2003/04 Taurus Acting Odd? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

merfed · 07-12-2010, 17:54

Well, I was driving a few days ago and noticed that when I hit around 40, the car would buck forward and feel as if I lifted my foot of the gas. I passed it off as nothing, then about 5 minutes later it did it again, this time the check engine light came on. I was over by advanced auto parts, so I had them read the code. I don't remember the exact code read, but it had something to do with the fuel rail pressure sensor. I haven't driven the car much, if at all sense then. But when I turn it on, its RPMs fluctuate a little bit, before dropping down to the "1".

Just wanna get a little more info before I go drop the $140 on the new fuel rail pressure sensor.

**360ci** · 07-17-2010, 19:09

Obviously I'd think that sensor is doing it's job and doesn't require replacement. I'd get the fuel pressure checked. Low fuel press can cause a raft of driveability problems, not to mention misfires and the like.

Just to test it out, instead of starting the car right away, just turn the key to 'run', so the accessories and dash lights come on, wait about twenty seconds, as the fuel pump will prime the system. If idle is better after startup and gets worse as you drive or let the car idle for a longer period, then it's more than likely a pump on the way out, or a clogged filter.

**360ci** · 07-17-2010, 19:10

It could also be your IAC sensor, or idle air controller, located on the throttle body. It can be cleaned if you're careful (soak in carb cleaner), if you move the plunger more than 1/4" you'll need a new one (about $50). If you have some mechanical knowledge you can replace it yourself, and it's less cost than the sensor you mentioned.