Okay, here goes.

Have an 01 3.5L. Tried starting it after it sat awhile, and it ran, then ran very poorly, with the tach all over the place, gave a P1391 code bad cam/crank sensor (sweet code chrysler), we had just replaced the Crank sensor right before this. I did some research which said that aftermarket crank sensors are notoriously bad, and since the crank sensor should be the only input that would effect the tach signal, I went ahead and replaced it.

It started, ran, drove, then started the same thing, ran awful, have to play with the throttle just to keep it going. This time it gave 2 coil codes as well. So I replaced those coils, an it started right up! I drove it for about 8-10 minutes, until, I'm assuming it got into closed loop, then it started the same thing AGAIN!

So, even though I really doubted the cam sensor to be the problem, I went ahead and replaced it, It did look as if it were bad, so I started it. It ran, it missed twice, ran, then died.

I can't start it now at all.

I wanted to make sure the timing didn't jump. (I did just replace the timing belt only a few thousand miles, if that, ago) I pulled the plugs, which were coated in gas, and did a compression check. All the cylinders were between 150-160 psi. So timing should be good, and the tensioner should still be tight.

So, with all that being said, I don't see any reason why the 1391 code still sets, as it seems there is no reason for it to. Furthermore, I'm dumbfounded as to why it won't start at all now.

We had replaced the PCM about a year ago, and I'm thinking thats what the culprit is now. What say you guys?

Thanks.

 

oh, and I just tried cranking it with the CAM sensor unplugged, and the RPM's don't jump....don't quite understand that one either.

 

I have a 02 dodge intrepid i just rebuilt the engine. When i crank my car to start it takes me like a couple cranks before it starts. I think it might be the crankshaft positioning sensor but im not sure!

 

I cannot get an 8v signal out of the PCM from the cmp ckp power wire.

BUT!

it wouldn't start wouldn't start wouldn't start, then I pushed the t-pin in there a little harder, cranked it and it started better than it did in a long time!

But like clock work, after about 5 minutes, it started running poorly, then died. Won't start, anyone have any ideas?

 

I have a 04 intrepid... Will not start... Replaced both the camshaft position sensor and Crankshaft sensor... Still wont start... Car turns over but wont catch. Tested power to the top of motor with volt meter... seems to get charge when turning over.. fuses all good... check fuse box has power... changes alternator didn't help so i took it back. AS of now 2 days and I have no clue as to why the vehicle wont start.. all this the day I was going to take the vehicle for J18 recall <-------- crankshaft position sensor.

Things i checked.

Alternator
battery
Camshaft sensor
Crankshaft sensor.
power to coils.
power to come
Fuses
fuel
Belts
Can hear pump turn on<------- so doubt thats the issue
All fluids a ok.


Have the following codes

P0016 <----- replaced
P0700<---- tranny control mod
P0016 <--------- replaced
P00871<--- Trans Pressure sens

So no idea...

 

i have the same exact issues listed here replaced tps, iac, all six coils, cam/crank sensor and timing chain has been changed idk what to do now and im considering junking the car (2001 dodge intrepid) 2.7l.............
i had the car running perfect for about 10 minutes at 2 points but the next day the car didint work again

has any one found a solution to this?

also im new here and this is my first post so if im doing somthing wrong my bad

 

Any codes? You can try to unplug the map sensor plug and see if it starts (after a fail when its not starting or running like a pos). It will set a fault code but will put an average baro value so the car can run thru average speed/rpm. These sensors tend to stick and then the timing (which is computed with the map input) is out. After a while, the sensor frees up and then starts dine until it sticks again.

 

yea im getting the p1391 code, i would do as you suggest but it turns out the guy i was fixing it with scamed me out of 400 dollars of labor :/

but i can still use this for future refrence, so what does the map sensor actully do and how does it freeze up?

 

For future reference it's the mass air flow sensor... Prior to mention start it senses barometric pressure. When the engine is running it used to measure manifold vacuum. When they seize up internally the computer is given the wrong manifold vacuum and then the timing is miss-computed. While stuck, sometimes the engine can be started if you mash on the gas pedal. Many times the sticking is not detected so there will be no fault in memory. Only if the sensor opens or shorts out, does the computer usually detect a fault.

 

O-o that actully might have been it, o well thanks for the info buddy this should be a great refrence when dealing with similar problems