Plug wires - Page 3 - Fuelly Forums

Click here to see important news regarding the aCar App

Thread Tools Display Modes
Old 06-05-2006, 03:16 PM   #21
Registered Member
95metro's Avatar
Join Date: May 2006
Posts: 498
Country: United States
zpiloto - I was just looking at your post again and you've had those wires in for 30,000 miles? It doesn't seem like the wires have degraded in the slightest (though I don't know what they started at).

Like I mentioned before, I've wondered if wires actually need to be replaced as often as a lot of people say (I've heard many say every year or every other tune-up). Seems like a rather large expense for a few less ohms of resistance when the vehicle can actually run fine with high-resistance wires.

From Bosch's site:

Any time a wire exhibits physical damage either to the wire or the boots, such as a cut, grooves or marks from chafing or scorch marks from burning, the wire should be replaced as preventative maintenance.

Additionally, some wires fail from the inside, due to a breakdown of their insulation materials. Wires should always be inspected and tested whenever a rough or erratic idle is present, poor acceleration is noticed, a decrease in fuel mileage is experienced or a vehicle fails an emissions test due to high hydrocarbon emissions or cylinder misfire fault code.

Wires should be replaced if their resistance exceeds the OEM specifications for their specific application. Wires should always be replaced as a set due to the unpredictability of the internal condition of each individual wire.

95metro is offline   Reply With Quote
Old 06-05-2006, 04:47 PM   #22
Registered Member
zpiloto's Avatar
Join Date: Mar 2006
Posts: 1,225
Country: United States
Thanks. I agree these were changed at 70k and probably did not need to. But Now that I have a handy dandy multi meter so I'll just check em every 30k or so.

zpiloto is offline   Reply With Quote
Old 06-05-2006, 05:15 PM   #23
Registered Member
95metro's Avatar
Join Date: May 2006
Posts: 498
Country: United States
Your test got me curious so I checked my wires finally. I didn't measure lengths 100% accurately - just a rough measure.

Cylinder 1: 3876 ohms/ft
Cylinder 2: 4368 ohms/ft
Cylinder 3: 4248 ohms/ft

Just realized I didn't check the coil to distributor wire...oh well.

The Haynes manual states that wire resistance should be <10kOhms/ft.

These wires are minimum 9 months old - have no idea when they were changed - Niehoff premium silicone.

95metro is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
US / metric switching problems gory Fuelly Web Support and Community News 4 01-24-2011 02:04 AM
List of Fuel Efficient Cars kickflipjr General Fuel Topics 15 06-13-2010 11:26 AM
Tracking Monthly Fuel Expense Taser Fuelly Web Support and Community News 2 11-09-2009 11:40 PM
TDI EPA figures off? bates General Fuel Topics 14 09-15-2009 08:04 AM
How to check spark plug wires. CruiseControl General Fuel Topics 3 12-23-2005 10:54 PM

» Fuelly Android Apps
Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 02:39 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.