I just did a hell of a lot of work to my 99 300M and now that it's all back together it won't start. The car has 115k miles. I had an O2 sensor back out of it's thread, and decided to go ahead and relpace a number of things at once. Before the O2 sensor had backed out, the car ran fine - great even. I replaced the timing belt, water pump, serpentine belt, serpentine idler pulley, AC belt, one O2 sensor (forward sensor on driver's side), and all 6 sparkplugs.
When it was all back together, I went to start the car and found that the battery had died (it was sitting for about 2 weeks). I went ahead and replaced the battery as well because it was the original that came with the car. When I put the new battery in, I noticed that the leads were badly corroded. Anyway, I had power.
The FIRST time that I tried to start it, it turned over but didn't fire. The SECOND time I tried, it would not even turn over; the voltage would drop when turning the ignition key to ON, and when turning it to START, I got a clicking noise like a weak battery. My guess was that the corroded terminal leads needed to be replaced, so I replaced them. Now, I can turn the car over, no power drop to ON, but there's no spark at all at the plugs.
Here's the details - I was careful to ensure that all of the timing marks were aligned on the timing belt cam pulleys and the crank pulley. I've double-checked the gap on all of the spark plugs. I get no spark at the plugs when turning over the engine. I get no power on the green lead to the coilpacks with the ignition key ON. I do have continuity between the ASD relay and the coilpack leads. I have power to the ASD relay from the battery, and I'm assuming that the PCM is shutting down the ASD relay. I haven't yet got up the courage to jump the ASD relay to see if I can get spark to the plugs, because I'm not sure what else is controlled by the ASD relay (I expect it's only the fuel pump, but I'm not certain). I tried the ON-OFF-ON-OFF-ON trick, and the only code was the one that the battery had been disconnected in the last 50 starts.
Any assistance/advice/help would be greatly appreciated. I'm going broke using my wife's Expedition as a commuter car.
-dave