gmrulz4u Posted May 31, 2004 Report Share Posted May 31, 2004 OK, so I've already posted about my recently O2 Sensor codes that I've been getting, but now there's more to the story. First, I was getting a code 45, indicating a RICH exhaust. No big deal. I have an AutoMeter Air/Fuel Gauge installed and can literally sit there and watch the LED "stuck" in the RICH and not moving, so it was no surprise to me. Then I decided to double check my OBD codes again and I saw I was also getting a code 44. No big deal again. I just figured that my O2 was getting slow and "lazy". I replaced it a year and a half ago and it's probably time for a New one. Now for the past few days, I've gotten code 45 about 10 times or so. It would be "no big deal" again, BUT, I realized that it always happens when I'm idling at a STOP or in PARK!!?? So what? Well I remembered reading that the one of the criteria for a code 45 to be set is throttle is between 3 and 45 percent open!!!! Why in the heck is my ECM setting a code 45 and turning on the SES light if my throttle is completely CLOSED!? I'm at 0% NOT 3-45%!? I guess it COULD somehow be my TPS but I used to always use a Snap-On Scanner(borrowed) and my TPS was always working perfectly and would show "0%" at idle. So if it's NOT my TPS, what else could it be?? Could the ECM itself be screwed? I mean I KNOW that my O2 is stuck RICH when I'm idling, but still, the ECM shouldn't be setting a code 45 unless I'm at least 3% on the throttle... Anyone? THANKS! Quote Link to comment Share on other sites More sharing options...
Brian P Posted June 1, 2004 Report Share Posted June 1, 2004 not for nothing, but I was tracing a code 43 for 2 days after I installed the 3.2L and I finally replaced the ECM and problem solved. always good to have spare ECM's around! Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted June 1, 2004 Report Share Posted June 1, 2004 I have an AutoMeter Air/Fuel Gauge installed and can literally sit there and watch the LED "stuck" in the RICH and not moving, so it was no surprise to me. if the LEDs on the A/F gauge are not moving, wouldn't that indicate that the engine is not operating in closed loop? i would guess maybe your 02 sensor is bad....possibly not operating when it heats up? just a guess. Quote Link to comment Share on other sites More sharing options...
gmrulz4u Posted June 1, 2004 Author Report Share Posted June 1, 2004 Yeah I'm actually thinking the ECM for another reason as well. Lately I've been thinking that my IAC was screwed because my idle would sometimes go crazy. Then the other day the car wouldn't start unless I gave a little throttle...but it would die as SOON as I let off the gas...this meant that the engine wasn't getting enough(or any) air...a couple more tries at starting and suddenly it just starts up and runs perfect... Then, just about an hour ago it did the EXACT same thing! I've already been driving the car for a few hours today and it was fine. I went out an hour ago to start it, and it didn't start, unless of course I stepped on the gas. Then I got it to start on about the 5th try but the idle was going all crazy...I was able to back out and start driving anyway so I did...as I was driving I noticed if I let off the gas the RPMs would go insane...dropping to ZERO and then up to like 2000 and everywhere in-between...so I pulled into a parking lot and it finally stalled...so I stopped, put it in Park, and re-started it...and guess what? Now it's running perfectly again...!!! So because of all this I know FOR SURE that the problem is the IAC CIRCUIT, but whether it's the ECM messing-up, or the IAC itself is still yet to be determined. I think that the ECM may be losing it's information on where the IAC is in terms of Motor Steps...or it's not sending the proper commands... I know that the last thing an ECM does when the engine is shut OFF is command the IAC to be fully OPEN, that way when the engine gets cranked the next time, there's enough air coming into the combustion chamber to start the car. So either the ECM is not "sending" the command, or the IAC is not "responding" to the command?? It sucks that replacing an ECM is the only way to determine fault:( Quote Link to comment Share on other sites More sharing options...
gmrulz4u Posted June 1, 2004 Author Report Share Posted June 1, 2004 if the LEDs on the A/F gauge are not moving, wouldn't that indicate that the engine is not operating in closed loop? Not exactly...the ECM is still operating in Closed Loop otherwise I wouldn't get the SES light at all...no O2 codes will ever get set unless the engine is operating in Closed Loop... As well, I used to always use my friends Snap-ON Scanner while I was driving and it would always go into Closed Loop at the proper timing intervals... My O2 has been doing this for months now...and I haven't noticed any drops in gas mileage at all?? Quote Link to comment Share on other sites More sharing options...
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