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  1. #1
    vettedude
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    Default *** temp sensor help??????????

    I have a 84 crossfire and I just noticed that my sensor on the (front) of the intake manifold...(2 wire)


    I noticed that BOTH wires had been spliced and twisted together

    The car has been like that for years with no problem

    can some body tell me what sensor it is ?

    And any ideas on why the wires were twisted together?

    If you twisted the wires together, what would it do?

  2. #2
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    Member djsroknrol's Avatar
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    Corvette(s)
    1984 L83/MD8 red coupe

    Default

    I just went through this in my car....that sensor is the coolant sensor that communicates with the ECM
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  3. #3
    vettedude
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    thanks

    So its a cooling sensor for the ecm.

    my car was running good with them twisted together

    Any ideas what happens if you twist them together, (anybody)////

    **thanks

  4. #4
    vettedude
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    Default

    hopefullly i can get some anwers

  5. #5
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    Default

    The coolant temp sensor is very important, it take the place of a choke on a carb'ed engine. When the coolant is cold, the sensor will have alot of resistence. The ecm sees this & adds fuel by increasing the injector pulse widths. When the coolant is hot, the resistence in the sensor is low telling the ecm to shorten the pulse widths. A hot engine will run on less gas then a cold one. The way your car is wired it should be hard to start unless you live where its very warm out, possibly it shouldn't run at all. You can up grade to a newer style sensor & connector as the one on your 84 is troublesome. I think the newer style came out in 85-86 up GMs.

  6. #6
    vettedude
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    im just going to stick a 640 resistor in place of the sensor

    the ecm will belive the engine is at 140 degrees

    the engine runs good now---we will see how she runs at 140 degrees

  7. #7
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    Default

    You might as well slap a carb on it then.

  8. #8
    vettedude
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    Default

    Quote Originally Posted by ex-x-fire View Post
    You might as well slap a carb on it then.
    slap one on yours/ tbi guru

    better yet, slap one on your momz 4.3 liter

    we saw what your engine looks like.......lol

  9. #9
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    Corvette(s)
    1982 collectors edition

    Default

    I just noticed this thread, Hope someone is still looking at it.

    For sure the temp sensor is nothing to fool with in my part.

    Mine was defected and it was running that rich that the

    catalytic convertor was orange hot on the pipe coming out of it.

    Not good.

  10. #10
    New Member
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    Jun 2011
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    Buhl, idaho
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    Corvette(s)
    1982 crossfire

    Default Exhaust tail pipe has soot buildup. What does it mean? How to fix? Advanced timing setting?

    Exhaust tail pipe has soot buildup. What does it mean? How to fix? Advanced timing setting?
    Quote Originally Posted by jimbil208 View Post
    I just noticed this thread, Hope someone is still looking at it.

    For sure the temp sensor is nothing to fool with in my part.

    Mine was defected and it was running that rich that the

    catalytic convertor was orange hot on the pipe coming out of it.

    Not good.

  11. #11
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    Default

    It probably is running rich, these injection systems are senstive vacuum leaks. I'd check all the hoses & grab the throttle linkages & see if there loose, a common problem.
    Check the coolant temp sensor, these have an early style connector thats been a problem. You can splice in a newer style connector & use the newer sensor.
    Check the grounds carefully, there are some usually at the back of the heads, these are for the ecm.
    Check your tune up parts, check ignition timing (follow the directions on emissions sticker), & make sure it advances when you rev it (after you hook the timing connector back up).
    When running the engine, look at the injectors, they should spray a fine mist, no drips, if there are drips then the injectors are dirty. There should be no drips after the engine is off.

  12. #12
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    1982 crossfire

    Default rich running motor

    Quote Originally Posted by ex-x-fire View Post
    It probably is running rich, these injection systems are senstive vacuum leaks. I'd check all the hoses & grab the throttle linkages & see if there loose, a common problem.
    Check the coolant temp sensor, these have an early style connector thats been a problem. You can splice in a newer style connector & use the newer sensor.
    Check the grounds carefully, there are some usually at the back of the heads, these are for the ecm.
    Check your tune up parts, check ignition timing (follow the directions on emissions sticker), & make sure it advances when you rev it (after you hook the timing connector back up).
    When running the engine, look at the injectors, they should spray a fine mist, no drips, if there are drips then the injectors are dirty. There should be no drips after the engine is off.
    I'm using this as a checklist. Takes me a week or so. I'll let you know Thanks

  13. #13
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    Dec 2001
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    Corvette(s)
    2001 Convertible

    Default

    Fix the CTS wireing and solder the wires. Using a fixed resistor will cause a rich fuel mixture and eventually destroy the enternals of you engine.

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