high idle after spark plug change
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Rookie
Joined: Jul 2003
Posts: 52
Likes: 1
From: California
high idle after spark plug change
Hi everyone, I just changed my spark plugs on my 99 gs300 to denso iridium and now the car idles at around 1200 rpm. Why is this happening, someone please help.
Driver
Joined: Jan 2002
Posts: 113
Likes: 0
From: Michigan
I just changed my plugs this weekend. Is there a possiblity that something dropped into the throttle drum area and worked its way down beneath it... the one that your throttle cable connects to??? I suggest you take the plastic cover off, take a flashlight, and hand operate the throttle by pushing down on the throttle cable... did I mention "with the engine off". Carefully look around this drum and see if anything is causing it to bind. My spark plug change did not affect the idle at all..... it just improved performance 
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Driver
Joined: Jan 2002
Posts: 113
Likes: 0
From: Michigan
Whoops..... I thought you had a gs400, thats what I have. Although the 300 has a similar setup. I wonder if when you removed the read shield over the plugs, something.. dirt, etc, worked it's way south of the throttle spring????
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