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What causes high hydrocarbons 200 1985

posted by  newmex999 on  Sat Oct 12 14:59 CST 2013
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last visit: Thu Aug 21 09:05 CST 2014
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My 85 240 had high hydrocarbons on the emissions test. What can I do to lower the levels?

Thanks
--
1993 240, 1992 240GL, 1985 240DL Wagon, 1983 240DL








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Low Compression 200 1985

uid 40935's pic
posted by  Goatman on  Sun Oct 13 09:55 CST 2013
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last visit: Sat Jul 26 20:30 CST 2014
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Low compression will result in the fuel not being completely burnt. Engine wear results in low compression.








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What causes high hydrocarbons 200 1985

posted by  Peetz on  Sat Oct 12 20:59 CST 2013
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last visit: Thu Oct 9 10:18 CST 2014
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Rich produces CO. To get high HC usually takes a misfire and that can be lean, or rich. If rich then you'll see high CO too. The O2 sensor will confuse things by compensating the other cylinders so it's a bit of a deal to diagnose.
Spark plugs or a blown intake manifold gasket would be things to look for especially if the idle quality is bad.








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What causes high hydrocarbons 200 1985

posted by  james_a_sousa on  Sat Oct 12 17:26 CST 2013
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last visit: Thu Oct 23 18:51 CST 2014
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Some causes -

Burning oil - how much oil do you have to add per 1000 miles?

Clogged air filter

Car needs a tune up

Oxygen sensor problem

Bad fuel injectors

Clogged engine breather system - flame arrestor, vacuum hoses, etc,

Problem with charcoal canister system.

Bad temp sensor

Engine not fully warmed up - did you take the car for a good drive before testing?

Etc,etc...








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What causes high hydrocarbons 200 1985

posted by  newmex999 on  Sat Oct 12 20:38 CST 2013
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last visit: Thu Aug 21 09:05 CST 2014
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Wow, so I guess just about everything.

Car was warmed up thoroughly, air filter changed, don't burn oil, just leak it!
--
1993 240, 1992 240GL, 1985 240DL Wagon, 1983 240DL







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