Mercury sable trouble codes 1401 1131

1) Google the code with the car model; read the troubleshooting tips
2) replace the spark plug on 3 cylinder if worn out;
3) need to check the el wire condition which supplies el to cylinder 3 - might need to replace the whole wiring el . Package...
4) erase the code once the parts are replaced.

it will be better to replace all spark plugs at once

Be safe when working on el .parts

The PO 316 is still misfires om first 1000 revolutions
so the shop did a poor job for you on resolveing the
cylinder misfires

Try a diffferent shop

Have to clean the MAF Sensor & replace upstream
oxygen sensors if over 100,000 miles

Need the correct oem spark spark plugs/any brand

No reason the gas filter should be clogged unless it was in
the car for 10 years

Fuel pressure should be checked

Need to check for cylinder misfires on a road test of 20
miles or more with professional software in Mode#06

A 2008 mercury what? What is the model and engine size?

I’m happy to assist further over the phone at https://www.6ya.com/expert/kim_3202917d7c587455

Hi

P0305 is misfire in cylinder #5.
P0306 is misfire in cylinder#6.
P0316 is misfire on start up.
Have the plugs on those 2 cylinders, and the 2 fuel injectors checked, also check for spark from the coil on those 2 plug wires.

Please get back to us if you have further query or else please accept the solution.

Thanks for contacting fixya.com

P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Solutions:
Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

P0302 IS MISFIRE ON# 2 CYLINDER P0316 I THINK IS KNOCK SENSOR BUT IM OLNY 90% ON THAT

17704/P1296/004758
if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } 17704/P1296/004758 - Error in Mapped Cooling System Possible Symptoms

• Cold start issues

Possible Causes

• Coolant Temperature Sensor (G62) faulty
• Coolant Thermostat faulty

Possible Solutions

• Check Coolant Temperature Sensor (G62)
• Check Coolant Thermostat

16686/P0302/000770 Contents if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } 16686/P0302/000770 - Cylinder 2 Misfire Detected Possible Causes

• Ignition system
• Fuel injectors
• Fuel pressure
• Running out of fuel
• EVAP canister purge valve
• Evaporative emission system
• Low compression
• Base engine problems
• Controle Module damaged

Special Notes

• This feature search for engine misfire in a specific cylinder. Most of the time the cause for a misfire is a lack of combustion in a cylinder due to absence of spark, poor fuel metering, or poor compression.
  
  

The code P0302 means that the computer has detected a misfire on cylinder #2
Possible causes are
1. A mechanical problem with the engine
2. wiring,
3. ignition or fuel system
4. Injector
5. ECT (Engine coolant sensor or MAF (Mass airflow sensor)
6. ECM (Engine Control Module)

Next change swap the injector with another and see of the problem moves.  If it does it's a bad injector.  

You need to test for proper operation of the fuel injector, check for intake manifold vacuum leaks, and last check for possible low cylinder compression.