what causes high Hyrdo Carbons??
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Joined: Jun 2001
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From: Bedford, Tx
what causes high Hyrdo Carbons??
im having readings of 984 PPM at low idle. (900 rpms)
and 148PPM at high idle. (2000 rpms)
what is the cause of this? EGR or the cat or somethign else?
and 148PPM at high idle. (2000 rpms)
what is the cause of this? EGR or the cat or somethign else?
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Joined: Jul 2000
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
hydrocarbons is incomplete combustion
EGR really has nothing to do with this
EGR is used to regulate oxides of nitrogen (NOx)
the catylitic converter.....partly
EGR really has nothing to do with this
EGR is used to regulate oxides of nitrogen (NOx)
the catylitic converter.....partly
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Joined: Apr 2002
Posts: 1,353
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From: Austin
Car: 82 Z-28
Engine: 383 TPI
Transmission: 700R4
A vacuum leak making one cyl "miss" intermittently at idle.
Unburned fuel from a "miss" can make HC levels be high.
A small vacuum leak would not be noticeable at higher rpms.
Leaking\dirty fuel injector(s) would make idle too rich.
Unburned fuel from a "miss" can make HC levels be high.
A small vacuum leak would not be noticeable at higher rpms.
Leaking\dirty fuel injector(s) would make idle too rich.
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