Discussion
Hi All
i have just picked my TVR up from the garage where it has failed it's MOT on the emissions!
he is not a TVR garage and he says he knows little about them! he said he thought it may be the cat but was unsure!
he said the readings were high!!
has anyone any idea where to start!
the readings are:
Fast idle test
CO 0.30 4.63(%vol) Fail
HC 200 111 (ppm vol) Pass
Strange sign that i dont have on the computer its like a fancy upsidedown y
0.97 -1.03 0.872 Fail
2nd fast idle test
CO 0.30 4.55 (%vol) Fail
HC 200 108 (ppm vol) Pass
funny sign again
0.97 - 1.03 0.872 Fail
Natural Idle Test
CO 0.50 2.93 (%vol) Fail
hope someone can help
Regards
Andy
i have just picked my TVR up from the garage where it has failed it's MOT on the emissions!
he is not a TVR garage and he says he knows little about them! he said he thought it may be the cat but was unsure!
he said the readings were high!!
has anyone any idea where to start!
the readings are:
Fast idle test
CO 0.30 4.63(%vol) Fail
HC 200 111 (ppm vol) Pass
Strange sign that i dont have on the computer its like a fancy upsidedown y
0.97 -1.03 0.872 Fail
2nd fast idle test
CO 0.30 4.55 (%vol) Fail
HC 200 108 (ppm vol) Pass
funny sign again
0.97 - 1.03 0.872 Fail
Natural Idle Test
CO 0.50 2.93 (%vol) Fail
hope someone can help
Regards
Andy
Not an expert at all and no doubt one will be along soon. However as the Hydrocarbon levels seem good I would think the engine is running cleanly and firing on all cylinders OK, which suggests the basics of plugs, leads, cam etc are good. The high CO (Carbon Monoxide) level suggests to me that it is simply running far too rich. In my experience I would start looking around the airflow meter, if this is telling the ECU that more air is passing than is the case it will throw in too much fuel. Another point to check is the ECU temperature sender (usually separate to the temp gauge) as if this is reporting that the engine is not up to temperature it will still be using the warm up part of the map.
Unless you can see an obvious lead hanging off (last time mine was running very rich it was indeed simply a broken wire at the air flow meter plug) or have access to a gas analyser then really you will probably have to take it to someone who has.
Just a thought, is the car new to you or have you taken it for MOT before ?
Unless you can see an obvious lead hanging off (last time mine was running very rich it was indeed simply a broken wire at the air flow meter plug) or have access to a gas analyser then really you will probably have to take it to someone who has.
Just a thought, is the car new to you or have you taken it for MOT before ?
The symbol you are refering to is for the Lambda sensor or, as it is also known, the oxygen sensor. Your engine has one sensor fitted in each exhaust manifold. If the Lambda sensors are sending incorrect information to the ECU the fuel mixture will go to rich.
As the hydrocarbon (HCppm) is low this would indicate that the engine is burning the fuel correctly.
You can try removing & cleaning the Lambda sensors but in most instances it is an internal fault in the sensor. These sensors are available from most motor factors but if you do need to change them make sure your get the type with the connector block as there are some makes that come with just bare wires which you then have to cut & solder in...a real pain
Bodders
As the hydrocarbon (HCppm) is low this would indicate that the engine is burning the fuel correctly.
You can try removing & cleaning the Lambda sensors but in most instances it is an internal fault in the sensor. These sensors are available from most motor factors but if you do need to change them make sure your get the type with the connector block as there are some makes that come with just bare wires which you then have to cut & solder in...a real pain
Bodders
Andychim400 said:
Lamda readings almost exactly the same as mine were on the quoted post.
On mine only one Lamda sensor was shot, and once replaced it sailed though.
Cheers
Andy
And if this is the case the one working will be a brown/greyish color the failed one will be black,this is only a rough guide but a good indicator get them checked with a tester/volt meter 1st.If you want to borrow the socket to remove them let me know On mine only one Lamda sensor was shot, and once replaced it sailed though.
Cheers
Andy
Edited by That Daddy on Tuesday 5th August 16:03
hi guys
Thanks for the quick replys.
i will have a look tommorrow at the sensors and see what they are like. the problem is checking it afterwards! is there any way to check them or is it just look at the colour of them and go from there?
i have had the car for a few years now and i took it to the same garage last year and it passed no problem, i have only done 2k in the last year!! (I know i should be ashamed!!)
Andy
Thanks for the quick replys.
i will have a look tommorrow at the sensors and see what they are like. the problem is checking it afterwards! is there any way to check them or is it just look at the colour of them and go from there?
i have had the car for a few years now and i took it to the same garage last year and it passed no problem, i have only done 2k in the last year!! (I know i should be ashamed!!)
Andy
That Daddy said:
Andychim400 said:
Lamda readings almost exactly the same as mine were on the quoted post.
On mine only one Lamda sensor was shot, and once replaced it sailed though.
Cheers
Andy
And if this is the case the one working will be a brown/greyish color the failed one will be black,this is only a rough guide but a good indicator get them checked with a tester/volt meter 1st.If you want to borrow the socket to remove them let me know On mine only one Lamda sensor was shot, and once replaced it sailed though.
Cheers
Andy
Edited by That Daddy on Tuesday 5th August 16:03
and plugs on one bank of cylinders will be black/rich,remember 1 Lambda probe does one bank of 4 cylinders and the 2nd Lambda probe does the other bank of 4 cylinders.hi guys
the car was cold when they did the MOT i had to leave it there over night!
i ordered a new lambda yesterday which arrived today (very quick service)
having adapted a 17mm socket and taking the car for a run this morning i took out the lambda's!
what do you all think?
<a href="http://s46.photobucket.com/albums/f129/andy1611/?action=view¤t=PICT0320.jpg" target="_blank"><img src="http://i46.photobucket.com/albums/f129/andy1611/PICT0320.jpg" border="0" alt="passenger lambda"></a>
<a href="http://s46.photobucket.com/albums/f129/andy1611/?action=view¤t=PICT0321.jpg" target="_blank"><img src="http://i46.photobucket.com/albums/f129/andy1611/PICT0321.jpg" border="0" alt="drivers lambda"></a>
Any comments welcome!
Andy
the car was cold when they did the MOT i had to leave it there over night!
i ordered a new lambda yesterday which arrived today (very quick service)
having adapted a 17mm socket and taking the car for a run this morning i took out the lambda's!
what do you all think?
<a href="http://s46.photobucket.com/albums/f129/andy1611/?action=view¤t=PICT0320.jpg" target="_blank"><img src="http://i46.photobucket.com/albums/f129/andy1611/PICT0320.jpg" border="0" alt="passenger lambda"></a>
<a href="http://s46.photobucket.com/albums/f129/andy1611/?action=view¤t=PICT0321.jpg" target="_blank"><img src="http://i46.photobucket.com/albums/f129/andy1611/PICT0321.jpg" border="0" alt="drivers lambda"></a>
Any comments welcome!
Andy
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