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.

Backfiring..gimme some ideas.

Discussion in 'The Garage' started by AkMudr, Dec 12, 2005.

  1. AkMudr

    AkMudr 1/2 ton status

    Joined:
    Dec 30, 2004
    Posts:
    917
    Likes Received:
    0
    Location:
    Alaska
    85 3/4ton M code block.

    So in an effort to help pass an IM tomorrow I did a few things to the truck. Plugs (delco r44t) air cleaner, PCV valve, oil change. the usual ****. Idling @950, timing @4*

    Hooked my smog pump back up..had to change the diverter valve. When the diverter valve took a crap earlier this year it backfired bad so I just pulled the vacuum line from it and it stopped backfiring.

    Well, now its backfiring again. AIR pump is still hooked up and it does it with/without the diverter valve vacuum line hooked up.

    I noticed with the air pump hooked back up I get much more of a rumble tone in the exhaust.

    Possibly the choke sticking? I gave been having some issues with the choke.

    Possible carbon buildup? Old plugs didnt look bad, actually looked slightly lean..wondering if Ive got a lean backfire however, I set the mixture with a vacuum gauge.
     
  2. AkMudr

    AkMudr 1/2 ton status

    Joined:
    Dec 30, 2004
    Posts:
    917
    Likes Received:
    0
    Location:
    Alaska
    Backfire solved. Now to fix a sticking choke.
     

Share This Page