I admit I'm a novice at best when it come to working on cars. I bought this car in july 2008. It was always dependable until the cooler weather set in, around October. at that time it all of a sudden one morning upon starting, started up but it was chugging and blowing blue exhaust. I figured it was a sensor. so I said to heck with it and let it sit for about 2 or three weeks. Then one morning I felt lucky and went to crank it over and bingo! Started up like a charm and ran great. I just intuitively thought it was a sensor and figured maybe the cars computer system would catch up to the climate change. Now, here it is December, I drove it 40-50 miles one night, seat warmers on, heater on, lights on, cd player on. I was on the highway though for some of this. two days later I moved it to park it in a better spot. It was a cold day. It sat for about 4 days. Early in the morning and it was one of those frozen frosty cold mornings, I went to start it and it just cranked and tried to catch a couple of times. I turned it over 5 or 6 times in 20 second intervals. the cranking just kept getting weaker.
So, I figured it's the battery. I removed the battery and took it to auto zone and it was at 75% charge. they charged it up for me and tested it under a heavy load and told me they were sure the battery is good. The battery is an interstate but it's an '02.
I tried starting it some more, same result. Today it was 2 degrees. So I figured I'd put the battery to the test and see if it peatered out under the extreme cold. After 5 attempts at starting with 20 second intervals and different throttle positions it stopped wanting to turn over. I'm thinking the autozone dudes are not familiar with the extra demands these cars put on batteries. It could be the fuel pump though because was sputtering a little bit at times for like 2 seconds like it wanted to start, yet it never really fired up at all. I kept wanting to use starter fluid, I refrained from doing so. I don't know. fuel pump, battery, sensors, timing? I need help. Thank you!