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VW Fox 1.0 2006 - Failed emissions, cat glowing red #

Posted by John Fletcher on April 24, 2012, 12:25 pm

Year of Manufacture *: 2006
Engine Size and Code *: 1198

Hi

Vehicle failed emissions test, when checking we noticed the manifold cat glowing red. We checked for air leaks/fuel pressure and injector pattern all were OK. The tick over is OK and I have spoke to a mechanic at TPS who tells me that this engine doesn't have a timing issue. We replaced the cat and sensor and re-tested passed the emissions test, but the cat is still glowing any help on this will be much appreciated cheers

John

Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED

Posted by aidan birley <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2879' width='330' height='300' border=0 style='border:none;'> on April 24, 2012, 1:49 pm, in reply to "V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED"
Aidan Birley

John

please give more info i.e ALL 5 gas readings before and after cat replaced, fault codes, live data etc.

weak running, misfire & restricted exhaust can all increase exhaust temperature.

cheers Aidan

Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED

Posted by john fletcher <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5112' width='330' height='300' border=0 style='border:none;'> on April 24, 2012, 2:55 pm, in reply to "V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED"
John Fletcher

Hi Aidan
I can only give you emissions after new cat the readings with the old cat were that bad we abandoned the test CO 0.014 CO2 15.21 HC 2 O2 0.03 LAMBDA 1.001 there was a fault code PO420 relating to cat efficiency there is no misfire and the car runs well I cant give you live readings as I am unable to print off my scope cheers john

Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED

Posted by aidan birley <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2879' width='330' height='300' border=0 style='border:none;'> on April 25, 2012, 6:35 pm, in reply to "Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED"
Aidan Birley

John

Those readings look OK to me,

The first set of readings would have been more help,especially if they where that bad !

Slightly Odd a the cat has only limited ability to clean up poor emissions.

is this a close coupled or remote cat ?

One thing for sure is that the fault is the cause of the first cat failing.

By live data I meant from scanner in the first instance.

cheers aidan

Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED

Posted by John Fletcher <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5112' width='330' height='300' border=0 style='border:none;'> on April 26, 2012, 8:24 am, in reply to "Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED"
John Fletcher

Aidan
the cat is part of the manifold ,the original oxy sensor had burnt out so that was also causing high emissions I think by the lack of posts that we are not the only ones who are baffled by this one John

Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED

Posted by david cogan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5506' width='330' height='300' border=0 style='border:none;'> on April 28, 2012, 10:12 pm, in reply to "Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED"
David Cogan

hi john,see what the vacume readings are Dave cogan

Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED

Posted by John Kennard <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5582' width='330' height='300' border=0 style='border:none;'> on May 2, 2012, 1:47 pm, in reply to "Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED"
John Kennard

Hi John, you mention that you don’t have a misfire, but go and look at timing data, if your tool allows you to do so. I feel this is a coil problem and the timing is retarded by the ECU although you don’t have a misfire or codes for a misfire, every situation like this we have had has been cured by new ign. coils, for some reason the software engineers haven’t written codes for this situation. I posted on this situation a while back with very similar problems.
John Kennard.

Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED

Posted by john fletcher <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5112' width='330' height='300' border=0 style='border:none;'> on May 4, 2012, 7:16 pm, in reply to "Re: V/W FOX EXHAUST MANIFOLD/CAT GLOWING RED"
John Fletcher

hi guys thanks for the responce i have been away the customer is going to decide when i get back in work if she wants me to have another look at it, from what i can remember David the vac readings were ok i agree with John about it being retarded but never even looked at coils will let you know if if comes back

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