B5.5 1.8T 4MO - Boost Surge

[db5.5]

So I own a 1.8T 4MO 5SP, 85K on the clock running APR 93 OCT, 2.5 downpipe, 3" back with dual Magnaflows, only other engine mod is the Hyperboost DV & ITG drop in.

2 nights ago I went to start up the car when I was leaving work, when I started it, it had a ruff idle, shook then the CEL flashed, but didn't stay on. This has happened before (and I plan to VAG it tonight to see if their are any codes), gut tells me it will be an o2 or a misfire. I proceeded to let it kick-down until smooth idle, then headed out. I was merging onto the turnpike and had to romp it a bit to merge when the acceleration increased more faster than normal. Boosting was fine spiked at 17 held at 15. This time the traction control light came on then went off. (Don't get me wrong faster is nice, but think something may be wrong)

Continuing home I got on it a few times to see if it would boost faster again. It did & after a few times the TC stuck on till I got home.

Few things I was thinking it could be:
1. Change in weather - it has been warm in PA
2. I fill-up with WAWA gas b/c it is close to home, their gas now has 10% ethanol
3. Software problem

So yesterday and today it drive fine, no CEL but if I jump on it it will surge a bit when boosting and traction light will come on until I settle down. I may pull the DV and clean it too when I do the vag-scan.

Any other thoughts?

Car Profile if your interested: http://www.vwforum.com/forum/viewtopic.php?t=23034

[Raacerx]

like I have been taught by other PW members, no sense in asking the question until you pull the codes with VAG. There will be codes guaranteed. DV, N249 puck, N75, vacuum hoses, etc. I strongly doubt it is a software issue.

ps. my guess is vacuum hose or N75 valve

[lucas13dourado]

How long ago did u add the chip?

[ONE8T]

I'd guess coilpack. Vag-com should help identify which cylinder.

[Nesho]

Coilpack most likely. Had same problem before.Vag it, it will tel you whitch cyl.

[euroking83]

x2 i have a cel flashing and when i went to get it scan it was the coilpack

[db5.5]

Here is what came back:

Address 01: Engine Labels: 4B0-906-018.LBL
Part No SW: 4B0 906 018 DP HW: 8E0 909 018 A
Component: 1.8L R4/5VT G 0002
Coding: 0016701
Shop #: WSC 13365

4 Faults Found:
16487 - Mass Air Flow Sensor (G70): Signal too High
P0103 - 001 - Upper Limit Exceeded - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 008 - Implausible Signal - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - Upper Limit Exceeded - Intermittent
16687 - Cylinder 3: Misfire Detected
P0303 - 001 - Upper Limit Exceeded - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 4B0-614-517.LBL
Part No: 4B0 614 517 H
Component: ABS/ESP allrad 3428
Coding: 04275
Shop #: WSC 00028

1 Fault Found:
18265 - Load Signal: Error Message from ECU
P1857 - 35-10 - - - Intermittent

There was a misfire on 3, then random but with the other codes I'm not 100% convinced it's the packs, since there was a MAF & o2.

lucas13dourado - flash the second week I owned it, so 3 years ago

If it is the coil-pack I guess it is recommended to change them all? I may let it go this week to see if it happens again. Any other thoughts welcome.