GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: Rob Zombie on 20 December 2012, 08:49
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Hello Guys,
I've just noticed a small loss of PSI on my mk4.
It used to peak at 19 - 20 and sit @ 15 psi however yesterday I noticed it only peaked at 15 and drops to 10-12...
I'm a little concerned.... The car has the ECS N75 valve on.. can anyone think of any reasons why it would suddenly drop PSI?
Would it be due to the weather etc?
Cheers
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Just been on the phone to Storm Developments. i told him both ym ABS and Traction Control lights popped on the other day and he said it sounds liek the MAF is faulty. He's advised to unplug the MAF and see if the car boosts back to it's original reading of 20 psi.
If not i'll have to get it down to Storms so they can plug her in.... :sad:
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If you run with the MAF sensor unplugged it won't hit any more than about 6psi as it will run on set "get you home" values
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oh right... I was told by Carl from Revo and the fella from Storm to unplug the MAF...
what's the quickest way of seeing if it's the MAF - I'm due to take it to "The Phirm" tomorrow if nothing comes of this...
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VAG COM is the only way really, you can compare requested and actual boost values then
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okay mate - thanks for that. I'm taking it to "the Phirm" in Hartly, hopefully they can diagnose the problem.
I've heared a lot of people saying the ECS n75 valves are no good - might be worth swapping for a standard valve do you think?
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Might be worth a go. Has it happened since you fitted the valve?
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I purchased the car with the valve already on. The fella said it boosted his initial boost peak by 3 psi.
I hadboth the ABs and TC light come on the other day that i've read do indicate the MAF is on it's way out. They ahve now gone out then - but this problem has only occured since yesterday - like someone has remvoed the stage 2 remap completly.
So remvoing the MAF plug won't really help me out at all?
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Usually taking the plug off is a way of testing the MAF if it's running really lumpy etc. In your case I think the only real way to see what's happening is some real time logs on VAG COM. MAF and boost values would be a good place to start
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Yeah your probably right... i wonder if they have VAG COM at The Phirm - Being a VW performance center i'd hope so lol!!
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Update:
Took it to the phirm today - good bunch of lads and really helpful!
Found that the turbo outlet piped was hanging off! The forge pipe looks like it was cut just a little too short!
Luckily my bro replaced his mk4 engine not too long ago so I stole his pipe.
It must has been placed on there wrong in the first place as I'm now getting 21 psi as apposed to 20.
They also advised me to change the forge splitter valve to the forge 007... Whorls everyone else agree?
Cheers
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yep splitters aren't great. Glad to hear it's sorted
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Worth going for the the recirculating valve then? Will it boost performance atall? I know these splitter run at something like 80% recirc 20% atmospheric :s
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It apparently helps between gear changes as you can get a slight hesitation with the splitter
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I've now stiffend the spring up and it's running at a full on recirc valve - holding boost even more now -
I've done a bit of reading on the split r valve and I can't really see why it should perform any differently than the 007p if its running on full recirc. I guess the the fact you have to adjust the splitter makes the 007p simple
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I've also decided to modify the pcv and run a catch can - just want to remove all those pipes! Really interested to see if I have any leaks there - as my boost is peaking but the rapidly decreases until I change gear
Just ordered the following
42 draft stealth catch can - http://www.awesomegti.com/car/vw/golfmk4/42-draft-stealth-oil-catch-can-golf-mk2-mk3-mk4 - this once come with 19mm connectors so really happy that I didn't have to order it from overseas!
Also ordered
6 x new hose clamps
2 x meters of 19mm ID oil resistant hose
2 x 19mm straight connectors
1 x plastic t peice
I think that's all I need for this set up... I'll take a few photos once its done :)
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boost decreases as the revs increase through the gears...
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Yes of course - sorry that wasn't explained very well - it just not boosting like it did when I picked it up. I thought if I was going to keep it for a few years I'd make this mod now to simplify things like maitience ink the future. Plus the section jet jump keeps falling apart :s really annoying
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ah fair point. Being an AGU mine didn't have all that crap lol
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Haha! Luckily pats guide is with the AUM - so pretty lucky there!
I'm still a bit sceptical of taking the pcv vacle out completely. It won't effect MOTs for sure?
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Definitely not mate, I've passed an MOT with mine out and it emissions were fine
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Wazzzer - you been a great help fella - cheers!
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Take it out, the sad thing is the AUM had a bunch of crap added to meet euro 2000 emission standards, such as the SAI, which goes wrong, either the pump itself or a valve, again removing it will do no harm and still pass you during the mot as it only serves a small function during start up, that in no way would effect emissions.
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that's good news then - Just waiting on my parts now. Looking forward to pulling it all out to be fair. The suxtion jet pump keeps falling apart everytime I feel like giving the car some beans which is terribly annoying!
Took me a while to fine a decent Catch Can with look OEM and was 19mm - found the Draft 42 one on awesome GTI - looks really nice but is on the pricey side :sad:
One question about the catch can install - I would like to run the 1 vacum line for the brakes like Pat does in his "how to" guide... Looks really nice after he reconfigures the pipe... do you thinks he's just revised this with further 19 ID pipe?
(http://i4.photobucket.com/albums/y127/patb303/PCV/IMG_0376.jpg)
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19mm would be too big for that pipe, I reckon it's prob only 12-14mm ID...
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i'll just stick something in there to block it off until i can get some more pipe then...
Dam Christmas time! couriers take forever lol!
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You can get it looking quite OEM too
(http://img.photobucket.com/albums/0803/WesRS/SDC14300.jpg)
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i like that - i would have chosen black pipes if i did the work after i purchased it.
this is mine at the moment (excuse the circle) - will look nice with an OEM style can in there.. and if i take of the dam forge sticker :P ... i do need a strut brace :undecided:
(http://i1232.photobucket.com/albums/ff366/robbeasley/problem_zpsfe67c896.jpeg)
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Just sorted out the catch can - looks real nice in there now and no more annoying suction jet pump!! Ill get some pictures up ASAP :)
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So this is what I ordered. Stealth catch can, 19mm ID oil resistant hose, 19mm barbed T piece and some new clips
(http://i1232.photobucket.com/albums/ff366/robbeasley/F6DA20F9-7F40-4CC8-9A41-1D17D53E07D6-3872-000004A197237241.jpg)
So took out the bracket and started moving the pipes out - Pcv valve was completely clogged up with pure filth! So was the upper breather etc. as I expected its was a newer AUM than pats guide so it also had this vac pipe leading from the jet suction pump to the TIP
(http://i1232.photobucket.com/albums/ff366/robbeasley/6F5CDA15-32F3-4B65-9CE9-E45CB0312AC0-3872-000004A1A2AA1F3E.jpg)
Also I had 2 vac intake nipples under the mani
(http://i1232.photobucket.com/albums/ff366/robbeasley/61F8C147-CFBA-4C73-A55B-C4EB08E64867-3872-000004A4C8C05605.jpg)
So I decided to block of both and remove the vac line from SAP to TIP. I left the line installed incase it didn't go to plan .... Will fully remove tomorrow while detailing the engine bay!
So next I added the vac lines and happy days! Nice snug fit ! Now need to fix a bracket to the front!
(http://i1232.photobucket.com/albums/ff366/robbeasley/5E5D3986-A89B-4195-9058-1EF71EFBD13E-3872-000004A25ECBC687.jpg)
Bracket fitted . Gunna spray it black! Need to give the bay a clean tomorrow and order more pipe to sort out the blanked off booster pipe... Engine cover is to be trimmed down on the morning as it was getting dark!
(http://i1232.photobucket.com/albums/ff366/robbeasley/3D5A19E0-7A03-4975-9AF7-F45491332926-3872-000004A26F945E81.jpg)
So I now she idles lovely! Better mpg ,and hold full boost longer! Very happy with the results!
Will upload some decent pics tomorrow showing full result :)
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When I blocked off both of the vacuum lines under the manifold when fitting the catch can, I did about 10-20 miles then white smoke was poring out the exhaust when I came off boost, so I connected the line going from the manifold to the TIP and no more white smoke, saying that mine is an AUQ so yours might be different
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The problem I have is the mani to te tip seems to be connected by the suction jet pump valve - which keeps falling apart. :/ ill keep an eye on it .
When you say pouring out - do you mean literlly thick white smoke / plumes etc?
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All cleaned up and looking good
(http://i1232.photobucket.com/albums/ff366/robbeasley/AC90299A-7CF9-492C-9A78-8AC4E7D0070A-4388-00000551EDEA7119.jpg)
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Nice job mate, just need to get rid of that brake booster Y piece now
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Yea in ordering some more pipe this week - that y piece just looks nasty now :sick:
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The problem I have is the mani to te tip seems to be connected by the suction jet pump valve - which keeps falling apart. :/ ill keep an eye on it .
When you say pouring out - do you mean literlly thick white smoke / plumes etc?
exactly what i mean lol
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i don't seem to have this problem with mine as of yet.... she's running peachy :cool: