Recent content by 05YukonXL

  1. 05YukonXL

    Another rough idle and new codes...

    Well then.. new O2s in, a few other tests and and a steady decline rather than improvements in the idle. Handed it over to my new mechanic. Compression on Cylinder 5 @40% lower than 3 and 7 at idle, better readings at high RPMS. Things pointing to bad lifter. More info in a couple days.
  2. 05YukonXL

    Another rough idle and new codes...

    Today's update: 1) Temps back up in the high 70's and the rough idle is much 'less rough'. 2) Looked at the four O2 sensors (didn't remove). The two UPSTREAM sensors have, at some point, been replaced and certainly look less weathered than the two downstream sensors that appear not to have...
  3. 05YukonXL

    Another rough idle and new codes...

    Thanks for the feedback. Interesting ... Got this truck second hand and to my knowledge no oxygen sensors have been changed during my ownership. Indeed the 174 and 171 codes are LEAN both banks. I have not tried tightening bolts ... but I can. (Only sensor I can think of that was changed...
  4. 05YukonXL

    Another rough idle and new codes...

    I can switch the scanner to 'metric' readings on the next run... assuming that goes to grams/sec reading. .01 lbs/sec = 4.53592 g/sec .02 lbs/sec = 9.07185 g/sec
  5. 05YukonXL

    Another rough idle and new codes...

    Couple notes and responses: No major work prior 18 months other what is mentioned. The vehicle had new radiator and AC condenser installed 18 months ago and it sat for a few months waiting for said parts. P0305 does not show up under PENDING while other three codes ARE PENDING. FRP(psi)...
  6. 05YukonXL

    Another rough idle and new codes...

    Your right, yellow cap!
  7. 05YukonXL

    Another rough idle and new codes...

    Is Flex Fuel. Previously (last dealer visit) when the idle was commanding at 1800 rpms the ECM was reading 77% Ethanol in the fuel .. fuel in the tank was shown to only be 3% ethanol via testing fuel sample, dealer reset/relearn on that.
  8. 05YukonXL

    Another rough idle and new codes...

    Thanks everyone... I'll have to record some data (no graphs) with my basic scanner - just did starting fluid around the top of motor (and 'usual suspect' areas) made no difference... will report back.
  9. 05YukonXL

    Another rough idle and new codes...

    All this leads to P0171, P0174, P0300, P0305... Background: Have had intermittent P0305 (not AFM cylinder) for 18 months on 2014 LT with 115000 miles but there were no clear cause or noticeable symptoms other than minor bad idle at low rpms (while stopped). Coil good, spark plug good, took...
  10. 05YukonXL

    Ticking noise. Lifters?

    Any resolutions? I just got my 2014 Suburban back from body shop and got a 'Check Engine' light. Mechanic read error as misfire, at low RPMs on Cylinder 4. Ruled out plugs and coils. Did oil/filter change. But no time to diagnose further, I towed a trailer 200 miles (75MPH average) and a...
  11. 05YukonXL

    Wheel + Tire combo 17-18" better than 20" for smoother ride?

    The 20"s came with 275/55/20
  12. 05YukonXL

    Wheel + Tire combo 17-18" better than 20" for smoother ride?

    Thanks again everyone for the feedback. I ended up getting the '14 Suburban. Mainly I couldn't find anything comparable for the money. Having driven it with the 20" wheels for a few days here are some observations. It came with 17" wheels (thank you door decal). This is LT model with LTZ...
  13. 05YukonXL

    TIGHTEN FUEL CAP Message - Check Engine Light on

    Digging up this old thread to inquire ... did the Fuel Tank Pressure Sensor do the trick? I've done the fuel cap, evap canister and evap solenoid (blew out all the charcoal too), still getting check engine. Thanks.
  14. 05YukonXL

    Wheel + Tire combo 17-18" better than 20" for smoother ride?

    Thanks for the feedback. Makes me a little more confident that I buy this 2014 LT I can replace the wheels with 18" rims and better tires for an improved ride - not sure it will match the 2005 ride of course. (I have a line on new factory 18"x8" wrapped in Michelins at a local tire shop. The...
  15. 05YukonXL

    Wheel + Tire combo 17-18" better than 20" for smoother ride?

    Let me explain... I'm looking at a 2014 Suburban LT (w/90k miles - 2WD) that comes equipped with 20"x8.5" LTZ wheels with fairly new 275/55/20 Goodyear LS-2 tires, however the test drive on that combo felt way to 'stiff' - every little bump and imperfection in the road (and there are a lot of...
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