'92 SC300 Emission test fail
08-11-06, 10:30 AM
#1
Driver School Candidate
Thread Starter
'92 SC300 Emission test fail
I just bought a '92 SC300 w/ 194k. It passed safety test ok, but fails on the Missouri Emissions Test. I have changed the oil, plugs(Denso Double Plat) and ignition wires. Runs smooth with no CEL.
Any ideas before shelling out the money for engine emissions diagnosis?
Any ideas before shelling out the money for engine emissions diagnosis?
08-11-06, 10:45 AM
#2
Super Moderator
You can have no CELs and there can still be a problem that your ECM cannot uncover from your your cats or O2 sensors.
One thing I do with my uncle´s cars down here is evaluate the emissions test findings over the years (you can bribe to pass down here if necessary) and I usually find that even when we do some of the things you did, very little decrease.
A lot of times there is buildup in certain parts of the motor (not ncessarily that the cat is plugged) or even on the O2 sensors, but not enough to trip up a CEL. The wavelength detected after the cat by an O2 sensor may show normal, but actually there is buildup in the engine that does not make for the best combustion gets detected within an emissions test.
Cleaning IACV, EGR Vavles, intake, throttle body, an engine flush with new oil and filter, using techron fuel additive...are just a few of the things we do down here and I know some other CL members do, too. I am sure others have their favorite methods.
One thing I do with my uncle´s cars down here is evaluate the emissions test findings over the years (you can bribe to pass down here if necessary) and I usually find that even when we do some of the things you did, very little decrease.
A lot of times there is buildup in certain parts of the motor (not ncessarily that the cat is plugged) or even on the O2 sensors, but not enough to trip up a CEL. The wavelength detected after the cat by an O2 sensor may show normal, but actually there is buildup in the engine that does not make for the best combustion gets detected within an emissions test.
Cleaning IACV, EGR Vavles, intake, throttle body, an engine flush with new oil and filter, using techron fuel additive...are just a few of the things we do down here and I know some other CL members do, too. I am sure others have their favorite methods.
Thread
Thread Starter
Forum
Replies
Last Post
miraluna
Performance & Maintenance
6
03-12-13 08:31 PM
sc3boost
Performance & Maintenance
7
10-22-04 04:41 PM
