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Timing\Fuel Problem?

Discussion in 'The Garage' started by 2High4U, Aug 24, 2005.

  1. 2High4U

    2High4U 1/2 ton status

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    I just bought a 73 Blazer 1 month ago and I couldnt drive it because the tranny was shot... so i put a rebuilt TH350 in it and went to drive it it seems to run good no unusual sound but I have no power on hills and after driving it for a while it back fires through the carb I adjusted the timing to 12* and set the new edelbrock carb to its factory settings 2 turns the idle adjustment is all the way down and it seems to idle too high and when i put it in gear it goes in a little hard or rough but not painfully hard oh and there is a electric fuel pump connected to the mechanical one for some reason too. any ideas im thinking it may be the timing chain or something. i have to have it running good because I have to drive it to pennsylvania 3000 miles away from here
     
  2. blazinzuk

    blazinzuk Buzzbox voodoo Premium Member GMOTM Winner

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    Hmmm adjust the points or why even do that replace with an HEI
     
  3. 2High4U

    2High4U 1/2 ton status

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    I forgot to mention that it has an hei distributor :thinking: i replaced the cap rotor and wires where should the timing be?
     
  4. uglytruck

    uglytruck Registered Member

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    How many miles does your engine have, as it may very well have a stretched out timing chain, although I'm not sure that would throw your timing that far off. I had an old cutlass that ran OK until it quit on me, turn s out the timing chain jumped. New timing chain produced a much better running engine than before. So if it has high miles it can only help to change, good luck.
     
  5. kawijames

    kawijames Registered Member

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    re :missing power

    I'm new to the board but have been doing gm performance for some time now maybe i can help. 1st what kind of edelbrock are you running? do you know the specifics of the motor(ie comp ratio,cam size etc)? on my last burban i dropped down to a 600 cfm to get more response but only to lose ALOT of power, the main jets were just too small. also when you turn the key does is spint the motor a few times and then start or does it just fire right up on the first time? other possibilities are : substandard plugs and wires, old coil loosing output ability, timing could be off, needle seats sticking in the carb( common w/ edelbrocks that are up in age). when was the last time the truck got a Proper tune up? ya know sometimes the small things we overlook are the ones that cause the most grief!
     
  6. diesel4me

    diesel4me 1 ton status Premium Member

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    HEI hooked up right??

    If whoever put the HEI in didn't run a new 10 ga wire from the fuse box to power it,and used the original "hot" wire to the old coil to power it,that might be the whole problem..you need a full 12 volts ,and the old coil wire is a resistance wire that reduces amperage to avoid burning the points out quickly--wont deliver enough voltage for an HEI distributor..I've bought a few trucks cheap because of that,and lost count as to how many I had to re-wire at my friends shop that had HEI transplanted into older trucks..

    I'd probably want a new timing chain if I had a 3000 mile ride ahead of me!--nearly every chevy V8 I've owned needed one,most had that crap nylon toothed camshaft gear that always loses its teeth, and most of the time they end up in the oil pump! :eek1: ..the timing chain and fuel pumps are the main failures in most chevy's towed into a shop during a long trip(like a vacation!)..

    May times Edelbrock carbs cant be "idled down" because of a vacuum leak--that can cause hesitation and backfiring too...spray carb cleaner at any gaskets or hoses you suspect might be letting air sneak in--it will change the rpms while its idling if you spray it on a leaking area.. :crazy:
     
  7. 2High4U

    2High4U 1/2 ton status

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    The engine probably has alot of miles but im not exactly sure how many, the engine seems to be stock except for the carb and intake I did a tune up on it plugs wires cap rotor gaskets hoses-etc and its not hard to start takes about3-5 seconds ill check for vacume leaks check wiring and replace timing chain thanks for all of your help ill get back to you guys and let you know what happens.
     
  8. blazinzuk

    blazinzuk Buzzbox voodoo Premium Member GMOTM Winner

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    Yah if the HEI wasn't put in right that could contribute to the problem. I kind of am leaning towards the distrubitor did you check the module and stuff. No power under load also may be the fuel pump or something in your carb. I have never seen a timing chain skip a tooth or anything like that (not saying it can't happen) but I did install one wrong once and it didn't run right at all
     
  9. 2High4U

    2High4U 1/2 ton status

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    I checked the wire from the distributor it is what i believe to be the same size as the ignition wires inside but goes to a smaller wire on the firewall then into the place behind the fuse block would that be causing the problem or contribute to the problems? the electric fuel pump works fine and one thing that stumps me is that when im on level surfaces its ok only when im on bigger hills it looses power some one told me that it could be dirty gas or have water in it this is really frustrating especially having to be out of my place at the end of the month if i can make it through death valley\mountain passes ill be ok
     
  10. kawijames

    kawijames Registered Member

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    have you checked your needle seats yet? with the edelbrocks there are no gaskets below the fuel line so it takes out a gaskety on the carb problem.i had a problem like yours with 2 edelbrocks back to back( maybe a manufacturing problem on that batch?) also with the back firing that definitely sounds like a timing problem to me. have you tried advancing and retarding the timing while the engine is running? its incredibly easy to get the dist a tooth off when you are reinstalling it. hope some of this helps.
     
  11. TongQiang

    TongQiang Newbie

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  12. 2High4U

    2High4U 1/2 ton status

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    im not really sure where the timing should be i have it set at twelve degrees right now what should i advance it to 14? as for the carb it could be i have to fool with it and see what i can get out of it im going to turn them both 1
    \2 turn more i cant afford a new carb right now. with my job i dont have much time to work on it right now only on the weekends because im not allowed to work on it at my apartment complex :mad: i have to go to my inlaws house i really cant wait to get back to pa where i have spare rears tools and parts lying around i could use when i get settled in pa im gonna pay for a membership here because i like this site soooo much and by the way whats up with the dood from china :confused:
     

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