Question about 2002 Ford Explorer

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What would cause my 2002 ford explorer xls to idle rough

Changed coil pack, tps sensor, and gaskets

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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.

Posted on May 07, 2014

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Posted on Jan 02, 2017

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SOURCE: idle issuse

You need to clear the codes from the ECM, and re-run diagnostic code. If you still have codes
Check your grounds. If you still have power issues, re-check your wiring or firing order. If you have spark only on 2-4-6, where is your 1 - 3 - 5. If I remember correctly those vehicles have double ignition modules. One for the right bank and one for the left bank. But not sure. When was the last time you change your spark plug wires? Your PCV? Fuel Filter? Air Filter?. As for your cam shaft sensor, run a coninuity test on the harness and ensure is working correcty. Why did you change the ECM, those things hardly go bad, unless you disconnected it while you had power going to it. Probably nothing wrong with the old one.
Ensure you don't have vacuum leaks (PCV Valve, EGR Valve) Check your fuel pressure if you can. Suggest you change fuel filter. Could be partially clogged and not allowing the proper atomization of fuel. (Also did you gap your plugs correctly or just threw them on as is?)

Posted on Oct 31, 2008

  • 474 Answers

SOURCE: My 1999 Ford 4.0 has a hard miss at driving speeds

you probably have a vacuum leak and by the sound of it, it idles rough with the brake pedal depressed its your brake booster

Posted on Sep 08, 2009

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 "

SOURCE: what causes 2000 taurus engine rough idle but no codes

I had a head gasket going when I have a rough idle. Just weeping coolant past the number 1 cylinder. When I pulled the head the piston was all shiny and steam cleaned. $500 dollars all good now.

Posted on Nov 04, 2013

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Jan 31, 2016 | Cars & Trucks

1 Answer

Why a 2002 ford explorer idles rough?


Several things can cause rough idle on a Ford.

Check all vacuum hoses for, first of all, that they are there, and then that they have not been chewed by mice or squirrels (that happens), or rotted away (that happens too).

Check the coil pack(s) for corrosion at spark plug terminals, check plug wires--at night, the darker the better, raise hood with engine running; blue sparks or lightning jumping around the wires and plugs means your wires are dead--check plugs for fouling or tip wear, if your car has over 100,000 miles check catalytic converter and fuel filter, and check the TPS. The throttle position sensor monitors where the gas pedal is, and since most of the time, it is at the place that makes the car go 55, or idle, the TPS can get worn in those positions and send false signals to the PCM. Fords of that vintage also used a pulsed air feeder that can cause rough idle and is very difficult to service.

Best bet is vacuum leak first, then spark, then fuel, then the out-there stuff.

May 07, 2014 | Cars & Trucks

1 Answer

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

2 Answers

Why would it idle rough


run fault codes and check for injector /fuel pressure faults.

May 06, 2014 | 2002 Ford Explorer

1 Answer

What would cause it to idle rough


MANY THINGS CAN CAUSE IT TI RUN ROUGH. IS YOUR CHECK ENGINE LIGHT ON? IF IT IS GO TO AUTO PARTS STORE HAVE THEM RUN A SCAN ON THE CAR AND IT WILL TELL YOU WHAT TO LOOK AT TO SOLVE THE PROBLEM. THINGS THAT CAN CAUSE A ROUGH IDLE: BAD PLUGS, BAD COIL PACKS, VACUUM LEAK, BAD CAM SENSOR,BAD PLUG WIRES, TO NAME A FEW.

May 06, 2014 | 2002 Ford Explorer

3 Answers

What causes 2000 taurus engine rough idle but no codes


remove neg. cable from battery so the ECM will reset this may work. make sure the IAC is air tight. if this doen't fix your problem have someone check the IAC valve if it's bad the part runs $300.00 pluse

Nov 25, 2011 | 2000 Ford Taurus

1 Answer

ENGINE IDLES ROUGH IVE CHANGED PLUGS WIRES COIL MASS AIR FLO TPS AMBIENT AIR IAC AND STILL SHOW MIS FIRE ON # SIX CYL ANY SUGGESTIONS THANKS


You might want to look at that injector for that cylinder.I worked on a GMC Jimmy that did the same thing and I also changed all the sensors come to find out that my injectors and the spider assembly needed to be changed.

Feb 23, 2011 | 1998 Ford Explorer

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