I'll start off that my car has 115,000 miles. Mobil 1 syn oil change every 5k. Complete tune-up at 100k...
Now recently during driving on the highway, at a constant speed, the CEL will come on. Stay on for about 10-20 seconds, then turn off. It would do this randomly. So when I got home I ran the Key On - Engine Off codes. The only thing it came up with was code 551 - Idle Air Control (IAC) circuit failure. Then on Key On - Engine Running code given were: 411 - Cannot Control RPM during KOER low RPM check.
I have had a few instances when the car would stall out sitting at a light, so I would assume this to be the problem with the IAC. But what causes the bogging while accelerating? It tends to go away once I hit the 3850 mark, or whatever the RPM is where the secondaries open up..
So what I ask of you tech guys out there, what are your suggestions or ideas of what is going on here? Any help
would be greatly appreciated. Thanks!
