MOT failure assistance

sol-lude · Post by **sol-lude** » Sat Jun 09, 2018 9:48 pm

So the BB4 went in for MOT a couple of split boots. Rear ARB link. Arches. Lambda was at 1.284 limit should be 1.030. Now there is a crack in the exhaust at the joint of the back box so will get a weld on that and it should sort the lambda. CO2 was at 0.70 limit should be 0.20. MOTr said its like my cat isn't even there.

Now I have just done the down pipe and on visual inspection of the cat at one end all seemed well from that.

Question is do I now take this off and replace with one off ebay if so where can I get the heat sensor that sits in the cat
Or do I chance the spare one I have and see if that will pass? Again issue with the heat sensor on that as I just cut it off when removing.

Thanks in advance.

firstlude · Post by **firstlude** » Sat Jun 09, 2018 10:07 pm

seems your having the fun i had with emissions at mot , mine was sorted by fitting new air filter new plugs cleaned egr valve and replaced downpipe as mine was cracked , not sure about your cat issue i guess as a starting point have a look to see if there are any insides left ........

Post by **newkid** » Sat Jun 09, 2018 11:01 pm

http://www.ludegeneration.co.uk/wiki/in ... sions_Test

Doesn't need a cat being a bb4 so they can run the test as a non cat.

sol-lude · Post by **sol-lude** » Sun Jun 10, 2018 8:36 am

I have a bit of an issue with the dating. If it had been 95 I would have been fine but this is causing me an issue

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Post by **vanzep** » Sun Jun 10, 2018 1:07 pm

Ive had a quick look at exhaust gas test results from previous MOT's
BB4 no cat plm tri-y 2.5" pipe
(smokey and overfuels)
CO 0.40 to 0.60%
HC 135-221ppm

I would think about changing your 02 sensor, checking your dizzy timing ,plugs and leads

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Jun 10, 2018 2:57 pm

You don't need the heat sensor in the cat, so don't worry about that. Just earth off the wire to stop the light coming on.

Post by **vanzep** » Tue Jun 12, 2018 1:51 pm

how you getting on with the MOT

i have a spare jdm cat with sensor if you want a loan of it - also got a few O2 sensors

sol-lude · Post by **sol-lude** » Wed Jun 13, 2018 7:19 am

vanzep wrote:how you getting on with the MOT

i have a spare jdm cat with sensor if you want a loan of it - also got a few O2 sensors

I'm gonna phone today and see if I can't get it through as a 95 mate I'll just say all Bb4s were 95 and I was wrong.

sol-lude · Post by **sol-lude** » Sat Jun 23, 2018 12:53 pm

So with a new cat, weld on split exhaust duct tape over the arches she has passed. Oh and had to turn the dizzy a bit as she was still running rich. Although had to turn dizzy back again as didn't run right after leaving mot station.

firstlude · Post by **firstlude** » Sat Jun 23, 2018 1:36 pm

always a good feeling when it gets a fresh mot well done that man

Lude Generation

MOT failure assistance

MOT failure assistance

Re: MOT failure assistance