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Old 12-12-2005, 16:01   #1 (permalink)
pedal tothe metal
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ford ranger rough idle p0301 and p0171

It got very cold (below freezing) a few days ago (texas). The next
day, quit suddenly, the idle became very rough - but no stalling. The
next day the check engine light comes on (it was about time, LOL).
Also, the rough idle doesn't seem to improve with temperature / warm
up. Engine smooths out at higher rpms but is rough under load / high
torque (low rpm) conditions.

Autozone says two codes: P0301 cyl 1 misfire detected, and P0171
system too lean bank 1.

I'm thinking a clogged fuel injector as the common denominator from
those codes. Does that sound right? Is it possible that some water /
ice entered the fuel system somehow and clogged the injector?

Vehicle is '98 ford ranger, 3.0 L, 97K miles.

Thanks...


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Old 12-12-2005, 18:01   #2 (permalink)
Ron and Diane
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Re: ford ranger rough idle p0301 and p0171

Could be wet ignition wires or a bad distributor cap?


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Old 12-12-2005, 21:01   #3 (permalink)
johanb
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Re: ford ranger rough idle p0301 and p0171

I would start with new cables and plugs and check for vacuum leak



"pedal tothe metal" <pedaltothemetal@mail.org> wrote in message
news:a52sp1l9t05kqku3l58akgrbjnkjhuigo0@4ax.com...
> It got very cold (below freezing) a few days ago (texas). The next
> day, quit suddenly, the idle became very rough - but no stalling. The
> next day the check engine light comes on (it was about time, LOL).
> Also, the rough idle doesn't seem to improve with temperature / warm
> up. Engine smooths out at higher rpms but is rough under load / high
> torque (low rpm) conditions.
>
> Autozone says two codes: P0301 cyl 1 misfire detected, and P0171
> system too lean bank 1.
>
> I'm thinking a clogged fuel injector as the common denominator from
> those codes. Does that sound right? Is it possible that some water /
> ice entered the fuel system somehow and clogged the injector?
>
> Vehicle is '98 ford ranger, 3.0 L, 97K miles.
>
> Thanks...
>
>



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Old 12-14-2005, 15:01   #4 (permalink)
pedal tothe metal
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Re: ford ranger rough idle p0301 and p0171

I replaced number one spark plug (looked good) no idle change - still
rough as cobb. The resistance of that wire is 8500 ohms and the spec
is 7000 ohms per foot. Right about at the spec threshold. Seems like
it would have to be much higher resistance to have such a rough idle.

I listened for vacuum leaks but nothing obvious. Is there an easy
vacuum test for these symptoms ?

I've heard of using a stethoscope to listen to the fuel injectors
(going back to my original thought). Some have recommended listening
with a long screwdriver but the engine is rocking so much I don't see
how I can do that.

Thanks...


On Mon, 12 Dec 2005 21:50:23 -0700, "johanb"
<ollieb1oREMOVE@THIScs.com> wrote:

>I would start with new cables and plugs and check for vacuum leak
>



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Old 12-14-2005, 18:01   #5 (permalink)
johanb
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Re: ford ranger rough idle p0301 and p0171

Your kidding right ???????/

What about the other 5 cylinders !!!!!!!!!!!!!!!!

Only 1 has to be bad to cause a rough idle.



Good luck



"pedal tothe metal" <pedaltothemetal@mail.org> wrote in message
news:3h71q1p6a95tm6sunaqhdv7d67pq20j86f@4ax.com...
> I replaced number one spark plug (looked good) no idle change - still
> rough as cobb. The resistance of that wire is 8500 ohms and the spec
> is 7000 ohms per foot. Right about at the spec threshold. Seems like
> it would have to be much higher resistance to have such a rough idle.
>
> I listened for vacuum leaks but nothing obvious. Is there an easy
> vacuum test for these symptoms ?
>
> I've heard of using a stethoscope to listen to the fuel injectors
> (going back to my original thought). Some have recommended listening
> with a long screwdriver but the engine is rocking so much I don't see
> how I can do that.
>
> Thanks...
>
>
> On Mon, 12 Dec 2005 21:50:23 -0700, "johanb"
> <ollieb1oREMOVE@THIScs.com> wrote:
>
> >I would start with new cables and plugs and check for vacuum leak
> >

>
>



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Old 12-15-2005, 09:01   #6 (permalink)
gw
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Posts: n/a
Re: ford ranger rough idle p0301 and p0171

Did you run it with the plug out to see if #1 is sparking? If it's not, I
would suspect the coil pack.

If you had ice in an injector, it wouldn't last long after warmup. Instead
of a screwdriver you can use a length of garden hose to listen to the
injector.

"pedal tothe metal" <pedaltothemetal@mail.org> wrote in message
news:3h71q1p6a95tm6sunaqhdv7d67pq20j86f@4ax.com...
>I replaced number one spark plug (looked good) no idle change - still
> rough as cobb. The resistance of that wire is 8500 ohms and the spec
> is 7000 ohms per foot. Right about at the spec threshold. Seems like
> it would have to be much higher resistance to have such a rough idle.
>
> I listened for vacuum leaks but nothing obvious. Is there an easy
> vacuum test for these symptoms ?
>
> I've heard of using a stethoscope to listen to the fuel injectors
> (going back to my original thought). Some have recommended listening
> with a long screwdriver but the engine is rocking so much I don't see
> how I can do that.
>
> Thanks...
>
>
> On Mon, 12 Dec 2005 21:50:23 -0700, "johanb"
> <ollieb1oREMOVE@THIScs.com> wrote:
>
>>I would start with new cables and plugs and check for vacuum leak
>>

>
>



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Old 12-15-2005, 18:01   #7 (permalink)
pedal tothe metal
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Posts: n/a
Re: ford ranger rough idle p0301 and p0171

No, not kidding. You may have overlooked in my first post. The
problem came on suddenly. It was and had been running fine and then
all of the sudden it's as rough as a cobb.

This is bizarre. I can't believe this. Some one flipped the "switch"
back. Today while driving home, it's back to purring like a kitten.
Not the slightest roughness to it. The only thing I've done is
replaced plug one - and the old plug was good. Didn't raise the hood
today even.

I'm thinking it's one of the following:

1) Whatever was clogging the injector(s) has now passed

2) Number one plug wire is coming and going (that seems odd)

3) Some spark related electronics / computer control is coming and
going

4) Yikes, the truck is jinxed



On Wed, 14 Dec 2005 18:54:48 -0700, "johanb"
<ollieb1oREMOVE@THIScs.com> wrote:

>Your kidding right ???????/
>
>What about the other 5 cylinders !!!!!!!!!!!!!!!!
>
>Only 1 has to be bad to cause a rough idle.
>
>
>
>Good luck
>



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Old 12-15-2005, 18:01   #8 (permalink)
pedal tothe metal
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Posts: n/a
Re: ford ranger rough idle p0301 and p0171

No, didn't try that. Wasn't sure if it was safe with electronically
controlled ignition to pull the plug and leave it hanging. I guess I
can take the old plug and connect it to the number one plug wire
(while plug is laying on chassis metal) to test for spark.

Does the coil pack have electronics in it besides just the coils?
Perhaps what is driving the coil pack (computer?) is the problem. I
have an oscilloscope, may need to test the signal driving the coil
pack.

As for the ice / water. I was just wondering if running water through
the injector will clog it?

The thing is, LOL, it has to stop running smoothly :-|
See my other post. Can a coil pack come and go?

Thanks...


On Thu, 15 Dec 2005 11:14:10 -0500, "gw" <no.spam@here.com> wrote:

>Did you run it with the plug out to see if #1 is sparking? If it's not, I
>would suspect the coil pack.
>
>If you had ice in an injector, it wouldn't last long after warmup. Instead
>of a screwdriver you can use a length of garden hose to listen to the
>injector.
>



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Old 12-23-2005, 04:01   #9 (permalink)
pkurtz2
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Posts: n/a
Re: ford ranger rough idle p0301 and p0171

I had this issue on my 2000 Ranger with the 3.0 flex. On top of your engine
should be a sensor mounted with 2 rubber hoses running down to your EGR
tube. The sensor is called the Exhaust Gas Pressure Differential Sensor.
They are known to clog. The pain is that there is no code for this problem,
it just tells you something else, and you have to cross the ford part # to
get a new one. O'reillys got mine for me at the price of $55. Check it out..
Let me know.



"pedal tothe metal" <pedaltothemetal@mail.org> wrote in message
news:a52sp1l9t05kqku3l58akgrbjnkjhuigo0@4ax.com...
> It got very cold (below freezing) a few days ago (texas). The next
> day, quit suddenly, the idle became very rough - but no stalling. The
> next day the check engine light comes on (it was about time, LOL).
> Also, the rough idle doesn't seem to improve with temperature / warm
> up. Engine smooths out at higher rpms but is rough under load / high
> torque (low rpm) conditions.
>
> Autozone says two codes: P0301 cyl 1 misfire detected, and P0171
> system too lean bank 1.
>
> I'm thinking a clogged fuel injector as the common denominator from
> those codes. Does that sound right? Is it possible that some water /
> ice entered the fuel system somehow and clogged the injector?
>
> Vehicle is '98 ford ranger, 3.0 L, 97K miles.
>
> Thanks...
>
>



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Old 12-23-2005, 13:01   #10 (permalink)
pedal tothe metal
Guest
 
Posts: n/a
Re: ford ranger rough idle p0301 and p0171

Strange that you should mention that.

This past spring that device and the egr were both replaced. In that
case the check engine light did come on. That repair was so
expensive, $500, (@ firestone) that I'll not do that ever again. As
you might be aware, the cost for both egr parts is like $160 at
autozone. Firestone was charging double that for the parts and then
exorbitant labor. You know there is profit at $160, and you can guess
the profit at $320. I used to go to firestone regularly for repairs
but have moved and the local store act like crooks. After the repair
I asked about what I should do if the light comes on again. I
expected to hear: we warranty what we sell. Instead I got: well, it
would probably be something else we didn't work on.

I had another run-in with firestrone a couple of weeks ago about
rotating my tires (a free service) and once again they acted like
crooks.

Anyhow...

I'm fairly sure that my problem is a fuel filter that is
disintegrating and the pieces are clogging the injectors. The filter
is original equipment. Unfortunately it looks like I've munged the
special tool required to release the filter and will have to do some
fuel line cutting and replacing. I think I'm going to wait for warmer
weather before undertaking.

Thanks for the feedback...


On Fri, 23 Dec 2005 05:41:34 -0600, "pkurtz2" <pkurtz2@cox.net> wrote:

>I had this issue on my 2000 Ranger with the 3.0 flex. On top of your engine
>should be a sensor mounted with 2 rubber hoses running down to your EGR
>tube. The sensor is called the Exhaust Gas Pressure Differential Sensor.
>They are known to clog. The pain is that there is no code for this problem,
>it just tells you something else, and you have to cross the ford part # to
>get a new one. O'reillys got mine for me at the price of $55. Check it out..
>Let me know.



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