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Join Date: Sep 2005
Location: Southern California
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93 toyota pickup -- failed smog in CA
I got a 1993 Toyota Pickup, approximately 200K miles. I failed a smog test here in California. Barely passed the 15 MPH test, but failed on the 25 MPH test. The smog guy told me that my CAT is good, but that the truck needs a tune-up. I replaced CAP, ROTOR, and Spark Plugs with Toyota parts. Connecting T and E1 on the data connector, I timed the truck to 5 Deg , and the idle is set at 750. I checked the compression, getting 165, 165, 165, 163 with 163 on cylinder #4.
15 mph 2736 RPM %CO2 (13.0) %O2 (2.2) HC (95)(Max 95) CO% (.53) (Max .53) NO (164) (Max 552) PASSED
25 mph 2636 RPM %CO2 (13.0) %O2 (2.2) HC (88)(Max 60) CO% (.38) (Max .63) NO (159) (Max 805) FAILED
At 15 mph I barely passed, but on the 25 mph I failed high HC and moderate CO.
I'm thinking that I'm getting too much fuel, maybe my cold start is stuck or I have injector issues, too much fuel.