Question about 1999 Ford Explorer

1 Answer

99 Explorer 4.0L 4x4 when cold runs rough. When all the way warm runs just fine. Replaced with OEM parts, MAF, PCV, O2 sensors, Fuel filter, air filter, and still get the check engine light. I have the IAT sensor and Coolant temp sensor to change out, but cannot locate the IAT on my vehicle. Please can you give me specific instructions on how to replace this one and if you think this could be the problem.

Posted by on

  • yadayada
    yadayada May 11, 2010

    the codes u had that made u decide to replace the listed parts do u realize that the code's don't mean the part itself is the problem? it only means the computer has detected a problem in the circuit of the sensor or the sensor itself, stop wasting money and get a proper diagnosis of the problem by a qualified technician, or buy a factory emission's service manual and follow the pin point tests for each code, this is the only way to fix modern cars, guessing does work now and then, but mostly not...

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 49 Answers

Have you changed the plug and wirers ? it is runnig rich at idle .my be the injectors ar leaking

Posted on Jan 18, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Replaced Fuel filter, Plugs and wires, PCV valve and the Throttle air control valve. Still running rough. Could it be an 02 senor or the catalytic Converter? Car wants to dye out when coming to a stop or...


Hi there, i had a similar problem with my Legacy B4 RSK Blitzen, 2 litre Twin Turbo, Engine EJ208. Car would idle sort of ok when cold, after warming up it would idle erratically (idle hunting) and cut out sometimes. I notices the boost gauge hunting along with the RPM'S .I found it to be 2 faults. 1st fault - If you have an after market air filter and the car hasn't been mapped for the extra airflow past the MAF (Airflow Meter) then it confuses the ecu as its taking in un-metered air. Solution - Re-map car to take extra airflow or as i did, i took out the MAF and cleaned it with a can of Carb&Choke cleaner. It worked but still had rough idle.
2nd fault - Air could be in your cooling system. If there is air in the system then the engine temp sensor is reading hot/cold/hot/cold everytime an air bubble passes by, which will cause running problems. You may hear a gurgling or slushing noise in the car, which is air in the heater matrix. Solution - From cold open the header tank and coolant overflow bottle, un car untill engine warm and hold at 2000-4000 rpm untill you see air bubbles rise in the header tank. Make sure your hot air is turned on in the car and vents open. Do this process for 10-15 mins and when you think all air is out of system then re-fit header tank cap. Have a watering can at hand as you may require to top it up during bleeding. It will overflow but dont worry.


Only real problems Legacy's give are , Air Flow Meters, Knock sensors, and Lambda Sensors (O2 sensor). Hope this helps mate, keep us informed on how you get on.

May 01, 2012 | 2002 Subaru Legacy

5 Answers

2000 ford escort ZX2 with P0171 trouble code. Cleaned MAF, replaced MAF, replaced vacuum lines, replaced upstream o2 sensor. No change. Any ideas?


I am working on the same problem. This 2000 ZX2 was idling rough and throwing a p171 code (bank 1 too lean). I hooked up a scanner to the OBDII port and you could see the O2 sensor at 0 or very low voltage and not switching and the fuel compensation maxed out which indicates a lean condition. Using a flammable Carb cleaner and the engine running I sprayed around the vacuum hoses until the idle picked up. I found a rubber elbow that connects to the bottom of the intake maniflold and feeds vacuum to the PCV valve. Replacing the the elbow with a suitable replacment from the auto part misc parts cards display had it running smoothly and the O2 sensor switching properly. Since this was happening at idle it was not the fuel filter which can cause a lean condition in upper rpms. It is not the MAF or the O2 sensor since it switches when not at idle. Also check the smaller vacuum lines that go to the evap control from the intake vacuum ports (back of manifold just below the throttlebody, most will be cracking if your car is anything like mine. I have also seen this problem with a bad PCV valve.

Jun 01, 2010 | 2000 Ford Escort

1 Answer

1990 Cavalier 2.8 runs fine cold/rough when warm


Vacuum leaks. EGR. PCV valve. Head gasket. Timing chain. Fuel filter. Air filter. Idle control system or sensor. Engine ground. Could be lots of things. Any more info? Any engine lights on?

Jun 07, 2009 | 1998 Chevrolet Cavalier

2 Answers

Check engine light


Sometimes can be prematurely dirty air filter, sets off the air flow sensor, which sets off the o2 sensor. So might try new air filter first and erase codes and then see, before you spend more bucks than you need; then if codes return, do the flow mix sensor.

Apr 19, 2009 | 2006 Honda Civic Hybrid

2 Answers

Rough idle after initial startup.


Really the sky is the limit here. See when you first start vehicle the computer is in open loop which means it is not monitoring the O2 sensors and fuel control is set to a calibrated setting. After the Heaters heat up the O2 sensors it then goes into closed loop and starts monitoring the O2 sensors to control air/fuel. So anything in the fuel and air mix could be causing your problem like false air volume reporting from the MAF sensor,a vacuum leak,unmeasured air getting into the engine behind the MAF sensor from a leaking hose,,a faulty pcv system,lazy O2 sensors, etc.
I would first recommend cleaning the MAF sensor and resetting the keep alive memory.Get a T20 torx bit and remove the MAF and get some electrical cleaner and spray the MAF bulbs clean then let it air dry or blow it dry with light shop air. Then disconnect battery for about 30 minutes to reset the strategies and see if this cures your problem. It will take probably 50 miles of driving for the strategies to reset.

Apr 15, 2009 | Lincoln Town Car Cars & Trucks

2 Answers

2001 Explorer sport will not keep running when cold. After many restarts it will idle and is fine.


HI..............
Check for any vacuum hose disconnected or damaged.
Check the condition of the air filter.
Check the condition of the hose from the air filter to the throttle body. for no escape of air., loose clams.
Need to check the fuel pressure, replace the fuel filter.
After if the fuel pressure is OK.

Replace the part that control the idle when the car is cold.
The name is : IDLE AIR CONTROL MOTOR.
But before check everything show above.

Thank you for use fixya.

Jul 24, 2008 | 2002 Ford Explorer Sport

Not finding what you are looking for?
1999 Ford Explorer Logo

236 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

61249 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Fordexpert

Level 3 Expert

5331 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...