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1999 Explorer Sport misfiring and almost stalling

1999 Explorer Sport(2-door) 4x4 with 4.0 SOHC V6. I put in new spark plugs and it ran smoother, but next day the engine seems like it is going to die. It is misfiring and almost stalling. This happens at idle and all speeds. What do you think could be the problem? No check engine light comes on. Also, is it necessary to have platinum plugs?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Handy Mike
  • 6 Answers

SOURCE: how do i replace the pcv valve on a 2000 explorer xlt v6 sohc?

On the passenger side of the intake manifold, coming off the bottom about the center of the engine front to back, you'll feel a hose that comes off a nipple. That hose makes a 90 degree bend and goes around to the rear of the motor. Where that hose meets the Y-connector from the other side of the intake you'll find the PCV valve. It's almost impossible to see it with the hood installed, and even tougher to reach it.

A good source of information for Ford Explorers can be found here

Posted on Oct 25, 2008

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  • 4 Answers

SOURCE: Code #P0171 & code #P0174

The intake manifold gaskets need replacement as well as the o-rings inside - if you call FORD they should be able to get you the correct parts.

Posted on Nov 05, 2008

  • 34 Answers

SOURCE: 96 Ford Windstar runs rough, check engine light on

Sounds like you have some EGR ports clogged up, remove the intake and look at the egr ports all but
#1 cyl port will probably be at least partially clogged, hope this helps

Posted on Nov 18, 2008

  • 72 Answers

SOURCE: no reverse..1998 exporer sport 2 door 4x4 sohc v6 auto

your transmission part number for a motocraft rebuilt trans would be TRM1341, as far as they list it the transmission was only for that year, meaning you would need to find another 1998 explorer or 1998 mercury mountaineer in order to replace your trans. hope this helps :)

Posted on Nov 21, 2008

  • 1596 Answers

SOURCE: pcv valve :where is it located on a 1999 ford explorer sport 2wd

Look For A 3/8 th's Vacuum Hose Coming from The Base of Throtle Body Fallow it to the 2 Line PCV At Valve cover

Posted on Feb 10, 2009

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On a 2000 explorer 4.0 Soho do I have to remove the injectors to remove the lower intake


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REMOVE UPER INTAKE 97 EXPLORER V6 4.0 ... I was told that all I have to do is remove the fan belt to get access to it ... FordExplorer 2000 intake manifold gasket upper lower P0174 by froggy - Duration: 36:54. by froggy 36,588 views ... Ford Explorer 4.0L SOHC Rough Idle P0171 P0174 Lean Codes ...

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1 Answer

1999 Sport 4×4, 4.0 liter. Why does it sputter and stall in Drive?


all engines not tuned up do that. ! no engine size stated !
case in point, bad spark plugs....
ever do a tune up this decade? or ever?
spark parts, filters that? (open oper guide read 60k service and up)

reverse is a very low gear, and as such, a very low engine load
but drive, (1st ) needs more power. to move car faster.
and all spark plugs bad (old) on earth, just hate loads.
loads are when it misfires.
this is taught in school, ASE,
we put a bad spark plug in to the pressure spark tester
and watch it fail under pressure (loads).
same answer for 100 years.
my grandpa;s shop even in 1950 had one on the bench.
to prove to customers (non believers) that your plugs are bad.
we do tuneups now...
there are over 50 causes of misfire.
ill not attempt post them all
but I'll say, we do from 1 to 10 tests, and bingo.

one tests is the simple scan tool
connect it, got P03xx codes (DTC'S) bingo ? 2?
btw bad spark plugs will show up as P0301 up to (04 or 06)
06 be v6

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2002 v6 ford misfire on number 4 spark good bad ticking coming form number 4


sounds like broken spark plug boot leaking the + to the - causing misfire to much ignition grease maybe P0304 is the code the ticking sounds like electric spark leaking the + to -ground

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Why my engine is running rough


when last you service the engine,check your spark plugs and if it not running on all look at the set its not running on and check and see if any wet with gas if they are or if they black change them

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After testing the MAF sensor, changing the PCV & CO sensors, I still get the check engine light, 1999 ford explorer sport 4.0 SOHC 6 cyl I've read to check the intake manifold and then go fu


What is a CO sensor? Never heard of it. a 1999 OBD2 ford has approximately 1600 possible fault codes most of which can turn on the light. If you dont know which one is turning it on, you are guessing randomly which is expensive and usually unsuccessful. get the code(s) and then diagnose the possible causes. The vehicle you list (99 4L explorer) rarely had injector problems. Much more common were EGR sensor(DPFE) sticking at voltage, evap problems, misfires, and lean conditions due to dirty MAF, or vacuum leaks. get the fault code, or you will not fix the problem.

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you might try changing the engine coolant temp sensor. could also have defective spark plugs. check the fuel filter, lines and pump.

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Pcv valve :where is it located on a 1999 ford explorer sport 2wd


It is located at the back of the engine near the fire wall. It is gray with a T connector at the top with two hoses coming off of the T and going forward into the intake manifold.

Feb 10, 2009 | 1999 Ford Explorer

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