Hello, my car is throwing a CEL again. It's a new error code, which is: P0506 Idle Control System RPM Lower Than Expected How can this be fixed, can a tune adjustment be done to fix this or what? Is this something that my tune isn't handling right? I have an 05 Mustang GT, automatic transmission. My mods are: TBS - throttle body spacer Steeda CAI w/ a Tune, 90mm SLP Loudmouth exhaust Kooks Long tube headers w/ catted x-pipe. In that order of when I put things on. Now someone mentioned this to me, let me know what everyone else's thoughts are: Is that something I'm going to have to do? instead of just correcting this in a tune? I hope i odn't have to replace my throttle body, that would suck, plus, i don't know if I can get that under warranty, with all my mods, I mean, it's one thing to take out the CAI, but what about the headers, etc..
you can either raise the idle rpm in the tune and see if that helps.. or try and see if your TB spacer is what is causing the problem.
the throttle body spacer was my first mod and I've had that on for quite some time up until now. I first got that, then I got the CAI, and then abotu 6 months later i got the headers, etc... that cel never came on with that code before. So i dont' think it's the TBS. This error code has just recently been thrown ever since i have gotten the headers put on, etc.. but i guess it still could be, i don't know, just don't think it is.
*bump this code never popped up prior to my headers being installed, so i'm wondering if it's just needing a tune adjustment? I can't imagine needing the idle control sensor needing to be replaced.
i got the tune from mustangtuning.com, but the car was still running too lean because they set the tune up for the 80mm of the steeda CAI and not the 90mm. So while I was trying to get them to fix my tune, by adjusting it a couple of times, I was over at sctflash.com and Ryan over there helped me out on the first try! he knew exactly what was the problem, so he adjusted my tune to the 90mm and walla! it worked. Then I got the headers installed, which doesn't require a tune, but now i get this idle lower than expected code, and now some people are telling me that it's the throttle body that needs to be replaced. someone already posted, like i had shown above, where they had to replace the throttle body. and someone mentioned this too me: "Contact your tuner and ask him if there is something on the tune that can trigger that or if he has seen it before. If you can't reach anybody then I would put your car to stock. Take off Intake and retune the comp with the stock tune and see if the CEL comes back on and if it does take it to the dealer and if it doesnt then there something wrong with the tune. Just my .02 Good Luck Man" But i have a bad feeling it's the throttle body, who knows. maybe i only feel that way cause it's the worst case scenario.
Okay, so after I put my long tube headers on, kooks, is when this code started to come up, i would say a few weeks later, maybe a month later. But I checked the way my car was idling, so here is some info for you. As soon as I start her up, the needle swings up high to 1500 RPM's. It sits there for about 10 seconds maybe, and then it starts to come down to about 1,000. When I'm driving it, and I come to a stop light, with my foot on the brake, it sits around 800 (can't tell for sure, but that's close, 750 - 900). Then I checked what it would be when I was in park, just sitting there, when I got to work before turning the car off and it was at 1,000 (when in park). Is this too high? Or is it maybe too high for what my tune is for, so the idle sensor is throwing that code, as in P0506 Idle Control System RPM Lower Than Expected - meaning, your tune has an idle for this, but the car itself is really idling at this? make sense.
