My Lexus LX450 idles at 1800 when hot. I'm having trouble adjusting. Could there be other problems causing this?
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1800 is high enough that I'd really carefully check all the cables, linkage, return springs, etc.My Lexus LX450 idles at 1800 when hot. I'm having trouble adjusting. Could there be other problems causing this?
Thanks for the assessment. I will re-check everything. I agree, I think something is keeping the throttle plate from closing. The strange thing is this only happens when it is hot, like hot outside, in hot weather.1800 is high enough that I'd really carefully check all the cables, linkage, return springs, etc.
Hard to get an idle that high just from a vacuum leak, etc. More likely something's keeping the throttle plate from completely closing.
Thank you, Good info. I can see where this could be the case. And yes, I have been doing the "cheapest thing first" approach.Yeah I fought this issue for a while, from a "cheapest thing first" approach.
Adjusting works to a point. Generally what happens in that case is that you have to adjust the cable "up" at cold start to get good idle, then back "down" to get good idle when hot.
Ultimately I determined it was (non-fixable) drag in the cable and pedal assy ('93 model)
FWIW here are the part #s, should get you close for Lexus unit.
1 - 78120-60080 - Rod Assy, Accelerator Pedal (vintage part was unspeakably stiff to depress, very worn pivot (300kmi))
1 - 35520-60110 - Cable Assembly, Throttle (vintage part showed obvious signs of significant deterioration on the outside)
Did you notice peddle was still to initially move?Yeah I fought this issue for a while, from a "cheapest thing first" approach.
Adjusting works to a point. Generally what happens in that case is that you have to adjust the cable "up" at cold start to get good idle, then back "down" to get good idle when hot.
Ultimately I determined it was (non-fixable) drag in the cable and pedal assy ('93 model)
FWIW here are the part #s, should get you close for Lexus unit.
1 - 78120-60080 - Rod Assy, Accelerator Pedal (vintage part was unspeakably stiff to depress, very worn pivot (300kmi))
1 - 35520-60110 - Cable Assembly, Throttle (vintage part showed obvious signs of significant deterioration on the outside)
What is your cold start rpm? It should only go to roughly 1200 rpm for a minute or less then slowly drop to its 650 idle rpm.Thanks for the assessment. I will re-check everything. I agree, I think something is keeping the throttle plate from closing. The strange thing is this only happens when it is hot, like hot outside, in hot weather.
remove the TB its the only way to clean it properly, especially the back of the butterfly and ensures all the crud doesnt go into the intake manifold.Thanks everyone for your feedback. I do think the throttle cable is worn and needs replacement. I also want to clean the IAC. It looks to me that I will have to remove the throttle body in order to remove the IAC. I was trying to be lazy and just remove the IAC but I can't see any way to remove the lower screw. Any suggestions or do I just bite the bullet and remove the whole throttle body?