anouther chevy 305 prblem
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5.0 and 5.7 Discussion, anouther chevy 305 prblem in Cadillac Engine Technical Discussion; i just got an 86 c-10 truck with a 305 it seams to run good the guages say it has ...
  1. #1
    seth is offline Cadillac Owners Member
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    anouther chevy 305 prblem

    i just got an 86 c-10 truck with a 305 it seams to run good the guages say it has oil pressure and shows its not overheating. well i changed the oil it was just old and dirty and i went to put new oil in it and the oil cap had this white cream sort of film on it not covered with it and there was a little condensation inside the neck that the cap conects to. which has scared me quite a bit ive read on the internet some say its just condensation others say its leaking or blown head gasket what do yall think its not blowing white smoke, it doesn seam to run like crap the oil isnt chocolate milk or yet anyways i was thinking about just replacing the hea gaskets to be on the safe side but what does everybody else think ? any sugestions? thanks

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    ewill3rd is offline Cadillac Technician
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    Re: anouther chevy 305 prblem

    Depending on your local weather conditions it could be normal. Clean it off and periodically check it.
    Make sure the oil level stays constant.
    If the oil wasn't milky when you drained it you are probably okay.

  4. #3
    N0DIH's Avatar
    N0DIH is online now Cadillac Owners Master
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    Re: anouther chevy 305 prblem

    I have seen that on cars before, never mine, always wondered how that much condensation gets in there, short driving trips? Leaky head gasket? intake leaks? porous intake?

  5. #4
    carnut is offline Cadillac Owners Master
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    Re: anouther chevy 305 prblem

    Normal condensation. If it were mine, I would replace the PCV valve to confirm the crankcase is venting completely. I would also verify the engine is getting to normal temperature quickly like it should. A cold, cool running engine will have condensation because it doesn't get to 195, 200 degrees to evaporate it. A new GM thermostat and GM PCV valve are much cheaper than headgaskets!! Also list your type of car in your signature profile so you dont have to type it every time you post.

  6. #5
    N0DIH's Avatar
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    Re: anouther chevy 305 prblem

    Probably why I have never seen it on my cars... I have just about always done longer trips and always kept up on PVC valves....

    And I change oil often (6000-7000 miles, typically what the OLM says...)




    (almost reminds you of the inner workings of some companies....)

  7. #6
    seth is offline Cadillac Owners Member
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    Re: anouther chevy 305 prblem

    well it turned out the pvc valve wasnt plugged in like it should have been so the filler neck is totally dry and the cooling pressurer problem i just didnt drive it long enough it has pressure now. anywho new problem no spark any ideas the coil ? thanks for the help

  8. #7
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    Re: anouther chevy 305 prblem

    I didn't change my oil for sometime on my LT1 (synthetic went around 10-12K miles) and did see some of the stuff up in the neck you described. Not sure of the source other than with the outside temps so cool the neck isn't getting warm enough to evap it all. Summertime it should get plenty warm. Time will tell!

  9. #8
    carnut is offline Cadillac Owners Master
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    Re: anouther chevy 305 prblem

    Should be a new thread!! No spark is usually the module within the distributor, coil is unlikely. But this is just a guess without you doing some diagnostics. Is there 12 volts to the distributor? Is the ground strap under the coil in the cap?

  10. #9
    seth is offline Cadillac Owners Member
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    Re: anouther chevy 305 prblem

    sorry i dont know any thing about electrical problems how can i test the module what should i connect the multimeter to on the distributor to measure the volts ? thanks

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