Fuel system flush - a mistake, help!
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Shortly after I bought my 01 UL, I was persuaded by the auto shop to flush the fuel system. Although it's not terribly noisy, it's never been as quiet as before!! I'm not sure what went wrong, and I don't think the flush can be "undo" anyway. Anyone had experience with this or have any suggestion?
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Maybe they were thinking about the filters that get clogged when the tank is overfilled. I'v heard something about this problem, and was quoted something like $2500 for repairs. Was cautioned by several people to not overfill the tank.
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The flush is basically cleaning of the fuel injection system according to the service guy. I wouldn't be surprised if they bleeded out the fuel system and repressurized it. The engine has become noiser since then, which I remember vaguely that it was indeed very quiet prior to that.
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The flush is basically cleaning of the fuel injection system according to the service guy. I wouldn't be surprised if they bleeded out the fuel system and repressurized it. The engine has become noiser since then, which I remember vaguely that it was indeed very quiet prior to that.
This type of service is a big money-maker for maintenance and repair shops though because they use about $5 worth of product and charge about $200 for the job.
Also, re: your comment above, the fuel system de-pressurizes over a period of time (duration varies depending upon the vehicle, but it's generally not longer than a couple hours or so) after you cut off the engine (and hence the fuel pump). It repressurizes the moment you switch on the ignition and the pump starts. Some shady service guy may make it sound like this "repressurization" is a special process that you should pay them for. LOL
Re: the increased noise you mention, what does it sound like? Is it a ticking sound, or what?
Last edited by I6turbo; 06-03-09 at 12:42 PM.
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Let me apologize for my poor word choice. By saying engine "noise" what I really mean is the engine sound being too noticeable. That's no strange noise such as ticking. However, I can now easily hear every bit of engine sound whenver I step on the gas even with light push. I still remember in the past the engine was so quiet that its sound became noticeable only if I really stepped on the gas hard to get to a higher RPM range. But again for a non-Lexus owner, it may appear normal to them since they have no clue how quiet a typical LS430 engine SHOULD be. Hope that helps to clarify my question.
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BTW, I didn't bother to bring the car back to the shop because that will definitely seem normal to them (of course, if compare with other average car on the road!)
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Let me apologize for my poor word choice. By saying engine "noise" what I really mean is the engine sound being too noticeable. That's no strange noise such as ticking. However, I can now easily hear every bit of engine sound whenver I step on the gas even with light push. I still remember in the past the engine was so quiet that its sound became noticeable only if I really stepped on the gas hard to get to a higher RPM range. But again for a non-Lexus owner, it may appear normal to them since they have no clue how quiet a typical LS430 engine SHOULD be. Hope that helps to clarify my question.
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turbo's probably right - if they didn't put the air cleaner assembly back on properly (or left out the air filter!) you will hear intake noise much more than you did before. Let this be a lesson to you - never fall for the BS 'Flush' procedures. Your tranny doesn't need to be flushed and neither does your fuel system. Brake system? Yes.
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