www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You




Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

Reply
 
Thread Tools
Old January 12th, 2018, 16:03   #1
Beerbaron666
Newbie
 
Join Date: Dec 2017
Location: Vancouver bc
TDI(s): 2005 jetta
Thumbs down MAF Troubles

I'm starting to think my car is cursed lol ok I'll see if I can explain with going on to long. About a year ago I got the old p0101 code and just assumed it was the MAF so I changed but still couldn't get rid of the code. Fast forward to a month ago I had a feeling about the MAF that maybe it was the wrong one , sure enough it was for a gas engine ( I know I should have checked before I installed it) so I swapped my old one in and the car ran better for a about two weeks then it was all down hill from there. I'm guessing the MAF gave up the ghost and put the car in limp mode so I unplugged it and the car runs fine not as much power but runs at least. So I bought a new one (the right one this time) put it in and the car runs like crap with no bottom end power, I checked to flow rate and it was at 220mg/St so I thought maybe it was screwed and exchanged it and the same thing. With the MAF unplugged it's at 550 but never changes , with the one from the gas engine it idles around 530 and goes up as it should but I'm guessing not as high as it should. Does anyone have any idea why the wrong MAF works and the right one doesn't?
Beerbaron666 is offline   Reply With Quote
Old January 12th, 2018, 20:24   #2
UhOh
Veteran Member
 
UhOh's Avatar
 
Join Date: Dec 2014
Location: PNW
Default

Where are these new MAFs coming from, what brand?

I'd look to clean the harness connector and dab with a bit of dialectic grease.

It is possible that you have a bad wire in that harness.
UhOh is offline   Reply With Quote
Old January 13th, 2018, 05:08   #3
JB05
Veteran Member
 
Join Date: Oct 2005
Location: Il.USA
Fuel Economy: 43/41/40
Default

Did you check all boost hose connections? I had this P0101 code also, and it turned out to be the small hose on the bottom of the inter cooler; the hose became uncoupled due to worn barbs/nubs.
JB05 is online now   Reply With Quote
Old January 13th, 2018, 08:20   #4
Beerbaron666
Newbie
 
Join Date: Dec 2017
Location: Vancouver bc
TDI(s): 2005 jetta
Default

I can't remember what brand the new MAF is but it's not a Bosch but it's not a $10 out of China one either. Im going to have to test the connections I guess I just figured since the "gasser one" worked ok the connections were ok but I'm going to check them anyways. I do have a boost leak on the lower hose at the intercooler nothing crazy but I do need to fix it. My original MAF (which puts the car in limp mode) is a Bosch same with the Gasser one.
Beerbaron666 is offline   Reply With Quote
Old January 13th, 2018, 14:12   #5
BobnOH
not-a-mechanic
 
Join Date: May 2004
Location: central Ohio
Fuel Economy: 50/45/35
Default

MAF may be fine, you can't just replace part named in code.
Try this- from the Ross Tech wiki
BobnOH is online now   Reply With Quote
Old January 13th, 2018, 21:04   #6
UhOh
Veteran Member
 
UhOh's Avatar
 
Join Date: Dec 2014
Location: PNW
Default

Quote:
Originally Posted by Beerbaron666 View Post
I can't remember what brand the new MAF is but it's not a Bosch but it's not a $10 out of China one either. Im going to have to test the connections I guess I just figured since the "gasser one" worked ok the connections were ok but I'm going to check them anyways. I do have a boost leak on the lower hose at the intercooler nothing crazy but I do need to fix it. My original MAF (which puts the car in limp mode) is a Bosch same with the Gasser one.
You're changing the things that are being connected. While one can assume they ought connect up the same it is not a certainty. This is electrical stuff. AND, if it's not a Bosch replacement then there's less certainty.

As critical as MAFs are I cannot fathom how people can think that it's OK to scrimp on them. I replaced one on the wife's car at over 150k miles (and 16 years). A $100 part. One on my car has about 166k miles and I'm thinking that it's just getting a little tired- again, $100 and no more head-scratching (for perhaps another 150k+ miles).
UhOh is offline   Reply With Quote
Old January 13th, 2018, 21:27   #7
Vince Waldon
Veteran Member
 
Vince Waldon's Avatar
 
Join Date: Apr 2009
Location: Edmonton Alberta Canada
Default

Another possibility: an EGR valve that's sticking open a bit can cause "MAF signal too high" code.

Easy to check: pull the EGR valve, plug it back in to the electrical connector while it's lying on top of the valve cover, and then run the "exercise the MAF" test using VCDS.

BTDT, got the MAF we didn't need to buy to prove it.
__________________
Vince Waldon Edmonton AB Canada

Note: The above is to the best of my knowledge- but at the end of the day simply interweb opinion, worth EXACTLY what you paid for it, and if used done so at your own risk.
Vince Waldon is online now   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
A/C troubles cline568 TDI 101 1 August 10th, 2013 13:49
needd your thoughts about MAF troubles newbeetleman TDI 101 15 February 26th, 2008 17:09
Troubles and more Troubles VA Jetta TDI 101 3 January 24th, 2007 16:13
MAF troubles? No power, no CEL JimmyK TDI 101 6 November 2nd, 2006 09:32
Troubles-MAF/Turbo drjtdi VW MKIV-A4 TDIs (VE and PD) 1 December 19th, 2003 13:18


All times are GMT -7. The time now is 09:38.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.14058 seconds with 12 queries
[Output: 81.81 Kb. compressed to 71.26 Kb. by saving 10.55 Kb. (12.89%)]