I have a 2001 bonneville with 135k have had no problems, but just returned from 5hr trip last weekend everything fine, then monday I try to start it and it starts then stops imediatly and now wont start at all. new battery so thats not a issue and half a tank of gas

it sounds like the idle air control sensor or the BCM/ Body Control Module

sounds like the coil pack is bad. ignition coil.

Check the batteries, you can have one bad cell and it will pull down the voltage from the other ones killing both over time

That thing is probably the ABS/ speed sensor. There is a hole or bracket it goes on. It wont hurt to drive it this way till you fix it. just make sure it doesn't get snagged on something on the road.

if it has a kick down cable that could be the problem look for a cable running from throttle to trans that can be adjusted in length

it may sound like you have a faulty batterie. it could be a short cut inside it that come and goes. Try another battry. Good luck!

well is the battery draining over the time its sitting?
could be a bad battery or alternator, and/or you might have something on the car constantly draining power from the battery.
best to have it looked at by a mechanic.

mostly your thermostat . how is your engine heat ?

have your alternator check

have you not left any load on overnight?..like park light or left the door partially open and the dome light would be left on?

have the battery recharge and the next night, make sure that no light would be left on the car.

if it would drain out again, have it recharged again, use it and on the night, make sure no light is left on the car, then remove the positive pole on the battery overnight.

the next morning, put the positive cable back and start the car.

if the car would start, then no problem with the battery, if the car would not start, then return the battery because it is defective.

tnx 4 using fixya,

drcool