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Old 03-29-2005, 07:01   #1 (permalink)
Jerry
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What constitutes 'severe duty' to a spark plug - re 98 Ford Club Wagon 5.4L

The service guide for my '98 Ford Club Wagon says that my spark plugs should
be replaced at 100,000 miles.
With 75,000 miles on the van now, I've got mysterious stalling problems when
approaching an intersection; i.e, when decelererating.

I strongly suspect the engine is running lean. The leanness is not
overwhelming, however. There is some pinging, while on the freeway,
especially during the warmer times of the day, that was never evident
before. The timing is OK, according to the OBDII break out.

Nevertheless, it would probably be a good idea to change the spark plugs.
After all, a few misfires, especially as low idle, might cause an engine to
stall. So I looked at my service guide, and sure enough, it says I'm early
if I only have 75K miles. But wait, there is a "severe duty schedule" that
says the plugs should be changed at 60,000 miles.

This van gets a great deal of work on short-haul trips. I have heard that
this is hard on the engine lubricant. Would it wear spark plugs
prematurely? Why? Because they're "cold" much of the time? Does "cold
combustion" age spark plugs at an accelerated rate?

I would especially appreciate any shared experiences on this matter.


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Old 03-29-2005, 09:01   #2 (permalink)
C. E. White
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Re: What constitutes 'severe duty' to a spark plug - re 98 Ford ClubWagon 5.4L

Severe service for a spark plug could be lots of high load
operation (hauling heavy loads, towing, etc.), or lots of
short trip driving that includes a lot of idling. The
mileage guideline are based on an assumed number of engine
hours per mile. Anything that requires more engine hours per
mile driven impacts this.

If you have a stalling problem, I'd suspect the IAC (Idle
Air Control). Depositions can build up on these and affect
there ability to stabilize the idle. They are easily removed
and replaced. Cleaning may be effective (or may not). A new
one is less than $100 at the dealer.

Ed

Jerry wrote:
>
> The service guide for my '98 Ford Club Wagon says that my spark plugs should
> be replaced at 100,000 miles.
> With 75,000 miles on the van now, I've got mysterious stalling problems when
> approaching an intersection; i.e, when decelererating.
>
> I strongly suspect the engine is running lean. The leanness is not
> overwhelming, however. There is some pinging, while on the freeway,
> especially during the warmer times of the day, that was never evident
> before. The timing is OK, according to the OBDII break out.
>
> Nevertheless, it would probably be a good idea to change the spark plugs.
> After all, a few misfires, especially as low idle, might cause an engine to
> stall. So I looked at my service guide, and sure enough, it says I'm early
> if I only have 75K miles. But wait, there is a "severe duty schedule" that
> says the plugs should be changed at 60,000 miles.
>
> This van gets a great deal of work on short-haul trips. I have heard that
> this is hard on the engine lubricant. Would it wear spark plugs
> prematurely? Why? Because they're "cold" much of the time? Does "cold
> combustion" age spark plugs at an accelerated rate?
>
> I would especially appreciate any shared experiences on this matter.

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Old 03-29-2005, 13:01   #3 (permalink)
Jerry
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Re: What constitutes 'severe duty' to a spark plug - re 98 Ford Club Wagon 5.4L

I'll change the plugs, but I don't think they're responsible for my stalling
problem.
I like your idea. I have a CDROM mechanic's manual ('98 Ford) that says the
same thing. However, I can't find the IAC in the manual...or under the
"hood" (which is a nasty place to look for anything). Can you tip me on
where this IAC would be?
The manual says to disable the IAC, and observe a change in idle.
Disablement should adversely affect idle.. And of course it will because my
problem manifests only occasionally

"C. E. White" <cewhite3@nospam.com> wrote

> If you have a stalling problem, I'd suspect the IAC (Idle
> Air Control). Depositions can build up on these and affect
> there ability to stabilize the idle. They are easily removed
> and replaced. Cleaning may be effective (or may not). A new
> one is less than $100 at the dealer.
>
> Ed



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Old 03-29-2005, 14:02   #4 (permalink)
Jerry
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Posts: n/a
Re: What constitutes 'severe duty' to a spark plug - re 98 Ford Club Wagon 5.4L

I'll change the plugs, but I don't think they're responsible for my stalling
problem.
I like your idea. I have a CDROM mechanic's manual ('98 Ford) that says the
same thing. However, I can't find the IAC in the manual...or under the
"hood" (which is a nasty place to look for anything). Can you tip me on
where this IAC would be?
The manual says to disable the IAC, and observe a change in idle.
Disablement should adversely affect idle.. And of course it would because
my
problem manifests only occasionally.

"C. E. White" <cewhite3@nospam.com> wrote
> If you have a stalling problem, I'd suspect the IAC (Idle
> Air Control). Depositions can build up on these and affect
> there ability to stabilize the idle. They are easily removed
> and replaced. Cleaning may be effective (or may not). A new
> one is less than $100 at the dealer.
>
> Ed



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Old 03-29-2005, 16:01   #5 (permalink)
firefox7620@yahoo.com
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Re: What constitutes 'severe duty' to a spark plug - re 98 Ford Club Wagon 5.4L

On Tue, 29 Mar 2005 06:06:17 -0800, "Jerry" <nothanks@x.com> wrote:

>The service guide for my '98 Ford Club Wagon says that my spark plugs should
>be replaced at 100,000 miles.
>With 75,000 miles on the van now, I've got mysterious stalling problems when
>approaching an intersection; i.e, when decelererating.
>
>I strongly suspect the engine is running lean. The leanness is not
>overwhelming, however. There is some pinging, while on the freeway,
>especially during the warmer times of the day, that was never evident
>before. The timing is OK, according to the OBDII break out.
>
>Nevertheless, it would probably be a good idea to change the spark plugs.
>After all, a few misfires, especially as low idle, might cause an engine to
>stall. So I looked at my service guide, and sure enough, it says I'm early
>if I only have 75K miles. But wait, there is a "severe duty schedule" that
>says the plugs should be changed at 60,000 miles.
>
>This van gets a great deal of work on short-haul trips. I have heard that
>this is hard on the engine lubricant. Would it wear spark plugs
>prematurely? Why? Because they're "cold" much of the time? Does "cold
>combustion" age spark plugs at an accelerated rate?
>
>I would especially appreciate any shared experiences on this matter.
>

severe = IE delivery van, police car etc
something someone who does not own it bags on everyday
the average guy is light duty

hurc ast
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Old 03-29-2005, 16:02   #6 (permalink)
firefox7620@yahoo.com
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Re: What constitutes 'severe duty' to a spark plug - re 98 Ford Club Wagon 5.4L

On Tue, 29 Mar 2005 11:47:12 -0800, "Jerry" <nothanks@x.com> wrote:

>I'll change the plugs, but I don't think they're responsible for my stalling
>problem.
>I like your idea. I have a CDROM mechanic's manual ('98 Ford) that says the
>same thing. However, I can't find the IAC in the manual...or under the
>"hood" (which is a nasty place to look for anything). Can you tip me on
>where this IAC would be?
>The manual says to disable the IAC, and observe a change in idle.
>Disablement should adversely affect idle.. And of course it will because my
>problem manifests only occasionally
>
>"C. E. White" <cewhite3@nospam.com> wrote
>
>> If you have a stalling problem, I'd suspect the IAC (Idle
>> Air Control). Depositions can build up on these and affect
>> there ability to stabilize the idle. They are easily removed
>> and replaced. Cleaning may be effective (or may not). A new
>> one is less than $100 at the dealer.
>>
>> Ed

>

lmfao
save your $$$$$$$$$$$$$$$$$$$$$$
buy a good quality throttle body cleaner in spray can
about 10-20 bucks
remove pipe to throttle body
so butterfly is exposed
shoot it through while emgine runs
try to maintain idle as to suck the stuff up the iac passage

hurc ast
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Old 03-30-2005, 08:02   #7 (permalink)
C. E. White
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Posts: n/a
Re: What constitutes 'severe duty' to a spark plug - re 98 Ford Club Wagon 5.4L

The IAC is a shiny chrome looking cylinder about 1.5 inches in diameter with
a flange on one side near the front. It will be attached to the intake
manifold by two screws. There will be an electrical connector on the
opposite end. It is very easy to remove if you can get to it.

Ed

"Jerry" <nothanks@x.com> wrote in message
news:7hi2e.20641$1j7.4905@fe07.lga...
> I'll change the plugs, but I don't think they're responsible for my
> stalling
> problem.
> I like your idea. I have a CDROM mechanic's manual ('98 Ford) that says
> the
> same thing. However, I can't find the IAC in the manual...or under the
> "hood" (which is a nasty place to look for anything). Can you tip me on
> where this IAC would be?
> The manual says to disable the IAC, and observe a change in idle.
> Disablement should adversely affect idle.. And of course it will because
> my
> problem manifests only occasionally
>
> "C. E. White" <cewhite3@nospam.com> wrote
>
>> If you have a stalling problem, I'd suspect the IAC (Idle
>> Air Control). Depositions can build up on these and affect
>> there ability to stabilize the idle. They are easily removed
>> and replaced. Cleaning may be effective (or may not). A new
>> one is less than $100 at the dealer.
>>
>> Ed

>
>



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