Boost level fluctuating? GIAC chip.
05-13-2007, 05:59 AM
#1
New Member
Thread Starter
Join Date: Feb 2004
Posts: 24
Likes: 0
Received 0 Likes
on
0 Posts
Boost level fluctuating? GIAC chip.
Got a GIAC chipped 2000 1.8tqm, ATW I think?
Haven't been around these parts in a long time, but I have sort of an issue that I'm lost on. Occasionally, my boost level fluctuates, but not like a leak--it seems like it's reverting back to OEM levels.
From a 17-18psi normal peak level it reverts to a steady 7-8psi peak boost (and you can feel the lack of power). It's really weird because on a single 10-15 mile trip it will fluctuate up to maybe 2 or 3 times (boosting fine, then boosting at OEM level). A/C off.. turn the engine off and on, doesn't make a difference.
I have NO idea's here, is it a problem with the chip? If anyone can point me in the right direction I'd appreciate it.
Haven't been around these parts in a long time, but I have sort of an issue that I'm lost on. Occasionally, my boost level fluctuates, but not like a leak--it seems like it's reverting back to OEM levels.
From a 17-18psi normal peak level it reverts to a steady 7-8psi peak boost (and you can feel the lack of power). It's really weird because on a single 10-15 mile trip it will fluctuate up to maybe 2 or 3 times (boosting fine, then boosting at OEM level). A/C off.. turn the engine off and on, doesn't make a difference.
I have NO idea's here, is it a problem with the chip? If anyone can point me in the right direction I'd appreciate it.
05-13-2007, 06:03 AM
#3
Mr Mc Feely
Join Date: Feb 2003
Posts: 17,459
Likes: 0
Received 0 Likes
on
0 Posts
Your N75 is shot
inspect all vac lines. Just had a buddy with the same symptoms as you are describing. new N75 cured all.
Either get an N75 valve or a manual boost controller.
Cheers,
Joel
Either get an N75 valve or a manual boost controller.
Cheers,
Joel
05-13-2007, 06:14 AM
#4
New Member
Thread Starter
Join Date: Feb 2004
Posts: 24
Likes: 0
Received 0 Likes
on
0 Posts
Re: N75 valve or MAF sensor. You may have a vac line leak at the N75. Any check engine light, ever?
Thanks for the quick responses! Actually I did forget to mention, it's been happening for a few weeks but only in the last week the CE light's come on a couple times.
Weird--my buddy was talking about the wastegate but said it wouldn't fluctuate between the same levels when it was working properly or not. Hmmm.. weird. I'll take a look at that.
Weird--my buddy was talking about the wastegate but said it wouldn't fluctuate between the same levels when it was working properly or not. Hmmm.. weird. I'll take a look at that.
Thought about that right after I made my first post. I'll report back. Trending Topics
05-13-2007, 07:47 AM
#8
New Member
Thread Starter
Join Date: Feb 2004
Posts: 24
Likes: 0
Received 0 Likes
on
0 Posts
VAG-COM report
Address 01: Engine Labels: 4B0-906-018.LBL
Part No: 4B0 906 018 P
Component: 1.8L R4/5VT G01 0006
Coding: 07201
Shop #: WSC 24110
3 Faults Found:
17536 - Fuel Trim; Bank 1 (Mult): System too Lean
P1128 - 35-10 - - - Intermittent
17521 - Oxygen (Lambda) Sensor; B1 S1: Internal Resistance too High
P1113 - 35-10 - - - Intermittent
16524 - Oxygen (Lambda) Sensor B1 S2: No Activity
P0140 - 35-10 - - - Intermittent
Readiness: 0000 0000
Part No: 4B0 906 018 P
Component: 1.8L R4/5VT G01 0006
Coding: 07201
Shop #: WSC 24110
3 Faults Found:
17536 - Fuel Trim; Bank 1 (Mult): System too Lean
P1128 - 35-10 - - - Intermittent
17521 - Oxygen (Lambda) Sensor; B1 S1: Internal Resistance too High
P1113 - 35-10 - - - Intermittent
16524 - Oxygen (Lambda) Sensor B1 S2: No Activity
P0140 - 35-10 - - - Intermittent
Readiness: 0000 0000
05-13-2007, 08:24 AM
#9
I had similar problem. if i was accelerating slowly would reach 5 psi, then if floored it would not
go any higher than 5 PSI, if I let off it (so boost dropped back down) and then floored it i'd get normal boost levels. It was just the N75 acting stupid, (and I had N75 intermittent signal code) replaced N75 and car has been running better. Wouldnt he have a CEL code though if it was N75 malfunctioning?
