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quick start vs. slow start

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by thatK30guy, Sep 4, 2001.

  1. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Can anybody tell me why my Blazer with the 305 and quadra-jet starts up with one kick on the pedal and the split second the ignition key is turned?

    My K30 with the 454 requires you to pump the pedal about 2 or 3 times and a continuous cranking for about 5 seconds before it fires up. It also has a quadra-jet, too.

    I wish this K30 would fire up immediately like the Blazer.

    Any ideas? [​IMG]

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

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  2. pcorssmit

    pcorssmit 1/2 ton status

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    I'm no carb expert, but I believe the Q-jets have a gasket that dries up and leaks some of the fuel that should be in the carb down the manifold when its not running, which can cause that kind of problem.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I believe that could be possible because I hardly ever drive the K30. Maybe once a week if that.

    This quadra-junk on the 454 is a brand new Edelbrock installed like last year. It seemed to work fine when it was first installed.

    I also notice I have a choke problem on it too. Its electric and seems to fast idle ALL the time! Just cant get the idles back down.

    I'm no carb expert either!! [​IMG][​IMG] I just know what carbs I want to use! And Holleys are not it!! [​IMG]

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  4. Esteban86K5

    Esteban86K5 1/2 ton status

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    Every morning I get in, pump 5 times, turn key and it purrs like a kitten. EVERY SINGLE DAY! <font color=red>I LOVE IT!!!!!</font color=red>


    Quad on a 350.

    <font color=blue>Esteban</font color=blue>

    <font color=red></font color=red>
    <a target="_blank" href=http://coloradok5.com/gallery/Estebans-album>Take A Gander At My Truck Here.</a>
     
  5. Twiz

    Twiz 1/2 ton status

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    I'm no carb expert, but thats never stoped me.
    It's probably the "wells" (float boals) leaking and doing the pumping for you.

    Not a big deal, just epoxy the wells when you rebuild it.
    (also check the throttle shaft for wear, when you rebuild it. Knock out two birds with one stone)

    <font color=purple>In accordance to the prophecy.</font color=purple>

    <font color=blue>Twiztid</font color=blue>
     
  6. RESTORE89

    RESTORE89 1/2 ton status

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    my tbi starts imediately everytime also
    i do like the injection when it works right it really works right

    It needs a bigger motor.
    what's in it now?
    doen't matter it NEEDS A BIGGER MOTOR
    89 350tbi/700r4h/np208/4.11's
     
  7. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Wes,
    Does it fast idle after you blip the throttle?
    If it kicks the idle down after a quick blip, that might just be the nature of the beast. If it doesn't kick down at all (EVER), then you probably have a problem.
    Some carbs (not sure about the Edlebrock Q-jet replacements because I never had one) such as my 4011 Holley (which is soon to be replaced with my rebuilt factory Q-jet), has no provision for fast idle kickdown other than a blip of the throttle. On the fast idle cam there are steps and a weight. Depending on how cold it is to start will dictate which step the fast idle will start on. As the choke (electric) warms up, the spring expands (so that you shoud have no more choke), but the step holds the fast idle open, until you blip the throttle which pulls the fast idle adjustment screw away from the stepped fast idle cam and the counter weight on the end of the cam causes it to rotate. When the throttle is returned to idle position (after blip), the fast idle screw does not contact the fast idle cam steps, so your idle is returned to normal. I'm not sure if this is how the Edlebrock works, but it is how the Holley electric choke works on the 4010 and 4011 (not sure of the others). I have contacted Holley to see if I can change this (because if I remember correctly my old Q-jet would kick down automatically), and they said no.

    Hope this helps.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot>http://coloradok5.com/gallery/Leadfoot</a>
     
  8. ftn96

    ftn96 1/2 ton status

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    Convert to TBI. No gas pumping required. Starts better than my wife 2000 Sebring.[​IMG] Gotta love that!

    tRustyk5 for President!!![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  9. OneLeft

    OneLeft 1/2 ton status

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    My Blazer, when I have battery power. starts right away. Edelbrock MPFI. My fathers 1998 stock F/I Vortec 454 takes a bit to start. I believe its just the difference in the amount of fuel needed for cold startup.

    <font color=red>One</font color=red><font color=blue>Left</font color=blue>
    Have <font color=red>K5</font color=red>, will travel.

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  10. jwduke

    jwduke 1/2 ton status

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    Check fuel pump, may be bleeding back, not keeping fuel up to the carb!

    1 ton '87 Chevy SWB in the making!
     
  11. pcorssmit

    pcorssmit 1/2 ton status

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    That wouldn't effect how soon it fires up. There is always fuel in the carb.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  12. Ddragggon

    Ddragggon 1/2 ton status

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    what kind of ignition setup do you have on the K30? and what have you on the blazer? my 77 C20 picup would start with 1 gas tap, and a tap of the ignition key. it was running an HEI unit. same with my 454... tap the gas once, turnthe key ( have to actually hold the key for a moment on the 454 for the first start of the day) and fires right up. on the 73 K20 suburban tho, it takes a lot of cranking to get it to start, regardless of wether I've had it running before or not. there are actually 2 differences with the 73, the first being a points style ignition, the second being a carter POS carbureator. not entirely sure which would be the greater cause, all 3 vehicles had the choke disabled, ( 454 has its floating free, due to the diesel factor, other 2 had thiers zip tied open) of course, a lot of this could be due to living in Arizona, land where the engine never cools down enough to work on, or need to be warmed up, ( except in december, and the early part of january)

    -Rich

    ph34r m3!

    1337 TruXoR
     
  13. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Let me start off with first: Sorry guys, no TBI or any type of fuel injection is going on by K30! Too much $$$ and I dont want to 'butcher' the stock wires.


    Leadfoot, yes, the truck still fast idles after blipping the throttle. It still fast idles after driving it around town for a while and when I put it in park at home, its still idling fast.

    Some days the fast idle will come out and most days it wont.

    When I first got the carb, it worked fine and flawlessly. The longer I had it, the more it started to 'act' up. I still like the carb alot, but would just rather it worked a little better.

    That was the main reason I got this carb. The electric choke and it was the direct replacement for my year and engine size.

    This carb is the Edelbrock #1904.

    I need to take the truck back to my friend who is familiar with Q-Jets. Problem is, he is always 'busy'. [​IMG] (you know those types of guys - they are never busy to begin with!) [​IMG]

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

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  14. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Ddraggon, the ignition set up on both trucks are totally stock.

    The K30 is the only one running aftermarket stuff and those are the Accel 8.8 wires. Those suck! [​IMG]

    Both trucks are running the HEI units, too.

    <font color=blue>"Ya don't have to beat it, ya know!!!</font color=blue>

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>http://coloradok5.com/gallery/thatK30guy</a>
     
  15. rocko

    rocko 1/2 ton status

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    Heck.. I'm now driving my 89 around as a daily driver.. I still pump it like it's a carb since i'm so used to my 83 w/ the q-jet..
    The 83 required 3 blip's of the gas pedal then she fire's right up.. It's quirky.. but I love her.. [​IMG]

    I haven't failed, I've found 10,000 ways that don't work. www.rocko.rockcrawler.com
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    How about timing? Is the "cranking speed" any different between the two? Not the only cause, but can be a problem some time.

    Pedal pump shoul dbe one time. Set the choke, prime system with the accelerator pump. You can always check to see if its got fuel by popping the air cleaner off (before attempting start) and hitting the accelerator. You should see gas squirting into the primary venturis if the float bowl has fuel in it. If not, thats your problem, you are having to get fuel back up to the carb. Sitting for days doesn't help this, but I am surprised E-brock didn't fix the well plug issue.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  17. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    What's the condition of the batteries? It won't help the fast idle problem, but a poor battery can cause a vehicle to need more cranking time (spins motor slower and less available juice for ignition). Just a thought.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot>http://coloradok5.com/gallery/Leadfoot</a>
     
  18. BillyBob

    BillyBob 1/2 ton status

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    Wes- I had a problem like yours with my 84's q-jet. the thing didn't want to start because it liked to flood a lot. Mainly due to the fact that my choke themostat was toasted. The thing would be idling really high no matter what I did because the choke was always stuck closed. After a rebuild and new themostat, works like brand new.

    <a target="_blank" href=http://billybob87k5.50megs.com>Homepage of Porky & Stinky</a>
    ".. Sanatarium.. leave me be..."
     
  19. CaptCrunch

    CaptCrunch 1/2 ton status

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    Wes, Some will depend on the 454 setup. Different motor start up differently. Knowing you know your way around vehicles and can do a lot, why don't you call up the Edelbrock Help line and see what they have to say. They should be able to guide you in the right diorection. Also you can get troublkeshooting info off their website and in the manual that came with the carb, but sounds like you got a kinda different problem since it just started. I personally would stay rebuilt quads because the Edelbrocks are spendy... otherwise I still like the old performer series Edelbrock carbs(Carter AFB type)... so easy to work with!

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  20. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Mike, I was thinking of calling Edelbrock tech line, too. Will have to do it now.

    I did have the old stock Q-jet rebuilt, twice. It just did not perform right. We found out the problem. The jets and metering rods were not the right sizes to work with each other.

    I bought this truck from Ft. Collins, CO, and it was adjusted to the higher altitudes when I first got it. It ran fine when we left CO.

    When we got home, thats where the problems started. It never ran 'smoothly'. Always hard on starts, etc. I had the original carb rebuilt twice in the 5 years I have owned the truck and it never made me happy.

    On the last inspection and tear down of the carb, my buddy figured out the mismatching rods and jets. So, instead of finding the correct pieces for our lower alititude, I went ahead and bought the Edelbrock 1904 carb. I was hoping to get a 'trouble-free' carb, since it would be brand new. With a little tuning and adjustments, it ran flawlessly and I was very happy with the start ups and performance.

    Until about the last 6 months or so. It went down hill. But, I dont drive the truck enough to exactly pinpoint the 'problem'.

    I will have my buddy come over and read everyone's replies and let him look the carb over again.

    BTW, when the truck sits for longer days, its harder to start and cranks more. After the truck has run and is warm, it starts on a dime. When the truck sits overnight and I start it in the morning, one pump on the pedal and it starts right up, again, on a dime, immediately. Just whenever the truck sits for longer periods of time, it takes longer to crank and more pumps of the pedal. I know that is normal, but it shouldnt take THAT long to crank over.

    [r]I'm a "black top mudder"!!![/r]

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