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Flames coming out of exhaust and idle issues

Discussion in 'Cherokee' started by Isandven, Oct 30, 2016.

  1. Oct 30, 2016 at 7:12 PM
    #1
    Isandven

    Isandven [OP] New Member

    Joined:
    Oct 30, 2016
    Member:
    #429
    Messages:
    1
    Gender:
    Male
    First Name:
    Ian
    Vehicle:
    89 Cherokee xj
    4.5 inch lift, back end chopped, 33inchers
    Hey so I have a 89 jeep Cherokee xj with some issues. For one, when in idle the rpms will raise and lower some what drastically, it sounds like it idles hard and posssbly the timing's off? And the biggest issue, when rpms reach past 3k fire comes out of my exhaust and won't stop even when brought down to 1k. If I let it sit then start it up no fire till it reaches 3k
     
  2. Oct 31, 2016 at 12:13 PM
    #2
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
    Oct 3, 2016
    Member:
    #317
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    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    Flames out exhaust timing issue or valves are getting stuck open, or something what they call floating when the valve springs are weak the valves will stay open at higher rpms. Timing issues could be vacuum (or lack of) to the distributor, vacuum or mechanical advance of the distributor not working, could be you just need to set the timing. Stretched timing chain that was able to jump teeth, etc. On the valve side you may need a top end done. All these are guesses.
     
  3. Oct 31, 2016 at 4:51 PM
    #3
    C2T

    C2T Well-Known Member

    Joined:
    Jul 31, 2016
    Member:
    #42
    Messages:
    759
    Gender:
    Male
    First Name:
    Richard
    Helena, Montana
    Vehicle:
    Jeep
    2.5" AEV Dual Sport lift, 35" Treadwright Guard Dogs, Black Rock Wheels, AEV Front & Rear Bumpers with Tire Carrier, Fuel Caddy 10 gal. Aux. fuel tank, Warn 9.5ti, 125' synthetic winch line, front axle skid, 20" LED light bar , Bilstein Shocks, steel steering skidplate,
    Vacuum leaks will cause all the above as well.....
     
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