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Austin GS

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  • Lexus Model
    06 Lexus GS

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  1. Hey T2LEX, did you ever figure out what was going on? Sounds like it may be the same issue I have been having with my '06 GS. Here's the link to the thread on my issue: http://us.lexusownersclub.com/forums/index...showtopic=61948
  2. No ideas, huh? I've taken it to the dealer twice in addition to another shop. No one can figure out what's going on. It's intermittent, so very difficult to troubleshoot. On average, the misfires happen about twice/month. Always on cold start. I have been resetting the codes myself when the misfires happen, and the car runs fine.
  3. Any other updates? I started another post here about a similar issue with check engine/VSC lights coming on. I have had the gas cap replaced by the dealer, but it did not fix the problem.
  4. Bought a used 2006 GS300 about 4 months ago. After about 1 month, the check engine light came on in addition to the Check VSC message. Took it to the Lexus dealer, and they replaced the gas cap (multiple posts in this forum about the gas cap issue). After a week or so, check engine/VSC came back on. After a second visit to the dealer, they suggested that I had bad gas. This sounded ridiculous since I always fill up with 93 octane Exxon. Anyway, went through two tanks of gas, and still getting the check engine/VSC. I'm always careful to screw the new cap down to at least 2 clicks on every fill up. Finally broke down and bought an OBDII tool to check the codes, and it showed P0300 (random cylinder misfires and multiple other P030x codes (misfires on all cylinders). After resetting the codes, I have noticed/felt misfires on cold starts, followed by the check engine/VSC coming on. Also seems like my fuel economy is lower than normal (averaging about 18.3 mpg in mixed city/hwy use), and also have carbon buildup on tailpipes (running rich?). Have replaced the spark plugs and battery, but check engine/VSC lights keep coming on. Had a local shop test for a vacuum leak, but they didn't find anything. Seems like any issues with the MAF sensor, O2 sensor(s), or other air/fuel delivery systems would trigger other codes. Any ideas?
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