93 ls400- Electrical Knocking????
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Joined: Jun 2011
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From: KY
93 ls400- Electrical Knocking????
so i started it up and i got this knocking sound, and it was knocking in a pattern (4-5 knocks, silent, repeat). so i turned off the car and just turned on the electrical components and the knocking started up again.. any ideas???
problem may have started after i pounded the dash to get my needles working
problem may have started after i pounded the dash to get my needles working
Last edited by vicious; Jul 9, 2011 at 07:53 AM.
Lead Lap
Joined: Jan 2007
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From: UK
Could you be a little more specific for example where is the knocking sound coming from front or rear? If the front have you lifted the hood got someone to turn on the ignition and had a listen for the location of the noise?
At the moment it could be someone locked in the trunk trying to get out.
At the moment it could be someone locked in the trunk trying to get out.
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From: KY
Could you be a little more specific for example where is the knocking sound coming from front or rear? If the front have you lifted the hood got someone to turn on the ignition and had a listen for the location of the noise?
At the moment it could be someone locked in the trunk trying to get out.
At the moment it could be someone locked in the trunk trying to get out.
it sounds like its near the drivers side air vent next (by the pedal). thats where im feeling the most vibration from the knocking
its def somewhere under my dash
Last edited by vicious; Jul 9, 2011 at 07:54 AM.
Pole Position
Joined: Dec 2009
Posts: 3,278
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From: ct
It sounds like it might be on your heater assembly, one of the gears that opens the doors for the vents might have a tooth missing or the servo motor could be stuck to run constantly. There's alot of servo motors on the assembly to adjust the air flow through all the different ducts. Try setting your HVAC to defrost (windshield), then heat (feet), then vents, all the different settings.
Pole Position
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From: KY
thanks for the help
saw somewhere on here talk about coolant so looked at the reservoir and saw it was low. filled it back up, unplugged the climate control (no noise when it was unplugged) plugged it back in, turned it on and the noise was gone.. not sure if it was the coolant or the climate control unit but at least its gone
saw somewhere on here talk about coolant so looked at the reservoir and saw it was low. filled it back up, unplugged the climate control (no noise when it was unplugged) plugged it back in, turned it on and the noise was gone.. not sure if it was the coolant or the climate control unit but at least its gone
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Pole Position
Joined: Dec 2009
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From: ct
https://www.clublexus.com/forums/ls4...ater-core.html
vicious; good that it's not making the noise anymore, it might have just been some wires or something rubbing against the bar which moves the doors for the vent which you got out of the way when you took out the HVAC controls.
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