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Mar 31, 2002 | 03:56 PM

MustangGT221

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Joined: Nov 2001

Posts: 14,947

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From: Topsfield, MA

lose spark plugs

I changed the plugs in my I-6 when i first got it. And i just changed them a year and 1/2 later yesterday at about 10k mi. I've been having bad gas mileage at about 13 and trying to figure otu the problem. When i did, i learned that the number 5 and 6 spark plugs were both loose. #5 was fairly snug, barely finger tight. But #6 was completely loose. Would this have a big influence on my MPG being as low as 13? Its a 300/6 w/ 5 speed 3.55s on 32" tires. Next, i looked at changing my oxygen sensor but i can't get the stock one off, any tips?

Primary rig is:
95' F-150 EB 300/6 5 spd with 4" Superlift, MSD, Ram Air, Gibson Exhaust, 32" BFG Muds
NEW PICS IN MY GALLERY!! :-)

Then theres:
88' F-250 Superduty 351 + c6
92' Thunderbird 3.8L V-6 FOR SALE!
95' Mercury Cougar 4.6L V-8
80' E-350 300/6 and a
3 spd column shifter baby.

The newest addition to the Ford family is a 99' Mustang GT 4.6L

Mar 31, 2002 | 04:39 PM

Pastmaster

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Joined: Jun 1999

Posts: 2,719

Likes: 1

From: Lee's Summit MO

lose spark plugs

Your not getting them tight enough. I'm guilty of that myself, the passenger side plugs arn't easy to get out. They need to be hand tight, and then another 1/2" tighter.

Do you have the tool to remove the sensor? It makes life alot easier with one. Squirt a little WD-40 a couple of days before actually removing it.

'93 F-150 loaded and modified!
Check my Gallery

Apr 2, 2002 | 11:32 AM

GREASYROD

Junior User

Joined: Feb 2002

Posts: 60

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lose spark plugs

The only thing I could suggest would be removing the sensor when the pipe is hot.

Apr 2, 2002 | 11:36 AM

slave2dafords

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Joined: Jan 2002

Posts: 335

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From: LeClaire IA

lose spark plugs

for one yes loose plugs can effect your milage. do you know anyone with a gas axe. heat the collar (threaded ring) to glowing red and slowly turn the sensor reheat as needed. exhaust shop might do it for a small fee.

Apr 2, 2002 | 06:10 PM

MustangGT221

Thread Starter

Post Fiend

Joined: Nov 2001

Posts: 14,947

Likes: 6

From: Topsfield, MA

lose spark plugs

I've got the ol' blue tip wrench, i just didnt know it was okay to get it that hot.

Primary rig is:
95' F-150 EB 300/6 5 spd with 4" Superlift, MSD, Ram Air, Gibson Exhaust, 32" BFG Muds
NEW PICS IN MY GALLERY!! :-)

Then theres:
88' F-250 Superduty 351 + c6
92' Thunderbird 3.8L V-6 FOR SALE!
95' Mercury Cougar 4.6L V-8
80' E-350 300/6 and a
3 spd column shifter baby.

The newest addition to the Ford family is a 99' Mustang GT 4.6L

Apr 3, 2002 | 08:21 PM

slave2dafords

Senior User

Joined: Jan 2002

Posts: 335

Likes: 0

From: LeClaire IA

lose spark plugs

yes if you are replacing the sensor it will not hurt anything to use the torch. i have done plenty of them while i worked at a exhaust shop back in the day..

Apr 5, 2002 | 06:23 AM

jarrod316

Junior User

Joined: Apr 2002

Posts: 75

Likes: 0

From: Port Gibson NY

lose spark plugs

i've encountered the same problem with the spark plugs, my suggestion is the next time you take them out use a thread chaser to clean the threads in the head. then use antisieze on the spark plug threads before you put them back in. This will keep them from rusting in the hole. chasing the threads will insure that the spark plug threads in all the way.