CDsDontBurn
Well-Known Member
On Sunday I took apart my throttle body to clean out the IACV because my car's idle would go from the normal 900 RPM to ~300 RPM whenever at idle. This only happen when the engine was warm though. With a cold engine, this would never happen. My car's acceleration was also a bit bogged down from what I remember when I first got it several years ago. So after doing some searching and asking a few questions, everything pointed to clean out the IACV, so I did that.
I also decided to take apart my intake manifold to clean out the EGR port since it was just an extra 10 bolts or whatever to get to it.
After I got everything put back together, I started up my car and the RPMs shot straight up to 2,500RPM for about 10 seconds or so and then dropped to 1,500 RPM. I originally figured that since I did not remove the battery terminals to clear out the PCM that it was the PCM trying to adjust itself to the cleaned out IACV. Additionally, I thought that there might have been some residual cleaning solutions left in the intake manifold, throttle body, and/or the IACV which may have caused the RPMs to be so erratic. I did some driving at WOT to try and "clear" out any residual cleaning solution left in the intake manifold, throttle body, and IACV. But when I got back home, the RPM pattern had changed to the RPMs jumping between 1,100 RPM - 1,500 RPM whenever in Park or Neutral. If the car is stopped while in gear, the RPMs will remain steady at 1,100 RPM. I know that this is still too high and the RPMs should really be at 900 RPM is everything good. I initially drove my car for about 3 miles right after getting everything put back together and then a few hours later, I drove my car to my cousin's house - a 30 mile trip one way - which I thought for sure would have burned off any remaining cleaning solution and cleared out the PCM to the cleaned out IACV and the RPMs would have corrected itself.
This did not happen and my car's RPMs are still erratic. It still shoots to 2,500 RPM at start and drops to 1,500 RPM after a few seconds from start and then has the RPMs bounce from 1,100 to 1,500 unless in gear which will then stay at 1,100.
I have no idea what I did wrong when cleaning out the EGR port and the IACV yesterday. Do I need to replace the IACV, do I need to clean it out again, or is this something else?
I also decided to take apart my intake manifold to clean out the EGR port since it was just an extra 10 bolts or whatever to get to it.
After I got everything put back together, I started up my car and the RPMs shot straight up to 2,500RPM for about 10 seconds or so and then dropped to 1,500 RPM. I originally figured that since I did not remove the battery terminals to clear out the PCM that it was the PCM trying to adjust itself to the cleaned out IACV. Additionally, I thought that there might have been some residual cleaning solutions left in the intake manifold, throttle body, and/or the IACV which may have caused the RPMs to be so erratic. I did some driving at WOT to try and "clear" out any residual cleaning solution left in the intake manifold, throttle body, and IACV. But when I got back home, the RPM pattern had changed to the RPMs jumping between 1,100 RPM - 1,500 RPM whenever in Park or Neutral. If the car is stopped while in gear, the RPMs will remain steady at 1,100 RPM. I know that this is still too high and the RPMs should really be at 900 RPM is everything good. I initially drove my car for about 3 miles right after getting everything put back together and then a few hours later, I drove my car to my cousin's house - a 30 mile trip one way - which I thought for sure would have burned off any remaining cleaning solution and cleared out the PCM to the cleaned out IACV and the RPMs would have corrected itself.
This did not happen and my car's RPMs are still erratic. It still shoots to 2,500 RPM at start and drops to 1,500 RPM after a few seconds from start and then has the RPMs bounce from 1,100 to 1,500 unless in gear which will then stay at 1,100.
I have no idea what I did wrong when cleaning out the EGR port and the IACV yesterday. Do I need to replace the IACV, do I need to clean it out again, or is this something else?
