Hey guys this is off subject but I'm desperate for ideas. I've got a '91 Nissan Maxima with 100,000 + mi. Got an ECL right before I changed oil and did a tune up, went ahead and did them anyway just in case the light went away, it did'nt. Worse yet when I restarted the engine proceeded to knock like hell, like a rod wanted to let go. Repulled the plugs to see if they were to long, they were'nt. Someone suggested a piece of FOD might have fell into the cyl., so I pulled each plug and rotated to see if anything came out, nothing!!! Still knocks like hell, HHHHEEEEELLLPPPP !!!!