1999 Mazda Truck MISS FIRE

1999 MAZDA TRUCK
140,000 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
HUNT
  • MEMBER
  • 2 POSTS
Problem is truck is miss firieing on #3 cylinder, replaced coil plugs and wires and check compression and its good. After replacing coil plugs and wires still shows weak spark on #1,2,3 on the coil pack. Also haveing same troulble on a ford exploder.
Why would it show weak spark on one side of coil pack?
Mar 21, 2008 at 11:26 AM
Advertisement
Avatar
MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
is it actually misfiring? when you say weak spark, what do you mean? does the misfire go away when driving?
Mar 21, 2008 at 12:04 PM
Avatar
HUNT
  • MEMBER
  • 2 POSTS
[quote:9999128796="mastertechtim"]is it actually misfiring? when you say weak spark, what do you mean? does the misfire go away when driving?[/quote:9999128796]

yes its actually misfiring, even when driving it is running rough. took a ignition firing tester that test spark through the wire. and it shows weak spark on the 123 and strong spark on 456.

thanks
jeff
Mar 22, 2008 at 9:43 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.