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Jeff Murray Posted on Mar 28, 2014

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

5 Related Answers

Anonymous

  • 6982 Answers
  • Posted on Feb 18, 2009

SOURCE: jeep wrangler stalls out

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

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Anonymous

  • 2 Answers
  • Posted on Feb 28, 2009

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.

juno222

  • 39 Answers
  • Posted on Jun 27, 2009

SOURCE: 98 Astro Van,when warm hesitating, stalling

WELL YOU CHANGED ALMOST EVERY THING EXCEPT IGNITION CONTROL MODULE........

Molson02536

Harvey N Tawatao

  • 3854 Answers
  • Posted on Jul 09, 2009

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.

roadsterred

  • 34 Answers
  • Posted on Jan 15, 2010

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.

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Related Questions:

0helpful
1answer

2001 Ford SPORT TRAC. The SPEEOMETER NOT WORKING?

Question edited for clarity and add maker. changed funky
'(letter)- space-comma-letter 'CLUSTER ,STILL NO SPEEDO'.
Question moved to Model Category.
Please don't type in all CAPS, it is considered SHOUTING and is harder to read.

Your problem is the VSS (Vehicle Speed Sensor). No idea why you would think it was the cluster or have anything to do with the ABS! Just take it to a professional.

The most common reasons a Ford Explorer Sport Trac speedometer isn't working are the vehicle speed sensor (VSS), a faulty speedometer, or an electrical issue. Search our network of RepairPal Certified shops near you to speak with a technician about your issue. The rear wiper may stop working.

Ford Explorer Sport Trac Speedometer Is Not Working

Videos as well

https://www.google.com/search?q=2001+Ford+SPORT+TRAC.+The+SPEEOMETER+NOT+WORKING

..
0helpful
1answer

How many oxgen sensor has ford explorer 1997 un sohc 4.l v6

has 4
2 heated oxygen sensors(HO2S)( one in each exhaust manifold before the cat converters to read the exhaust gas composition so that the ECM can adjust the air/fuel mixture) and 2 oxygen sensors(O2) ( one in each exhaust pipe after the cat converter to read the cats performance and to final tune the air/fuel mixture
0helpful
1answer

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.
0helpful
1answer

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.
so
O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

Read more at: http://www.obd-codes.com/p0138

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
quote:

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)



0helpful
1answer

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
diagnosed

You can find a lot on the internet related to a PO320
to work on & not change all that ,need a different hobby
1helpful
2answers

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.
0helpful
1answer

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
1helpful
1answer

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.



2helpful
2answers

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.
0helpful
1answer

1998 FORD EXPLORER SOHC O2 SENSORS

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.
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