Once the knock sensor is set on the computer tells the fuel injectors to only go to about 60 percent. Or half depending on who you talk to. Check cables and connections first. If these are OK then get another sensor from a wrecking yard and connect it without removing the old one. Then tie it down tight to the intake manifold. Run the engine again and see if the issue goes away. Then decide if you are going to get in the engine and replace the sensor.
Check the 91 Legend for a bad knock sensor. Check the timing for proper setting, and check for any vacuum leaks.
Will it start after setting awhile? Check the crank shaft sensor.
is the computer setting a code or check engine light, if not it could be your crank sensor.
Check engine fuse!
go to auto zone and have them check it for you. its free
have you tried pulling the EFI fuse
Check your maintenance manual. It's in there.
I suspect that you have a bad contact on your speed sensor connector in your transmission. Check connector underneath the car on the driver side, if connector is clean you might need to replace the sensor ( electrical pulse generator ) that's where you plug in the connector...
My turn out to be a air/fuel ration sensor, the problem gave me a check engine light and also a "vsc trac off" and a "vsc trac" light making me think I had a bigger problem. Putting a new sensor in took care of all the lights. 2001 4Runner SR5 4wd.
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