Search results

  1. S

    CL-Fault: 5.7 Vortec

    No cats in junkyards around here, they chop em out. a good cat has higher temp at exit. So I have around 325-350° on the upstream of both cats. Bad cat was 275° exit and the good one was 415°. also looked at just sensor 2 data for both banks and could see the bank 1 was moving a bit too...
  2. S

    CL-Fault: 5.7 Vortec

    Well I think I got an answer..and can’t believe I’ve been chasing my tail like this. bank 1 cat seems bad. Infrared thermometer gave me the final clue. I guess the way this system operates both banks show as fault? Not sure what I’ll do you. I have inspections here and no CEL for now..cats...
  3. S

    CL-Fault: 5.7 Vortec

    I will triple check, but pretty sure when I ‘erase codes’ it says ‘no codes present’. I can see stored and pending, nothing in pending. Don’t think I’ve got a history option.
  4. S

    CL-Fault: 5.7 Vortec

    I don’t have codes since I cleared the one for upstream o2. Cleared code and put new o2..both banks. No codes since probably 100 miles of driving. edit: CL-fault isn’t a code, it’s the status of the PCM. It just tells you what ‘mode’ it’s in. When the coolant temp comes down back to open loop...
  5. S

    CL-Fault: 5.7 Vortec

    this is about here my knowledge drops off. I do know when you have a single bank fault it just replicates the known good bank o2 readings and fuel trims into the bad bank. But that’s not what I have, I have both in fault mode. Fuel trims on the two banks aren’t identical so seems like they...
  6. S

    CL-Fault: 5.7 Vortec

    Check out my first post in this thread. That’s as much of the issue as I understand. The part of this that’s really getting me is both bank being faulted at same time. This isn’t something I’ve seen before. it is reported by a scanner, I mentioned the model somewhere in here but just regular...
  7. S

    CL-Fault: 5.7 Vortec

    Closed loop fault is an OBDII term. The engine should be in closed loop, the fault part is the issue.
  8. S

    CL-Fault: 5.7 Vortec

    Understood. I get a mix of both numbers and graphs depending on parameter. its an autel al619. Will do more research on confirming if cats are OK. I was thinking since I had that post cat value of high 9X% it was OK. I think that basically is showing cat efficiency but not clear on it. Truck...
  9. S

    CL-Fault: 5.7 Vortec

    I am not sure I know how this is done. I see o2 sensor voltages both up and downstream, and then a real high ~98% value that I think shows cat efficiency? Simple enough answer thanks. looking at data in the scan tool nothing looks out of place for the stuff I understand. MAP, and MAF numbers...
  10. S

    CL-Fault: 5.7 Vortec

    Hey all, first post. Usually the ole google and forum search is all it takes but not this time. I have a 98 w/ 5.7 Vortec. When I look at the OBD scan tool I see on cold start, as engine warms up, it goes from OL to CL-Fault for both banks. Is this normal? Anyone with a scan tool want to plug...

Latest posts

Staff online

Members online

... and 14 more.
Total: 1,902 (members: 64, guests: 1,838)

Forum statistics

Threads
64,470
Messages
1,394,607
Members
51,743
Latest member
HectorZero91

Share this page

Top