Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

"Red Hot"

Discussion in 'The Garage' started by 82_k5, Oct 26, 2004.

  1. 82_k5

    82_k5 Registered Member

    Joined:
    Oct 3, 2003
    Posts:
    94
    Likes Received:
    0
    \"Red Hot\"

    I have a problem and I've never heard of it before. My Blazer with a 350 motor and dual exhaust is getting really hot. It is dark out here and I opened the hood because it smelled hot, to my suprise both exhaust manifolds were glowing orange. They are off of a 305 so the only thing i can think of is that they are too restricted??? /forums/images/graemlins/confused.gif /forums/images/graemlins/1zhelp.gif I really don't know what to do.
     
  2. blazerpunk

    blazerpunk 1/2 ton status

    Joined:
    Feb 3, 2004
    Posts:
    121
    Likes Received:
    0
    Location:
    Trinidad, CO
    Re: \"Red Hot\"

    Do you still have cataletic convertors? /forums/images/graemlins/dunno.gif
     
  3. 82_k5

    82_k5 Registered Member

    Joined:
    Oct 3, 2003
    Posts:
    94
    Likes Received:
    0
    Re: \"Red Hot\"

    nope, no cats, it has new mufflers so that shouldn't be a problem either. /forums/images/graemlins/1zhelp.gif
     
  4. 82_k5

    82_k5 Registered Member

    Joined:
    Oct 3, 2003
    Posts:
    94
    Likes Received:
    0
    Re: \"Red Hot\"

    anyone? I really need to know what's going on /forums/images/graemlins/frown.gif
     
  5. mxfireman

    mxfireman 1/2 ton status

    Joined:
    Dec 7, 2002
    Posts:
    2,480
    Likes Received:
    0
    Location:
    LHC, AZ
    Re: \"Red Hot\"

    Did this just start happening or did you do some motor work then it started happening?
     
  6. ColAdo82K5

    ColAdo82K5 1/2 ton status

    Joined:
    Feb 18, 2000
    Posts:
    789
    Likes Received:
    0
    Location:
    MO
    Re: \"Red Hot\"

    Running lean makes things hot...
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,975
    Likes Received:
    189
    Location:
    Roy WA
    Re: \"Red Hot\"

    Pull off any of your emissions stuff?

    As was mentioned, running lean will cause this, and pulling off emissions equipment (particularly EGR) will cause the engine to run lean.
     
  8. fatboy

    fatboy 1/2 ton status

    Joined:
    Jul 1, 2003
    Posts:
    290
    Likes Received:
    0
    Location:
    Tennesse
    Re: \"Red Hot\"

    did you mess with the carb? or what was the last thing you did to the engine besides the manifolds? it needs more gas /forums/images/graemlins/burb.gif
     
  9. mxfireman

    mxfireman 1/2 ton status

    Joined:
    Dec 7, 2002
    Posts:
    2,480
    Likes Received:
    0
    Location:
    LHC, AZ
    Re: \"Red Hot\"

    You know that Halloween is right around the corner I think they K5 would look sweet glowing RED under the hood. Not too ghoulish but you could work with it! /forums/images/graemlins/whistling.gif
     
  10. fr8train

    fr8train 1/2 ton status

    Joined:
    Aug 2, 2000
    Posts:
    1,712
    Likes Received:
    0
    Location:
    Maryland
    Re: \"Red Hot\"

    Double check the mufflers and see if they are on backwards. Were you doing any "hotrodding" since you upgraded your exhaust?
     
  11. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

    Joined:
    Aug 28, 2002
    Posts:
    9,095
    Likes Received:
    144
    Location:
    california
    Re: \"Red Hot\"

    Whats your engine temp? Sounds like a lean mixture. IIRC a rich mixture can have the same effect if the unburnt fuel is burning in the exhaust. Have any choke problems?
     
  12. RustBuket

    RustBuket 1/2 ton status

    Joined:
    Feb 21, 2003
    Posts:
    1,618
    Likes Received:
    0
    Location:
    Saskatchewan, Canada
    Re: \"Red Hot\"

    Did you recently get new mufflers? What kind are they? A regular muffler on backwards will create excess pressure in the system and therefore heat. If its just a bottle type muffler or something with a simple design like that then thats probably not it.
     
  13. MOABDADC22

    MOABDADC22 1/2 ton status

    Joined:
    Jul 24, 2001
    Posts:
    1,348
    Likes Received:
    0
    Location:
    Cheyenne, Wy
    Re: \"Red Hot\"

    Last time I saw glowing red manifolds was when I smoked my Vortec....................................... /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif
     
  14. Blazer1970

    Blazer1970 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,600
    Likes Received:
    0
    Location:
    Old Mission, MI
    Re: \"Red Hot\"

    Lean or late. You are either running really lean due to a big vacuum leak (or a REALLY mis-jetted carb), or your timing is retarded.
     
  15. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,539
    Likes Received:
    923
    Location:
    Massachussetts
    Re: \"Red Hot\"

    The exhaust manifolds in my 400 small block would turn a dull red after driving a few miles on the highway--I checked all the settings like timing,carb mixture,brakes dragging,etc--everything checked out ok--about a month later I had to replace the manfold because the crack it had from day one I brazed shut had spread--the "new"manifold felt about 5 lbs heavier--the other one was so corroded it was only about an eighth of an inch thick--too thin to keep it from turning red I guess--never did it again since!. /forums/images/graemlins/crazy.gif
     
  16. 85HeartBurb

    85HeartBurb 1/2 ton status

    Joined:
    Jan 10, 2002
    Posts:
    735
    Likes Received:
    0
    Location:
    Temecula, south
    Re: \"Red Hot\"

    I just went through this on my 88 tbi bbc the timeing was off and the cat was clogged!!!
     
  17. 82_k5

    82_k5 Registered Member

    Joined:
    Oct 3, 2003
    Posts:
    94
    Likes Received:
    0
    Re: \"Red Hot\"

    The base gasket had a good sized leak, I fixed that and still no cigar. I think it may be the carb. I got a replacement at the junk yard but I'm not sure what it came off of because they guy took it off before I got there. I have only noticed glowing since then but it could have been happening before because I don't usuaully pop the hood in the dark right after driving it. The whole motor seems to be hot so could that also be related to mixture (to lean or rich)? I have no idea what temp it is because my temp. guage says it's only like 180 or less so that is clearly wrong. Thanks for all the advice.
     
  18. mxfireman

    mxfireman 1/2 ton status

    Joined:
    Dec 7, 2002
    Posts:
    2,480
    Likes Received:
    0
    Location:
    LHC, AZ
    Re: \"Red Hot\"

    Sounds like the jetting on the carb you just put on.
     
  19. fatboy

    fatboy 1/2 ton status

    Joined:
    Jul 1, 2003
    Posts:
    290
    Likes Received:
    0
    Location:
    Tennesse
    Re: \"Red Hot\"

    temp in the combustion will not really affect water temp. If I recall right combustion temp is around 1100 deg I could be way wrong but I recall that.

    [ QUOTE ]
    The base gasket had a good sized leak, I fixed that and still no cigar. I think it may be the carb. I got a replacement at the junk yard but I'm not sure what it came off of because they guy took it off before I got there

    [/ QUOTE ]
    If you got a used qjet go buy a rebuild kit for it. Its not really that hard. Remove jets in you original carb and use those is what I would do. Good luck /forums/images/graemlins/burb.gif
     
  20. m j

    m j 1/2 ton status

    Joined:
    Dec 28, 2001
    Posts:
    4,606
    Likes Received:
    0
    Re: \"Red Hot\"

    pull the plugs and see what they tell ya
     

Share This Page