1996 Nissan Altima • 4 cylinder 2WD Automatic • 120,000 miles

No start when warm, I check for spark and spark
was orange, I replaced cap, rotor and wires check
coil and that checks out fine, and I was going to
check cam sensor but book said it is in the distributor, how can I check this.
February 7, 2011.

After doing my homework I answered my own question!The Camshaft sensor is located under the cap and rotor of the distributor. This is a common failure on the 2.4L engine due to oil leakage into the distributor.
I replaced the whole distributor which I purchased from the auto salvage, (i got lucky and found one that has been remand.)And replaced it and haven't had a starting problem since.
So good luck on anyone that is willing to try this but it worked for me.

Feb 16, 2011.
I was going to say check the crank sensor. Glad it's fixed and thanks for the information. I'm sure it will help others.