I rebuilt the engine in my 2003 6S, timing is all correct, tensioners are good and tight, new spark plugs and coils, piston rings and bearings, gaskets, etc.
It runs like it has a constant misfire, but no codes related to misfires. Only code is a pending P1410, because someone got rid of the stock airbox and put in a CAI. I can't even look at the fuel trims because the fuel system keeps switching between Closed Loop and Open Loop - Fault. Could that be an O2 sensor problem?
Anyway, I've been on this path of assuming my cats are clogged because the previous owner said it burned alot of oil. The front precat is new, and so far I've removed both main cats and welded in straight pipe, just to see if it would run better. It runs better than when I first started it, but still crappy. I'm going to do a leakdown test before I remove the rear firewall side precat, but it's like I'm tracking down ghosts.
Also another weird thing, it runs better above 2.5-3k rpms, but when I rev it that high it takes a few seconds for it to come back down. Almost like I'm still hitting the throttle but I'm not. Throttle body problem? Or related to the fuel issues?
I'm starting to regret buying this Mazda..
It runs like it has a constant misfire, but no codes related to misfires. Only code is a pending P1410, because someone got rid of the stock airbox and put in a CAI. I can't even look at the fuel trims because the fuel system keeps switching between Closed Loop and Open Loop - Fault. Could that be an O2 sensor problem?
Anyway, I've been on this path of assuming my cats are clogged because the previous owner said it burned alot of oil. The front precat is new, and so far I've removed both main cats and welded in straight pipe, just to see if it would run better. It runs better than when I first started it, but still crappy. I'm going to do a leakdown test before I remove the rear firewall side precat, but it's like I'm tracking down ghosts.
Also another weird thing, it runs better above 2.5-3k rpms, but when I rev it that high it takes a few seconds for it to come back down. Almost like I'm still hitting the throttle but I'm not. Throttle body problem? Or related to the fuel issues?
I'm starting to regret buying this Mazda..