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Intermittent misfire after startup

 
Old 05-07-13, 12:34 PM
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98GS430
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Default Intermittent misfire after startup

I have a 2007 GS350 which intermittently runs rough with engine misfires after a cold startup. After the cars been sitting for a while then driven, the RPM's will drop from 600 to 500 or so and fluctuate when idling in gear.

I've seen the GS300 has a CSP program for carbon buildup and a piston ring repair. Has anyone had the same issue with a 350?
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Old 05-07-13, 12:52 PM
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When was the last time you replaced spark plugs and air filter? If you haven't I would do so
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Old 05-16-13, 11:11 AM
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The air filter is new. I dont think the plugs have been replaced yet. I doubt it would be the plugs though, wouldnt it have a misfire all the time then? This is a pretty intermittent problem.
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Old 05-16-13, 11:48 AM
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Originally Posted by 98GS430 View Post
The air filter is new. I dont think the plugs have been replaced yet. I doubt it would be the plugs though, wouldnt it have a misfire all the time then? This is a pretty intermittent problem.
Nope plugs can give you a misfire and clear up. Are you getting any check engine lights? You may aswell do a top engine cleaning, and cleaning of the throttle body. Those do get dirty! That too can cause a misfire at start up.
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Old 05-16-13, 12:19 PM
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when I read the title "misfire" I think of the 350 right away. But I see your sn is 430, I want to check it out cause mine is GS430 too. Now I see it is actually 350.

Goodluck buddy.
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Old 05-29-13, 02:09 PM
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The problem seems to be getting worse, the car acts an awful lot like the 300's with the bad piston rings. This worries me.
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Old 05-29-13, 02:22 PM
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Replace plugs, top engine clean, and clean throttle body. When I pulled my throttle body out it was filthy.
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