99 Sentra cranks but won't start -ran several tests
My 99 Sentra has run well for years. Then, a few days ago we parked it after a trip to the gas stations (fill-up), and in the morning she would crack but not start. Here are the facts:
1. Radio, lights, wipers all work and starter cranks fine.
2. I tried to jump start even though the above indicated that battery/alternator were probably OK. No change.
3. I can hear the fuel pump wrrr when I crank
4. I removed the hose on the engine side of the fuel filter and gas purts out when I crank, so gas is getting as far as past the filter.
5. I replace the distributor and rotor and cap. No change.
6. I tested the cylinder compression. All four range between 100 and 110. I do not know if this is good or bad.
7. The plugs have some blackening on the ends.
8. I removed each spark plug boot one at a time and tested for spark with a screwdriver in the boot. With a gap varying 1/8" to 1/4" between the screwdriver shaft and ground I consistently got spark about every second, but it was always orange and not blue.
9. I checked the ECU and did a diagnostic- the code I get is 55, indicating no errors.
10. I have read something about a coolant sensor (ECT?) but I do not know if my symptoms would suggest that to be the culprit.
What else can I do? I can't even get a misfire.