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Good points!
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Posted by David Ingram (more from David Ingram) on Fri, 22 Feb 2013 06:16:50 Share Post by Email
In Reply to: Re: Living In LHM World, dref, Thu, 21 Feb 2013 21:08:58
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Just one important correction, which is that disconnecting the vacuum line from the TB would actually insure the heavy throttle pedal rather than relieve it.

The TCS system operates on intake vacuum pressure. When it detects a bug in the works, the safety valve dumps the vacuum. There's a spring inside the TB which, in the absence of vacuum acting against it, overpowers the motor in the TB, resulting in that heavy feeling.

When the turbo's boosting, intake pressure will go from negative to positive, and the check valve prevents this positive pressure from disrupting TCS operations. Flow should only go FROM THE TB TO THE MANIFOLD.

I know you've probably checked everything and it's all as it should be, but the failure immediately after lines replacement certainly is a coincidence. Routing of lines or check valve are certainly the expected diagnoses!

To answer your main question, no, you won't do any serious damage to anything. You can expect crummy fuel mileage. There might be raw fuel going into the catalytic converter, which given enough time could core that thing out. Again, I don't see that as likely.

The car will be running around in a baseline fuel mapping. I don't mean base boost, I mean a basic fallback fuel mapping in the LH ECU (or Trionic in later cars). Since the TB isn't sending a plausible signal, the fuel injection system lacks information for its normal operations.

You'll see a P0120 Throttle Body code among the LH error codes due to this missing TB signal.

Finally, there's nothing an ISAT can do that a Tech II cannot. At least that's my understanding.

Good luck!

posted by 24.193.243...

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