blupupher

iTrader: (2)

I had a similar issue with mine a few years ago.
Sometimes it would start almost normal, others it would crank for 8-10 seconds before starting. Once running, never an issue.
Thread with details

Short version is I changed fuel pump, filter, pressure regulator, crank sensor, cam sensor, cleaning MAF, all with no change.
Finally had to bring it to a shop, took them a day to figure out it was a failing PCM. It would intermittently delay the signal for spark and injectors.

Jbrew

I remember that. I didn't think of checking coil and injector signal back, that would of clued us in to a problem with PCM signal. Could of did that with a noid light. Yea, didn't think of it.

blupupher

iTrader: (2)

Yup, it was a PITA. 2 months of dinking around.
The noid light on the injector is what the mechanic finally used to close in on the problem.
2.5 years later and no problems with that (knock on wood).

bigaaron

FINALLY FIGURED THIS OUT.

I warmed the engine to normal operating temperature and did a KOEO (key on engine off) and noted the fuel pressure at the rail. The pressure went high, but immediately fell off. Fuel pump check valve bad - change the fuel pump. It does not do this all the time - fuel pump motor windings going bad - change the fuel pump.

I didn't want to do it again, but to make a long story short, I changed the fuel pump. Seems to be functioning properly.