Loss of Power

[h100vw]

Turbo lag wouldn't manifest itself as described above. I am not sure the car has a turbo fitted, I think it is the std FSI engine.

I would be interested to see what the fault code was that VW downloaded. Maybe you could find someone with VAG-COM to check it out before VW if the fault persists, then the VW community at large could get on the case too....

I would be looking at vwvortex.com to see if the fault has been reported by any owners in the states..

Gavin

[william]

its a gti its turboed so is the tdi jetta the other guy is talking about

[h100vw]

I wasn't trying to upset you William. It wasn't clear to me as he hadn't mentioned the fact it was turbo and had called it an FSI not FSIT and both engines do exist.

Anyway, I still dont think turbo lag is the problem.

The ECU might be introducing the problem in an effort to respond to a rogue input it is seeing. This would throw a code, knowing the code would help us speculate what the problem is.

Gavin


Just re-read from the top and I had missed the DSG GTI bit altogether.

[william]

no harm done mate wasnt trying to be rude merly trying to inform you

i dont know what it could be maybe misfire due to common dodgie coil packs now you can change all four coil packs underwarranty if between a certain timeframe of manufacture

[h100vw]

My experience of coil pack failures is limited but when my Seat Leon died the coil failed full stop. I just booted it it up the high street at home and the check light came on as the power vanished. I had Mr Laptop with me so scanned it and duff coil pack was the code. I went home and dragged the '88 Passat out of retirement. ;0)

It might be a bad plug but you would hope that a dealer would have the brains to throw a set of plugs in as a starting point. Even if they sat on the removed ones while seeing if it had been fixed. I am sure there is enough profit in the car to justify that expenditure.

These things aren't NASA, just common sense troubleshooting. The ECU practically tells you what is wrong with it.

Gavin
Gavin

[neo25x5]

thanks for the input all. for the record mine is the FSI non-turbo so its definitely not turbo lag. the car will be going to the dealer this week. happy to let you all know what the outcome is.

[Dr Spine]

I've got my GTI into the dealer tomorrow. Warranty job thankfully. "VW HQ" have sent a replacement valve of some sort. I'll find out the details tomorrow of exactly what it is/does and post a reply for you all. The problem hasn't happened again since I started this thread but it's not nice when you just don't have 100% confidence that it won't happen again.

I'll try to find out the original fault code for those who are interested. I've never seen a VAG-COM in action so I've got no idea how a fault code presents itself. I imagine it's just a series of numbers??

[h100vw]

http://www.ross-tech.com/vag-com/index.html

This is the famous VAG-COM.

Dealers have a similar thing with a different interface.

Gavin

[neo25x5]

got my jetta back yesterday after i left it with the dealer to check out the issue of the loss of power. unfortunately, no faults were logged by car nor could the tech replicate the issue. what we've put it down to is that i might have been covering the brake too close (i brake with my left foot). im reliably informed that when the car is in motion and with the brake depressed, the accelerator cuts out. you learn something new every day

[Dr Spine]

The dealership replaced the "fuel pressure valve"?? apparently there is a higher and lower pressure side of the fuel line?? when the valve released pressure inappropriately the engine (very briefly) didn't get enough fuel.

I'm not a tech head but I must admit that running out of petrol was exactly what it felt like when it did happen.

The problem had not happened for about 3-4 weeks but hopefully with the new valve it will never occur again.