Question about 2002 Ford Explorer

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Why would it idle rough

Changed coil pack and gaskets

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U changed coil pack after or before this problem ??

Posted on Jun 20, 2014

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  • Ford Master
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Run fault codes and check for injector /fuel pressure faults.

Posted on Jun 07, 2014

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Posted on Jan 02, 2017

  • 75 Answers

SOURCE: my check engine light is on with a code of a

Did you route the new wires ezxactly as they came off the truck? There are service buletins on this issue with doge. Not sure if the same for Ford on this but check. Some plug wires if crossed will cause a P0301-P0308 code or even a P0300 which is random misfire. There may be a service buletin on this for routing and a procedure for doing so! I had to do this on my dodge with the 5.2 ltr. The guy i bought the truck from gave up and i got it cheap this fixed the problem!

Posted on Jan 28, 2010

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SOURCE: Same issue with the rough idle with a warm engine 4.0 Ranger

i would think a plugged fuel injector on # 6 cylinder could be the problem,or a big vacuum leak at that cylinder
a valve burnt/stuck could be but you dont see much of that anymore
could be coolant leaking into cylinder from leaky haed gasket but you would have to add coolant every so often
i would check #6 cyl. spark plug after driveing around a while if it looks new, ie no deposits on it then an injector would be what i would change next

Posted on Mar 20, 2010

SOURCE: 2001 ford focus idles rough will stall

Sounds like a vacuum leak
Also check out EGR Valve and TPS Sensor.

Posted on May 01, 2010

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keithheavili
  • 410 Answers

SOURCE: 1997 ford explorer 4.0 still runs rough after

It could be many other things. Have you changed the air filter? I could be extremely dirty or it could even be a vacuum leak that is making it run rough. Is there a check engine light on? If so that could help find the problem. If it's not something that simple you would need to start looking to see if all cylinders have the correct compression because it could be a blown head gasket or some other internal engine problems. Let me know if you have any further questions. Thanks for using FixYa!

Posted on May 15, 2010

Testimonial: "thank you.. and yes the engine light is on and flashs sometimes.. the code read that i had 4 misfires before i changed the plugs and wires & coil "

skychief2001
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SOURCE: Replaced plugs and coil pack on 2001 ford taurus now car will not start

You will need to figure out if you have spark to the plugs, and if not- if you have voltage to the coil to proceed.

Posted on Aug 04, 2012

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1 Answer

My car has a rough idle, hesitates in drive and has no power, in park it revs good!


coil pack come to mind here ,or a air leak on the manifolds maybe??

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What could cause it to idle rough


No codes? In the following order I would clean the idle air control, change spark plugs, check plug wires, check for vacuum leaks, run some fuel injector cleaner through your fuel tank.

May 06, 2014 | 2002 Ford Explorer

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What engine do you have? is check engine light on? You said you changed coil pack, but what about spark plugs? could be fouled by normal wear, improper application/plug gap, oil fouling (oil residue on electrode) caused by bad valve guide seals or bad piston rings or gas fouling(electrode wet with gas) caused by bad plug, wire, injector, O-2 sensor. Could be caused by a vacuum leak (hose or intake manifold/gasket) Check all vacuum hoses for cracking/chaffing, repair as needed. with engine idling spray carburetor cleaner at base of intake manifold watch for rpm increase if so there is a vacuum leak. Could be stuck open egr valve, Could be compression problem or timing chain problem. This is the best I can do with info you provided. Hope it helps.

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I change coil pack,transmission speed sensor but the engine still in rough idle


Would search first inlet air leak in between air box and engine - all hoses on, clamps tight no cracks
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Car is idling rough all coil packs have been changed along with spark plugs


Dont get another harness. If you are using Autozone supplied coil packs, the problem is most likely the coils from Autozone. I have went through this exact same thing before. I changed the coild because one had a burn mark on the boot between the plug and the coil pack. I noticed it when changing spark plugs. The new coil from Autozone made the vehicle struggle on take offs and idle rough and the vehicle had no power. I installed another coil from Autozone again which was supposedly a better model and costed more. The vehicle ran a little smoother but the rough idle and small misfire was still there. I installed another coil from the dealership and the problem was fixed immediately.
I also replaced one of the coil connectors for a different cylinder but only because i broke it when disconnecting the coil packs to remove the spark plugs.
And when I installed all my coils and the new one from Autozone, I used dielectric grease on all the connectors. But the rough idle and power loss was immediate following installing the new coil from Autozone.
Beware if you are using coils from another part store because many part stores get their parts from the same source.

Jul 18, 2012 | 1996 Volvo 960

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Recently I had my 2000 gmc 2500 6.0 liter truck start running rough. I changed the spark plugs, checked the coil packs and replaced the fuel pumpand fuel filter. Still no change....Any suggestions?


ROUGH IDLING CAN BE CAUSE BY MANY THINGS.I AM LOOKING AT LEAKING VACUUM HOSES OR INTAKE MANIFOLD GASKET LEAK.DIRTY FUEL INJECTORS AND WORN ENGINE VALVES WILL CAUSE ROUGH IDLING.ALSO LOW IDLE SPEED CAUSE ENGINE TO RUN ROUGH.

Apr 18, 2010 | 2000 GMC New Sierra 1500

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No heat, rough idle then pop and smoke from coil pack 2001 caravan 3.3


YOu should be able to tell if coolant leaks caused the coil pack to fail. I believe it is 2 issues.

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