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My 99 silverado won't start unlessi turn ignition switch to on, i then hear a winding noise for maybe 20 seconds & then stops. then turn ignition switch to start, truck then starts right away. no problems when running
when switching on ignition and starting engine, tickover is erratic for about 20 seconds and then clears itselfwhen switching on ignition and starting engine, tickover is erratic for about 20 seconds and then clears itself
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Your ignition switch is going bad. The strange noise is the starter remaining engaged and locked to the flywheel. Your best bet is to have the starter tested at your local auto parts store, to deduce that it is not, in fact, your starter.
Try starting the truck so it makes the noise. Then switch the air control to "fresh". If noise stops, it is probably the motor that closes flap to recycle the cab air. It would be found under the dash, under the glove box, & would need to be replaced.
I had a similar problem on my '99 Golf and it turned out to be a worn-out turn signal switch. When I replaced it, I found that the innards were corroded pretty bad.
TRY REPROGRAM KEY .PUT KEY IN IGNITION SWITCH TURN IGNITION SWITCH ON POSITION 20 SECONDS DONT START ENGINE WAIT 20 SECONDS TURN OFF SWITCH THEN TURN SWITCH BACK ON 20 SECONDS WATCH THE THEFT SECURITY LIGHT BLINKING.WHEN THEFT STOP BLINKING VECHICLE WILL CRANK.IF LIGHT STILL BLINKING.TRY FEW MORE TIMES KEY IN SWITCH ON POSITION FOR 20 SECONDS.MAKE SURE YOU HAVE THE CORRECT CAR KEYS IN SWITCH IF NOT WRONG SET OF CAR KEYS WILL SET OFF THEFT SECURITY SYSTEM.IF KEY RESETTING TRICK DONT WORK.CHECK BATTERY POWER MAKE SURE YOUR BATTERY HAS 12.5 VOLTS AND CHECK SECURITY THEFT FUSE.IF ALL LOOKS GOOD YOUR SECURITY HAS TO BE CHECKED OUT AT THE DEALERSHIP.
The humming noise you hear is the fuel pump. It is probably your starter soleniod. If you hear an electric click under the dash near the steering column when you turn the key then the ignition switch is ok and your starter needs to be replaced. This happened to me last month.
when switching on ignition and starting engine, tickover is erratic for about 20 seconds and then clears itself
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