help trouble shoot

[burt ragio]

Few months back I acquired a 2004 marauder with 46000 miles all stock no mods. I have a very faint valve train noise under acceleration. Almost like low octane bad gas or to much timing. I then started to try to remedying the problem. Fresh tank of 93 octane. Changed spark plugs gas filter cleaning mass airflow sensor. Valve train noise is still present under acceleration. I did notice while changing the spark plugs all four plugs on right bank were wet. All on opposite bank were normal.
Should I change oxygen sensors ? What step should I take next ?
__________________

[03Merc]

Post a video of the noise.


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[Mike D Mechanic]

Might want to pull the valve cover on wet side and bar it over to check cam timing or video scope it to check as to weather or not the cams are running late after you have exhausted the easy causes . good luck with your engine.

[justbob]

Wet with oil or gas?


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[burt ragio]

The plugs were Wet with gas. Tried to take an audio of valve train noise but it is barely audible. Very faint.

[Zack]

Every MM i've ever had makes a valvetrain noise at about 1800rpms

[1Marauder]

Every MM i've ever had makes a valvetrain noise at about 1800rpms

Good to know... I've heard a faint metal murmur. Will check RPMs.

[RF Overlord]

Are there any other driveability symptoms?

[burt ragio]

Every MM i've ever had makes a valvetrain noise at about 1800rpms

True also remember years ago you made an adjustment in a tune for this. I think this is something different.
Do we have cam positioning sensors ?

[RF Overlord]

Do we have cam positioning sensors ?Yes, mounted in the front cover on the driver's side.

[burt ragio]

Are there any other driveability symptoms?

No drive issues. But before I changed the plugs I sometimes attempted to start the car it would stumble & start & stall. I also experienced the valve train noise. Not knowing the previous owner & maintenance I thought best having 54,000 mile why not change gas & air filters & install new plugs. What has me concerned is one entire bank of spark plugs were wet with gas the other side was dry.

[burt ragio]

Is there a right & left side valve sensor ?
Do these sensors control advance or retard of cams ?

[DrZ]

Change all COP coil on plugs to Motorcraft DG-543 and new motorcraft plugs 433

[DrZ]

Also check spark plug cover gasket and aluminum cover
for moisture or condensation.

[Turbov6Bryan]

Is there a right & left side valve sensor ?
Do these sensors control advance or retard of cams ?

Ummm. These 4.6 are not VVT

They do not have variable valve timing like the coyote

Cam sensor is on drivers side

[RF Overlord]

Is there a right & left side valve sensor ? No, just the one.

Do these sensors control advance or retard of cams ?No, it provides a timing signal to the PCM for firing the injectors.

[burt ragio]

So if the cam sensor only provides a signal for firing of the fuel injectors this means I need to look in another direction.
I doubt the problem lies with all four coils on one bank as mentioned in a previous post..
Any other suggestions ?

[Turbov6Bryan]

So if the cam sensor only provides a signal for firing of the fuel injectors this means I need to look in another direction.
I doubt the problem lies with all four coils on one bank as mentioned in a previous post..
Any other suggestions ?

If it's running and driving fine, those injectors may be bleeding off fuel pressure once the car is shut off? Put a gauge on the rail, does the rail hold pressure once shut off?

I wouldn't worry about faint noise, these motors are not quiet

Still no video?

[burt ragio]

When the motor is shut off doesn't the fuel pressure sensor shut off gas flow completely to the injectors ?

[Turbov6Bryan]

When the motor is shut off doesn't the fuel pressure sensor shut off gas flow completely to the injectors ?

If the injectors are dirty, they can bleed off pressure.. getting the plugs wet


. if you put a gauge on it, and the pressure drops off quick, it can be pump or injectors..

The pressure sensor does not shut off the gas like a faucet, it just maintains pressure electronically

The injectors are on off valves, if they stick open you lose pressure and get wet plugs

I don't think anything is wrong with your car... put NGK plugs in it and drive it

[RF Overlord]

A sticky/dirty injector I can believe, or even a couple, but all 4 and only on one side? Absent any codes or driveability issues, I'm at a loss. Can you get a code scanner on it and see what the short- and long-term fuel trims are?

I do second the NGKs, though.

[Turbov6Bryan]

A sticky/dirty injector I can believe, or even a couple, but all 4 and only on one side? Absent any codes or driveability issues, I'm at a loss. Can you get a code scanner on it and see what the short- and long-term fuel trims are?

I do second the NGKs, though.

What's hilarious is he has a slight tick in the motor, comes up with wet plugs...

I've seen plenty cars with egr gaskets doing damage to injector harnesses and causing a wiring mess, adding voltage to or even burning a injector

Take it to a professional

Trying to help people fix their cars when they know nothing is futile

[burt ragio]

As you can see in one of my previous posts I do ave new plus NGK 4177 tr6 gap @45. I have no dash lights or codes. I will get a gauge to hook up to fuel rail & see if it holds pressure. Maybe I am chasing nothing. I just want to be sure all is good before I start having some fun with the go pedal. Thanks for your patients.

[RF Overlord]

My only other thought was if the O2 on that side were bad, but then you should have a CEL. That's why I mentioned checking the fuel trims.

[burt ragio]

Just a hypothetical, What would the symptoms be if on one cylinder head right or left bank one of the two cams was just off by one tooth or the sprockets were not properly aligned ?