Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









fault code p1391


  Email This Post



two8pts
New User

Dec 22, 2005, 6:19 AM

Post #1 of 3 (28509 views)
Shortcut
post icon fault code p1391 Sign In

i have a 1999 dodge dakota 6 cylinder. i got fault p1391 about 2 weeks ago. hooked computer to it said tune-up. did spark plugs, wires, dist cap, rotor and pcv valve. truck still keeps giving fault and runs like it is dying after about 5 to 7 miles in the morning. it runs like it is missing 2 or 3 cylinders...backfiring and choking to death. if i stop and let it sit for 10 to 15 minutes it will run fine until the next morning. help please anyone.....
update.....i have found the fault code descrition.....it says intermitant loss of camshaft or crankshaft sensor....i am going to try that. will be back if does not fix the problem....


(This post was edited by two8pts on Dec 22, 2005, 1:27 PM)


DanD
Veteran / Moderator
DanD profile image

Dec 22, 2005, 1:36 PM

Post #2 of 3 (28489 views)
Shortcut
Re: fault code p1391 [In reply to] Sign In

I don’t know where you got the idea that a code P1391 means you need to tune your truck up, because this code stands for intermittent loss of camshaft or crankshaft position sensor signal. Which has nothing to do with the secondary ignition system (plugs, wires, cap and rotor) I’m not saying the truck didn’t need a tune-up and it never hurts anyway, if it hadn’t had one in a while.
As for diagnosing whether it’s in the wiring, sensors or the computer you almost need an oscilloscope connected to either circuit. That’s so you can watch the wave form pattern coming off of the sensors. This is while the engine is running and doing its thing, in the hope of seeing a glitch in the pattern.
Short of that it’ll be a complete guess as to what or who is causing the problem. I’m going to suggest taking the truck in and have someone figure this one out for you.
If you’re starting to think of changing the cam sensor yourself, be careful because you need a scan tool to synchronize it to the rest of the ignition system.
Dan.

Canadian "EH"






two8pts
New User

Dec 23, 2005, 5:40 PM

Post #3 of 3 (28477 views)
Shortcut
Re: fault code p1391 [In reply to] Sign In

the guy at advance auto told me that code p1391 was for tune-up which it is not...i know now. i changed the crankshaft sensor yesterday and it appears to have fixed the problem. thank you for your response.




Advertising


  Email This Post
 
 






Latest Forum Post

Hey people, Just as soon as I've got rid of one car and got another, I've got a...


I apologize I have not got a lot of time in it so far, so I do not have a lot of...


I have a 1992 ford ranger 3.0l v6 5 speed. today i ran out of gas and when i got...


Hello I have a 1993 Toyota Corolla w/1.8L and 3 sp +overdrive tranny. I took it ...


2008 Nissan Sentra 2.0 50000 Miles The trunk wouldn't open neither with the rem...


on a 1998 Chrysler cirrus the heater blows warm thru the vents. When u turn it o...


Feed Button






Automotive Forum Categories
AC Auto Repair
Auto Body Repair
Auto Insurance
Automotive Repair
Automotive Wiring
Automotive World
Brake Systems
Car Care Tips
Car Racing
Car Shows and Events
Car Stereo Repair
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair
Gasoline and Motor Oils
General Discussions
Motor Vehicle Inspection
Motorcycle ATV Repairs
Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Repair
Motorcycle Seat Repair
Remote Control Cars
Steering and Suspension
The Bargin Bin
Traffic Ticket Help
Tricks of the Trade
Truck Repair
Truck Repair Advice
Truck Engine Repair
Truck Suspension Repair
Car Forum - Sitemap


Search for (options) Privacy