Question about 2001 Volkswagen GTI

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Intercooler leak No boost whatsoever from my gti 1.8T Can this be repaired? Can I change to a front mounted intercooler without modifications to the front end??

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Hi, the only real way forward is to get the fault codes read from the on-board diagnostic system. In the meantime, you could check for clogged /loose / fallen off vacuum pipes and splits in the intercooler pipework.

Hope this helps. If this "fixes ya", I'd appreciate a rating for my reply, If not, please delay the rating and add a comment with any extra info you have and I will try to think of something else.

Cheers, D.

Posted on Jul 11, 2008

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Hi if your boost gauge is still showing that there is boost pressure, but you cant hear the turbo working. there are two hoses behind the engine by the turbo the thinner vaccume hose is right by the down pipe and can easily be damaged by the heat from the exhaust. or due to the heat it can stretch and slide out from under the hose clamps the best solution is to purchase a samco boost hose kit they cost around $220.00 to $240.00, and will most likley be on backorder for 6 to 8 weeks nomatter where you buy it from because the Mk IV gti is getting old and the demand isn't what it once was. the cheaper solution, and the solution I used on my car was to spend $1.79 on a 4 pack of hose clamps at the hardware store and reattatch the hose while I wait for my boost hose kit. it will also help to buy exhaust wrap tape wich insulates your downpipe and keeps heat away from your engine, and turbo hoses. I hoped this helped. If your boost gauge isn't showing any boost i am not sure what to exept examine the whole enging compartment while the engine is running and feel along all of the hoses looking for a leak. depending on your mileage on the car you could just need a new turbo charger. the cheapest I have found them is at a new borg warner K03 sport is $798.00 and about $40.00 more with the instalation hardware. they also have the K04, and K05 but you need to upgrade a lot of other engine componants to handle the larger boost.

Posted on Nov 13, 2008


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if you follow the big hose that comes off the left hand side of the intake manifold it leads downward to the side mounted intercooler. The MAP sensor is bolted onto the inner side of the intercooler. You have to unscrew the inner wheel well cover on that side and remove the front fender to get in there to the intercooler area. You can take the front wheel off or turn it full one way to get better access. The intercooler sits on the side of the car and fits between the turbocharger (mounted on the back of the engine) and the intake manifold. I'm sure there's a diy somewhere - probably a DIY for changing boost hoses. Last edited by AgGTI; 10-17-2010 at 04:13 PM.

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No power from turbo at all. Rear exhaust seal was loose but I still can't stop exhaust from leaking at this point. Turbo spins well without and signs of being loose. It does not seem to build pressure of...

tubo units get compressor drive power from the exhaust pressure acting on the turbine wheel, not after the turbine wheel so exhaust pipe /flange leaks are non effective
what you problem indicates is a holes in the intake system after the compressor wheel from bad intercooler pipes /hoses loose and or holes in the intercooler
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It may be a simple repair, possibilities are a cracked or split hose, loose jubilee clip, or cracked or split intercooler itself.

If it is in the same place as the 1.8T one (behind the passenger inner wing) then it will get a fair bit of spray and road debris thrown at it. You could repair a damaged intercooler with Araldite or some other epoxy resin if you find that's the culprit, and it will be good as new.

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