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Old 01-20-2012, 11:55 PM   #1 (permalink)
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Default 328GTS poor idling

Hi, my 328 starts normally then it slows down to about 700rpm. Throttle response is poor but will pick up revs slowly and run normally at higher revs. It has a microplex ECU and I have done the testing and all within spec. The tdc sensor voltage is above the 0.2V minimum with a reading of 0.3V. There are no vacuum leaks. Any advice on changing the tdc sensor or should I look elsewhere?
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Old 01-31-2012, 12:25 AM   #2 (permalink)
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Verify the three settings on the TPS sensor. And check
the O2 sensor also. (Remember the correct FV duty cycle
is 50% with engine hot and O2 sensor disconnected.)
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Old 06-03-2012, 11:28 PM   #3 (permalink)
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First of all check the air filter and spark plugs, if they goes bad then you will have the bad idling problems.I think you will have to give your car for regular scheduled tuneups which will include transmission checks, oil changes, tire rotations.
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Old 06-20-2012, 02:30 AM   #4 (permalink)
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Quote:
Originally Posted by bblackh1 View Post
Verify the three settings on the TPS sensor. And check
the O2 sensor also. (Remember the correct FV duty cycle
is 50% with engine hot and O2 sensor disconnected.)
Agreed. Also check co when hot, if it's to rich then it'll be mega rich when cold. Don't worry about cps, it won't cause this issue. Also, try disconnecting the cold start injector and try another completely cold start cycle, this will indicate a rich mixture issue.
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Old 07-08-2012, 11:59 PM   #5 (permalink)
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Poor idling is because of so many problems like carburetor has bad accelerator pump or power circuit then replace the accelerator pump, check the vacuum leak and replace if required.
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Old 11-07-2012, 07:54 AM   #6 (permalink)
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No Floats or jets there...ITS FUEL INJECTION...!!!!!
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