Jump to content

99 Sierra 1500 4x4 Will Not Complete Readiness

frankstl

Recommended Posts

frankstl New Member

frankstl

Posted
Posted

Hi, I have a 99 ext cab sierra half ton 4x4 with the z71 package with the 5.3L and it had 2 trouble codes in computer along with the service engine soon light, codes 171 and 174, lean condition on both banks, well considering id had the truck at that point for a little over 3 years now and put about 85k or so miles I decided id tune it up, new air filter and plugs, just did the fuel filter a couple months ago along with the fuel pump. Within 15-20 minutes of installing the new plugs and firing up the engine the light went off and it stayed off the rest of the day when driving the vehicle.

 

The next morning the light was still off and I cleared the previously stored codes and tried to reinspect the vehicle, at which point it was showing the evaporative, heated o2, and catalyst as not completed on the readiness test, was told I needed to drive the truck more and give the system time to complete the drive cycle, well now its been 5 days and roughly 600 miles of driving and 2 more attempts at passing the readiness and still the same condition as first try, and still no engine light which wont till the system completes the reset of all monitors I assume.

 

Have read of similar issues on other vehicles but not my exact type of truck and wanted to know if anyone knew of this issue and if so what corrected the problem as I would like to get my inspection sometime before the thirty days is up, preferable sooner as the hassle of being pulled over all the time and explaining this over and over will get old really fast.

 

Thanks for reading this and any help or info that can be offered.

frankstl New Member

frankstl

Posted
  • Author
Posted
Hi, I have a 99 ext cab sierra half ton 4x4 with the z71 package with the 5.3L and it had 2 trouble codes in computer along with the service engine soon light, codes 171 and 174, lean condition on both banks, well considering id had the truck at that point for a little over 3 years now and put about 85k or so miles I decided id tune it up, new air filter and plugs, just did the fuel filter a couple months ago along with the fuel pump. Within 15-20 minutes of installing the new plugs and firing up the engine the light went off and it stayed off the rest of the day when driving the vehicle.

 

The next morning the light was still off and I cleared the previously stored codes and tried to reinspect the vehicle after driving it for a few hours and about 100 miles, both highway and city driving, at which point it was showing the evaporative, heated o2, and catalyst as not completed on the readiness test, was told I needed to drive the truck more and give the system time to complete the drive cycle, well now its been 5 days and roughly 600 miles of driving and 2 more attempts at passing the readiness and still the same condition as first try, and still no engine light which wont till the system completes the reset of all monitors I assume.

 

Have read of similar issues on other vehicles but not my exact type of truck and wanted to know if anyone knew of this issue and if so what corrected the problem as I would like to get my inspection sometime before the thirty days is up, preferable sooner as the hassle of being pulled over all the time and explaining this over and over will get old really fast.

 

Thanks for reading this and any help or info that can be offered.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,840
    Total Members
    8,960
    Most Online
    appletrav
    Newest Member
    appletrav
    Joined

  • Who's Online   0 Members, 0 Anonymous, 432 Guests (See full list)

    • There are no registered users currently online

  • Latest Articles

  • Posts

    • newdude
      2 speed transfer case optional now?

      By newdude · Posted

      This is a 1/2 ton thing ONLY.  All HDs 2020-2026 have the two speed transfer case, with Autotrac as an option.     1/2 tons 2019-2026, regular 4x4s come with a single speed case (no 4LO!), and trucks with Z71 ordered, or all Trail Boss trucks come with the 2 speed case.  2 speed case is also an option on WT, and is also standard on High Country.  
    • newdude
      Different requirements for oil filters?

      By newdude · Posted

      2013 5.3 still to this day calls for the PF48 filter.  Which as a 15psi bypass pressure.     There is a TSB, 17-NA-157 that talks about the PF-63 and PF-64 filters which have a higher bypass rating of 22psi.    TSB HERE - temp.xml   "Beginning in 2012, the oil pumps began to regulate main gallery feedback instead of pump out pressure. This means that the oil pump now does not begin to regulate until pressure is built up to the main gallery. This change reduces the amount of time it takes to provide oil to the engine bearing and lifters during extreme cold start conditions.  Main gallery feedback oil pump control systems are present on the following engine families which use Spin-on oil filters: Small Gas Engine (SGE), Large Gas Engine (LGE), High Feature (HFV6) Gen2 and Small Block Gen5 gasoline engines. These engines with the main gallery feedback oil pump control systems are factory built with an ACDelco® oil filters"   It also calls out what engines use those filters.  The gen 4 small blocks were not on that list (LMG, LC9, L9H, L92, L94, L20, L96).  Gen 5 small blocks use the higher pressure filter.          That all said...   Your 7045 Napa filter is the PF63 equivalent, with 22psi bypass.  You are already using the higher bypass pressure filter.  You CAN keep using it, you don't technically have to use it though.  
    • Grumpy Bear
      Different requirements for oil filters?

      By Grumpy Bear · Posted

      Do you know WHY the filter relief setting was increased to 22 psig?    When the new system goes into the second stage the pump volume ramps up considerably. It was found that the 15 psi filter bypass setting put the filter in bypass on a warm engine when the second stage was activated. Raising the filter bypass setting forced the filter to do what it designed to do. Filter. Preventing debris from circulating during high load, high rpm operation.    So next question is how did GM find this out? VLOM/lifter failures and a deep dive by Melling Corp.    Last question. Is it required? Look at it like this; a motor may be equipped with a rev limiter. But it only works if the set point in reached. That 22 psig setting only matters if the pressure differential across the filter media exceeds 15 psig during normal warm operation. Second stage kicks in around 3000-3500 rpm.    I can't answer your question because I don't know you and how you use the truck. But I think there is enough information here to let you decide for yourself. 😉
    • Coastie05
      give me some tips to make my truck look better

      By Coastie05 · Posted

      Go back to OEM wheels. 
    • newdude
      2020 Trailboss 6.2 replacement

      By newdude · Posted

      Probably not their first rodeo, so it should go as planned most likely.  Typically the service manager or tech doing the swap will put some seat time to shake it down after they get it all put back together.  We usually put 50-100mi before we hand them back so if something happens, its not after you get it.  A coolant leaks, oil leaks, a ground left off or loose, vibration, etc.     The new engines so far have been good?  There's been a couple that have popped out there again (the replacement engine) but most have been okay.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...