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.
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 .
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...
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
SOURCE: EGR EVP Sensor
Right on top of the EGR, (Exhaust Gas Recirculation), valve, which is on top of the intake.
Looks like this,
http://fordfuelinjection.com/index.php?p=35
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.
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.
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
To install:
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
To install:
continue...
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