5.4L PHASERS/VARIABLE VALVE TIMING technical question - Degš. Advance? - Ford Truck Enthusiasts Forums
Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Modular V8 (4.6L, 5.4L)
Sign In
Register Forgot Password?

5.4L PHASERS/VARIABLE VALVE TIMING technical question - Degš. Advance?

LinkBack Thread Tools Search this Thread
Old 05-10-2015, 12:09 PM
F150Torqued F150Torqued is offline
Junior User
Join Date: Jan 2015
Location: San Antonio, Texas
Posts: 72
F150Torqued is starting off with a positive reputation.
Question 5.4L PHASERS/VARIABLE VALVE TIMING technical question - Degš. Advance?

The PHASERS start out at one extreme position of NO RETARD, and are actuated only one in direction - toward a maximum RETARD.

The ECU achieves a desired (or requested) VALVE TIMING "RETARD" by applying a voltage (by duty cycle between 0 to 100%) to the VCT Solenoids.

With NO requested retard [no voltage (Zero duty cycle) is being applied to VCTs], the phaser "return spring", along with the VCT Solenoids routing oil into the proper PHASER chambers, the phaser vanes are pushed to the "DEFAULT" cam timing - or "ADVANCE" position. Another way to express it is, to the maximum "NO RETARD position". This is the relaxed, or engine off, or startup, and idle position. See image number four in these great photos: 5.4L cam phasers.. What goes bad? - Ford F150 Forum - Community of Ford Truck Fans

MY QUESTION IS: In this "DEFAULT" state or position, how many degrees "ADVANCE" is the camshaft actually at? I don't believe this unidirectional adjustment accommodates NO advance at all. I know some camshafts can actually be ground with a few degrees of advance - but I'm not asking about this. The question has to do strictly with actual camshaft positioning with respect to the crankshaft, either in "camshaft degrees" or "crankshaft degrees" (which is twice that of camshaft degrees) so long as I know which.

The Phaser design seems to provide maximum adjustment capability of about 35-38 camshaft degš, or 70-76 crankshaft degš. [[ 1/2 of each of 5 phaser chambers ((360š/5)/2) ]] See photos in above link?

REASON FOR QUESTION: I have identified and isolated four unpublished PIDs available from the ECU on my 2004 Ford 5.4L 3v that give real time operational data concerning the variable valve timing system. I have the parameters working on Custom PIDs and custom gauges to read these PIDs on the TORQUE PRO application. But, for one, being RETARD REQUESTED by the ECU (In Cks Degš), I need the proper "offset" (in degrees) for my formula to make the gauge accurately read camshaft position across the full range of ECU requested retard.

These unpublished parameter ID's are probably there for the FORD Dealership's diagnostic equipment, and as prevalent as problems are with phasers, I want to perfect my formulas. If someone can help answer this question, I will provide information for inputting these four Custom PIDs into the TORQUE PRO APP. If anyone is interested they are:
1) VCTENA - Conditions correct for Variable Valve Timing operation.
2) RCAM - Requested Cam Retard (in crankshaft degrees)
3) CAMDCR Commanded Duty Cycle for VCT Solenoid (in %)
4) CAMERRR VCT CAM Error (in Crankshaft Degrees) [[ plus or minus degrees that cams are OUT of sync with requested retard - this parameter "leads to" cam position DTC codes (P0011, P0012, P0021, and P0022).

Thanks for information any technical or engineer type can provide regarding "5.4L CAM ADVANCE in the default phaser position"
Reply With Quote
Old 05-10-2015, 12:09 PM

Similar Threads
Thread Thread Starter Forum Replies Last Post
05 5.4 p0012 code - need help diagnosing FoxNotch Super Duty & Heavy Duty 11 06-27-2015 06:39 PM
08 F-250 5.4 VVT Problem when warm parauto 2004 - 2008 F150 8 04-16-2013 10:27 AM
Help! 2008 F150 5.4 with error code P0022 AFMSgt2012 2004 - 2008 F150 0 08-06-2012 06:05 PM
2005 f150 5.4 v8 rough idle, cant figure it out patrick.sellers 2004 - 2008 F150 0 10-30-2011 11:50 AM
F150 5.4l VCT Trouble - how does it work? C F Industries 2004 - 2008 F150 11 05-04-2011 05:56 PM

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Modular V8 (4.6L, 5.4L)

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

All times are GMT -5. The time now is 01:08 PM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Terms of Service - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŪ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup