Serious Explorations Ford Explorer and Ranger Message Board
#1 Resource for Ford Explorer and Ranger Owners - By Enthusiasts, for Enthusiasts.


Ford Explorer Generation Guide

EF Swag Store 2015 Ford Explorer Forums Elite Membership Chat Room My Posts Reviews Explorer Photo Gallery
Go Back   Ford Explorer and Ranger Forums "Serious Explorations" > Ford Explorer Ranger Repair - Troubleshooting - Modifications & Detailing Forums > Under the Hood

Notices

Under the Hood Ford Explorer and Ranger, Engine, troubleshooting, modifications, performance and accessories.

how to tell if a spark plug is not working?

Reply
 
Thread Tools
Old 05-04-2006, 08:05 PM   #1
JatZilla
Central NJ
'98 4.0L SOHC, 4WD EddieB
 
Join Date: Nov 2001
Posts: 39

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Angry how to tell if a spark plug is not working?

I was able to change only 2 spark plugs on my 98 explorer so i had a local mechanic change the other 4. After 2 days, check engine light came on and the engine started running rough.

how can i diagnose this? how can i determine if one - or more - of the plugs isn't working? side issue...i can't believe how hard a couple of the plugs are, to reach.

TIA
JatZilla is offline   Reply With Quote
( Join the Elite Explorers )

For only $20 per year you can become an Elite Explorer. Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose and fix problems yourself, and learn what modifications really work without having to experiment on your own. Elite Explorer members can change the forum "styles" to see less ads, no green underlined links, and many other benefits such as being able to store 1000 Private Messages, upload photo attachments directly to your posts and more. Join the Elite Explorers today.


Old 05-04-2006, 08:19 PM   #2
ajr2000
Trumbull, CT
 
ajr2000's Avatar
93 XLT
 
Join Date: Mar 2006
Posts: 184

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What I used to do on lawnmowers was take the plug out connected to the wire and just ground the plug to the engine, but outside of the engine so you can see it. Just be careful that you don't screw up the gap.
ajr2000 is offline   Reply With Quote
Old 05-05-2006, 09:03 AM   #3
budwich
Ottawa, Ont
96 XL
 
Join Date: May 2005
Posts: 3,246

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
if its not working.... typically when you pull the plug, it will be wet meaning that the gas is not being burnt. You can check the wiring / plug as suggested. If you have an induction timing light, clip the light on the "suspect lead", if it triggers, that will tell that the spark "signal" was at least sent.... and should have made it to the plug assuming there aren't breaks in the wire, poor connnect at the cap snap on, or cracks in the plug.

Ultimately, get the codes read, they will help you eliminate a lot of stuff quickly.
budwich is offline   Reply With Quote
Old 05-05-2006, 09:05 AM   #4
JatZilla
Central NJ
'98 4.0L SOHC, 4WD EddieB
 
Join Date: Nov 2001
Posts: 39

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Quote:
Originally Posted by ajr2000
What I used to do on lawnmowers was take the plug out connected to the wire and just ground the plug to the engine, but outside of the engine so you can see it. Just be careful that you don't screw up the gap.
just so i get this right...touch the outside of the plug to some part of the engine, then crank the starter to see if it sparks?
JatZilla is offline   Reply With Quote
Old 05-05-2006, 01:28 PM   #5
DCExplorer
Accokeek MD
98 EB
 
Join Date: Dec 2004
Posts: 149

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Another trick is to simply pull each plugwire one at time. I you pull off a plugwire and the truck runs worse, chances are the plug is firing. However, if you can find a plugwire where the truck runs exactly the same whether it is attached or not, then that cylinder is likely the one giving you a problem.




__________________
1998, 5.0L V8 (302 c.i.), All-wheel Drive (AWD), Eddie Bauer
Hidden Hitch class III, Rancho 9000 shocks, PowerSlot Rotors, Hawk Pads
DCExplorer is offline   Reply With Quote
Old 05-05-2006, 01:48 PM   #6
MrShorty
Spanish Fork, UT
92 XLT and '87 Bronco II
 
Join Date: Dec 2001
Posts: 4,976

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
After 2 days, check engine light came on and the engine started running rough.
1st thing I would do would be to pull the codes from the computer. EEC-V can identify misfires, often can pinpoint which cylinder(s), and otherwise give you a good place to start.




__________________
Mr. Shorty
92 XLT 4x4
87 Bronco II XLT 4x4
'98 Chev K1500 Suburban SLT 4x4
MrShorty is offline   Reply With Quote
Reply

Suggest this thread to friends:



Join the "Elite Explorers" Today!



Search Explorer Forum


Top of Page

Thread Tools

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

Forum Jump


All times are GMT -5. The time now is 10:44 PM.



US Flag
We Support Our Troops!

Explore the site!


Copyright 2014 - 1996 Rick Horwitz Photography



Ford Motor Company is not involved in the management of this site in any way.



All tips on this site are for use at your own risk and discretion.

Modifying the suspension on any vehicle will cause changes to its handling characteristics.



Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.