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  #1  
Old 01-14-2011, 09:01 AM
Cdy291 Cdy291 is offline
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Default Spark plug wear

So when spark plugs wear out the gap in them opens up bigger, right? I was just wondering because back in the summer when I replaced the ones in this one all the gaps where around .08- .085, supposed to be .042- .046. Needless to say it had not had proper care before I got a hold of it.
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Old 01-14-2011, 09:58 AM
terryduanemiller terryduanemiller is offline
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Default Re: Spark plug wear

some plugs wear, depends on maker... I went to autolites they seem to last longer, than what was recommended, the centre electrode and ground electrode wld dissipate/wear creating a larger gap.... some plugs wear from running lean..
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Old 06-05-2011, 04:28 AM
fivestring fivestring is offline
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Default Re: Spark plug wear

I experienced the same thing yesterday. All 8 plugs had a .080+ gap. I put new Autolites in, gapped at .045.

Strange thing is, the truck seemed to run fine with the gap that large. I just bought the truck last month and am going over everything.

And did the original wires have the year and cyl number printed on them? I think I just replaced original 1996 wires. Haven't drove it yet but I'm hoping performance and mpg (20.4 on first tank) will improve.

Seeing those plugs worn down that far and maybe oe wires, I am now going to install a new timing belt.

Last edited by fivestring; 06-05-2011 at 04:31 AM.
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Old 06-05-2011, 05:37 AM
STL STL is offline
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Default Re: Spark plug wear

Did the truck run crappy before?
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Old 06-06-2011, 07:26 AM
fivestring fivestring is offline
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Default Re: Spark plug wear

No. Just tuning up and making everything fresh on a newly acquired ride. I am trying to improve a currently 20mpg 4cyl/5speed/2wd truck for an economical ride to work. 160k miles.

I was surprised to see the huge gap on these worn plugs. And it started and ran 'normal' but I don't have anything to compare 'normal' to. The guy I bought the truck from had 2 Rangers and said the other one ran much better than this one.

No missing, no hesitation, easy starting and idling. And after a trip to work yesterday, there doesn't seem to be any difference in performance after new plugs and wires.

So far I have replaced:
Tires
Shocks
Plugs
Plug wires
Rear brake pads and hardware
tran fluid
diff fluid
engine oil and filter
fan belt

Cleaned throttle body (lot of oil deposits in there)
checked air filter (looked new)

Still need:
fuel filter
timing belt (?)

I'm concerned about the diff. While changing the fluid I noticed it has a fair amount of slop in the spider gears and makes a clunk when you let off and apply throttle and I think it is making some humming noise while driving.

Any thing else I should consider for best fuel economy?
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Old 06-06-2011, 09:09 AM
Fordzilla80 Fordzilla80 is offline
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Default Re: Spark plug wear

Just found out my plugs are at .70, and only after 50,000 miles.

My truck definitely is not running right. It has always idled a little rough since I bought it, and I knew i'd have to change the plugs eventually. But I never realized the gap was so bad. My problems currently are low idle, stumbly idle, hesitation upon acceleration, and stumbling under load. Gonna definitely get around to replacing the plugs.
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Old 06-06-2011, 09:37 AM
FireRanger FireRanger is offline
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Default Re: Spark plug wear

What your describing is also symptomatic of a fuel pump, fuel filter, or fuel pressure issue too. So if the plugs don't fix it....
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  #8  
Old 06-06-2011, 11:08 AM
Fordzilla80 Fordzilla80 is offline
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Default Re: Spark plug wear

Quote:
Originally Posted by FireRanger View Post
What your describing is also symptomatic of a fuel pump, fuel filter, or fuel pressure issue too. So if the plugs don't fix it....
Yea....

But at 50,000 better not be the fuel pump. But I wouldn't imagine it'd be something fuel related, because the plug wear was normal except for the enlarged gap. There was no sign on the plugs of the truck running lean or anything, and doesn't really act in my opinion like it's starving for fuel. Once I get going it seems to be just fine.

Last edited by Fordzilla80; 06-06-2011 at 11:13 AM.
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