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Old 04-21-2005, 02:01   #1 (permalink)
fish via CarKB.com
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1998 explorer 4.0 sohc

My spark plugs have black powder on them, I was told either ruuning to rich
or something in ignition system, has alot of hesitation, and cappy gas
milage. What does the ignition system include? Thanks
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Old 04-21-2005, 18:01   #2 (permalink)
Jim Warman
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Re: 1998 explorer 4.0 sohc

Ignition system includes plugs, wires and coils n the secondary side.... ICM
and PCM on the primary side. My first inclination would be to fuel system
faults for what you describe but, there's not much info to go on..... Miles
on the car, how long since last tune/air filter/fuel fiilter and so on? Is
the CEL on, even if it's not, are there any codes? Where are the fuel trims
sitting? Are there any other running symptoms besides bad mileage?

"fish via CarKB.com" <forum@nospam.CarKB.com> wrote in message
news:e5f09ddb334c4d15abe25fee4052d2f6@CarKB.com...
> My spark plugs have black powder on them, I was told either ruuning to

rich
> or something in ignition system, has alot of hesitation, and cappy gas
> milage. What does the ignition system include? Thanks



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Old 04-22-2005, 09:01   #3 (permalink)
fish via CarKB.com
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Re: 1998 explorer 4.0 sohc

Hey Jim,It was remanufactured about 1000 miles ago, it has run rough since
then.I had one side or the catalytic converter replaced, think the otger
side needs replacing also. At the shpo where replaced the cat converter,
they scanned it and showed mass air flow sensor. I f replaced it, and then
it showed codes oxegine sensors 1 side to rich the other side to lean. Had
sensors replaced when they redid motor.I don't know if wires or coil have
ever been replaced. It had 129000 miles when motor in was replaced. The
hydrolic tensoners were bad. But it was running a little like this before
motor was replaced. Now it hesitates, and runs rough at idle, you have to
really push on gas to get it going. any help would be appreciated.

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Old 04-24-2005, 01:01   #4 (permalink)
Jim Warman
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Re: 1998 explorer 4.0 sohc

If this stuff has surfaced since the mtor replacement, I would first go over
any and all connections between motor and chassis. It's amazing what a bad
ground or improperly assigned vacuum line can do. If your shop is struggling
with their diagnosis, it may be time to find a different shop....

"fish via CarKB.com" <forum@CarKB.com> wrote in message
news:40442b7c9a1f431b971bef6fe43ebf40@CarKB.com...
> Hey Jim,It was remanufactured about 1000 miles ago, it has run rough since
> then.I had one side or the catalytic converter replaced, think the otger
> side needs replacing also. At the shpo where replaced the cat converter,
> they scanned it and showed mass air flow sensor. I f replaced it, and then
> it showed codes oxegine sensors 1 side to rich the other side to lean. Had
> sensors replaced when they redid motor.I don't know if wires or coil have
> ever been replaced. It had 129000 miles when motor in was replaced. The
> hydrolic tensoners were bad. But it was running a little like this before
> motor was replaced. Now it hesitates, and runs rough at idle, you have to
> really push on gas to get it going. any help would be appreciated.
>
> --
> Message posted via http://www.carkb.com



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