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newbie help

Discussion in 'The Garage' started by jroymcd, Jul 19, 2005.

  1. jroymcd

    jroymcd Registered Member

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    just got me a 75 blazer.im kinda green when it comes to engines. had a re-built th350 installed, had a compresion check done and the motor is very strong (150 and even on all) it has Hei.

    anyway, it ran good when i got it except a weak tranny which i already replaced. its starting to run bad. power loss and hesitation. its taking longer to start as time goes by. is it a timing issue?
     
  2. down4thakrown

    down4thakrown 1/2 ton status Premium Member GMOTM Winner

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    did you try doin a tuneup? oil,air filter, plugs and wires,.......
     
  3. jroymcd

    jroymcd Registered Member

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    air filter is clean. wires are not to old. plugs look good. so i have Hei and it says delco on top. how do i know what rotor i need?
     
  4. Mad-Dog

    Mad-Dog 1/2 ton status

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    sounds more like a ignition issue (no fire in the hole)
    It's 1:49am here in indianapolis and i'm really tired after fixing my brokedown kenworth, but i will find time tomorrow to explain how to check the individual components......goodnight :crazy:
     
  5. jroymcd

    jroymcd Registered Member

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    sounds good i need any help i can get

    thanks
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I would guess you have a carb issue personally, but ignition parts aren't hard to change/diagnose either.

    Rene
     
  7. R72K5

    R72K5 Banned

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    yeh its either module or coil related or the carb is crappy dirty gummy

    and 150 psi cylinder pressure is normal minimum, its not real strong, its average normal nothing special at all by any means

    alot of the 80s and up 305s are way more than 150 psi even(the 190hp ones and etc L69 RPO etc)

    truck engines hi torque were usually always lower CR than car turbo fire engines, trucks got screwed but did get lots more low end low rpm torque than the cars got

    normally


    is your dizzy not clamped tight at the base on the intake manifold ?

    see if you can turn it by hand real easy, but if it takes some effort to turn it then its ok

    hard to start ? whats it do when you crank it, does it crank over unevenly like hesitantly ? when hot ? or all the time no matter temp ?

    may be too far advanced, but it depends on what its doing wrong when youre cranking it
     
  8. jroymcd

    jroymcd Registered Member

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    it used to start right up, less than a second after turning the key. now it turns for a bit (5 seconds) than fires up. it cranks evenly and the same hot or cold. could it be a week fuel pump? it idles decent but when i give it gas it just does not have the power it had before a wants to chug a little.

    i picked up new wires, a rotor, and fuel pump today to see if any of them help. i will install them tonite and try to check the timing. what should the timing be?
     
  9. jroymcd

    jroymcd Registered Member

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    just put in the new fuel pump in. it helped but, something is still not right. going to do wires, plugs, rotor and timing tommorow.
     

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