Have a new to me ‘99 Land Cruiser 285k miles with a good dealer service history. Did some basic maintenance this weekend and now have a fast idle that I can’t figure out.
1. Disconnected battery terminals and cleaned. Left disconnected over 30 minutes to reset ECM
2. New OEM air filter
3. Cleaned MAF Sensor with CRC MAF cleaner (careful not to touch the electrodes)
4. Cleaned the throttle body with CRC throttle body cleaner. Did not remove from engine, just held butterfly open manually with my fingers.
5. Reconnected battery terminals putting dielectric grease on the posts first.
Started up with an initial idle around 2,000 RPM, after a while idling in park it dropped down to the 1,400-1,600 range and seems to have settled in there. In gear idles around 1,000 or little higher. Drove it around town and on the highway for 30-40 miles and no change.
Not picking up any codes with my scan gauge.
Today I disconnected the battery again and let the ECM reset with same results. Inspected all vacuum hoses and they all are connected and look good with no cracking. Throttle body butterfly is not tight against it’s back stop with key off (has a little movement when I push back at the bottom but not much). Compared that with the throttle body butterfly on my ‘02 LX470 and about the same. Took the MAF sensor off my LX470 and put that on the Land Cruiser, disconnected battery to reset the ECM. Same result, with initial 2,000 RPM then settling in at 1400-1600. So I think I’ve ruled the MAF sensor out as the culprit.
Before doing all of the above the
Park was in the 700-800 RMP range.
Any ideas on what might be causing my fast idle?
1. Disconnected battery terminals and cleaned. Left disconnected over 30 minutes to reset ECM
2. New OEM air filter
3. Cleaned MAF Sensor with CRC MAF cleaner (careful not to touch the electrodes)
4. Cleaned the throttle body with CRC throttle body cleaner. Did not remove from engine, just held butterfly open manually with my fingers.
5. Reconnected battery terminals putting dielectric grease on the posts first.
Started up with an initial idle around 2,000 RPM, after a while idling in park it dropped down to the 1,400-1,600 range and seems to have settled in there. In gear idles around 1,000 or little higher. Drove it around town and on the highway for 30-40 miles and no change.
Not picking up any codes with my scan gauge.
Today I disconnected the battery again and let the ECM reset with same results. Inspected all vacuum hoses and they all are connected and look good with no cracking. Throttle body butterfly is not tight against it’s back stop with key off (has a little movement when I push back at the bottom but not much). Compared that with the throttle body butterfly on my ‘02 LX470 and about the same. Took the MAF sensor off my LX470 and put that on the Land Cruiser, disconnected battery to reset the ECM. Same result, with initial 2,000 RPM then settling in at 1400-1600. So I think I’ve ruled the MAF sensor out as the culprit.
Before doing all of the above the
Any ideas on what might be causing my fast idle?