Speed ometer very erratic shoot up to 55 stays there even when driving faster or slower , drops down to 10 mph when parked
Sounds like the speedometer head. its cheaper to actually replace it rather than repair. find one close to your mileage . usually around $50.00
SOURCE: 1996 Crown Vic, Valve noise under heavy acceleration
No use what's in there, but have the engine de-carboned by a Ford dealer, or remove the octane adjust shorting bar located near the ignition module (retards timing 2 degrees), this will in most cases cure the issue unless there is allot of carbon in the cylinders. There are also methods of ing this de-carbon procedure at home, check on the internet for tips.
PLEASE RATE THIS SOLUTION
SOURCE: my 4.6 idles erratically.
try the following, if that doesn't correct it u may need to replace the air bypass valve.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: 2007 crown vic 4.6 l idles high on startup
This sounds like a normal condition.What happens is the cold start emission reduction component monitor(software program in the computer) is running.
Cold Start Emission Reduction Component Monitor
The Cold Start Emission Reduction Component Monitor was introduced for the 2006 MY on vehicles that meet the
LEV-II emission standards. The monitor works by validating the operation of the components of the system
required to achieve the cold start emission reduction strategy, namely retarded spark timing and elevated idle
airflow.
When the CSER strategy is enabled, the idle air control system will request a higher idle rpm, elevating engine
airflow. While this CSER elevated airflow is requested, the low airflow test compares the measured idle airflow from
the MAF sensor to the commanded idle airflow from the idle air control strategy.
SOURCE: THE CHECK ENGINE LIGHT STAYS ON AND THE CAR SURGES
Check your throtle position sensor. You need to check the code when the light is on.
SOURCE: my overdrive light is flashing
If your overdrive light is flashing, it is trying to tell you that there is a transmission failure. You will have to scan your powertrain control module to find out what is wrong.
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