4.0 OHV eating spark plugs? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 07-03-2010
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Icon9 4.0 OHV eating spark plugs?

Hey everyone,

Got a question. What would cause my engine to go through spark plugs like candy? Its a 4.0L OHV with 110k miles on it, and I don't beat the truck, but it seems like every 4 months the plug in cylinder 4 begins to misfire, and when I take the plug out, I find the insulator cracked, broken, or completely gone. I've changed the plugs out 4 times in the past year, it's getting annoying and worrisome. Could there be something in cylinder 4, or what else could be wrong?
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Old 07-03-2010
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are you getting the right kind?
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Old 07-03-2010
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Yeah i am sure, the truck runs great until that cylinder acts up, then i find the broken spark plug. All of the other cylinders are fine, no damaged plugs. It only seems to occur in the 4th cylinder.
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Old 07-03-2010
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maybe youve gotten faulty parts what kind do you get?
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Old 07-03-2010
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For the spark plugs, I've had Autolite platinum for the past year, but in the most recent change (a month ago) I switched to Bosch Double Platinum, and they seem to work better.

As for engine parts, everything is original.
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Old 07-04-2010
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Interesting. I just replaced my plugs in my 1999 truck, new to me. Before I knew what plugs were in there I bought Autolite iridium. The plugs I replaced were also Autolite. I had a misfire on cylinder 4which promted me to install new wires and plugs. My Ranger has only 65K miles. Hmmm.
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Old 07-04-2010
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I believe one of these days I'll have to pop that cylinder head off and look in there. One of my friends suggested that there might be a piece of insulator in that cylinder, which is hitting the spark plug and destroying it. Not looking forward to that day....
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Old 07-04-2010
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Quote:
Originally Posted by newdirection View Post
Interesting. I just replaced my plugs in my 1999 truck, new to me. Before I knew what plugs were in there I bought Autolite iridium. The plugs I replaced were also Autolite. I had a misfire on cylinder 4which promted me to install new wires and plugs. My Ranger has only 65K miles. Hmmm.
Oh yea, once I replaced the original coil pack all hesitations seemed to go away. Easy four bolt fix.
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Old 07-04-2010
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Originally Posted by newdirection View Post
Oh yea, once I replaced the original coil pack all hesitations seemed to go away. Easy four bolt fix.
As far as I know, the current coil pack is original. Interesting, I might have to try replacing that, my truck seems a lot more sluggish then back in the old 60k mile days.
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Old 07-04-2010
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is your anti freeze low say a gallen every mounth... if so your head is cracked are just need gaskets this is a common problem for the 4.0. i went throught the same thing a few years ago
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Old 07-04-2010
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I had the same problem with my last truck, a constant cyl 4 missfire. About 6 month after it started I noticed my water level getting low and after a year of this problem the motor went bye bye on me. It was two thing according to my mech. Broken lower intake manifold gasket and a cracked head gasket. It much cheaper to have it checked and fixed than the alternitive route that I choose.
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Old 07-11-2010
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check for a cracked head
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