Strobelite wrote:Hmm , I didn't passed smog in my 86 until i changed the CAT after the second try, well that was after i did a tune up, changed the spark plug wire set, spark plugs, new oil, and seafoam and a new O2. on the first try ,it was boreder line close to passing. timing perhaps ?
Maybe I should seafoam too. Everything else you listed is new on mine too. But my stock exhaust mani was really loose on the downpipe last time. I just tightened it up as best I could but I might have to take it off the car to get it super tight.