its so hit and miss,drive around at not over 50 mph with o.d.on can shift all gears up and down over and over perfect. 1 hour later building up to freeway speed, no o.d. at any normal o.d. shift point for 30 miles + or - then trying again with button clicked on it shiftsits so hit and miss,drive around at not over 50 mph with o.d.on can shift all gears up and down over and over perfect. 1 hour later building up to freeway speed, no o.d. at any normal o.d. shift point for 30 miles + or - then trying again with button clicked on it shifts
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a transmission problem. (slip>?)
why not?
1: check all fuse with a meter, in both fuse boxes.
2: check ATF levels by the book, not guessing or using engine oil methods !
3: then SCAN it. yes, do so , not scanning now, misses the boat.
no year stated, wow...... now that does make this a hard row to hoe.
Usually the overdrive should just be left on. It should only come into play when you are at high speeds above 50mph. This is essentially your "5th Gear" and should increase fuel economy. If you leave the overdrive "OFF" on the highway your engine RPM will be higher causing the fuel economy to suffer.
Over Drive..... Generally speaking, overdrive (OD) is the highest gear in the transmission. Overdrive allows the engine to operate at a lower rpm for a given road speed. This allows the vehicle to achieve better fuel efficiency, and often quieter operation on the highway. When it is switched on, an automatic transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [43+ mph] depending on the load). When it is off, the automatic transmission shifting is limited to the lower gears. For an automatic transmission, it is almost always best to select overdrive and allow the transmission to control engagement of the overdrive. (It may be necessary to switch it off if the vehicle is being operated in a mountainous area or when towing a trailer.) With a manual transmission, overdrive should usually be selected when the average speed is above 70 km/h (approx. 43 mph).
What is your speed at 3k rpm? What rpm would you estimate was previously 'normal' for highway cruising? If your Lexus is auto trans, it could be two things, it's either not shifting into the highest gear, or it's possibly slipping in gear (although I would think that would cause the rpms to fluctuate, not stay at a steady 3k). If it's a stick shift, again, it could be clutch slippage, but my choice from your description would be not shifting into the highest gear. Bring it up to highway speed slowly, counting how many shifts it makes, I.m guessing it's a 5 speed auto, but I'm not sure about that.
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