Mechanics

I GET A CODE P0306 OR P0303 AND HAVE A CMP

1996 Ford Taurus

Engine Performance problem
1996 Ford Taurus 6 cyl Front Wheel Drive Automatic 123400 miles

I just replace the cyl. Heads and took the engine out of car. Replace must of the parts that need it to be replace. I did something that I was not supposed to touch. I loosened up the camshaft Position Sensor (CMP) but never took it out. I put the engine back on and got code P0303, then we tried to align the sensor to 38 degrees as instructed on the Haynes Repair Manual and got code P0306. We are going to be testing the sensor it self to see if it is faulty. We tried to move the sensor a couple of degrees left and right and we sometimes changed it to either of both codes that were gotten before. When we moved the CMP to the left getting less than 38 degrees we got code P0303 and the closer we were to the CMP or the greater we went from 38 degrees we got P0306. We, as said before, never took out the CMP but simply loosened it. Before we got the car, the owners of before us had the car tested, and was also given a miss fire code, do not remember the actual code. Please advise for the right degrees for the position of sensor, because we were given information that it was supposed to be 75 degrees instead of 38 degrees autozone repair manuals site. Thank you.
Avatar
Dmorazan
December 28, 2008.




I'm guessing you loosend the synchroniser ? it needs setting @75 degrees .. the actual sensor itself can be removed/loosened without the problems of setting up afterwards ... it could be the sensor itself needs relacing causing the misfire codes .. let me know

Camshaft Position (CMP) Sensor
EEC-V uses 2 types of CMP sensors. A variable reluctance sensor is used.
CMP sensor is used to determine the position of the camshaft and to identify when piston No. 1 is at TDC of compression stroke. CMP sensor provides cylinder identification information during engine start-up for PCM to initiate correct firing order. Cylinder identification information signal is sent from CMP sensor to PCM through CID circuit.

CAMSHAFT POSITION SENSOR
Removal & Installation (OHV)
Disconnect negative battery cable. Unplug harness connector from Camshaft Position (CMP) sensor. Remove CMP sensor mounting screws and sensor. To install, reverse removal procedure. Tighten mounting screws to specification. See TORQUE SPECIFICATIONS . For CMP sensor synchronizer removal and installation procedure, see CMP SYNCHRONIZER .
Removal & Installation (DOHC)
Disconnect negative battery cable. Disconnect CMP sensor harness connector. Remove CMP sensor retaining screw and CMP sensor. See Fig. 5 . Ensure "O" ring is properly located and in good condition. To install, reverse removal procedure. Tighten screws to specification. See TORQUE SPECIFICATIONS .
Fig. 5: Removing CMP Sensor (DOHC)
Courtesy of FORD MOTOR CO.
CMP SYNCHRONIZER
Removal (OHV)
Note position of CMP sensor electrical connector. Remove CMP sensor. See CAMSHAFT POSITION SENSOR . Before removing synchronizer housing, set piston No. 1 to Top Dead Center (TDC).
Apply reference marks on synchronizer housing and engine. Remove synchronizer housing hold-down bolt and clamp. Remove synchronizer assembly with intermediate shaft.
Installation
Install Synchro Positioner (T95T-12200-A) on synchronizer assembly (CMP sensor removed). Turn synchronizer shaft clockwise until tool boss engages with notch in synchronizer housing. Tool should fit squarely in top of synchronizer housing.
Install intermediate shaft in synchronizer assembly. Lubricate synchronizer drive gear with engine oil. Insert synchronizer assembly into engine. While inserting, synchronizer assembly will rotate. When installed, synchro positioner should point 75 degrees from engine centerline. See Fig. 6 .
If synchro positioner is not pointing in correct direction, remove synchronizer assembly and start again from step 1). If installed correctly, install and tighten hold-down clamp and remove synchro positioner.
Install CMP sensor and tighten screws to specification. See TORQUE SPECIFICATIONS . Connect CMP sensor harness connector and negative battery cable.
Fig. 6: Positioning Synchronizer For Installation (OHV)


http://www.2carpros.com/forum/automotive_pictures/266999_cmp_1.jpg


Dave H
Dec 28, 2008.
You mean replacing not relacing?
AD

Tiny
Dmorazan
Dec 28, 2008.
The codes you are getting are just misfire codes they could be from plugs/wires/coil/CKP/CMP. Generally (but not alway's) the PCM will pick up on a fault from the CMP and give a code from the CMP. I would be double checking my timing before replacing any part's it could be that slight little degree out? Causing the misfire. If you definately feel it is the cam sensor you could just replace it or reset the synchronizer to 75 degrees

Dave H
Dec 29, 2008.
I just change the CMP with a new one and is doing the same, about the wire, spark plug and injector they all have been checked and how I did it was that I swap the wire, etc with other piston and got the same result. Now about the 75 degrees, we are using a degree ruler and I do not think that it will go 75. Look I m a electrician by trade and I m not saying that I know every thing but I know measures and degrees and if you turn it all the way up it goes close to 65 to 70 only. Once again in the Haynes repair manual states 38 degrees please advise. And thank you

Tiny
Dmorazan
Dec 29, 2008.
I never advised you to change the CMP ... I advised against changing any parts untill you had double checked the timing ? have you checked your timing marks are spot on ? the special tool setup states it needs to be @ 75 degrees from centre line of engine as shown in the diagram

CMP SYNCHRONIZER
Removal (OHV)
Note position of CMP sensor electrical connector. Remove CMP sensor. See CAMSHAFT POSITION SENSOR . Before removing synchronizer housing, set piston No. 1 to Top Dead Center (TDC).
Apply reference marks on synchronizer housing and engine. Remove synchronizer housing hold-down bolt and clamp. Remove synchronizer assembly with intermediate shaft.
Installation
Install Synchro Positioner (T95T-12200-A) on synchronizer assembly (CMP sensor removed). Turn synchronizer shaft clockwise until tool boss engages with notch in synchronizer housing. Tool should fit squarely in top of synchronizer housing.
Install intermediate shaft in synchronizer assembly. Lubricate synchronizer drive gear with engine oil. Insert synchronizer assembly into engine.
*****************************************
********* While inserting, synchronizer assembly will rotate. When installed, synchro positioner should point 75 degrees from engine centerline. See Fig. 6 .


http://www.2carpros.com/forum/automotive_pictures/266999_sync_1.jpg


*****************************************
If synchro positioner is not pointing in correct direction, remove synchronizer assembly and start again from step 1). If installed correctly, install and tighten hold-down clamp and remove synchro positioner.
Install CMP sensor and tighten screws to specification. See TORQUE SPECIFICATIONS . Connect CMP sensor harness connector and negative battery cable.
Fig. 6: Positioning Synchronizer For Installation (OHV)

Dave H
Dec 29, 2008.
Thanks for the advice, what do you mean by timing marks. Do you mean put at DTC and check that or use a timing light or the synchroniser I t self is out and I have to take it out and reinstalled it. Please explain about the timing marks and how to do that and wee can I get that tool at?

Tiny
Dmorazan
Dec 29, 2008.
You must have had the chain off to remove the heads .. are you sure the timing chain marks are lined up correctly ?


http://www.2carpros.com/forum/automotive_pictures/266999_timing_2.jpg


Dave H
Dec 29, 2008.
Yes for sure I checked this before I closed every thing and once again this P03000 was there before I got the car and you do not have to take the chain off to do this heads. What can I do?

Tiny
Dmorazan
Dec 29, 2008.
No you don't have to remove the chain? I was asking have you checked the marks? A PO300 code is random multiple misfire. Random as in. ALL or some cylinders in an engine cycle. If you are sure the timing marks for the chain are lined up . Ther next thing you need to do is get the synchronizer back in position? I don't understand how you were getting you 38 degrees reading from the centreline of engine with a ruler?

Dave H
Dec 29, 2008.
Well I try to set a center line in the middle of the cmp and then put the ruler on top with the 38 degrees marker and if you look at the car it is kind of impossible to do the 75 degrees because the connector hits the or were the wiring plugs in hits the side of the intake manifold. Is kind of late but I will take some pictures of it for you to see what I see. I also went to the junk yard to see or look at the same cars and look at he position of the syncroniser and must were about the 38 degrees, and why the manual that I have teels me 38 and other ones 75 kind of weird well see iif you can dig out some more for me I will deposit or make a donation to the site soon and thanks or tell me what you think.

Tiny
Dmorazan
Dec 29, 2008.

AD