2000 bonneville will not crank-battery good-starter good
When ignition key turned to start all instruments self test and I hear a soft buzzing sound as everything goes dead. Battery test good at terminals. Suspect fuse or ignition related relay. Any guidance.
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That should be enough gas. Maybe the fuel pump is not working. Turn the key to on- you should hear the buzz or whine of the pump iin the gas tank for about 2 seconds. It should turn on briefly to pressurize the fuel line and then shut off until the car is cranked over. If you don't hear anything from the rear when turning the key to on, the pump may have quit working or power is not getting to it. Occasionally, a pump will still work but not well enough to make sufficient pressure for the fuel injectors to work. To check that, the pressure would have to be tested. So, listen for the pump. If good, check your ignition by checking for spark at a sparkplug. If no spark, the ignition system will have to be checked and tests run to find the problem. If you have spark and still no go, test the fuel pressure. If pressure is low, replace the fuel filter and re-test.
Sounds like a bad battery connection or bad battery. A battery can have enough power to light the instrument panel but not enough to engage starter motor. If the battery and connections proves to be good, then have the starter tested.
Do you have crank no start?
Do you have no crank no dash lights nothing?
Items to check out Battery and battery cables (Load test battery and make sure cables are clean and tight especially the B+ cable off the starter).
Listen to the cranking speed of the starter. Does it sound normal or slow? Depending on what you hear you may want to do a starter current draw test or have a shop do it for you.
If all of the above are a-ok then move onto fuel and ignition checks. AT THIS POINT YOU SHOULD HAVE CRANK NO START.
When you put the key into the ignition and turn it to on position do you hear the fuel pump buzz?
No buzzing sound ... you could have either a bad fuel
pump or relay. Either way the vehicle is going to a shop for further diagnosis and repair.
Unscrew a spark plug attach it to its wire and ground its electrode . Crank engine and look for spark.
No spark! Now check plug wires and coil. How? Use shop manual for correct testing procedure .
If no spark is found coming from the coil then check B+ coming from battery to coil and ignition module.
Lastly not likely , ignition switch should not be left out of the equation. Your gonna need the shop manual for that test procedure. Good luck