Question about 2008 Ford Taurus
Reads 1200-1500 less than the engine RPM, what sensor feeds the RPM gauge?
Posted by Anonymous on
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Posted on Jan 02, 2017
To do this in park or neutral is normal. To do it while driving is not.
There are so many things that could cause this but if you have no check engine light and it runs normally up until then I would suspect you have an exhaust restriction. This can be checked fairly easy on this vehicle, it has a DPFE sensor that mounts near the top back side of the motor.It will either be black or silver,will have a 3 wire connector to it and 2 hoses going down the back of the motor to the exhaust. You can disconnect one of these hoses and install a vacuum/pressure guage and measure exhaust back pressure. It should be 1 psi or less at idle and when you go to wide open throttle should not exceed 3 to 4 psi. If it does something in exhaust,most likely one of the catalytic convertors is stopped up.
Posted on Feb 19, 2009
SOURCE: EGR EVP Sensor
Right on top of the EGR, (Exhaust Gas Recirculation), valve, which is on top of the intake.
Looks like this,
Now, let's talk. The guy's and gal's at the auto parts stores, are just there to sell auto parts, not diagnose cars, pickup trucks, and so on. Nice that they try to help, but an ODB II scanner just shows generic information.
What I'm stating by that, is that you could buy that expensive part, and this may not cure your problem, and/or you could damage your computer if the procedure isn't done correctly.
The P1400 code states,
1.DPF EGR signal circuit shorted to ground
2.DPF EGR signal VREF circuit open
3.DPF EGR sensor is damaged or has failed
4.PCM has failed (Powertrain Control Module)
5.TSB 4-3-1 contains repair information for this trouble code
You need a scanner that is the NGR, (New Generation Star), or has the capability to read
Ford Enhanced Data.
This connects to the PCM in the harness. (It's located on top of the engine) If the procedure isn't done right, you can "Let the smoke out", of the PCM.
You also have to reset the computer to clear the error code.
I know shop time is expensive, but sometimes it leads to less expense in the long run.
Posted on Apr 28, 2009
Are you getting any codes from the Check Engine Light? This sounds like it could have something to do with a sensor. Check your air filter and make sure it's clean. The tach on my 1999 doesn't really work, but it hasn't coincided with other driveability problems. The engine doesn't change in it's RPM's, the tachometer just stops working. Have your charging system checked. The shaking might be coming from bad fuel pump operation, clogged fuel filter, or dirty fuel injectors. Try putting an additive into your gastank to clean the injectors (a bottle of Seafoam is great for this). Try calling your local Autozone and see if they do free trouble code scanning. This might help lead you in a better direction.
Posted on Jun 29, 2009
1. Have you looked at your owners manual for location of the cruise control fuses? 2. Same for the tachometer? 3. Do you live in a wet area with alot of rain? Next chance you have, get some electric cleanout spray from NAPA spray into all cruise control connections and tach connections. 4. Check the recalls from Ford there have been issues with 99 cruise econtrol systems.
Posted on Jul 03, 2010
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