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From: jim beam <m...@privacy.net>
Newsgroups: rec.autos.makers.ford.explorer,rec.autos.tech,rec.autos.driving
Subject: Re: spark plug question
Date: Fri, 22 Jun 2012 21:05:31 -0700
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On 06/22/2012 04:09 PM, Ashton Crusher wrote:
> On Mon, 14 May 2012 17:12:18 -0700, Ashton Crusher<j...@here.net>
> wrote:
>
>> I would appreciate any thoughts on what, if anything, these plugs are
>> saying... lean, rich, too hot, too cold, whatever.
>>
>>
>> http://img856.imageshack.us/img856/1732/imag01561.jpg
>>
>>
>> they are from a 92 explorer with a low rpm miss.  It scopes out fine
>> yet misses.  Replacing these plugs seems to "fix" it for about 5000
>> miles.  Searching the net suggests the problem is that the fuel
>> injectors are going bad and running too lean but not lean enough to
>> set a code.  No codes have popped up.  Over 2000 rpm it runs smooth
>> right up to redline in any gear.
>
>
> Update on this....  Got home so it's 4000 miles later.  In the first
> 50 miles of the return trip it started missing again and I almost
> turned back.  It was raining most of that 50 miles.

if you can't connect rain with an indication of an issue with the 
ignition system, then the problem is in the passenger compartment, not 
the engine compartment.


> Slogged on
> another 10 miles to the Interstate Service Area with it seeming to
> come and go.  Check engine light flashed on and off and on and off
> several times and then stayed on.

but you didn't bother to pull the code, just like you can't be bothered 
to report what it is...


> Got to the Service area and shut it
> off, opened the hood and poked around looking for wetness but
> everything seemed dry.

of course - humidity is always irrelevant if something's not actually 
soaking wet.


> Started it back up and the light was off and
> it ran fine.

after the warmth of the engine had dried it out...


> Ran fine for the rest of the trip, 4000 miles. Yesterday
> I drove it quite a bit and no problems and when I got home I left it
> on and got my infrared heat measuring gun and measured the exhaust
> manifold by the three cylinders on the side I replaced the plugs.
> Front cyl was about 450 degrees, second cyl 550 and third cyl 550.  So
> that's making me think it may be related to those fuel injectors
> running too lean as was suggested by the web post I found.

and ignoring all the other usenet posts that disagree...


> Anyone know
> what the "normal" temp is when getting a manifold temp reading like
> this??  Averaged 20.5 mpg for the trip.

it's not the temperature, it's the /difference/ in temperature.


bottom line, if you want to go ahead and change the injectors, then go 
ahead and do it.  just don't keep bothering us about it - especially 
since you don't want to analyze what these symptoms indicate, and you're 
clearly not prepared to listen to anyone else who does.


-- 
fact check required