Volkswagen - Jetta :: 1999 - Tapping Sound That Diminishes After Warm Up


Nov 12, 2015

Car & History:- 99 Jetta, 2.0 AEG engine, manual. 86,000 miles. Bought at 70,000 miles 3 years ago.- low oil warning once in 2013 maybe. since been using 5w-40 synthetic and used Ceratec additive once. Been doing regular oil changes.- replaced original fuel filter at 80,000 mi- gaskets have been going. Replaced thermostat and gasket. Replaced leaking oil cooler gasket. Valve cover gasket has been leaking for at least 1 year. Will replace.- Replaced timing belt, tensioner, water pump, and serpentine belt at 84,000 miles.- Flushed radiator at 84,000 miles.- All break rotors and pads at 80,000 miles- Replaced battery at 75,000 miles- Gas mileage: 26mpg

Problem:- the sound is similar to a tapping. This has been going on for a year or more.- very noticeable and loudest when cold- worse in the lower gears- diminishes once warmed up (5 minutes)- happens only under load - so 5th gear and letting off the gas pedal (coasting) it's not noticeable.- JUST TODAY: 20 degrees F, and wouldn't start on first try. Cranked for 6 seconds probably. Second time I turned the key, it started no problem.

Things of note:- By peaking behind the engine, it looks as though the oxygen sensor wire covering (pre cat) is getting a little frayed at one spot.- When I bought it I noticed new spark plug wires.

My thoughts:- Exhaust manifold gasket (to the head) is bad. So when it gets warm the bad gasket expands and stops the noise.- It's not the valve lifters because the noise goes away when warm and not really heard when gas pedal isn't engaged.- Replace the O2 sensor?

Attachments:- 3 audio files. I put my car under my hood and went for a drive. You can hear when I engage the clutch, the ticking sort of goes away. - Pictures of the frayed O2 sensor wire ...

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