LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Engine Vibration at Idle after misfire goes away!

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Old 06-11-19, 03:10 PM
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Shahabi8
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Arrow Engine Vibration at Idle after misfire goes away!

Hi all, I have a 1999 Lexus LS400 with 164k on the clock. Recently, my car got misfire problem with check engine light blinking. I didn't do anything and misfire went away! Now, right at the start up with cold engine, in the steering wheel, I feel engine is shaking harmonically at idle around 900rpm. When engine warms up a bit it runs smoother.
FYI, my car has brand new plugs, cleaned injectors, and new intake manifold gasket and new vacuum hoses.
Old 06-13-19, 02:09 PM
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timmy0tool
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have the code read by an OBDII scanner and report back!

small vibes are very common, and might not be related to a misfire. could be engine/trans mount related!
Old 06-13-19, 02:47 PM
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Shahabi8
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The code I got was P0306. I don't get this code anymore.
Old 06-13-19, 05:21 PM
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Yamae
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Misfires are detected by the signal IGF1 to IGF8. Those are only sending ECU the voltage and the timing. The ECU can't detect the misfire fully by those. It is the often case that the minor surface leakage at the plug or the route to it can't be detected well enough. I worry that you have a minor leakage problem still. I'd check the plug carefully and also swap the igniter for the confirmation.
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