Hydrocarbon content excessive?

roblloyd

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Your Mercedes
R129 1990 500SL
My r129 failed MOT on the hydrocarbon content excessive. What would make the car do This? Should be 0.132 but it was 1432. Did have the ma's module changed and found out they did not clear codes but I did this and car is not running right.
Anyone help.
Also anyone got got any pictures of the rear metal brake lines?
Thanks
Rob
 

Blobcat

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Grange Moor
Your Mercedes
R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
How often is it used?
If rarely then give it a really good run...(Italian tune up) and get them to test it again when it’s hot.
How old / dirty is the air filter and how old are the plugs?
 
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R

roblloyd

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Your Mercedes
R129 1990 500SL
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It's got new air filter and plugs are less than six months old. The car has not been drivern a lot. Only had 3000k since last MOT and that had no problems and the car has never had any problem like this. Will give it a good run and see how that goes. It was sitting around for a while.
Thanks
Rob
 

davidsl500

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Home : Derbyshire at the moment !
Your Mercedes
R172 250CDI Gone..!, R129 SL500 Gone...
if all else fails there was a wheeler dealer episode where Ed used the Terraclean system to get the HC down. I favour the italian tune-up first...
 
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roblloyd

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Your Mercedes
R129 1990 500SL
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Ended up being the plugs. GSF sold me the wrong plugs for the car. Always had hard time starting. Was told by another member take a plag out if it had a R on it change the plugs to F8DC4.
Did this and it passed & the car run much better.
 

ajlsl600

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france
Your Mercedes
clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
Have to admit, I don't think I would have spotted that. I guess Yr correct plug runs hotter.
 


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