Dnix Posted May 29 Share Posted May 29 1986 EFI 302. New, cat converter, plugs, wires, EGR,...... What can I do to help pass by a few? 3.20 min. Mine 4.16. Link to comment Share on other sites More sharing options...
85lebaront2 Posted May 29 Share Posted May 29 One I have heard from people I know in CA, fresh oil change, clean or new PCV valve, lean the idle a bit and retry. Other item that may help, your O2 sensor is at the back of the right exhaust manifold, meaning it only sees 1/2 of the engine. If you can go with a later exhaust system and a heated O2 sensor it will improve the mixture control. Link to comment Share on other sites More sharing options...
ckuske Posted May 29 Share Posted May 29 It might be good to make sure you don't have any codes in the computer as well that could cause emissions problems. Make sure the engine and the cats are good and hot before it is tested, also. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted May 29 Share Posted May 29 Is your truck one of the 302s that have the PCV in the rear driver side single runner? That can cause detonation in the cylinder and it can also blow all the oil through one piston instead of sharing it amongst all eight..... The mustang guys have a mod, where are the PCV goes to the plenum instead. If you get too much oil in one piston it will diesel and break out the top ringland or put a hole in that piston! Link to comment Share on other sites More sharing options...
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