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DOHC - 2.3L Duratec / Mazda L Engines Discussions and Topics specific to the Duratec 4 cylinder engines

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  #1  
Old 08-20-2015
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Engine Shaking

Hello,

I have a 2005 ford ranger 4 cylinder 2.3L 2wd. Recently my engine has been shaking, I replaced all the spark plugs and spark wires hoping that was all it was but it still continued. I checked the errors today and had 14, all were misfires for cylinders 3 and 4. I thought it might be bad fuel but it doesn't make sense since their were only 2 coils misfiring. Is it possible the cylinders are in a series and the ignition coil or coil pack is going bad? Any ideas?
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Old 08-20-2015
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What did the old spark plugs in #3 and #4 look like?

Did they show oil or carbon build up?

How many miles on the vehicle/engine?

The coil pack only has 2 coils inside:
Ford uses the "Waste Spark" system
#1 and #4 use the same coil, #2 and #3 use the other coil

So the spark plugs in #1 and #4 both fire on each 1 revolution of the crank, one will be on compression stroke the other on exhaust stroke, so one spark is "wasted"

Same for #2 and #3

I would rent/get a compression gauge and remove all spark plugs then do a compression test.
Write down results

Compression is a fixed result, it can't be intermittent like spark or fuel, so you won't waste your time chasing spark and fuel issues if it is a compression issue.

If you can rent/get a fuel pressure gauge at the same time you can also take off the table, it is another you got it or you don't result.
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Old 08-20-2015
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I've got 178,000 miles on it. The plugs all looked okay except the 4th one, it was missing the white ceramic looking internal part. I should go about renting a compression guage
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Old 08-21-2015
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178k isn't much for the 2.3l Duratec engine so not a mileage relayed issue.

When doing compression test make sure you hear 4 or 5 "hits" of compression stroke, start at #1 and when removing tester check the end for fuel, there should be some, then clean off the end
When you get 3 and 4 also check, you are looking for possible fuel pressure or injector issue, lack of fuel on the end of tester.
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Old 08-22-2015
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My 2000 2.5L had the same symptons and threw code P0303. I replaced the rear coil pack and it took care of the problem. I have 186,000 miles. Soon, I will replace the other coil pack just for good measure. Coil packs for mine are about $60 at RockAuto.com.
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