4.0L missing
Elder User
Joined: Dec 2006
Posts: 830
Likes: 0
From: Kitchener,Ontario,Canada
Originally Posted by B-Aerostar
The shorted plugs were #3 and #6 again. They look good and I tryed checking them with a ohm meter. They have about 6000 ohms, and the old have only 3500 - 4000 ohms.
You also said plugs #3 & 6 AGAIN, so root cause probably has nothing to do with the plugs ?
Last edited by Aeroman59; Apr 10, 2007 at 11:10 AM. Reason: update
Senior User
Joined: Apr 2004
Posts: 312
Likes: 0
From: Lanham,MD
I didn't think that was a short either but they wont fire when I reinstall them. The wires are new, switch from Beldon 8mm wire to Autolite Professional Series. Its just for what ever the reason the plugs foul up on the number 3 and 6. I use Mobile 1 oil, Seaform gas additive and Motorcraft and Autolite plugs only. Test ever thing with a Breakout box. The resistance for the injector was off by .1
4.0 -5.5 ohms listed I got 5.6 ohms on both banks.
4.0 -5.5 ohms listed I got 5.6 ohms on both banks.
Last edited by B-Aerostar; Apr 10, 2007 at 09:00 PM.
Lead Driver
Joined: Sep 2003
Posts: 7,016
Likes: 208
From: SoCal
Do other plugs that you install into those cylinders get fouled as well? If so, maybe it's time to run compression checks on the engine. Repeated fouling of the plugs means that something in those cylinders, like water or oil, may be getting onto the plugs.
