Volvo AWD 850 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 12/2011 850 INDEX

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Changing spark plug wires? 850 1997

OK....checked a spare set of wires and found that they varied from 2500 ohms to 4200 ohms depending on the length. Short ones were lower, longer ones higher in resistance, but nothing like "zero" ohms like you'd get with a piece of copper wire.

Then I took a look at the website for Bougicord (should have done this first) and found in their FAQ list the following:
"Since 1957, the law has required that all automobile ignition wire sets be fitted with interference suppressors. Standards place acceptable resistance at 5,600 ohms per metre of cable with a tolerance of ± 20% (the range is therefore between 4,480 and 6,720 ohm/m). At that time, interference suppression was made compulsory to avoid disturbing radios or televisions in areas where the vehicle was running. The phenomenon was troublesome but not dangerous. Today, interference may accidentally set off an airbag, or perturb an ABS braking system. Hence the need for using ignition wire sets that correspond to interference suppression standards perfectly."

Hmmmmm.....so at 5600 ohms per meter, the number one cylinder wire is almost exactly on spec coming in at 4200 ohms since it's about .75 meter in length and the number 5 cylinder wire at only about 8 inches length is also right on with 2400 ohms.

Next step--pull apart the set on my engine to check it.....






THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD

New Changing spark plug wires? [850][1997]
posted by  bruland3  on Sat Feb 14 10:01 CST 2009 >


<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.