy. Airbox removal is just as straight foward, but be gentle with it when pulling it off the top of the engine.
He'll most proberly recommend the BSH fix kit.
Steve, when you say airbox do you just mean the whole engine cover/intake assembly? I've had that off plenty of times. Am I right in thinking that if I have the replacement part in front of me i'll be able to spot original one quite easily?
I'm fairly handy with stuff and it sounds pretty easy but it's always nice to have an idea about the job before you start.
Cheers mate
Yes mate, the engine cover contains the air filter :wink: as soon as you take it off , look at the rocker box (top) and its in the middle towards the front :wink:
Let us know how you get on :smiley:
-
Is it a butterfly type valve as in the MK4 PCV valve. If so it should be possible to give it a good clean?
I am surprised that it has clogged up assuming it is that as my car has only done 13000 miles :huh:
-
Is it a butterfly type valve as in the MK4 PCV valve. If so it should be possible to give it a good clean?
I am surprised that it has clogged up assuming it is that as my car has only done 13000 miles :huh:
doubtful tbh at such a low mileage. although if its remapped, i would.
-
i dont know of any, but Hurdy may know of where to direct you. I havent a scooby. If youve removed your Airbox, its only 4 bolts and 2 small hoses, and its off. It bolted to the side of the rocker box. Really easy. Airbox removal is just as straight foward, but be gentle with it when pulling it off the top of the engine.
He'll most proberly recommend the BSH fix kit.
Steve, when you say airbox do you just mean the whole engine cover/intake assembly? I've had that off plenty of times. Am I right in thinking that if I have the replacement part in front of me i'll be able to spot original one quite easily?
I'm fairly handy with stuff and it sounds pretty easy but it's always nice to have an idea about the job before you start.
Cheers mate
Yes mate, the engine cover contains the air filter :wink: as soon as you take it off , look at the rocker box (top) and its in the middle towards the front :wink:
Let us know how you get on :smiley:
Cheers mate. Ordered the part, will let you know how I get on. If there are no pictorial guides on how to do the job, perhaps I should do one????
-
Yes please as i shall be embarking on this job ASAP as well :smiley:
Going to have a look at my existing one first to see if it will clean up assuming that is possible of course.
-
The diaphragm is enclosed in a circular housing which if you open it up, you wont be able to put back together, so best to get new one and then prise open with a screwdriver to look at the Rubber Diaphragms condition.
Mine when it went was leaking between the two halfs of the housing, rather then it actually having a tear or split in it.
-
Just popped to my dealer and luckily had one in stock. Just took 20 Mins to fit (most the time was trying to get the engine cover on properly and I still don't think it's on perfect)?!
Idle is perfect on a hot engine, not a single wobble. Don't know if it's my imagination but I'm sure the car sounds a bit different and boosts a little differently?
Biggest test will be later when it's cooled down and see if it wobbles when at 1200rpm which is when it's been bad previously.
Was expecting to see oil everywhere when I opened the bonnet, I have no confidence in my mechanic skills!
-
^^ Happy days!!
It made a difference to mine for sure.
Glad this helped :smiley:
-
^^ Happy days!!
It made a difference to mine for sure.
Glad this helped :smiley:
Yes cheers Steve.
The only issue i thought i had was the wobble at idle but it's so much crisper at low revs now and when pulling away in first, must have deteriorated over time to a point where i didnt notice it. People often talk about a funny noise/feel at low rev's in 1st or reverse gear at biting point - It's gone now??
-
Any News on yours jaydubveedub ??
-
Not yet. I've ordered the part through a mote of mine who works for VW (nice discount!) but it does take a bit longer as he has to raise paperwork etc to get his discount.
Unlikely to have the part before the weekend and am on holiday next week.
The 'slight wobble' at idle and lumpiness in 1st gear that winyra describes all sound very familiar to me, so I hope that replacing the PCV will help my car too. I'll report back! (eventually).
-
I have just ordered the part as well although the car started perfectly this morning...... typical :laugh:
Will be fitting it on sat so i will report back after a copuple of cold starts. I cannot imagine the valve is clogged up as it a low mileage car but i have a feeling that the diaphram is split. The car never has been a good starter when cold so maybe the PCV value was suspect from day one.... here's hoping! :rolleyes:
-
UPDATE.
Starting from cold there feels like there is still the odd wobble for a few secs although I'm sure it has always had that from new. It's certainly nowhere near as bad as before and once warmed up is perfect. The car is definitely more driveable at low speeds and low rev's, I'm now hoping i can get a few more miles out of a tank of fuel :cool:
I've also stumbled upon a guide for anyone who is not sure how to fit it. Removing the engine cover is nowhere near as difficult as i'd feared, I found pulling from the right hand marker was the easiest way to remove it
http://vagdrivers.net/forums/index.php?showtopic=40537
-
Thanks Winrya that will help loads when i fit mine on sat :smiley:
-
Cheers for the link, very useful! :wink:
-
Replaced mine on Sat. Bit of a work up getting the engine cover off but managed it in the end.
Made no difference though. Car still does not want to know when cold. It could be the fuel pump is struggling - maybe a bit of air block.
Right out of ideas now. Maybe a trip to the stealers is on the horizon :sad: