GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: BenjiC on 06 March 2006, 14:23
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Quick question from a newbie......
I've had this problem for about 6 mths. I took it to VW, who stripped it down and put it back saying that might help. It did for about a week. Now the engine management light is on all the time, and the power from the turbo comes and gos. I guess I need a new intake pipe.
Would people recommend that I went to VW to get a standard one or an aftermarket one that I've seen on various websites that claim to increase performance (although only by 5ish bhp). If so which one should I get?
Cheers fellas..... :rolleyes:
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I assume they're saying there's a leak where the rubber section mates to the lower alloy part. Not sure why vw didnt just replace it. A one-piece silicone replacement would be sure to eliminate any leaks from that area (if that's really where the problem lies). Samco make them for mk4 golfs, you can order them direct from forge motorsport. Be sure to order the right one for your car, there are 2 different ones.
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Cheers for that. I'm not sure exactly where the leak was, but I was told it was a common fault with the Mk 4 1.8t (?)
I do find it weird that the power comes and gos though?
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Can't be that common, I've never heard of it :laugh:
If under boost the rubber part bulges, it may be seperating from the alloy and leaking. Do you hear any leaky type noises when you've lost power ?
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I've never noticed any leaky noises.
To be honest I'm not much of a car mechanic, so not sure if I'd be able to tell unless the noise was obvious.
VW have quoted me £190 inc fitting to replace it. I've been quoted £160 by awesomegti in Irlam to fit an aftermarket replacement (Carbonio?). Would the Samco increase bhp at all?
It's going in for a service (70k) 0 is there anything in particular I should/ could have done to keep it healthy/ + increase performance?
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im having a similar problem :sad: ... engine magement light is on an the car feels like turbo dont kick in like it used to.. had my mate run a diagnostic says faulty boost pressure vavle?
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TAF that sounds like your diverter valve is gone (unless its the solenoid, gives a different error i think, can you post up the fault including the code?), and probably thrown the car into limp mode. You can pick a new one up from vw for about 40 notes, or get a bling forge one for about 90. 10 minutes to fit, then disconnect your battery for half an hour to reset the ECU.
BenjiC now that i'm home from work and had a proper think, the bulging under boost theory was total b*llox, since the system isn't charged yet at the inlet, any leaks would just draw more air in. That again could be throwing up error codes and causing the ECU to hold back on the boost, since more air could be entering the system after the MAF sensor.
You mentioned the Carbonio kit from awesome. That is an induction kit that basically replaces the standard airbox, leaving the stock TIP (turbo inlet pipe) in place, which has left me confused as to which part is actually faulty, since the only thing between the airbox and the TIP is the MAF housing.
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Topher I must have the kit wrong. I have a copy of the VW diagnostics check and the error reads:
"Confirmed leak on air intake pipe to turbo. Removed pipe & checked seal - found to be dirty and traces of leak spray on turbo flange"
Whatever the kit awesome quoted me on was I presume an air intake pipe for the turbo. Are there many different versions of this? If so which is the best?
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These are the error codes its showing, used 2 programs, vw tool and unregistered version on vag.com....
16486 (P0102) Mass or Volume air Flow Circuit Low Input
INTERMITTENT
17608 (P1200)---Unknown Trouble Code
17748 (P1340) Engine RPM Sensor Plausibility
INTERMITTENT
VAG-COM Version: Release 311.2-N
Control Module Part Number: 06A 906 032 DR
Component and/or Version: 1.8L R4/5VT 0002
Software Coding: 11500
Work Shop Code: WSC 00000
1 Fault Found:
17608 - Boost Pressure Control Valve (N249): Mechanical Malfunction
P1200 - 35-00 - -
Any help on this one toph is much appreciated :wink:
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BenjiC - awesome may supply either the alloy neuspeed TIP or a silicone (samco or similar) one, either will flow better over the stock item.
TAF - the N249 valve is what controls the vacuum to the DV (diverter valve). The same fault code could be thrown up if the thin vacuum hose to the top of the DV is faulty. These things get brittle and crack over time, although its not easy to spot since they have a braided cover, inspect that before spending any hard earned. If the pipe is fine, you can either replace it the N249, or bypass it. Here is a how-to guide for the bypass procedure http://www.seatcupra.net/forums/showthread.php?t=42406
Your other fault is the all-too-common MAF failure. £75 exchange unit from VW, or try cleaning it up with some carb cleaner (dont touch the sensor with your fingers!). Check the above first though, since any air leak in the system can throw up an un-metered air fault.
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Thanks i'll ave a look round the diverter as soon as i get a chance... i have had another maf sensor in there, didnt seem to make much difference?? only thing i noticed with mine was when i had the engine running, i disconected the maf sensor and the idle went down for litterally a second then went back up. I thought its doing something... maybe its ok???
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Cheers Topher. I'll go with one from awesome. I would imagine that there labour charges aren't £6billion per hour like VW anyway!