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93 ford ranger 2.3L replace plugs,wires,&coil packs motor still running with dead cylinder. what could be the problem

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The 2.3 engine is well known for plugged oil lines in the camshaft. You didn't say which cylinder isn't firing but if its number 3 or 4, you may well have a worn cam lobe. This will not show up on a compression test since the valve can't open due to the worn cam lobe. You will have to remove the valve cover and watch the valves move while turning the motor with a wrench on the harmonic damper/crank pulley bolt. Expect a repair bill in the $600 - $800 range. New cam and valve job.

Posted on Apr 15, 2009

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Possible valve trouble. Do a compression test.

Posted on Apr 14, 2009

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1995 ford ranger onlu sparking to 3 cylinders


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1998 ford ranger


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1994 ranger. 2.3 engine. 8plug model. Dead miss in number 2 cylinder. Changed the plugs, wires and coil pack. Still a dead miss. If the person I got the truck from broke the timing belt while the engine...


that engine is a non-interference engine, so it should not have been damaged when the timing belt failed-I'd check the injector and see if it has good compression in the cylinder, and if it is low, squirt oul in the cylinder and test again-if it picks up alot of compression after doing this, you have a bad/broken compression ring, if it does not pick up, it is a valve,

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My truck is missing on the forth and fifth


things that can cause it to miss.
fouled plug (checked)
bad wires(checked)
coil pack(checked)
ignition signal to coil pack( switch old coil pack to a working cylinder to make sure its good and you may find a possible short in the wiring to the coil pack) alternately check the voltage to the wires going to the coils make sure like colors have like voltages. im not too big into ford trucks but thats a good start for most vehicles
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Coil pack should in the front top of motor, with engine running remove one spark plug wire at a time from coil pack ( careful not to get shock ) they should all have spark, if one don't replace coil pack.

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Missfire in cylinder 2


I assume you know the problem is a misfire in #2 cylinder from checking the diagnostics code. Although these codes can be helpful in narrowing down a problem they lack specific details. In the case there are several possible items that could trigger the engine fault code P0302

These include:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Before you spend any money to resolve this you need to narrow this list down even more. Start by pulling the plug. Do a image web search on "spark plug diagnosis". This will give you pictures of plugs with a variety of problems to compare with yours and give you an indication whether or not the plugs need replacing. Next if possible switch #2 plug wire with another. Make sure you switch both ends (coil end and spark plug end) of the spark plug wire.
These are the no or low cost options. Beyond these you will need to start replacing items like the Ignition Coil and O2 sensor.
If you are still having the problem after checking and/or replacing the items listed above, your next step is a compression test on #2 cylinder.
If you get to this point please repost here with the results with the wires and plugs and I will give you the steps to follow with compression testing.
Hope this helps.

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1 Answer

1990 ford ranger 2.3L running rough at idle and while driving


Hi check all the fuse. fi the fuse are ok . remove the coil pack and reverce if the cly missifire change replace the coil if not chage replace the electronic comtrol module ok.

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1 Answer

Rough running, erratic spark


Run a compression test on the cylinders.If reading is low on any drop a little engine oil into the pot. If compression rises you have compession ring problems. Remove all plugs before you try this and place leads away from engine.

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