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#1001600 - 08/10/06 04:54 PM Spark plug gap tool
2001Crown_Vic Offline
Stranger

Registered: 08/04/06
Posts: 6
I just bought a set of new motorcraft AGSF32PM sparkplugs. My 2001 Crown Vic they calls for 0.052"-0.056" gap. However my wire gauge does not have these values on it. Who has any sugestions for a tool that has 0.054" or so on it?

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#1001601 - 08/10/06 10:39 PM Re: Spark plug gap tool
BMFer Offline
I'm your huckleberry
Grand Poobah

Registered: 12/04/05
Posts: 13583
Loc: 30106
_________________________

'13 Coyote 5.0

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#1001602 - 08/10/06 10:41 PM Re: Spark plug gap tool
BMFer Offline
I'm your huckleberry
Grand Poobah

Registered: 12/04/05
Posts: 13583
Loc: 30106
_________________________

'13 Coyote 5.0

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#1001603 - 08/11/06 04:42 AM Re: Spark plug gap tool
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4344
Loc: Socialist State of MN
buy a gapper at auto zone, they are $1.29, about the size of a silver dollar.
_________________________
-Carl
1997 Crown Victoria p71, garage queen. 135,000 miles.
MZT, T-45, ENS bushings, IAS shocks, magnaflow cat pipes, Truetrac, 02 brakes, 99 TC rims, 97 TC seats, Mark VIII fan.

1987 Mercedes-Benz 300D Turbo. Winter car. 139hp of slow. 227k when the odometer broke long ago. Runs, shifts, drives, doesn't rust.

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#1001604 - 08/11/06 08:11 AM Re: Spark plug gap tool
BMFer Offline
I'm your huckleberry
Grand Poobah

Registered: 12/04/05
Posts: 13583
Loc: 30106
They are also inaccurate wedge type gappers.
_________________________

'13 Coyote 5.0

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#1001605 - 08/11/06 09:17 PM Re: Spark plug gap tool
Hangfire Offline
Member

Registered: 09/20/04
Posts: 213
Loc: Los Angeles
Snap on has my vote, why screw around?
_________________________

1999 P-71
New AL intake!

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#1001606 - 09/19/06 07:07 PM Re: Spark plug gap tool
TheEnginerd Offline
Member

Registered: 05/02/03
Posts: 249
Loc: TX
I'm gap mine by eye. I'm just that good.



Standard feeler gauge is what I have laying around for this task.
_________________________
[--98 Crown Vic--]
->MM Airbox/MAF
->'04 Zip Tube and Ported Plenum
->10.5 CR
->3.55 FD w/ Detroit Tru-Trac
->11" (11.25"?) Mustang TC
->DR Tuned

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#1001607 - 10/10/06 10:32 PM Re: Spark plug gap tool
dkcase Offline
Rookie

Registered: 01/19/03
Posts: 65
Loc: Illinois
Quote:

They are also inaccurate wedge type gappers.



I wondered why you had concluded this. I finally got around to checking the gapper I use with a calipers.
It's not inaccurate. I'll keep using it.

They always say you should gap plugs with a wire, not flat feeler gauges, but I don't think it matters that much.

The other gapper I have is the pliers type that squeezes the terminal to the proper gap.

[image][/image]

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#1001608 - 10/11/06 08:21 AM Re: Spark plug gap tool
BMFer Offline
I'm your huckleberry
Grand Poobah

Registered: 12/04/05
Posts: 13583
Loc: 30106
Quote:

I wondered why you had concluded this.




Years of experience. Most are inaccurate. The soft metal they are made of also wears quite easily, making them even more inaccurate.

Quote:

I finally got around to checking the gapper I use with a calipers.
It's not inaccurate.




Rare.

Quote:

I'll keep using it.




As you have the right to do. Or you could spend $6 or $8 on a quality wire type gapping tool.
_________________________

'13 Coyote 5.0

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#1001609 - 10/11/06 12:01 PM Re: Spark plug gap tool
pachesma Offline
Rookie

Registered: 10/19/05
Posts: 82
Loc: Hull Ma
Boys and Girls,

first, I can't BELIEVE none of you "experts" know this, there is a VERY specific reason why you ONLY use wire type spark plug gapping tools, and its very simple- to PROPERLY set the gap.

ONLY PLACE you want to measure the gap is between the center electrode and the ground electrode, and the ONLY THING that will do this is a ROUND wire of a very specific diameter.

The ONLY part of the electrode(s) you want the gapping tool to interfere with, and thereby measure the physical gap, is the area DIRECTLY between the electrodes, a FLAT wedge type or flat "feeler" gauge WON'T DO THAT.

Also look CLOSELY at how the ground electrode and center electrode are manufactured. MONEY BET at least one of 'em ain't flat. MIGHT even be a little round "saddle" in the ground electrode. Might be tapered, might be angled. Some plugs center electrode is rounded on the bottom, somes flat, some even got a little groove in 'em

And YA CAN'T set none of them accurately with a flat or wedge type gauge. Even if both electrodes are flat ya still can't set 'em right with a flat gauge, ya need a wire that will ONLY touch that part of both electrodes
And the ONLY way to adjust the gap is with the proper tool on the ground electrode(gap too small) or LIGHTLY tapping of the ground electrode on a clean smooth metal surface(gap too big).

They ain't gapped right you just changed the heat range. They ain't gapped right you just changed the arc characteristics, which in turn changes the flame propagation in the combustion chamber, which in turn modifys the performance of that spark plug.

Ya gap yer plugs with one of them wedge gappers or a flat feeler ya more than likely got 8(in this case) plugs running 8 different heat ranges. And 8 different combustion chambers performing at 8 different levels.

Ya ever seen on TV, or actually been at a race(especially drag racin), after a run they'll take the plugs outa the car and look at 'em with one of those eyeglasses a jeweler uses?? Its called a LOUP, and their looking to see the burn characteristics showin up on the plugs, and thats 100% effected by the gap.

And I got a loup, and a set of wire feeler gauges, and I use 'em both when I'm doing plug changes.

And NEVER,EVER,EVER just take a plug outa the box and slap it in.

This Auto Mechanics 101 folks. Ya can spend thousands of dollars slapping all kinds of cams, pistons, crankshafts , bigger injectors, high end fancy hi-po electronic gizmos on yer engine to go faster and produce more HP, ya don't do basic mechanics stuff like this properly you've probably just pissed away all that money,and probably stand a better than 50/50 chance of trashing what ya got.

I been doing this crap since before I got my drivers license; and I got my drivers license in 1971, and I STILL look at every plug that comes outa my car with a loup, and gap every plug with a wire feeler gauge-JRC
_________________________
1996 GM 90K
2000 GM 46K

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#1001610 - 10/11/06 10:14 PM Re: Spark plug gap tool
dkcase Offline
Rookie

Registered: 01/19/03
Posts: 65
Loc: Illinois
So I should use one of these old ones ....

[image][/image]

By the way Professor, I think it's a loupe .

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#1001611 - 10/12/06 05:35 AM Re: Spark plug gap tool
pachesma Offline
Rookie

Registered: 10/19/05
Posts: 82
Loc: Hull Ma
Its spelled either way brain surgeon. Personally, YOU can use anything ya want, doesn't affect the performance of my vehicles in the least. That comes under the heading of doing it the right way, or doing it every other way its done-JRC
_________________________
1996 GM 90K
2000 GM 46K

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#1001612 - 10/13/06 01:25 PM Re: Spark plug gap tool
BillB Offline
Member

Registered: 10/11/06
Posts: 142
Loc: Revere MA
I agree round wire gauges best
I did not realize all effects on heat range and flame
propagation.

So how do you tell whats going during combustion?
I been reading the books and pictures for years but still
not certain of alot.

When looking at the plugs what if one center electrode is brown others are more gray or white, what does that mean.

dont rear cylinders run hotter than front, etc.

is black around edges always no good or just normal for mostly city driving.

I have always wire-brushed scraped deposits off, bent up the GND electrode and filed flat both CTR and GND electrodes
is this practice not good.

How often need to check and regap?

Why replace if plugs seem to be normal looking??



_________________________
87F CV P73
91 Merc GM

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#1001613 - 10/18/06 09:46 PM Re: Spark plug gap tool
CVPI03 Offline
Member

Registered: 12/10/05
Posts: 279
Loc: TN
Flat, wedge type gappers are garbage. If you want to accurately gap your spark plugs, you will need a round wire type gapper.
_________________________
2003 CVPI all stock
3.27 TracLok

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