Problems after remap!!!!! Any help please

[2pthemarine77]

I have a 51 1.8t AUM. I love this little car. I knew I was going to get it mapped so I'd all the preps for extra power. Clutch, Cambelt and water pump and discs and pads all round.

Spoke to the remap guy. Who I won't name as I'm sure I don't want to give him a bad rep. Yet.... LOL

Told him what I wanted I went with the pipercross panel, a Bailey DV30 recirculation valve and a decat.

With these 3 mods the car drove perfectly. It through the Engine light on once in three weeks while I was stuck in traffic and I knew what it was. I scanned and cat below efficiency cleared it and it has not come back on since.

Last night I had it mapped. Now well....... It starts and idles perfectly. When I floor it I goes like hell about 15psi which made me smile.  But when to drive it on a normal journey. It surges at half throttle about 10psi on the gauge, almost like its missing then it seemed to clear itself.  But then realised when I put my foot down it won't boost over 5psi some sort of limp mode but in this mode I drives perfect no surging and feels smooth.

Spoke to map man. He said it is probably the air flow meter as the can be prone to breaking under the extra boost. Put a genuine VW one on today it's the same. He then advised the N75 valve.

£225 map
£100 on a MAF that has not fixed it

And I had to tax it yesterday too. I am not going to throw money at it unless it fixes it.

Any ideas or had the same problem advise really really welcome.

Cheers Paul

[jamie1989]

Get it scanned mate im not clued up on AUM's but map sensors, coil packs etc can affect these problems too.

Its not always the remap its nearly always the hardware but the remap highlights the underlyin issue.

Hope this helps.

[GTi_James]

were health checks done before the remap? i know my AUM 51 needs all vac hoses modded, need to get a new TIP and at some point a new exhaust, and i did this all as per Rtech's suggestion before i even take it to them later plus the obvious brakes, filter etc etc

[2pthemarine77]

A health check was done and I scanned it with snap on modis today. It came up clear of codes. But will scan it again tomorrow. Im a bit baffled as to why it runs so well in what I can only call limp mode it still boosts to 5 psi though, and runs like it did before with good mpg. It only seems to play up under load. worse up hill.

[jamie1989]

Possible boost leak?
Crank shaft sensor made my AGU go in limp mode and boost very little?
Weak actuator (although it may still peak upto desired boost level then drop off quickly) Do you have a boost gauge installed? Does it peak at 5psi and hold there?
I would dump the baileys dv and get a forge recirculating valve or similar.

Could be anything but really differcult to diagnose without physically seeing the car and how it performs etc.

The joys of 1.8t's

[GTi_James]

sounds like a seal may of gone?

[jamie1989]

perfect guide

http://www.golfgtiforum.co.uk/index.php?topic=159156.0

Goodluck and let us know how you get on 

[2pthemarine77]

Cheers peeps I'll do some investigating and let you know.

Please keep the suggestion coming though 

[cullygti]

sounds like a seal may of gone?

  

[Chris.]

if it drops into limp mode, you WILL get a fault code,