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Thread: 1uz cold starting

  1. #1
    Forum Member 1st year Apprentice
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    Default 1uz cold starting

    help i have a problem starting engine when cold temperate climate worst in the morning but after sitting for an hour still takes a few trys

  2. #2
    Forum Member 1st year Apprentice
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    Default Re: 1uz cold starting

    more specific info needed.
    hard to crank? or
    good cranking but no bang? or
    good crank good bang but no idle?

  3. #3
    Forum Member 1st year Apprentice
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    Default Re: 1uz cold starting

    Quote Originally Posted by rebuilder86 View Post
    more specific info needed.
    hard to crank? or
    good cranking but no bang? or
    good crank good bang but no idle?
    good cranking,,,, first i thought fuel pump fuel leaking back but today it was hot and it started up second go ///// do these have a cold start sensor mybe still on wrong track/////

  4. #4
    Learner Driver Backyard Mechanic
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    Default Re: 1uz cold starting

    Yes they do still have a brown thermo-time switch and a cold start injector, and like 99% of them, the thermo-time switch will be faulty.
    - KE70 Corolla Dx -
    - 500hp+ 7AGTE 20V turbo -
    - MRS/Hayabusa turbo **sold**
    - TA63 3TGTE project in the build -

  5. #5
    Forum Member 1st year Apprentice
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    Default Re: 1uz cold starting

    what do you mean cold start injector thanks

  6. #6
    Learner Driver Backyard Mechanic
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    Default Re: 1uz cold starting

    there is a single injector that operates only while cranking and cold,

    From google pictures it looks like it is in the center of the manifold underneath.

    It is controlled by a thermo-time switch, which looks like a large brown temp sensor.
    - KE70 Corolla Dx -
    - 500hp+ 7AGTE 20V turbo -
    - MRS/Hayabusa turbo **sold**
    - TA63 3TGTE project in the build -

  7. #7
    Forum Member 1st year Apprentice
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    Default Re: 1uz cold starting

    Quote Originally Posted by DX20VT View Post
    there is a single injector that operates only while cranking and cold,

    From google pictures it looks like it is in the center of the manifold underneath.

    It is controlled by a thermo-time switch, which looks like a large brown temp sensor.
    thanks heaps

  8. #8
    Forum Member 1st year Apprentice
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    Default Re: 1uz cold starting

    There is also a good chance that the cold start injector is bad. Since both the injector and thermoswitch are not exactly cheap, verify that you are getting current to the injector first while cranking over the engine. 2nd check the wire from the injector to the switch. If you have a VOM, the injector should read between 3 to 5 ohms and the thermo switch 10-5 on the first pin and about 6 ohms on the 2nd pin. If they check out within the resistance range then try cleaning the injector. [lots of cleaning injector stuff on-line] Just apply 12V to the injector while using carb/injector cleaner before replacing either of the parts. The kicker is finding a metric fine thread fitting that will screw into the cold start injector body. I used an old M/C float check valve and epoxied the cleaner straw into the center of the check valve body. Also inspect and clean the screen on the inlet side of the injector. Dave W7

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