I have a 2003 Altima 2.5, just hit 70k. On a cold start, it takes about 10 to 15 minutes to get the engine to turn over. It just cranks and cranks and cranks and eventually it starts. During all the cranking it turns over a couple times for a few seconds and seems to be misfiring and then it dies again. Check engine error read bad crank sensor, so I replaced it. Problem still persists. Then check engine error read bad cam sensor, so I replaced that as well. Problem still persists. I have changed the spark plugs, and all the ignition coils are new. A friend suggested that it may be a check valve in the fuel pump. Anyone have any other suggestions? Your input is greatly appreciated.
First, change the fuel filter, and make sure the lines are good. Check the intake manifold bolts for tighness, check all vacuum lines. Best to have it running, wiggle them around and listen for a hiss. Lastly, change idle control sensor, if the other suggestions don't make a difference.
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I played around with the fuel pump and i got the problem to go away for a few days, but now it's starting to happen again. Looks like I'm going to be replacing that pump. Thanks for the help!
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