Other symptoms: High idle has been a problem for a long time & ''service engine soon'' light has been coming on intermittantly for quite awhile (months). Have changed oil & filter, o2 sensor, egr valve, throttle position sensor, cat converter, air filter, checked & fixed vacuum lines (this allowed me to clear error codes 32 & 44). While doing this work over a few weeks, engine rpm began surging except when under acceleration. Had diagnostic test done 2 days ago, which revealed the driver side fuel injector was bad. Replaced the injector, which cured the surging, but the ''service engine soon'' light still comes on, and there is still a high idle. When I got the truck after the test, the service manager said I might have a vacuum leak at the TBI base plate gasket. I have not had time to check this. Any input is welcome. Thank you...
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i have a 90 chevy 2500 2wd 350ci.when i go to start my truck the key turns hard in the ignition,the check engine light and brake light come on the heater dont work,and the transmission will shift from 1-2 at real high rpm and shift hard,no 3-od.this comes and goes,but all happens at the same time.some times it last for 10 min,sometimes its days.what is going on?
Have your temperature sending unit checked to be sure the computer is taking it out of cold start mode. Most likely it is not working and still dumping too much fuel into the engine and causing the high reading. Think about what I just said, makes sense doesn't it.
P0496 is not alisted code.
P0455 - Evaporative Emission Control System Leak Detected Gross Leak (fuel vapors)
- Engine Light ON (or Service Engine Soon Warning Light) - Possible a noticeable fuel odor caused by the release of fuel vapors
- Missing or loose fuel cap - Incorrect fuel filler cap used - Fuel filler cap remains open or fails to close - Foreign matter caught in fuel filler cap - EVAP canister or fuel tank leaks - EVAP system hose leaking - Fuel tank leaking