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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No, a bad idle control valve will not cause a "no start" scenario. See below:
"An IAV sometimes may fail, or can become troublesome. This can manifest itself through various problems while driving. Following are a few problems that may be caused by a faulty IAV.
A rough running engine can be caused by a faulty IAV. If the valve begins to stick over time, or fails to respond to inputs from the car's computer, it may not properly adjust for engine loads and operating temperatures. If you notice that your car seems to run rough when it starts up, or once it warms up, it may be a good idea to check the IAV.
Sometimes you may notice that your car stalls at a stoplight or anytime you come to a stop. An IAV that isn't working correctly can cause that to happen because the engine's computer can no longer keep the engine idling. Many other things can cause stalls, so be sure to investigate other possibilities, such as bad spark plugs.
A failing IAV may cause the check engine light or service engine soon light to come on. Because the IAV plays a role in emissions control, if the valve fails it may cause problems with the engine's emissions control system. You can plug a scanner into vehicles equipped with an OBD II port for a quick diagnostic of the car's check engine light issue."
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?
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