« previous next »
Pages: [1] 2

Author Topic: Emissions fail  (Read 1876 times)

Offline Ludwig68

  • Just got here
  • *
  • Posts: 5
Emissions fail
« on: 18 June 2011, 17:33 »
Hi All

Got an issue with Mrs Ludwig's Mk3. Has failed MOT on emissions. So far garage has changed: plugs & leads, rotor arm & dizzy cap, Lamda switch. Compression test is all good (for a 130k engine) & there's no goo in the header tank. She runs fine but with a missfire between 2-3k revs. We've swapped the ECU from another car temporarily but the fault persists. fuel comsumption is terrible as it's running so rich. Any ideas?

Thanks
Logged

Offline Khare

  • Serious forum addict
  • *
  • Posts: 7,627
  • The bear that khares
Re: Emissions fail
« Reply #1 on: 18 June 2011, 17:39 »
maybe the cat is past it's expiry date?
Logged

Offline Seanl

  • I live here
  • *****
  • Posts: 2,561
Re: Emissions fail
« Reply #2 on: 18 June 2011, 21:00 »
MAF.  :wink:
Logged
Classic Green Corrado VR6 Storm | Jetex Cat back | BMC CDA | VT mounts | Bilstein B12 | 288mm front brakes | Mk4 rear brakes | Goodridge braided hoses | BBS RX228s | Shortshifter | Lupo wipers | Uprated headlight loom | All red rears | Refreshed leather | Fresh paint |

Offline Wayne

  • Sir Postalot
  • *
  • Posts: 32,051
Re: Emissions fail
« Reply #3 on: 18 June 2011, 21:10 »
Coolant temp sensor., try a new one.
Logged

Offline madmanmart

  • I live here
  • *****
  • Posts: 938
Re: Emissions fail
« Reply #4 on: 18 June 2011, 22:05 »
MAF is a good start...
Logged


Mk3 Golf 3dr GTI 16v
Mk3 Golf Cabriolet TD
20vt Corrado track car project

Offline lankylari

  • Not said much yet
  • **
  • Posts: 77
Re: Emissions fail
« Reply #5 on: 18 June 2011, 22:21 »
had simailer problem change MAF sensor cat as had collapsed inside the put in lap top to find idle sensor fault, so changed throttle body no plblems now just flow throw mot on emissons just rear axle mounts and welding. all the best.
Logged

Offline AudiA8Quattro

  • Forum addict
  • *
  • Posts: 4,776
Re: Emissions fail
« Reply #6 on: 18 June 2011, 22:27 »
I would run VAG com on it.
ECU coolant temp sender is a good place to start....
Logged
FOR DIY GUIDES GO TO <br>www.volkswagenaudi.co.uk<br/>BRAKES, SUSPENSION, CV JOINTS

Offline Ludwig68

  • Just got here
  • *
  • Posts: 5
Re: Emissions fail
« Reply #7 on: 19 June 2011, 11:56 »
Thanks guys. Looks like MAF sensor change first. Er... where is it & does it matter if it's a 16v engine?

Ta
Logged

Offline madmanmart

  • I live here
  • *****
  • Posts: 938
Re: Emissions fail
« Reply #8 on: 19 June 2011, 13:30 »
Quote from: Ludwig68 on 19 June 2011, 11:56
Thanks guys. Looks like MAF sensor change first. Er... where is it & does it matter if it's a 16v engine?

Ta

Yes it does matter, the 16v does not have a MAF sensor.

Is the car a 8v or 16v?
Logged


Mk3 Golf 3dr GTI 16v
Mk3 Golf Cabriolet TD
20vt Corrado track car project

Offline simc66

  • Not said much yet
  • **
  • Posts: 85
Re: Emissions fail
« Reply #9 on: 19 June 2011, 16:11 »
Misfire between 2-3k (and crap fuel consumption) on my 16v was a perished fuel pressure regulator hose.
Logged
1997 Mk3 Colour Concept, 2006 Polo GTI, 1987 Type 25
Pages: [1] 2
« previous next »