Question about 2000 Ford Expedition

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My truck keep falling deed at stop sign and red light i change the crankshaft ckp sensor but im still having the same problem with it doind the same thing need urget help.

I was told that it might be in the mass air flow maf sensor so im trying to find out would that solve the problem. need a answer to this question about my truck keep falling deed when it do that, i can start it right back up and go on but when i stop for the red light it fall deed.

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  • Ford Master
  • 4,057 Answers

Vacuum leak or blocked filter is more likely the problem, idle is controlled by the vacuum. if its losing vacuum it will not hold the valve open to let air flow though. look for cracked or split vacuum lines. can even be a damaged diaphragm, not holding.

Posted on Mar 08, 2018

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5 Suggested Answers

autodr

autodr

  • 260 Answers

SOURCE: Cleaning the Mass Air Flow Sensor

i will try to help. 171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.

Posted on Nov 15, 2008

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Molson02536

Harvey N Tawatao

  • 3854 Answers

SOURCE: PO174 HOW TO CLEAR THE CODE

Okay so the more oxygen in the exhaust (lean condition) the lower the voltage from the O2 sensor and the more fuel the computer calls for. Then the oxygen content in the exhaust drops (because it is being used up in the combustion process), and the voltage increases (rich condition) and the process repeats, for as long as the car is running, hundreds of times a minute. A gasoline internal combustion engine needs oxygen to burn the fuel. If the mixture is ideal (or 14.7:1) then all of the oxygen is consumed as the fuel is burned. The exact amount of fuel needed to produce a 14.7:1 air/fuel ratio varies with barometric pressure (altitude), relative humidity and fuel quality and condition; thus the need for oxygen sensors.

So knowing all of this what should we check when we have those pesky rich or lean codes? The most common issues for lean codes are:

1. Vacuum leaks - check for failed or loose vacuum lines, leaking intake gaskets, intake air tubes loose or any other source of un-metered air leaks (leaks after the Mass Air Flow Sensor) 
2. Restricted fuel filter or bent/pinched fuel system lines 
3. Incorrect input from other sensors, such as the Mass Air Flow Sensor, which may not always drop a separate code 
4. Engine misfire – Yes I know this one may seem weird. You might think that if there is a misfire then you will have all that unburned fuel and it should read rich; right? Well the O2 sensors read only oxygen content in the exhaust, so if you have all that unburned fuel from incomplete combustion then, you guessed it, you also have all that unburned oxygen. High O2 content in exhaust equals a lean reading!

There are also some other possibilities such as an internally leaking EGR system, (but this will typically set a separate code). A leak in the exhaust system before the O2 sensor will also cause incorrect readings. And always check for after- market modifications. These can throw a wrench into the works! The only other possibilities (however unlikely), are wiring issues, computer concerns or a bad O2 sensor!

P0174 is a Lean condition on the side of the engine where cylinder # 2 is. Good luck and hope this helps.

Posted on May 01, 2009

mcgyver468

Mark L. Roberts Jr.

  • 710 Answers

SOURCE: 2001 ford mustang service engine light on

IT ALMOST SOUNDS LIKE YOU MAY HAVE A VACUUM LEAK SOMEWHERE. USE A LENGTH OF RUBBER HOSE AND HOLD IT UP TO YOUR EAR TO PIN-POINT THE LOCATION OF A VACUUM LEAK. HOPE THIS HELPS. LET ME KNOW PLEASE. THANK YOU IN ADVANCE FOR AN HONEST RATING AND THANKS FOR USING FIX-YA. P.S. EGR VALVE IS VACUUM ACTUATED

Posted on May 07, 2009

MNfisherman

Nate Stansfield

  • 11896 Answers

SOURCE: 2003 Ford Taurus stalls at idle

go to autozone.com and register for free. You will then have a full free online repair manual with step-by-step directions, diagrams, troubleshooting, testing, replacing, and more. As an automechanic myself, this a wonderful site.

Posted on Jul 09, 2009

blueextc3221

blueextc3221

  • 15935 Answers

SOURCE: location of mass air flow sensor

The sensor is mounted on the throttle body between the air cleaner assembly and the air cleaner outlet tube.

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Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Posted on Sep 04, 2009

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1 Answer

Where is the crankshaft sensor on a 2007 saturn outlook xr 3.6 ive been lookinh for 3 days and im seeing to many different locations online


Crankshaft Position (CKP) Sensor (LY7)
Left side of engine compartment, lower rear of engine block, above transmission

Remove the exhaust manifold lower heat shield. Refer to Exhaust Manifold Lower Heat Shield Replacement .
Disconnect the engine wiring harness electrical connector (3) from the crankshaft position (CKP) sensor (4).

Jan 15, 2018 | Saturn Cars & Trucks

1 Answer

Need to know the location of both crankshaft position sensor on 2008 Chevrolet hhr plz thx


Only has one crankshaft position sensor ,an cam sensors . To change the crank sensor u would have to pull the starter ,located above starter .
Camshaft Position Sensor Replacement - Intake Camshaft Position Sensor Replacement - Exhaust
After a crank sensor replacement a
Crankshaft Position System Variation Learn has to be done !
Important: The crankshaft position (CKP) system variation learn procedure is required when the following service procedures have been performed, regardless of whether DTC P0315 is set:
?€¢
Engine replacement


?€¢
Engine control module (ECM) replacement


?€¢
Crankshaft damper replacement


?€¢
Crankshaft replacement


?€¢
CKP sensor replacement


?€¢
Any engine repairs which disturb the crankshaft to CKP sensor relationship

Important: The scan tool monitors certain component signals to determine if all the conditions are met to continue with the CKP system variation learn procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
?€¢
CKP sensor activity--If there is a CKP sensor condition, refer to the applicable DTC that set.


?€¢
Camshaft position (CMP) signal activity--If there is a CMP signal condition, refer to the applicable DTC that set.


?€¢
Engine coolant temperature (ECT)--If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.

Apr 04, 2016 | Chevrolet Cars & Trucks

1 Answer

What is code p0727


Possible causes
- Faulty Crankshaft Position (CKP) Sensor
- Crankshaft Position (CKP) Sensor harness is open or shorted
- Crankshaft Position (CKP) Sensor circuit poor electrical connection
- Communication error between the Engine Control Module (ECM) and Transmission Control Module (TCM)

The P0727 Codes is triggered when the TCM receives no signal from the ECM.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0727 Description
The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).


May 06, 2015 | Cars & Trucks

1 Answer

P1336 gm code


P1335 CHEVROLET P1335 CHEVROLET - Crankshaft Position Circuit Possible causes
- Faulty Crankshaft Position Sensor
- Crankshaft Position (CKP) Sensor harness is open or shorted
- Crankshaft Position (CKP) Sensor circuit poor electrical connection help.png Help with this
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- Engine Stall
P1335 CHEVROLET Description
The Crankshaft Position (CKP) sensor sends pulses to the Powertrain Control Module (PCM) as the reluctor wheel teeth rotate past the CKP sensor. The PCM uses the CKP pulses to synchronize the ignition and fuel injector operation, and to time the interval between each CKP pulse. The PCM determines when an excessive change in crankshaft speed occurs by comparing each new time interval with the previous interval. A misfire causes an unexpected change in the crankshaft speed. A certain amount of acceleration/deceleration is expected between each firing stroke, but if the crankshaft speed changes more than an expected amount, the PCM interprets this as a misfire. The interval between CKP sensor pulses is extremely small. At high engine speeds, slight variations in the following components make misfire detection difficult:
- Crankshaft
- Reluctor wheel
- CKP sensor
The PCM learns variations during the Crankshaft Position System Variation Learning Procedure. The PCM compensates for these variations when performing detect misfire calculations. Only a scan tool can command the PCM to perform the Crankshaft Position System Variation Learning Procedure again.
Perform the learning procedure after the following actions:
- A PCM replacement
- Any operation or repair involving the crankshaft, the CKP sensor, or the CKP sensor to reluctor wheel gap relationship.
- An engine replacement.
- The ignition switch is in the ON position until the battery is drained.


Read more: http://nissanhelp.com/diy/obd_codes/p1335_chevrolet.html#ixzz37IoD1Imx

Jul 12, 2014 | 2001 GMC Safari

1 Answer

Po335, engine ligt on, slip and vdc brake light on 2005 armada


Error Code: P0335
Description:
Crankshaft Position (CKP) Sensor - Circuit Malfunction
Possible Cause:
Wiring.
Crankshaft position (CKP) sensor.
Engine control module (ECM).

Mar 25, 2014 | 2005 Nissan Armada

1 Answer

My 2004 expedition keep falling deed me when i stop at a redlight or a stop sign i've cange the p320 crankshaft position sensor but the still falling deed and the check engine light is on so i was told i...


If the problem is a closed throttle issue, check and clean the idle air control. My Ford info says if you suspect the maf sensor, with everything off, unplug the maf sensor. Start the vehicle and take it for a spin. If it does better, you may have to check out the maf system. Sensor--wiring connector--wiring circuit and computer.
The code doesn't tell you what to replace, just that the computer thinks there is a problem on that system, somewhere. I usually check sensor wiring circuits before I replace anything. I usually check crank and cam sensors both when there is a code for either one. Just my opinion.

Oct 19, 2017 | 2000 Ford Expedition

1 Answer

I have a 2004 ford expedition it falls deed when i stop at red light and when i stop for a stop sign but it start right back up and runs good until i stop for red light then it fall deed need help i chane...


simple test to do
apply the hand brake
start the engine --if it idles ok --no engine problem
apply the foot brake --if it stalls ---replace the brake booster
if it runs ok --run the fault codes

Apr 02, 2017 | 2000 Ford Expedition

1 Answer

Replaced camshaft and crankshaft position sensors in my 2005 altima also the o2 seneor car still will not run. error code 335 What else could be the problem?


DTC P0335 - Crankshaft Position Sensor A Circuit Malfunction
The crankshaft position sensor (CKP) measures crankshaft location and relays this information to the PCM (Powertrain Control Module). Depending on the vehicle, the PCM uses this crankshaft position information to time the spark properly or on some systems it is only for misfire detection and does not control spark timing. The CKP sensor is stationary and works in harmony with a reluctor ring (or toothed ring) that is attached to the crankshaft. As this reluctor ring passes in front of the CKP sensor, the magnetic field created by the CKP sensor is interrupted and this creates a square wave voltage signal that the PCM interprets as crankshaft position. If the PCM detects that there are no crankshaft pulses or if it sees a problem with the pulses on the output circuit, P0335 will set.

A P0335 "check engine light" code could be caused by:
Damaged CKP sensor connector
Damaged reluctor ring (missing teeth or not turning due to sheared-off keyway)
Sensor output open
Sensor output shorted to ground
Sensor output shorted to voltage
Failed crank sensor
Broken timing belt
Failed PCM

If you need additional details about test and solutions, just contact us in the Code Link.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer. Thank you for using Fixya, and have a nice day.

Jose.

Oct 21, 2011 | 2005 Nissan Altima

2 Answers

2005 nissan almera,1.5letre.. fault code po725


P0725 NISSAN - Engine Speed Signal

The P0725 Codes is triggered when TCM does not receive the engine speed signal from ECM.

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
- Open or shorted CKP sensor circuit condition
- Poor CKP sensor electrical connection
- Check communication error between the ECM and TCM
- Failed CKP Sensor

Possible solution:
Very common problem with Nissan vehicles, usually replacing the Crankshaft Position sensor takes care of the problem.

Keep us updated.

Feb 12, 2011 | 2005 Nissan Altima

1 Answer

Jsut want to know where crankshaft position sensor


Hi!!

here are illustrations of the CKP (crankshaft position) sensor in 2.3L and 3.0L.

Note: In the bottom of the 2.3L drawing says Trottle Position (TP) Sensor, this is wrong, It should say CKP Sensor.


2.3L Engine


The Crankshaft Position (CKP) sensor is located to the left of the crankshaft pulley.

0996b43f80202990.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Crankshaft Position (CKP) sensor location-2.3L engine


3.0L Engine


The Crankshaft Position (CKP) sensor is located just behind the crankshaft pulley on engine block.

0996b43f8020299e.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Crankshaft Position (CKP) sensor location-3.0L engine

The cost of the sensor is $23 bucks at AutoZone.

If helpful, click below

Apr 15, 2010 | 2002 Ford Escape

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