Question about 2001 Ford Explorer Sport

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Engine idding rough when cold - 2001 Ford Explorer Sport

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Check this Ford Forum, there's a instruction on how to fix the problem.

Posted on Nov 22, 2013


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I have a 2012 camry se that has a rough idle

NO CHECK engine lamp (CEL) glowing running???????
which engine, there are more than one engines, offered on most cars.
that is misfire. and misfire is complex.
there are 50 causes of misfire, on Otto cycle engines (gas)

and more if flooding.
hot or cold engine?
or both?
ever do the 60k tune up?
id bet the engine is good, so we can remove 1 of the 3 main causes.
1: bad engine , no
2: bad spark, id bet not if miles is low, is it? below 60k?
3: bad fueling.
that is the proper order,
so if car is tuned up and spark is good.
then it must be fueling. so we connect the scan tool (any Can-bus)
and see DTC errors and it MIL active.
ok its sees misfire P0300s?
if no errors and its misfiring.
we then look at all sensors live with the scan tool.
id bet the engine dont hold closed loop hot, idle , as it must.
screen says, CL = active, or like kind.
if v6, there are 2 banks that must be in closed loop status.
I'll stop here, but will say I have a battery of tests for CL failures.

one is to make sure the 02 sensors work right and that there
are no exhaust manifold cracks near any 02 sensor.
i try to force the engine leaner and righter (tricks) that might
wake up a dead 02,
to see if it swings. (called cross counts)
the causes are many if the sensors are good.
fuel pressure out of spec,
injectors bad, leaking or clogged.
bad fuel.
dirty MAF sensor.
ECT stuck at wrong temperature for any reason, 180F or more is good.
and more... ask.

Feb 06, 2014 | 2012 Toyota Camry L Sedan 2.5L 4-cyl....

1 Answer

Runs rough when cold

misfire cold.
ever tune it up. sparkplugs can fail when cold and rich conditions
are present(normal for cold)
ever seen the 60k service points lists it the glove box operating manual
id bet its due to not doing service.
am i right?
no engine size stated. so no details guessed.

Jan 11, 2014 | 1999 Toyota Camry

1 Answer

Jeep Grand cherokee rough idle and engine cuts out when you hit the gas

what engine.
hot or cold engine , or both?
does the cut out catch up.?
does it have full engine power up a hill wide open throttle. (key test)
on cuts, out tip-in throttle ?
dash CEL lamp off running.
scan PCM , no DTCs stored? (errors)
ever do the 60k mile tune up , (sparks and filters?)
i have 10 more quesitons, id see in 5min testing car. but .... here are some.

Aug 08, 2013 | 2006 Jeep Grand Cherokee

1 Answer

Will not idle when cold

Its cold start issues:----
Go through the list of help links mentioned below:----

Click the link :----

Cold start problem and vehicle shudder around 2500 to 3500 rpms
Low idle when cold out side?
Ford explorer 4.0 will not idle when cold?
Automatic transmission shift lever hard to move on cold mornings?
Car won't start when cold?

It can be issue with IAC( idle air control valve) causing the problem.

There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

Bad miss at idle?


Stumbling and stalling at idle after engine rebuild?


1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?


Engine stumbles coming off idle when warm?


Erratic idle on car?


Cold start problem and vehicle shudder around 2500 to 3500 rpms


Low idle when cold out side?


GMC Sonoma Stalls and idles low


GMC Idle Air Control (IAC) Valve Replacing?


1996 Camry intermittent engine failure while idle?


Engine quits at idle?


Car overheats and Air blows hot at idle?


High Idle Problem


While stop engine idles like cylinder missing?


Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?


High rpm in neutral? Inconsistant high RPM in neutral?


Vehicle stumbling at idle and shows code 54?


Rough idle, staling and Erratic shifting?


While stop engine idles like cylinder missing?


These details will help.


Dec 14, 2012 | 1999 Jeep Wrangler

1 Answer

High idle on cold start on a 86 dodge d50 2.0 liter

Feb 27, 2012 | 1986 Dodge Pickup 4WD

1 Answer

Engine Runs Rough When Cold...

there are 2 things id check first. the coolant temp sensor. and then the map sensor. good luck

Nov 24, 2008 | 1990 Ford F150

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