Question about 1994 Hyundai Excel

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Crankshaft sensor problems

Misfire and loss of power but not all the time mainly when hot

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Dosnt sound like crankshaft problem

Posted on Feb 13, 2015

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1 Answer

How do I fix a p1399?


Tech notes
Adjusting the valves will usually fix this problem.
When is the code detected?
The control module monitors the crankshaft speed and has detected a misfire condition
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P1399 Honda Description
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
- Valve clearance out of range

Jul 16, 2015 | 2004 Honda Odyssey

1 Answer

What is a misfire on engine control system?


The computer will set a misfire code when it sees a lag in the signal from the crankshaft position sensor. If the crank's rotational speed suffers a power loss from a cylinder not putting out as much power as the others, the computer will set the misfire code for that cylinder, or if it cannot determine which cylinder is not producing the expected power, it will set the code for a random misfire.

Troubleshooting misfire codes generally involves checking gas, spark, and compression. One of those, or the lack of it, is usually responsible for misfires.

Aug 03, 2014 | 2006 Buick LaCrosse

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

Random cylinder misfire


Scan the computer for trouble codes, unless that is where you got the random misfire code. It may point out the problem. Misfires are usually fuel/air, spark (ignition), or cylinder compression related. The pcm senses a loss of power through the crank sensor, noting the crankshaft doesn't turn as fast as it should. If it cannot isolate it to a particular cylinder, it will set the random misfire code.
Would be good to know what fuel pressure is as a start. Note that cold start problems may be fuel related, as the engine requires more fuel on a cold running engine. If the coolant temperature sensor is out of whack, the computer may not realize it is a cold engine. Just a possibility.

Apr 04, 2014 | 2007 Dodge Ram Truck

1 Answer

1995 jeep grand cherokee laredo jerking at 50 mph


which engine? (asked now 1000 times, only 2 ever answered)

tune up time, spark parts, rotor to plugs. filters. both.

its called a 60k mile tune up solves most.

my guess, is its misfiring or

is this the ASD relay dropping out then back in, as driven.

jerked before and after CKP sensor, did you know its the last thing to fail......

see the list of ASD drops.

misfiring, can be felt, its like a misfiring chain saw, ever here a 2 stoke misfire, ratta, tata ,tat?

some call it jerking, its not, is misfiring. (3reasons ) and 25 causes.

but jerkin real, like if you cut the ignition that is and instant bog.

but if you off the key and back on , fast, that be a jerk

that is total power loss. not misfire. its loss spark and fuel.

and jerks hard.

so does loss of 12vdc to the EFI system.

so the first step is to see if its the ASD relay dropping out.

on all jeeps.. 93 to now.



ASD



http://www.fixkick.com/Jeeps/ASD.html



automatic, shut down. (relay and EFI logic)



key point, the ASD will kill the engine, if fit sees spark is bad.

so its a chicken and egg deal.

here is the logic.

key on , crank , ASD closes, fuel injects and engine starts

then dies in seconds. or runs full time.

note that if the ECU sees spark dead, it cuts spark.

Sounds odd , huh. but is NOT.

this relay stops all car fires. (caused by this protection not in place)

Apr 02, 2014 | 1995 Jeep Grand Cherokee

1 Answer

Subaru Tribeca B9 Misfiring


Misfire can create a lot of heat. Especially in the catalytic converter. usually a crank sensor results in no start but it affects the ignition timing. What are the exact codes?

Feb 22, 2014 | 2006 Subaru B9 Tribeca

1 Answer

P0017 code on a 2006 Rainier 4.2l


This means that your crankshaft and camshaft sensors are not in sync, meaning that your timing belt has jumped a tooth, so you are out of time.

Dec 04, 2013 | 2006 Buick Rainier

1 Answer

What does acam or crankshaft sensor do


  • The crankshaft position sensor identifies position of the crankshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
  • When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown.
  • The camshaft position sensor identifies position of the camshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
  • When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown
  • Jul 24, 2012 | Cars & Trucks

    2 Answers

    1997 dodge avenger 4 cylinder. The car been having some misfires, especially when it sat on the sun for some time. I was adviced to try to replace the crankshaft position sensor, I did and the problem went...


    It's a proximity switch so it shouldn't be subject to wear. Oil doesn't interfere with the working of the proximity switch. Check the contacts where the lead connects. Make sure the connector can't move with vibration.

    Mount the old switch again - when it's ok again for some time it's most likely the cabling not the sensor switch itself

    Jun 26, 2011 | 1997 Dodge Avenger

    1 Answer

    Looking for cylinder diagram/location on 2001 Ford Escape 6 cyl


    here's the scoop. There is a TSB that addresses this issue.
    First, replace the spark plugs.
    Next, replace all 6 COPS, coil on plug. You have to because they feed back into the PCM, Powertrain Control Module and blow the drivers. Then you need to replace the PCM.

    This was for 2004-06, but it might apply to yours if it's a 3.0L.
    buy at tascafordparts.com.

    Misfire DTC codes identify which cylinder is misfiring.

    Misfire Detection Monitor The Misfire Detection Monitor is an on-board strategy designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel metering, poor compression, or any other cause. The Misfire Detection Monitor will be enabled only when certain base engine conditions are first satisfied. Input from the ECT or CHT, MAF and CKP sensors is required to enable the monitor. The Misfire Detection Monitor is also performed during on demand self-test.
    1. The PCM synchronized ignition spark is based on information received from the CKP sensor. The CKP signal generated is also the main input used in determining cylinder misfire.
    1. The input signal generated by the CKP sensor is derived by sensing the passage of teeth from the crankshaft position wheel mounted on the end of the crankshaft.
    1. The input signal to the PCM is then used to calculate the time between CKP edges and also crankshaft rotational velocity and acceleration. By comparing the accelerations of each cylinder event, the power loss of each cylinder is determined. When the power loss of a particular cylinder is sufficiently less than a calibrated value and other criteria is met, then the suspect cylinder is determined to have misfired.
    1. Misfire type A:

      Upon detection of a Misfire type A (200 revolutions) which would cause catalyst damage, the MIL will blink once per second during the actual misfire, and a DTC will be stored.

      Misfire type B:

      Upon detection of a Misfire type B (1000 revolutions) which will exceed the emissions threshold or cause a vehicle to fail an inspection and maintenance tailpipe emissions test, the MIL will illuminate and a DTC will be stored.

      The DTC associated with multiple cylinder misfire for a Type A or Type B misfire is DTC P0300.

      The DTCs associated with an individual cylinder misfire for a Type A or Type B misfire are DTCs P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0309 and P0310.

    Dec 18, 2008 | 2001 Ford Escape

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