ulrace
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91 ls400 Runs perfectly when dead cold. When it warms up (just a few blocks of driving) It starts to miss of and on when at a steady speed. under acceleration it runs great.
The tach seems to read about 1/2 the actual rpm all the time. Needle jumps when the miss starts. Anbody have any ideas? I have a code 13 . New plugs and wires already.
thanks
bob
Tach Reads 1/2 Speed
in 90 - 00 Lexus LS400
Posted
My best guess is that the tach reads from the cam sensors which are located behind the distributor rotors. These are not easy to access as you have to get down to the timing belt with the cover off the front of the engine to access the caps. If there is an easier way someone please help? i am going to try unplugging each sensor and checking codes then. Thansk for the idea; we are on the same track.
bob