GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: LukeGTI89 on 02 May 2017, 19:14
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Hi everyone,
Ive recently picked up a 51 plate 3dr gti 1.8t and im having an issue and find myself wondering if any of you knowledgeable guys or girls can help, ill describe the issue below
Basically when i drive the car from cold it runs great it boosts well and is really quick, im lead to believe it has a stage 1 map at around 200 bhp which feels fairly accurate from the power, however everytime ive been driving for about 10 mins and car os well up to temp the power drops (to what feels like the standard 150bhp) . When i picked it up the eml was on giving code p0102 for maf sensor, i unplugged the maf during a power loss episode and it seemed to work for about a mile and then reverted back to low power. This morning i swapped out the maf and cone filter for the original airbox and maf setup that i got from a pal (unsure if this maf is a dud or not) upon starting this morning it took 5 attempts to keep it running so i jumped out, unplugged the maf which was still the old one at this point and it then idled ok and ran ok apart from the power loss half way to.work. then at work i swapped to the orinal airbox setup and when i left work it idled like crap again until i unplugged maf and then same as the morning, ran ok apart from power loss 10 mins into journey. When i got home.i scanned it and got p0102 and p0340 (camshaft sensor) i erased both faults then took it out for a few mile with maf plugged in but it still had not restored power but so far the codes have not come back so im at a bit of a loss wether to try a brand new maf or not, scratching my head a little now so hopefully i can get some.ideas to point me in the right direction. Or failing that find out if there is anyone local to swadlincote, derbyshire that might have vagcom that i could use to look a little deeper into the problem as i dont have it anymore.
Thanks in advance for any responses
Luke
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Whats the engine code. The camshaft code can mean more than camshaft. I had a customer who has this code and its because the vvt doesnt work and the sensor picks this up.
Maf senaor i would check if all the wires are in the plug if 2 mafs have done the same thing.
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Im pretty sure its an aum mate, ill double check tomorrow to make sure. I get the feeling its engine managment sensor related just due to the fact its only when it gets up to temp, but since clearing the codes earlier they havent resurfaced and it started fine from cold earlier but i didnt get to take it far enough to see if the boost dropped again, tomorrow mornings journey should give me a bit more feedback i hope
Cheers
Luke
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If its an aum im sure they havnt got vvt anyway so a siple check is to make sure the cam and crank are timed correctly.
Sounds like it could need a cam sensor which only take ten minutes to change
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So the drive to work this morning seemed fine, car didnt seem to loose power today and the eml has not returned, i wonder if the old stored fault was sending it in to some sort of limp mode, only issue now is the dump valve seems to work when it feels like it, half the journey i cant hear it and then at some points it will start making noise again, could this just be on its way out and need changing do you think ?
Cheers
Luke
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Could be vac pipe split near dv.
An uprated dv is never a bad idea though. :grin:
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Can you recommend any that you know are decent as im not sure exactly which one to go for, id like something either unusal sounding or fairly loud so i can always tell if its working
Cheers
Luke
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Last one i had was a universal jobby thats now on my mums s3 and you can hear that.
Most go for a forge motorsport one. 008 i think is the version thats newest. Atay away from a splitter r valve by froge although they blow off well there a nightmare. Got one on a passat and im sure one of the seals leaks
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Ok mate thanks for the info ill get a forge i think, all seems to be well with the boost issue now ive fitted airbox and cleared codes but i am getting the camshaft sensor code coming back with no running issues and now a coolant temp sensor code also, im going to change the temp sensor asap and hopefully resolve that issue, it does look like there is a really small amount of coolant seeping from around the sensor so i expect some has gotten in and corroded the sensor or contact points but im unsure if this cam sensot fault is a red herring with there being no more running issues just yet.
Cheers
Luke
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Just means the ecu doesnt know the position of the cam so is running on crank sensor only.
Like i said there not too bad to change if you can get a cheap one second hand to try.
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Out of curiosity, if i were to fit a forge valve, would i need to worry about mapping it in or will it work with the current settings, im told that my car has a stagr 1 revo map but from what i can see that and the exhaust which is cat back i beleive with a cat delete also performed (even though the cat is still in place) are the only upgrades as of yet by the previous owners, personally i would say its 100% been mapped as no way is it standard 150 bhp, same question goes if i were to fit an fmic?
Forgive me for what might seem common sense questions but im actually a very experienced mechanic however not with turbo charged systems.
Thanks
Luke
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Wont need mapping in. Same with a front mount. If its an early agu engine it can only be chipped so theres technically not a stage 2 to go to.
I think the later obd mappable ones you can tweak a little more to get stage 2.
Of youve not drove a mk4 1.8t before id say youd think it goes well so might not have been mapped as such yet.
A good way to tell is if you have a boost gauge ypull be able to see how well it boosts. Where it boosts up til in psi and how it holds the boost. As standard the boost doesnt hold that well. Especially if the dv spring is getting weaker