How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Wayne Crawford Your Own Question
Wayne Crawford
Wayne Crawford, Shop Owner
Category: Dodge
Satisfied Customers: 4017
Experience:  MO Safety/Emissions Certified on all makes and models with a strong electronics background aiding in electrical troubleshooting.
66997337
Type Your Dodge Question Here...
Wayne Crawford is online now
A new question is answered every 9 seconds

Ram 1500: what actually fixed this ?

Customer Question

I found the p1391 code on google and someone asked the same question as me and has replaced the same parts according to the codes as me. what actually fixed this ?

Submitted: 2 years ago.
Category: Dodge
Expert:  Wayne Crawford replied 2 years ago.
Hello. My name is ***** ***** I will be helping you today.I dont know what question you are looking at but if they reported a fix to us it would show in the question.Have you synced the system since replacing the parts you replaced?
Customer: replied 2 years ago.

I was looking on google and a it said ask me a question so I did.

Expert:  Wayne Crawford replied 2 years ago.
OK. You said you replaced the same parts as the other person. I assumed you read another question.But anyway have you synced the system?
Customer: replied 2 years ago.

yes my snap on scanner says it is synced at 0 deg

Expert:  Wayne Crawford replied 2 years ago.
You got a lab scope?
Customer: replied 2 years ago.

yes my modis ultra has one but ive only used once.

Expert:  Wayne Crawford replied 2 years ago.
That should have a 2 channel. Try scoping both the cam and crank sensor and watching them. See if the cam sensor rise is within the crank sensor rise.. if not adjust it to where it is then clear the codes and recheck. Sometimes 0 degrees doesnt work. It may be off a couple of degrees.
Customer: replied 2 years ago.

cam rise and crank rise? adjust the distrib?

Expert:  Wayne Crawford replied 2 years ago.
The upwards line on the graph.Yes adjust the distributor to where the cam rise falls within the crank rise.
Customer: replied 2 years ago.

ok, ill try it after lunch

Expert:  Wayne Crawford replied 2 years ago.
Alright. That should do it.. if not let me know and we can check further. Let me know if you need anything further and please be sure to rate my service so I get credit for it. The question will stay open for follow ups as long as needed even after you rate my service. Just reply to the same question to move on if needed.
Customer: replied 2 years ago.

ok about ready to check it. which wire is which for the test, I believe there are three wires on each sensor.

Expert:  Wayne Crawford replied 2 years ago.
Just a moment. Let me pull it back up.
Expert:  Wayne Crawford replied 2 years ago.
The tan/yellow wire at the cam sensor and grey/black at the crank sensor.
Customer: replied 2 years ago.

ok I hope this don't sound to dumb lol, but do I need to unplug them and check cranking or back probe them ? like I said I have done much drivability and that not my strong area.

Expert:  Wayne Crawford replied 2 years ago.
Your scope should have an inductive pickup on it that you clamp around the wire while its running to check the signal.
Customer: replied 2 years ago.

oh. I don't have that connector

Expert:  Wayne Crawford replied 2 years ago.
Then you will have to backprobe them.
Customer: replied 2 years ago.

ok.

Expert:  Wayne Crawford replied 2 years ago.
Let me know how it goes. I will be standing by.
Customer: replied 2 years ago.

ok. im trying get it checked by close, if not it`ll be Mon

Expert:  Wayne Crawford replied 2 years ago.
No rush on my end. Just please be sure to come back and rate my service at some point so I get credit for it.
Customer: replied 2 years ago.

yes sir.

Expert:  Wayne Crawford replied 2 years ago.
Thanks
Customer: replied 2 years ago.

ok I scoped them both and they pattern seems the same except one pattern is down and one is up but they are paralall with each other

Expert:  Wayne Crawford replied 2 years ago.
They should be going up at the same time with the cam sensor being just a hair behind the crank sensor.
Expert:  Wayne Crawford replied 2 years ago.
Did you put in a MOPAR crank sensor?
Customer: replied 2 years ago.

https://www.dropbox.com/s/9djsp810s0vrnyx/20150619_170302_HDR.jpg?dl=0

Expert:  Wayne Crawford replied 2 years ago.
Whichever one is channel 1 is not a very clean signal. It would appear to be an aftermarket sensor. Replace that with a mopar sensor and your issue will probably be solved.
Customer: replied 2 years ago.

that is the camp sensor signal

Expert:  Wayne Crawford replied 2 years ago.
Replace it with a mopar. These are very picky on a clean square wave signal. Honestly both of them would be replaced in my shop. Neither of them are very clean but the cam is the worse of the two. http://i.ytimg.com/vi/S-mQCieQWyg/maxresdefault.jpg look at the one in that picture. The bottom one is a clean square wave.
Expert:  Wayne Crawford replied 2 years ago.
On yours on channel 1 you can see where the lines are almost overlapping each other in some spots like its trying to go up and down at the same time.
Customer: replied 2 years ago.

did I have all the settings right on my scanner? like ms and other settings at the bottem ?

Expert:  Wayne Crawford replied 2 years ago.
Yeah that was all fine.
Expert:  Wayne Crawford replied 2 years ago.
Yeah that was all fine.