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John
John, ASE Master Technician
Category: Audi
Satisfied Customers: 608
Experience:  ASE Certified Master Technician, ASE Certified Service Consultant, 22 years professional experience
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I have a 09 Audi A4 2.0 that sounds like diesel on the upper

Customer Question

I have a 09 Audi A4 2.0 that sounds like diesel on the upper end more toward cylinders #1& 2
Submitted: 1 year ago.
Category: Audi
Expert:  John replied 1 year ago.

Hello,

These engines have a mechanical 'high pressure' fuel pump in that area that is fed by the electric fuel pump in the fuel tank. The high pressure pump works off of a lobe on the camshaft. The is a lifter (I think they call it a tappet) between the action rod on the high pressure pump and the lobe on the cam. What usually happens is the lifter wears out and the noise comes from the excessive play between the cam lobe and the lifter. If left un-fixed the cam may become damaged.

Let me know if this explanation suits your needs, if not, let me know and I will get you the information you need.

Thanks, John

Customer: replied 1 year ago.
The HP pump and lifter are fine as we replaced the chain, guides and tensioner also replaced the camshaft bracket as the screen was missing along with the intake cam. the noise is most pronounced from cyl # *****&2 if you touch the solenoids on cyl #1 you can feel the nosie we swapped the solenoids with cyl 2 and it remained with cyl 1
Expert:  John replied 1 year ago.

Okay, I didn't realize you had already been into it. Which solenoids are you are you feeling the noise in? Any codes setting?

Customer: replied 1 year ago.
no code set the solenoids are the ones mounted on the passanger side of the valve cover a pair per cylinder
Expert:  John replied 1 year ago.

Okay, so we are talking about the cam adjustment (cam shift) actuators for cylinder #1, correct?

Since the noise stayed there then I am thinking the problem is in the lifters. The fact that the screen was missing makes me think it was removed to improve oil supply from sludging. Since you had it apart and didn't notice any visible damage then I would think this also points to the lifters. If the noise was not there before they they could have lost oil and just collapsed. I will keep thinking about it, let me know what you find.

Expert:  John replied 1 year ago.

Just following up on what you found.

Customer: replied 1 year ago.
The lifters corrected the condition thank you
Expert:  John replied 1 year ago.

Great! Glad we got it fixed.

Please don't forget to rate my responses. I only get paid if I receive positive feedback.

Expert:  John replied 1 year ago.

Just following up. I see that you have not given me positive feedback for my responses. Is there something more that you require? Sounds like that was the fix so if there is nothing else, please rate me with positive feedback so I will receive pay for my time.

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