Ford Ranger:

2004 i4 Intermediate misfire

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#1 5/25/2017 6:22 PM

Rycerz
New member
Registered: 5/25/2017
Posts: 2

2004 i4 Intermediate misfire

So I'm going to try and keep this short for now ask any questions as needed. I have a 2004 Duratec Ranger the original motor had a wrist pin go out on it so I bought a donor truck, a 2002 Duratec and put the motor from that one into my truck. Ever since the swap there has been something off about this setup. I used all 02 sensors on the long block but everything else was left 2004. The motor has bad oil control rings. The setup misfires under load. The miss doesn't cause a lot of vibrations from the motor. It's constantly low on power but about 4 times since I have done the swap I have had full power. I had an aftermarket muffler on for a bit of time and the last time it had full power I noticed it had a lot more of the normal Duratec sound (sounded like a rice burner instead of deep like it was). I was throwing a code for low coolant temperature so I replaced the t-stat and when it continued I looked at the temperature sensors and when I went to pull the cylinder head temperature sensor it snapped off in the head 😫 So I now have a code for the lack of a sensor that's the only code currently.

Last edited by Rycerz (5/25/2017 6:28 PM)

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#2 5/25/2017 7:38 PM

TechHelp2
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Registered: 11/23/2009
Posts: 1243

Re: 2004 i4 Intermediate misfire

An engine miss under a load is usually related to a spark plug not being able to handle the load at certain RPM's. Also check your ignition system making sure there is no arcing anyplace when the engine is under a load. A simple way to check this out is have someone power brake the truck and observe the engine in the dark looking for any arcing.


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#3 5/28/2017 3:53 PM

Rycerz
New member
Registered: 5/25/2017
Posts: 2

Re: 2004 i4 Intermediate misfire

Ok thank you I will try that either tonight or tomorrow night and reply with the results

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