99 Silverado hard hot start
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99 Silverado hard hot start
Have a 1999 Silverado,48k, with a 5.3 that starts immediately when engine is cold but 3 to 4 seconds of cranking required with a warm engine. Been working on diesels so long the later model gas engines are becoming like a foreign language to me. Was thinking possibly a fuel pressure problem, but just guessing here. When running, runs and idles like when it was new. There are no codes in ECM. Thanks for any help you may have.
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checking fuel pressure would probably be a good start you might also see if it starts quicker if you hold the gas pedal down aways if it does would suspect engine is flooding due to the fuel pressure regulator.
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my 2000 sierra does the same thing, but sometimes it takes 2 or 3 tried to get it to crank and i have to have the gas all the way to the floor. ive changed out plugs, and air filter. also, i smell gas when it does crank up, is that normal?
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holding the gas to the floor actually shuts off the injector pulse so a flooded engine will start easier even if you dont hold it quite all the way to the floor it still allows alot more air versus leaving the throttle closed.
fuel pressure regulator failure is very common on these models have changed a bunch even on low mileage pickups. pull the vacum line off the regulator and cycle the key on and off about 10-15 times while having somone watch the regulator if it spits any gas out its bad and needs replaced.
fuel pressure regulator failure is very common on these models have changed a bunch even on low mileage pickups. pull the vacum line off the regulator and cycle the key on and off about 10-15 times while having somone watch the regulator if it spits any gas out its bad and needs replaced.