Question about Ford Focus

Open Question

97 ford explorer 4.0 sohc it tripped P0320 , I have no VSS readings using a scan tool , and the o2's don't read any voltage but at the plug for the o2's I have voltage please help

Stalling at stopping , high idle speed and fuel trim is at -100 poor fuel economy , the mass air meter shows very poor voltage but I have all the acceleration I need .it shifts fine unless I'm braking and then I have to stand on the the brakes , in warm weather it does ok but in cold weather it stalls , like I said the scan tool shows no voltatage reading live data but when I check the plugs and harness I have voltage where I should ? I am at a loss and the customer is ****** now he is doubting my ability and I'm starting to question myself please help

Posted by on

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 6982 Answers

SOURCE: jeep wrangler stalls out

check idle air control, tps & map sensor. As usual with electronics, test test test before buying anything/

Posted on Feb 18, 2009

  • 2 Answers

SOURCE: engine stalls after cold start-up & release from high speed idle

I had a similar problem.  I found the filter cartridge below the pcv valve had carboned up, and after the crank case pressurized, oil was forced out the pcv supply line to the throttle body.  The idle air control valve solenoid got oil in it and caused my problem, but only when it was cold.  The pcv cartridge is accessed by removing the pcv valve and the rubber fitting that the pcv valve mounts in.  It can then be fished out with a pick set, and it is a pain because you can't see it, but you can get you hand back there.  I hope this helps you.

Posted on Feb 28, 2009

  • 37 Answers

SOURCE: 98 Astro Van,when warm hesitating, stalling


Posted on Jun 27, 2009

  • 3854 Answers

SOURCE: 2001 ford explorer sport,6 cylinder,rough idle and

If there is a Auto Zone around your area, have them scan the Explorer for any DTC codes since it's fee of charge. But in the mean time buy a can of MAF cleaner and follow the instructions and also buy a can of Trottle body cleaner and follow the instructions on the can. Clean the MAF and the Throttle body, also try to get the Idle Air Control falve cleaned too which is on the throttle body. So use up the whole can of Throttle body cleaner and it would not hurt to use two cans. Once everything is cleaned that should fix the problem, the other thing to that would cause your poor idle and stalling is a bad or dirty EGR valve which can be cleaned with Carburetor cleaner since it's stronger then the Throttle body cleaner, just remove the EGR and spray the Carbon build away and place back in place. Note: the Carb cleaner is to strong for the gaskets used on the throttle body so don't use it on the throttle body. Good luck and this should help get your Explorer running 100% soon.

Posted on Jul 09, 2009

  • 34 Answers

SOURCE: 2002 vw passat....starts fine and drives

It appears that your brake booster system has a major vacuum leak which is causing the engine to go lean and stall. Check the hose between the intake manifold and the brake booster. It may be cracked or loose causing outside air to enter the hose when the brake is applied.

Posted on Jan 15, 2010

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

1998 ford 5.4 o2 sensor 2 scan tool readings only 30 and no fluctuation. What do I look for?

Try changing o2 sensor Should be between .100 and .900 volt and very quick changing. if defective ecu give him a fix prevalue.His it a one,two or four wire o2 sensor if it is four it is a HTO2 (heated o2 sensor must have 12 volt ign on too)

May 04, 2014 | 1998 Ford Expedition

1 Answer

Speed sensor

there are many on some cars 5 or more.
what engine,? what transmission?
1: crank shaft rpm CKP sensor.
2: VSS 1 tranny front sensor Automatics.
3: vss 2 tranny rear. """
4:speedo back up VSS to vss 1.
5: cam speed, or Angle.

why not say the symptoms and why VSS is on your mind.
did you use a scan tool, if not why not?
the scan tool will tell you which sensors readings are wrong
and just because one is, dont mean the sensor is bad.
the PCM /ECU never knows what is bad, ONLY what tests
failed (called monitors) and its the job of the technician
to do the FSM tests. and find TRUE CAUSE.

SCAN it and stop guessing, or go broke.

Jan 22, 2014 | 2008 Suzuki SX4

1 Answer

Engine code p0138

no year, no joy, all i know is 1996 to 2013
no model stated,,, ouch. wrangler?
this is federal usa spec code P0 are. that.
O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

Read more at:

the rear oxygen sensor (not front) is sending wrong data.
it reads too high.
this means, 1: the wires to it are cut, burnt, melted or corroded.
or the sensor is bad
i might mean the CAT is bad. (the FSM shows the trip limits.)
since no year, and no car model stated, i cant get exact.

high is 1v, we know that, but is the failure , for over 1v?
if yes, the sensor is blow to bits or not connected.

ill roll the dice (snake eyes) 1996 wrangler, 4.0L , A/T

O2 (B1 S2) Circuit Short to Voltage
Number of Trips to Set Code: 1
Trouble Code Conditions:
Engine started; engine runtime more than 4 minutes, system voltage over 10.5v, ECT Sensor more than 180?F, and the PCM detected the O2 signal was more than 1.50v for 3 seconds.
Possible Causes:
  • O2 signal tracking (wet/oily) in connector due to short from signal to power circuit
  • O2 signal circuit is open
  • O2 ground circuit is open
  • O2 is damaged or it has failed
  • PCM has failed (never,will it be ,here.....well protected , im sure.)

1.5 v is illegal reading from the 02
O2 means the natural state, of 2 Oxygen atoms. the come in pairs.

what I do is connect my scan tool and plot B1S2 02 sensor
if it reads wrong, i clean and check connections.
ifi it still reads wrong its kicked to the curb (a new one)

hand wired i can get them for $20
PNP from Bosch $50 (plug it in, and play)

Nov 28, 2013 | Jeep Cars & Trucks

1 Answer

2001 Ford explorer Sport 2 door stalls after 5-10 mintues of driving with a/c off or on. P0320 code comes on. I've changed the crankshaft, camshaft, idle air control valve, mas air flow, egr, O2 Sensors....

Nine parts replaced & not a one ever tested or
failed a test,nice job

Take it to a professional shop to be properly

You can find a lot on the internet related to a PO320
to work on & not change all that ,need a different hobby

Sep 07, 2013 | 2001 Ford Explorer Sport

2 Answers

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.

Dec 29, 2012 | 2007 Toyota Land Cruiser

1 Answer

97 ford explorer battery alternator and battery just replaced. Engine light is on and 4w drive lo and high lights keep blinking, what's wrong?

might have a bad o2 sensor wich is tripping your check engine light and a vacuum leak wich is causing your 4lo 4 high light to blink

Nov 02, 2009 | 1997 Ford Explorer AWD

1 Answer

Oxygen sensor for 1999 ford explorer

97 ane 97 have 4. I will assume that yours does too.

Go under Explorer.
Trace exhaust maniford from engine to catalytic converter.... in that path, you will find an O2 sensor (looks like a spark plug right in the exhaust pipe).

Same item on other side.

Now, sad part. You MAY find 2 more O2 sensors just after the converter!!

Autozone can usually do a free diagnostic on your vehicle and tell you which 1 or 2 sensors are bad.

Oct 24, 2009 | 1999 Ford Explorer

1 Answer

My odometer is registering extra miles

Check/Replace the vehicle speed sensor (VSS).

VSS generate a pulse count to the vehicle computer. If this sensor send out extra count the speedometer will read higher also.

Use GoogleMap to plan a short trip. Reset the speedometer and see what's the mileage count.

Jul 15, 2009 | 2008 Ford Explorer

2 Answers

1998 ford explorer speed senors

The VSS was deleted for 1998. The vehicle speed signal is generated by the rear anti-lock brake sensor and sent to the 4-wheel anti-lock brake system (4WABS) module. The 4WABS module sends the vehicle speed signal via circuit 679 (GY/BK) to all systems which require a vehicle speed signal input.

Did you recently change tires to maybe a different tire size. If so this may be your problem.If so to correct this you would have to have this calibrated into the PCM with a scan tool.

There is also a technical service bulletin out for harsh downshifts the number is 99-8-7. This requires a reprogram of the PCM.

Mar 24, 2009 | 1998 Ford Explorer

1 Answer


HERE. They have the Ranger, Explorer & Mountaineer on the same page but if you read through it, it will give you an idea on where to look.

Nov 20, 2008 | 1998 Ford Explorer

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

13 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers


Level 3 Expert

5501 Answers

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

Answer questions

Manuals & User Guides