- 2004 ford taurus fuel pump problems driver#
- 2004 ford taurus fuel pump problems full#
- 2004 ford taurus fuel pump problems code#
Suddenly, The Engine Began Speeding And We Had To Apply The Brakes And Ride The Brakes To Keep The Speed At 45. I'll post the "good shots" in a separate reply to reduce confusion.We Were Driving Into Aurora, Il On Hwy 88.
This pump was about to leave this little old lady walking or feeling like she has to push the car.
2004 ford taurus fuel pump problems code#
There was no P0191 code on this because fuel pressure never dropped to low. In regards to the pump command, the PCM is screaming "I'm giving her all she's got captain!"
2004 ford taurus fuel pump problems driver#
AS the driver in the seat, I can't tell for feel. Double that on the PID, and the pump is actually running 100% of the time just to barely keep up with the injectors. You can see the commend is at 50% just to make enough pressure. In the RPMS, you can see that it just hit 5800 rpms, and the trans shifted (that's why the RPMS dropped). In the second one, I am driving the same bad pump now with my foot on the gas at wide open throttle.
2004 ford taurus fuel pump problems full#
It is having to run at near full capacity at idle. So 40.33% on the scanner here means that the pump was having to run at 80.66% of the time just to make enough pressure to keep up with the injectors at idle. The fuel pump driver module doubles that at the pump. the command from the PCM to the fuel pump driver module (FP#) was at 40.33%. You can see in the first one that at idle, I had a good 40psi (FRP), but. This engine ran good while I had it because it was getting enough pressure. Even though both of these fuel pressures are "good", the pump is still bad because it is having to work too hard to achieve a good pressure. The first one is at idle and the second one is at WOT. I included the RPMs so you can see what the engine was doing. You'll see the FRP reading 40psi which is target for this vehicle. The first one is a bad fuel pump on a Contour (got it today). along with P0171 and P0174 (bank 1 and 2 lean) pressure is NOT targeted on engine load like old returnless systems that used a vacuum operated pressure reg and return line.Īny codes? a dying fuel pump will set a P0191 (FRP performance) and often a P0148 (Fuel delivery error). Target is 40psi on cold fuel, and up to 55 psi on on hot fuel. The PCM watches the fuel rail pressure sensor (FRP) and commands the pump on enough to achieve target pressure.
What you are seeing when you see the pressure raise and low, is the pump turning on and off. the twist there is that whatever duty cycle is present on the PCM data PID, the FPDM will double that (25% command from the PCM is 50% from the FPDM to the pump, 50% command from the PCM is 100% on command from the FPDM to the pump). Then you'd also have to use an oscilloscope to check the output of the fuel pump driver module to ensure it is ramping up the pump "on" time per the command from the PCM (just because the PCM is commanding it, doesn't mean the driver module is running the pump right). When using a scan tool to determine a pump problem, you'd not only look at pressure but also percentage of pump "on" time (40psi at idle with 23% duty cylce from PCM is good, but 40psi at idle with 45% duty cycle from PCM is bad). To get the 2 to match, you will need to unplug the vacuum hose to the FRP to get the FRP referenced to atmospheric air like the gauge is. The 2 do not match because the FRP sensor is referenced to manifold vacuum and the mechanical gauge is referenced to atmospheric air. The pump would have to be nearly dead for a mechanical gauge to work. In fact, a mechanical gauge is of very little help on that electronic retunless system. The spec is as it is read through the fuel rail pressure sensor. Ignore the specs unless you have a scan tool that can read fuel pressure.
0 kommentar(er)
