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1991 Crown Vic. Hard to start, and hesitates when trying to take off, replaced the egr, Evp & tps sensors, did not work.

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Did you check your TPS sensor? Throttle Position Sensor? this could you be your culprit friend!

hope this helps! NOTE: old TPS sensors get stuck with old age, and dirt. when this happens it will be hard to accelerate or do anything with the vehicle.

Posted on Aug 21, 2017

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May be weak fuel pump or check valve letting residual pressure bleed back to pump . What is the running pressure at idle ? Fuel volume is important also .

Posted on Aug 21, 2017


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Posted on Jan 02, 2017

SOURCE: 1989 Grand Marquis 5.0 hesitation under load at 25, 40, 50 mph and slightly rough idle

What happens when you unplug and cap the vacuum line at the EGR valve? Does the problem go away? Before doing this does the car idle rough? If so perhaps the EGR is stuck open...

Posted on Sep 16, 2008

  • 1 Answer

SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

its just white cuz i too the cat off..

cuz i thought my proble could have been to do with the cat...

cuz i lost power driving up hills and on highways now it just will start the die right away

or start and idle really bad...

any ideas???

i was thinking crank sensor.. or injectors

Posted on Oct 01, 2008

  • 5660 Answers


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

  • 1 Answer

SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

I had the same problem with my Z when i had it. But it worked when i just left the little hose off of the EGR valve.

Posted on Jun 13, 2009

  • 17970 Answers

SOURCE: How to replace egr valve on 1995 crown vic 4.6.

On 1995 Crown Victoria the EGR valve is located at the rear of the engine compartment. While the attaching bolts can be gotten out with a little bit of a problem the egr tube that atteches the EGR valve to the right exhaust manifold is a pain. It is possible to do though. Here are the removal and installation instructions. If you are sure that the EGR valve is the reason for any check engine light then you can remove the battery cable for about five minutes to reset the light, but if the light is on for a differant reason then you just got rid of the code plus any freeze frame data that a shop could have used to diagnose the problem.

Check this procedure about REMOVAL & INSTALLATION...

PFED Sensor
See Figures 9, 10, 11 and 12

Fig. 9: Detach the connector for the DPFE sensor

Fig. 10: Matchmark and remove the vacuum hoses for the DPFE sensor and ...

Fig. 11: ... remove the retaining nuts from the DPFE sensor and ...

Fig. 12: ... remove the DPFE sensor from the intake manifold

  1. Disconnect the negative battery cable.
  2. Label and disconnect the wiring harness from the DPFE sensor.
  3. Label and disconnect the vacuum hoses.
  4. Remove the mounting screws and remove the DPFE sensor.
To install:
  1. Position the DPFE sensor and tighten the mounting screws.
  2. Attach all necessary hoses and wiring to the sensor.
  3. Connect the negative battery cable.

EGR Valve Control Solenoid
See Figures 13 through 17

Fig. 13: Detach the connector for the EVR solenoid

Fig. 14: Match mark the vacuum hoses for the EVR solenoid and ...

Fig. 15: ... remove the vacuum hoses from the EVR solenoid

Fig. 16: Remove the retaining nut for the solenoid and ...

Fig. 17: ... remove the solenoid from the intake manifold
  1. Disconnect the negative battery cable.
  2. Label and detach the vacuum hoses from the EVR solenoid.
  3. Detach the electrical connector from the solenoid.
  4. Remove the retaining hardware, and remove the solenoid.
To install:
  1. Position the solenoid and install the retaining hardware.
  2. Attach the main emission vacuum control connector and the wiring harness connector to the EVR solenoid.
  3. Connect the negative battery cable.


Posted on Jul 16, 2010

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How to replace the egr valve position sensor on a 1994 ford crown vic

the positions of the EGR are close, but they are 2 different units. Look on the back of the upper plenum. You will either see a round aluminum item with an orange/red plunger in it that bolts to the 90 degree elbow, or you will see a plate that bolts to the upper plenum itself. The round aluminum one is the EGR Valve for that model. If it has the plate bolted directly to the plenum, that will be the backpressure transducer.

On both models, you will see a round black plastic cylinder unit. That is the EGR solenoid. There will be 2 tubes on it - one to the upper plenum and fuel regulator, and the other to either the EGR Valve or the backpressure transducer.

Either one you have, they are hard to see. They are on the back, and hard to work on. Mine had the EGR Valve on the elbow, and it was tight to get on/off. I found the easiest way to get it taken apart is to take the elbow off, then the EGR valve, and work on it this way. Made things ALOT easier. Just be careful and try not to break the gasket in between the elbow and the upper plenum.

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1 Answer

96 Crown Vic will not start. Has spark, has fuel, crash button is set, has oil, Will run when fuel start is sprayed into carb. Any ideas ?

Check your fuel pressure to the Injectors at the pressure valve. Then check the wiring to the Injectors to see if they are getting power. Backtrack the Injector wiring if it is dead.

Your Crankshaft and Cam sensors would be working to supply the sparkplugs their power in the firing sequence. You need to check the part that supplies the Injectors their power in sequence.

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What happens when you unplug and cap the vacuum line at the EGR valve? Does the problem go away? Before doing this does the car idle rough? If so perhaps the EGR is stuck open...

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