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post #1 of (permalink) Old 10-13-2003, 05:25 PM Thread Starter
 
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Spark Plug wires

How often should you replace your plug wires? This is my daily driver, about 125 miles a week, mostly freeway. I have the Mopar MPI on my 258. I'm sure it's due, but I'm just wondering for future reference.
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post #2 of (permalink) Old 10-13-2003, 08:48 PM
 
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Re: Spark Plug wires

Haynes says to "inspect" them every 30K or 24 months, along with cap & rotor. You're looking for anything that obviously shouldn't be there (physical damage, etc), as well as corrosion on the connections...Also, check the resistance of the wires...should be in the neighbourhood of X ohms/foot of wire, though i can't remember what X should be...if yours are old and you're doing a major tuneup, i'd put new ones in anyway...
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post #3 of (permalink) Old 10-14-2003, 02:01 PM Thread Starter
 
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Re: Spark Plug wires

Thanks, I figured they were due since I think the wires are the ones that came with the MPI conversion kit. Do the "high performance" wires make any difference or do they just cost more?
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post #4 of (permalink) Old 10-14-2003, 02:15 PM
 
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Re: Spark Plug wires

The "high performance" wires are usually larger (like 8mm) or offer lower resistance values and usually both.

The theory is that with a larger conductor and less resistance, you'll get more energy to the spark plugs.
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post #5 of (permalink) Old 10-14-2003, 02:26 PM
 
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Re: Spark Plug wires

I went with the Bosch premium wires when I did the TR upgrade. Unfortunately, I did the MC2100 swap at the same time, then went to visit the out-laws for thanksgiving last week, and haven't finished the throttle bracket, so i can't really tell if they make any difference. But i figured that if i was spending about $150 on an upgrade, why cheap out on the wires to save $10-15? For the small additional cost, they can't do any harm.
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post #6 of (permalink) Old 10-21-2003, 03:36 PM
Dex
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Re: Spark Plug wires

i just got my cj5 back home, from total rebuild and wires end to end thanks to DAD , its 350 chevy built , 69 block and 70 double hump heads, 500 cfm 2 brl, does anyone know the right plug i need ? its changed over to MSD HEI distributor,i like to have AUTOLITE'S , but im fouling the AC's thats in engine now, '70 gap is .035 but im thinking i need bigger gap plug and hotter range??? dont hei need .045 - .060 gap on a chevy?
the foul is comming from plugs.
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