Originally Posted by jbarnes1959
Ok Ranger folks---Here is the problem. My Ranger gives a code of PO1336 only when at a high rate of speed----65-75 Mph. I have changed both sensors--the truck does not shimming or shutter at 75 Mph. My next thing to do is to change out the PCM or harmonic balancer---any suggestions--I've spent several hundred dollars already. Even took it to the dealership and they gave me the runaround. One "expert" mechanic said not to worry about it. I reset the code and it doesn't reappear until I do a high rate of speed
I suggest starting a thread of your own, confirm the code your getting.
Post the year of your ranger engine size and transmission plus trim level
There is P codes and PO codes, PO codes that I know of do not have a PO1336 there is a P1336 ( correct me if I am wrong )
To diagnose this problem you will need access to the Factory Pin point test associated with the code you are getting.
Be careful when using the Factory pin point test because they can easily cause you to go down the the wrong path.
Make sure to search any relevant TSBs first because these pin point test
get updated and will not show up under the original Pin Point test but may show up under a TSB.
If you do not start with the correct information and test procedures, this can lead to a waste of time and money.
BTW these pin point test are meant for qualified knowledgeable technicians with the correct tools and equipment.
Even if you do not find an update to the Pin point test the test procedures can be wrong.
While working at GM and Mitsubishi dealerships I have found many incorrect test procedures that would have led a untrained
person to replace expensive parts for no reason.
Most of these mistakes in the manual and pin point test are caught and reported to the factory which is the reason for many service and test procedures having a TSB in the first place. yet many mistakes get overlooked and never reported which can lead to the confusion.
My point is while working with the Pin Point test if you come across something that you know is wrong or suspect is wrong and is leading you down a path where an expensive part may be replaced go with your gut and knowledge resisting the urge to replace that part.
An example of this was on a brand new at the time 2002 Mitsubishi Montero that came in off the car Carrier DOA.
The Pin point test was trying to tell me that if I did not have voltage to a certain pin on the PCM I was supposed to replace the PCM
yet it was obvious the relay the fed the power to this pin was defective not the PCM
I reported the error to Mitsubishi their engineers confirmed the error and about a month later a TSB was released yet this information was too late to make it into the Pin Point test.
Reporting this error cost me time and money and I received nothing for taking my time to report it.
Which is why many Dealer technicians that discover these errors never report them.