99 ranger 4.0 V6 Spark Plug Problem
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Mountain Pass
Joined: May 2004
Posts: 226
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99 ranger 4.0 V6 Spark Plug Problem
My dad has a 99 Ranger V6 4.0l and he is having problems with one of the plugs burning out after he replaces the plug it runs fine but then after a month or so it idles rough and the gas mileage goes down south. What is the cause of this, and what corrective action should be taken
Postmaster
Joined: Jan 2003
Posts: 4,417
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From: Durham, NC
Does the plug look like it is fouling out? If so, the plug wire could be bad. Or,
if it looks burned up, it could be due to a vacuum leak making that cylinder run lean, which makes it run hotter.
if it looks burned up, it could be due to a vacuum leak making that cylinder run lean, which makes it run hotter.
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
I suppose you can never rule out base engine concerns when contemplating the cause of a misfire, and with the 4.0L that could mean a leaky intake (upper and/or lower) gasket or even head gasket. Oil or coolant can make it's way into the cylinder and/or compression could be lost, which would ultimately cause misfires and foul plugs.
If the misfire persists and you run out of things to try, you might consider having a Used Oil Analysis (UOA) done, it could help you determine whether coolant (i.e., sodium, potassium) is mixing in with the oil which would likely identify a gasket problem.
http://www.oilguard.com/Other/OilAnalysisProgram.php
http://www.blackstone-labs.com/gas_engines.html
If the misfire persists and you run out of things to try, you might consider having a Used Oil Analysis (UOA) done, it could help you determine whether coolant (i.e., sodium, potassium) is mixing in with the oil which would likely identify a gasket problem.
http://www.oilguard.com/Other/OilAnalysisProgram.php
http://www.blackstone-labs.com/gas_engines.html
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redranger99
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