1999-04 Mustang V8 4l Misfiring, Replace Heads Or Not?

Prototype

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Dec 3, 2013

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#1

• Dec 3, 2013

• #1

Hello, people, i Just Joined this Community tonigh 12/03/2013 at 7:40Pm

My problem:
I have a (1999 Stang, V8) (after 3 years with no problems)Stock heads where messed up by Cyl#3 .. I REPLACED heads for semi-new(1,200$ 1 year ago) Before putting heads back, Mechanic ADDED some special HELICOILS that where installed before final installation so that it will have more thread and it will avoid getting another spark plug blown. After installation (1 year later 10/12/2013 ) Cyl# 5 decided to break, I sent it to the shop for Helicoil job... , Today 12/3/2013 Cyl#3 is misfiring, i turn the car on, and i can feel the low compression, i use my OBD2 machine and Cyl#3 is back again after so long..

My Questions:
Can i add STRONGER HEADS with STRONGER SPARK PLUG THREADS to my stang?

Can i add cobra heads to my 99 stang?

Where can i get an upgrade for this FORD HEADS Typical problem?

I live in CA Inland Empire Close to L.A...


Any advise or comment is welcome, negative feedback, just leave it for later.. THANKS in advance

 

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Thatsweetstang

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Nov 4, 2013

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Dec 3, 2013

#2

• Dec 3, 2013

• #2

I think 03-04 gt heads have more threads for the spark plugs. If it's not that bad I think you can fix it yourself, here are some basic how to and the tools to get it done. http://www.timesert.com/html/ford_sparkplug_faq.html
Are you sure it's a stripped spark plug hole? If you are gonna replace heads maybe it's tone to upgrade and get tfs heads or do a 4v swap.

 

Reactions: Prototype

Prototype

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Dec 3, 2013

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Dec 3, 2013

#3

• Dec 3, 2013

• #3

i was looking into that, but would it work in a head that was already using a helicoil.. is it possible to reuse the same hole after being use with a helicoil...

 

Prototype

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Dec 3, 2013

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#4

• Dec 3, 2013

• #4

i will, check the sparkplug tomorrow, and if its loose ill tight it up, but if its stripped a little, i guess its done,

 

Thatsweetstang

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Nov 4, 2013

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Dec 4, 2013

#5

• Dec 4, 2013

• #5

You know the helicoil thing I'm not sure about :/. I've never had a helicoil fail but then again I've never put one in a head. This just may be the perfect excuse to go 4v

 

tank_567

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Mar 19, 2007

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Dec 4, 2013

#6

• Dec 4, 2013

• #6

Thatsweetstang said:

I think 03-04 gt heads have more threads for the spark plugs. If it's not that bad I think you can fix it yourself, here are some basic how to and the tools to get it done. http://www.timesert.com/html/ford_sparkplug_faq.html
Are you sure it's a stripped spark plug hole? If you are gonna replace heads maybe it's tone to upgrade and get tfs heads or do a 4v swap.

Click to expand...

03-04 PI heads are the same from 01-04. The 2005+ crown vic heads are what your looking for, thats when ford added more threads.

 

Mr. Rustypwnz

Advanced Member

Jun 1, 2005

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Dec 4, 2013

#7

• Dec 4, 2013

• #7

tank_567 said:

03-04 PI heads are the same from 01-04. The 2005+ crown vic heads are what your looking for, thats when ford added more threads.

Click to expand...

+1

 

trombonedemon

Well-Known Member

Jun 25, 2009

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U.S.A, U.S.A., U.S.A.!

Dec 7, 2013

#8

• Dec 7, 2013

• #8

There is your problem, you used helicoil. That is used for a cheaper fix until you get timeserts. Changing my sparkplugs my helicoil came out. A few choice words persisted.

 

1987stangman

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Jul 12, 2006

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Dec 10, 2013

#9

• Dec 10, 2013

• #9

Really, the Windsor heads are the most notorious for this. I have several friends over the years that have had the same problem with theirs, two of them bought their cars with the problem and the PO was kind enough not to tell them they had been heilicoiled. I have never seen a Romeo have this issue (didn't know the 05's had updated threads, glad I read that).

+ 1 on using timesert

This is why I when I bought my 2000 I checked each plug before I bought it and so far so good. (knock on wood)

 

madspeed

Colonel Mustard

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Nov 29, 1999

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Dec 10, 2013

#10

• Dec 10, 2013

• #10

@1987stangman, Never heard of this problem with Windsor heads...

 

1987stangman

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Jul 12, 2006

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Dec 10, 2013

#11

• Dec 10, 2013

• #11

If you look at the pic in his first post it's got Windsor heads.

All I can account for is personal experiences.