I have a 98 240sx with a 2002 Camaro LS1 + cam + dual valve springs and many other suspension and handling goodies and has been running well with no problems of this nature for 2+ years. I drove to work, it was fine, turned it on to go somewhere and else, and this happened..
Problem is, the car, when cranked up, sounds like there is severe scraping/knocking (no codes thrown) that is matched with the rpm even at idle. This just started yesterday and i have had what i believe is a very small coolant leak that I have yet to diagnose...I have checked:
- o2 sensors
- MAF
- Fuel Filter
- Air Filter
- Oil pump (oil getting to the top of the heads)
- Plugs
One thing i have yet to try is fuel pressure bc I dont have a gauge, but I will get one soon.
Anyone have any ideas? Thanks in advance!