How many miles before you changed spark plugs?
Senior Member
Joined: Sep 2001
Posts: 386
Likes: 0
From: New Hampshire
Battery has one cell failing (down to 10-11v), but still has plenty of current to crank truck in 25 degree weather, Between the battery and plugs (or whatever), it's just getting a bit concerning, sometimes I wonder if it's going to start. But so far, hasn't let me down.
Global Moderator &
Senior Member
Senior Member
Joined: Mar 2005
Posts: 26,080
Likes: 85
From: Burleson/Athens/Brownsboro, TX
What you are not taking into consideration is that other components are under stress to function due to you not doing regular maintenance. The COPs, throttle body, PCM etc. If you maintain the plugs, filters, fluids, and battery, then other parts like PCM, COPS, starter, altenator, transmission, rear end, Trottle body, etc. have a longer life.
__________________
Jim
Jim
Senior Member
Joined: Aug 1999
Posts: 1,506
Likes: 0
From: Bakersfield, CA, USA
Just an FYI, the '99 4.2 does not have COPS.
It has a single coil pack mounted on top of the motor.
FWIW, if you ever change your plug wires or the coil pack, the order on the coil pack does not exactly match the configuration of the cylinders. I think cylinders 5 and 6 are switched. Makes it very easy to get a bad running truck after you change the coil pack or plug wires.
On the battery issue, for the last 15 years or so, whenever I've had one go bad, I get like one day warning before it dies completely. Now, if I ever get a weak crank, I figure I'll be buying a new battery real soon. They just don't seem to gradually go bad like they used to back in the day.
It has a single coil pack mounted on top of the motor.
FWIW, if you ever change your plug wires or the coil pack, the order on the coil pack does not exactly match the configuration of the cylinders. I think cylinders 5 and 6 are switched. Makes it very easy to get a bad running truck after you change the coil pack or plug wires.
On the battery issue, for the last 15 years or so, whenever I've had one go bad, I get like one day warning before it dies completely. Now, if I ever get a weak crank, I figure I'll be buying a new battery real soon. They just don't seem to gradually go bad like they used to back in the day.
Last edited by dirt bike dave; Dec 13, 2011 at 11:04 AM.