After resolving all previously posted issues, it was time to hit the road. It road smooth and the engine was humming. After 30 mins of driving the oil light came on and a loud ticking noise started in the engine. LOUD. There has always been a barely noticeable ticking noise from the engine but nothing like this. Despite oil light, No oil loss detected. Sounded like an exhaust leak near manifold. No exhaust leak. I checked the plugs because it almost sounds like a loose plug ticking. No plug issue. The noise seems to come from the under the valve cover. When I am underneath the D-90 the noise is loudest toward the firewall. The noise matches the engine at idle and after revving the engine.
Fault codes are P0300, P1316, 1317. Of course the check engine light was on prior. (I usually reset that as needed so disregard). The P0300 code was unusual. Never had an issue with the engine EVER... and I have had the 1997 NAS since 1999! A while back I researched the earlier ticking noise and the piston rod/rockers were suggested as a possible cause.
What say the forum?
------ Follow up post added June 26th, 2015 06:43 PM ------
clip with noise https://youtu.be/vL-1Ae8U77A
Fault codes are P0300, P1316, 1317. Of course the check engine light was on prior. (I usually reset that as needed so disregard). The P0300 code was unusual. Never had an issue with the engine EVER... and I have had the 1997 NAS since 1999! A while back I researched the earlier ticking noise and the piston rod/rockers were suggested as a possible cause.
What say the forum?
------ Follow up post added June 26th, 2015 06:43 PM ------
clip with noise https://youtu.be/vL-1Ae8U77A