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  1. 76chevyc20454

    Need help I'm lost!

    I have a 76 c20 454 th400 and when I cold start it it misses like no other. It spits and sputters around 400 but if I open choke it will smooth out and idle at 1000 until I hit the gas to kick off high idle. I'm stumped because if the choke is fully open it will run fine but if it's cold and the...
  2. 76chevyc20454

    Transmission slipping?

    We locked it into what we think is 4 hi and it droped to 2400 at 55
  3. 76chevyc20454

    Transmission slipping?

    My buddy has a 1990 gmc Jimmy or the k5 I would think. It had a 700r4 and he swapped a th400 into it. It's the 350 tbi but at 55 he is running 4300 rpm to 4600. It don't feel like it is slipping, and it shift through all three gears. It has 35 in tires and suppose to be a 3.73 reared . Is...
  4. 76chevyc20454

    Fuel line diagram

    I have a 1976 chevy c20 454 th400 and I've been looking for a fuel line diagram. It is a single tank and I can only find a dual tank one. Someone cut the return line and ran half of the original with ruber so trying to fix it all back to factory. Thanks for the help!
  5. 76chevyc20454

    400 turbo won't kickdown

    i have the same problem, every great once in awhile when im try to overtake a car it will kick down but most of the time it will stay in 3rd. :whymewhyme:
  6. 76chevyc20454

    gear ratio?

    i had the tire height off by on in. but its saying 2053 rpm at 55 for 3.08 and thats about what i do doing 55
  7. 76chevyc20454

    1989 s10 dies when comes to a stop

    Where did the wire go? I've heard of lockup torque converters doing that. Is it carb or Tbi?
  8. 76chevyc20454

    400 turbo won't kickdown

    :popcorn:
  9. 76chevyc20454

    gear ratio?

    Ok.. well with 3.08 its 1975 rpm. i could have the tire size wrong though so im going to check into that.
  10. 76chevyc20454

    gear ratio?

    Hey guys, I got told my truck has 3.73 but looking forward into it it does right about 2 grand at 55. ive only had it up to 70 once and it looked like it was at a lil over 2500. I tried a couple rpm calculators and it seams 3.08 add up to the rpm at that speed with my tire height if i got that...
  11. 76chevyc20454

    76 Gas Gauge problems

    im not sure if its to gas gauge just a wire up around there not hooked up, has no power to it. ill check the gas tank though and see if that will help. Thanks man!
  12. 76chevyc20454

    76 Gas Gauge problems

    And it had a new gas tank put in recently before i bought it.
  13. 76chevyc20454

    76 Gas Gauge problems

    Well i noticed there is a wire coming from it looks like around the gas gauge that's not hook up to anything. Didn't no if it could be that or not cant find a wiring diagram.
  14. 76chevyc20454

    76 Gas Gauge problems

    I have a 76 C20 454, th400 single tank. when i bought the truck the guy said the gas gauge worked. well while driving home about 20 miles it was on E the whole time so I thought he lied or im about to run out of gas. Anyway i stoped at a gas station and filled it up it held 20 gallons and i...
  15. 76chevyc20454

    Keep A/C or take out?

    Is there anything i need to do beside put a vacuum on the system and make sure it holds a vacuum? The system is completely empty right now. :popcorn:
  16. 76chevyc20454

    Keep A/C or take out?

    I have a 76 c20 454 and it has all the A/C components still there except the silinoid that raises the idle when the compressor kicks on. I hooked everything up to see if it worked, put a belt on it and pluged in compressor and nothing happen. so i pulled the connection to see if i was getting...
  17. 76chevyc20454

    idle speed

    Whats a good idle speed for a stock 454? I have the curb idle about 800 and 600 in gear. I read 600 but is that in gear or in park? :shrug:
  18. 76chevyc20454

    High Idle Issue

    So what should I set my timing at just making sure?
  19. 76chevyc20454

    High Idle Issue

    Ok i will get a timing light and see if this helps.
  20. 76chevyc20454

    High Idle Issue

    ok so it needs to be 4 BTDC and manifold vacuum has a constant vacuum right? sorry kinda new to this.
  21. 76chevyc20454

    High Idle Issue

    i sprayed starting fluid all around it and the idle didnt change.
  22. 76chevyc20454

    High Idle Issue

    I've noticed it opens about 1/4 of the way so the pull off it working but the guy that owned it before me put a spacer under the carb so I don't think the choke has the right linkage going to the spring in the intake manafold. I have trouble with it high idleing a lot
  23. 76chevyc20454

    High Idle Issue

    Im not sure what timing is don't have a timing gun, and vaccum advance is hooked up to ported vacuum. Im not sure what you mean by open element air cleaner, its the factory one with the snorkle looking thing coming out of the side of it.
  24. 76chevyc20454

    High Idle Issue

    I have ac delco r44t gaped at .35
  25. 76chevyc20454

    High Idle Issue

    So i have a problem lol, when i go out in the mornings and start my truck is misses pretty bad. Its a 76 c20 454/th400. It only misses when the motor is cold. once it warms up to about 190 it stops. The other day i figured i would try something so i pushed the fast idle cam down and zip tied in...

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