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New engines with a bunch of codes

Discussion in '1st Gen. Tacomas (1995-2004)' started by Auston, Oct 21, 2024.

  1. Nov 2, 2024 at 8:26 AM
    #21
    ripdawwg

    ripdawwg Well-Known Member

    Joined:
    Feb 11, 2013
    Member:
    #97323
    Messages:
    102
    Gender:
    Male
    First Name:
    Ryan
    Oregon
    Vehicle:
    2003 Tacoma
    O3 Tacoma. Manual hubs Bilstein 5100 in OME 885 springs. Rear Wheeler off road 5 leaf springs. Northwest trails innovation winch bumper & 10k winch. TRD rear elocker and front 7.5 truetrac limiter slip. Built 2.7 3rz, balanced, 1mm bored, 9.75-1 compression, LC cam, 1mm oversized valves, LC 35 lb flywheel & LC clutch, ported head, balance shaft delete, bored throttle body, header & 2.5” exhaust.
    After my rebuild I had the misfire codes on all cylinders @ first start up. Lots of assembly lube and atf in the cylinders and smoked like a WW2 destroyer fogging the beaches before the marines landed. Even after it warmed up it still had tail pipe smoke and idle was erratic until we took it on a run and did some pulls to seat the rings. Then I installed Amazon 02 sensors and that’s when I opened a can of worms. If you can get it warmed up you might be able to burn out most of the assembly oil still in the cylinders. Also be very careful and make sure your cooling system has burped all the air out in a few warm up and cool off cycles where the radiator draws coolant from the overflow bottle. It’s often difficult to burp the air pocket in these engines. Once you get it running make sure the overflow bottle is full each time then idle it up to temp then shut down and let it draw from the bottle. Have heater on full blast. Once you can feel heat after the 3-4th cycle use it up to 2000 rpm’s for a few minutes to fully push the air out of the cooling system then let cool with the bottle topped off once more. Do this BEFORE you take on a test run. You absolutely do not want to overheat your new engine. These cycles I just spoke of will allow you do crawl all over it like a proctologist to inspect for leaks and correct if you find any.

    Back to your issue. Inspect that you have the EFI temp sensor in the back of the head hooked up correctly. It will make the ECM go crazy if it’s not reading right.
     

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