odd rough and delayed start issues

[PoisonBeef]

2002 s40 at about 140k miles

Cold start or warm starts, when you go to start it takes a few extra cranks (2-3 seconds) than it used too. Its very rough, and hard to discribe i guess. Embarrassing in parking lots.

If you start it, shut down and start right back up in starts instantly. If you wait 15 minutes then it take the 2-3 seconds of cranking.

I figured it was losing fuel pressure at the rail, but if you turn the key to the run position, and not start, then wait for 10 seconds it still has a delayed rough start.

I replaced the vacuum lines at the rail, and one of them was pretty cracked, but that didn't seem to change anything.

Any other suggestions besides the fuel pressure regulator? Them be expensive.

[zulu-v40]

My V40 began exhibiting the same symptoms recently. I replaced the Fuel Pressure Regulator and o-ring. All is well. Car starts right up without hesitation. I found the OEM (Weber) part pretty cheap at autopartswarehouse.com. Other places sell it for $20-$30 more. The housing for the Fuel Pressure Regulator on mine is integrated w/ the fuel rail. You need to figure out if you need the regulator or the regulator and housing. I'm thinking I might replace the coupling piece from the regulator to the throttle body too. It's part number 9202717 (s-shaped vacuum line w/ white plastic in between).

[PoisonBeef]

I guess I'll throw a fuel pressure regulator at it then.

I replaced that s-vacuum line a few months back hoping that it was the problem.

Thanks.