Question about 1994 Ford Ranger Supercab

3 Answers

94 ranger 2.3 acts like a plug is fouled but isnt driving loses power like running on 3 cylinders then picks back up and runs fine intermitent no pattern new plugs, wires, o2 sensor, mass air flow. could throttle position sensor cause this ?

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  • iowajoe39 Nov 17, 2009

    coil is firing on all four cylinders even when running rough

  • iowajoe39 Nov 18, 2009

    coils good maf good o2 sensor replaced problem is intermittent so not timing belt

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3 Answers

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  • Ford Master
  • 6,826 Answers

I would check the coil pack,and try to get it to mess up,and determine if it is ignition,or a fuel injector,,but the coil pack can make it not hit,on just one cylinder,If it is only hiting on 3 cylinders,then it will have a dead miss in the engine,ocyliscope may be the best way to find this,os a old fasion timing light,and put the lead on one plug at a time ,and apply a losd on the engine to make it miss,then go to the next wire,and the next,and so on.See if a code reader will pick up a code aslo,if it does,and one cylinder is not hitting all the time,it can show up,in the code,and it will tell you witch cylinder is at fault.Auto zone offers this free of charge,to run code reader on the truck.If this was at all helpful,please let us know,thank you.

Posted on Nov 17, 2009

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 17, 2009

    Have the fuel pressure checked,to see if it is just below the normal.Also,a fuel injector may be the problem.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 18, 2009

    Have the fuel pressure checked,to see if it is just below the normal.Also,a fuel injector may be the problem.


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  • Master
  • 10,515 Answers

Hi,

Before i could comment, i would like to Advise :-

If you see Engine Light Stays ON, then kindly take the car to the Auto Zone to get Car Scanned for Codes. You would get Error Codes that would tell you exactly what to troubleshoot. This car has already showed some serious engine troubles in the past.

Now,

In case, if the Engine Light is not ON, we need to troubleshoot by making some intelligent Guess.. A stretched timing belt . I would start with checking fuel pressure (32 to 35 PSI) and then Make sure its not a skipped timing belt by following theses steps.

Check timing belt alignment. Remove the plastic plug on the front of the timing cover. Check to verify that the camshaft timing gear alignment XXXX XXnes up with the indicator when the engine is at Top Dead Center (TDC) for #1 cylinder on a compression stroke. Replace the timing belt as necessary.

If the timing belt alignment is OK, disconnect the intake side ignition coil packs primary connector and test drive the vehicle to determine if the engine runs worse or better. With the engine idling, reconnect the intake side coil pack and disconnect the exhaust side coil packs primary connector to see if it runs better or worse on the intake side coil pack.

If the engine runs significantly better on one coil pack than the other, replace the defective coil pack.

If the engine does not appear to run any different on one coil pack vs. the other, cut the Light Blue/Red (LB/R) wire at the MAF sensor connection and connect a Digital Volt Ohmmeter (DVOM) to the sensor side of the cut wire to monitor output voltage of the sensor when driving.
A typical idle voltage of the MAF sensor will indicate 0.7-1.0 volt. When snap accelerating the throttle, the MAF should be capable of producing over 3.0 volts.

If the output of the replacement MAF sensor is low but there is nothing causing an engine airflow problem such as a timing belt alignment or exhaust restriction issue, replace the replacement MAF sensor and recheck conditions.

Other than this, it is also known for Oxygen Sensor Fault.

Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Nov 17, 2009

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  • Master
  • 3,513 Answers

Hi
When the car does not want to start you need to check if the starter is not wanting to turn or if it's not getting the 12v need to turn. Get a voltmeter and test the voltage at the starter when it does not want to turn, if you see 12v when attempting to start but it does not turn that means your starter is bad. However if you measure and you don't get the 12v then the ignition cylinder is bad (where you put the key in). This is actually a common problem, when you turn your key it supplies power to your electronics but does not supply power to the starter.
However loss of power in the car can be frustrating on the road . So check the engine regularly for any problems that may cause the car to lose power.
Step 1 ..Check the battery if the car won't start. Even if the lights, gauges and dashboard are working, there still might not be enough power to ignite the car. If this is the case, you need to replace the battery.
Step 2.. Make sure the alternator is good, as this is what keeps the battery charged. A bad alternator will cause the battery's power to drain much faster. Replace the alternator if the battery is quickly losing power.
Step 3 ...Inspect the fuel lines for any leaks. A leak will not only cause you to lose gas while the car is in idle but will also prevent the right amount of gas from going to the engine. You could patch the leak but replacing the line is best.
Step 4 ..See that the air filter is fresh and unclogged. A clogged filter will restrict air flow, reducing both power and gas mileage. Change the filter every 12,000 miles or once it's very dirty.
Step 5... Replace any old or worn spark plugs. As a spark plug ages, the space between the tip and the hook widens, making it harder to ignite the fuel and power the engine.
Step 6... Take the car to a professional mechanic for anything that may be more complex (like the fuel injection system). As cars become more advanced with computerized technology, any maintenance by an amateur could cause even more damage
Thanks for contacting fixya.com

Posted on Nov 17, 2009

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