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Author Topic: Emissions MOT failure Please help  (Read 964 times)

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downsmen

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Emissions MOT failure Please help
« on: 23 September 2009, 17:59:59 »

Hi just took car back for a re test, and it still failed on emmisions.

I have just done a paper clip test and come up with the following.

Any ideas Please

0115 Engine Coolant Temperature Sensor
0403 EGR Valve
0110 Intake air Temperature
0100 Mass air flow Sensor

It was only failing on Co levels they are about double off what they should be.

Paul
« Last Edit: 23 September 2009, 18:42:38 by Downsmen »
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rustym95

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Re: Emissions MOT failure Please help
« Reply #1 on: 23 September 2009, 21:45:46 »

looks to me u have a lose connection to the ECU, as I have mad a wiring deagram of my own and there are a lot of wiresn that link together before going into the ECU, Take the bat of and check the connections on the ECU just be shore. :y :y :y
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Omegatoy

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Re: Emissions MOT failure Please help
« Reply #2 on: 24 September 2009, 09:04:23 »

change the cts and clear the codes and it will prob be fine looks like all the problems stem from coolant temp sensor being faulty cold be a corroded connection on it i suppose but would think new one would be best bet :y

downsmen

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Re: Emissions MOT failure Please help
« Reply #3 on: 24 September 2009, 09:20:28 »

Great at least i know where to start, any ideas how i can get to it without taking the engine apart, as i have the 2.0 engine and cant even see the thing
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Abiton

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Re: Emissions MOT failure Please help
« Reply #4 on: 24 September 2009, 10:17:58 »

It's awkward to reach, but if you take the HT leads off the DIS-pack it gets easier.  Label leads and DIS positions before disconnecting though, save yourself trouble later.  Can be located by feel, two-pin "junior timer" type connector, between and below DIS and EGR valve, nearer DIS.

I put a pic on here a couple of weeks back of the sender in question, in position, I'll have a look for it at lunchtime if you can't locate it.
Edit: Here you go:

As rusty says below, access is easier from below, if you have the facilities, and the long arms; as you'll be able to see what you're at.

 :)

Pete
« Last Edit: 24 September 2009, 12:20:32 by Abiton »
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rustym95

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Re: Emissions MOT failure Please help
« Reply #5 on: 24 September 2009, 10:41:11 »

from underneath the car put it on ramps, need long arms lol :y :y
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downsmen

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Re: Emissions MOT failure Please help
« Reply #6 on: 24 September 2009, 13:16:13 »

Thanks for the picture at least i know what im trying to feel for, just ordered a new one that will be here tomorrow, so i'll shall fit that and let you know what happens.
Also how do you clear the Error Codes?

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downsmen

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Re: Emissions MOT failure Please help
« Reply #7 on: 25 September 2009, 21:18:59 »

just finished putting the new sensor on, whilst doing this i noticed that the plugs for the EGr and CTS where on the wrong way round.

I swapped these over and now the engine management light has gone out. :)
Would this have been the cause of the emissions also would it have caused anymore damage to anything else.
just checked for error codes and its still showing the same codes, so im confused is it fixed now. :-?

Taking it back for retest in the morning so fingers crossed :y
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Andy B

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Re: Emissions MOT failure Please help
« Reply #8 on: 25 September 2009, 21:43:40 »

Quote
just finished putting the new sensor on, whilst doing this i noticed that the plugs for the EGr and CTS where on the wrong way round.

I swapped these over and now the engine management light has gone out. :)
Would this have been the cause of the emissions also would it have caused anymore damage to anything else.
just checked for error codes and its still showing the same codes, so im confused is it fixed now. :-?

Taking it back for retest in the morning so fingers crossed :y

If tyhe EML is now out, then you've sorted it & the car is happy. The codes will stay in the ECU till you've done 20 'clean' starts or you get them cleared with a code reader.

Pass on the emmisions though.  :-?
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downsmen

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Re: Emissions MOT failure Please help
« Reply #9 on: 25 September 2009, 21:53:23 »

Thanks for your help, i will let you know how it gets on tomorrow
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downsmen

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Re: Emissions MOT failure Please help
« Reply #10 on: 26 September 2009, 13:08:00 »

Well just got back from test centre and it has still failed on the emissions. :(

having replaced the coolant temp sensor has helped abit by bringing it down but not enough. :'( :'(

What else can i do?
What does the EGR do? would it help if i replaced it.
There is a donor engine at the local srappy so was thinking about taking the top section of the inlet manifold off and replacing that, or would that be a waste of time.
Also would the mass air intake sensor cause the problem.

When on tick over the emissions are fine but when you run at 2500-3000 the CO levels the readings race away.

really getting confused now!!!!!

any ideas?
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RobG

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Re: Emissions MOT failure Please help
« Reply #11 on: 26 September 2009, 13:28:52 »


The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of exhaust gas back into the intake manifold. This gas mixes with the intake air and  cools the combustion process. The gas that the EGR valve recirculates also prevents the formation of nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. If the EGR valve gets stuck open or shut this causes NOX gases to build up.  :y
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downsmen

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Re: Emissions MOT failure Please help
« Reply #12 on: 26 September 2009, 13:31:33 »

how do you know if its not working correctly?
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