S40 won't stay running

koby1 · Post by **koby1** » 08 Apr 2013, 05:16

My 2002 S40 was starting hard but then quit as soon as the foot is off the gas. The fuel filter and fuel pump have been replaced and it ran for a short while but is now doing the same thing. The mechanic can't figure it out.

s40_Ontario · Post by **s40_Ontario** » 21 May 2013, 20:54

I'd say the Fuel Pressure Regulator (FPR) or idle air control valve (IAC). Both are located at the throttle body, Remove the small hose from the FPR, turn key to pos II to activate fuel pump, if you see gas from the small vac hose, the FPR is bad (leaking). The IAC could be stuck or sticky and may need cleaning. You can disconnect the cable to see if there is any impact on the start-up/idle.