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  1. Chevy Suburban Forum (GMC Yukon XL)
    Hello, I'm new to forum, looking for some help. This is a COLD engine OPEN loop problem only, all good when warm. I have a 91 Suburban V2500 5.7L 4L80E Basically when the engine is cold I have to work the throttle and pray I make it thru an intersection, or wait for it to warm up before I...
    #coldstart open loop tbi
  2. Chevy Silverado Forum (GMC Sierra)
    Working on 2001 GMC Sierra 2500hd with 6.0 gas engine and 351k miles. It’s throwing a p0200 and p0300 codes and showing open loop on banks 1 and 2. I’ve replaced the injectors, injector plugs, catalytic converters, o2 sensors, tested the injectors with node light, and tested MAS. Truck has no...
    code p0200 code p0300 open loop
  3. Chevy Suburban Forum (GMC Yukon XL)
    Please Please Help.. 1999 Suburban K1500 LT 5.7 Vortec with the newer Spider style. Completely Stock other than added a second battery with a relay. Background: Fresh Rebuild after previous head gasket and 2 cracked heads. Issue: P0134 P0154 and seem to be in Open Loop all the time...
    open loop p0134 p0154
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