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2010 Lincoln navigator: it is stuttering and surging while accelerating. Spark plugs/wires/ignition coils/throttle valve body replaced recently with no positive results.


I believe this is a "cam phaser" motor. Web search for these problems. There was a recall on engines like this. A quick explanation is that "cam phasers" are used to time the valves on each cylinder head. Most engines use solid timing chains, but these engines use phasers in-between.

The problem is when the phasers do not adjust each cylinder head equally. They are suppose to. It can be an expensive problem to fix. You might try Marvel mystery oil or risolone to clean the oil passages.

Jul 27, 2017 | Lincoln Navigator Cars & Trucks

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Understanding Variable Camshaft Timing (VCT)


Variable Camshaft Timing
With all of the gadgets on cars today, most of us find enough to boggle our minds inside of the passenger compartment let alone what's under the hood. Recently, many manufacturers have moved torward VCT's to improve performance, emissions and to eliminate other components. Let's start with the EGR valve or exhaust gas recirculation system. By installing a variable camshaft system on the exhaust camshaft, the manufacturers were able to eliminate the EGR valve, save money, and lower emissions.

VCT's have been installed on exhaust cams, intake cams, both cams and single overhead cams. The system is operated by using engine oil pressure to move a phaser that is mounted to the end of the camshaft and adjusts the camshaft timing while the engine is running. This is a brilliant system and the performance gained is amazing. The oil that is pressurized by the oil pump moves through oil channels to a solenoid that is controlled by the vehicles computer. The computer takes input signals from various sensors, processes the information and sends a signal to the solenoid that operates the cam phaser and in turn, adjusts the camshaft as needed.

How can I keep my variable camshaft system in good working order?
The best way to keep your VCT system is good condition is to perform regular oil changes and use a factory approved oil filter. Use of an aftermarket filter that is not factory approved can damage your engine. The material that makes up the internal portion of the filter must meet strict guidelines to assure that the material doesn't break away and enter the engines oil channels. This could block the oils path to the camshaft phaser and cause conditions such as rough running, noise and poor emissions/fuel economy. Dirty oil is a VCT's worse enemy. A few dollars extra can save thousands in repairs.

on Apr 12, 2011 | Ford F Cars & Trucks

1 Answer

Lifter replacement 5.4L


I must mention that engines with the DOHC emblem had a problem with "Cam Phasers". These would rattle and knock very similar to a Diesel and the noise would fade at about 2000RPM.

This engine has 2 timing chains. Since the Camshafts are on top, the lifters are under the cam. You would need to remove the cam to access the lifters. You will need to keep the cam gear positioned or lose the mark. There are cheater tools which allow you to sneak the cam gear away from the head to change the Cam phasers.

The cam phasers can then be removed. This is perhaps as much as you need done. I retired before this style of engine was built, so I can not tell you if the Camshafts can slide forward to be removed once you remove the Phasers and gear. Otherwise you are looking at a full frontal disassembly, just the Cam Phasers alone required full frontal disassembly in the original Service Manual.

You can read more about this engine and find Videos on the Web. I have an Engineering print but an assembled engine may have clearance issues. Wish I could be of more help, but you can get quite a rattle from the Phaser issues. Don't blame the wrong part.

Mar 24, 2014 | 2007 Lincoln Navigator Ultimate 4x4

1 Answer

Help fix my truck please


Several things come to mind. Usually failsafe has something to do with overheating or a temperature sensor falsely thinking the engine is overheating.
Another problem is a part called a "Cam Phaser". It would account for stalling, no power, no acceleration and not idling right. It is not an electronic part. Do an internet search for the part and read the results.
Because the "cam phaser" is not electrical, it is not directly identified by the onboard computer. The effects of the malfunction could possibly have other electrical parts trigger the "fail safe". As for part of the problem temporarily leaving after the battery was disconnected, it is common when power is removed.
Briefly, the cam phaser mechanically advances cam timing, but each side of the engine has its own phaser. Problems result when both phasers do not work equally.

Please rate my info.

May 12, 2013 | 2005 Ford Expedition

1 Answer

My 2005 F150 will not stay running when I slow to a stop or near stop. Where should I look first?


I do not see that the "check engine" light is on. There are some known problems around the 2004-2005 Models that are called "Cam Phasers".

These parts are in the Ford 4.6L and 5.4L V-8's. Basically, each half of the engine has its' own camshaft and Phaser. By using oil pressure, these Phasers are suppose to contract and expand uniformally to sync the valve timing. But one side or the other may get dirty. This means the timing on one side of the engine is different than the other. In essence the engine is binding up internally and that is why it stalls at low RPM.

You need to see a Ford Dealer about testing this defect. For a time, Warranty was extended to about 7 Years and ? number of miles. Even the shortcuts to this repair are expensive.

There can be other causes for your problem of stalling. The ISC solenoid/motor in the Intake manifold could be dirty and jamming. But your possible defects are limited by the lack of a "check light" so the problem would have to be in things the check light does not monitor. A dirty fuel filter, low fuel pressure, a vacuum leak, are the types of unmonitored things that can cause stalling.

I hope my solution is helpful. If your truck engine sounds like a Diesel below 2000 RPM and then gets quiet at higher rpm, it points to Cam Phasers.

Please rate my solution and I hope it is helpful.

Oct 22, 2012 | 2005 Ford F-150

1 Answer

I REPLACE CAM PHASER ON F 150 2004 5.4 ENGINE MY TIMING IS OFF DO IHAVE TO PULL THE FROM COVER OR THE TIMING CAN SET WITH COMPUTER?


if these are like the sable systems were there are 2 components to the phaser then you may have to replace the other part,and these need to be timed to each other with a tool to time correctly.just by changing the phaser will not throw out the time chain and gears as long as these are in good shape.

Jul 17, 2011 | 2004 Ford F150

1 Answer

2004 f150 5.4 liter has rough idle and when i punch it it sputters and pops through intake and boggs badly. do i need to check vacum problem first. then what


Check for a Vacuum leak, Then go to Autozone or Oreillys for a free scan. You did not mention any other noises, but if you have something like a light "tap" similar to a Diesel, see if that noise goes away above 2000RPM. The engines with the DOHC emblem have a problem with "Cam Phasers" and Ford has an extended Warranty for that defect. 7 years plus limited miles, at least 75,000 to 85,000.

The popping through the Intake sounds like early valve timing. The Phasers are used to synchronize the valves on each cylinder bank. One bank may be "out of time". The repairs are expensive, but some shops have found shortcuts for replacement. The 2 Phasers alone total $500.

I hope your troubles are small. With the DOHC motors it is important to keep the oil clean and consider using a Detergent additive to protect the Phasers.

Oct 14, 2010 | Ford F-150 Cars & Trucks

2 Answers

What dose a cam phaser sound like and wear dose the sound come form . on a 2005 ford f150 fx4


The cam phaser I would say wounds most like lifter noise from a 70s car, that ticking noise. At least the really loud cam phasers do sound like that. Some are not quite so noisy. My '06 has a bit of that ticking lifter type noise to it.,

Jan 10, 2010 | 2005 Ford F-150

1 Answer

2006 F-150 4X4 5.4ldr with a problem starting.


HI, I KNOW THESE ENGINES GOOD! I HOPE YOU HAVE BEEN USING A FL820 MOTORCRAFT OIL FILTER AND 5/20 OIL. IF NOT YOU MAY HAVE A PROBLEM WITH CAM PHASER'S AND OR TENSIONER'S. THR ENGINE IS A SINGLE OVERHEAD CAM ENGINE WITH VARIABLE CAM TIMING. I HAVE SEEN SEVERAL ENGINES WITH BAD CAM PHASER'S SIMPLY BY ADDING AFTERMARKET FILTER WHICH FALL APART INTERNALLY AND PLUG OIL GALLEYS TO HEAD AND CAUSE CAM PHASER'S TO ACT LIKE YOU'RE ENGINE IS RUNNING RETARTED UNTIL 2K RPM. IF NO NOISE IS HEARD TRY A FUEL PUMP ITS DRAINING DOWN AND COLD STARTS IT'S LIKE LACK OF ADEQUATE FUEL PRESSURE TO INJECTORS. IT'S REALLY SIMPLE. THESE TRUCKS WILL BE YOU'RE BEST FRIEND IF YOU USE AND FORD FILTER AND THE RIGHT OIL AND CHEVRON 87 OCTANE DUE TO THE INJECTOR'S CAN LEAK WITH CHEAP FUEL AND RUN LIKE ****. CHEVRON FOUND TO HAVE ADDITIVE TO KEEP INJECTORS CLEAN AND FUEL SENDER FROM BUILDING SULFUR AND READING FUEL LEVEL IMPROPERLY. HOPE THIS HELPS

Jul 13, 2009 | 2006 Ford F-150

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