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Author Topic: Rich on start  (Read 13901 times)

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GTRS Fiero

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Rich on start
« on: July 27, 2019, 07:46:35 pm »
My Fiero runs rich when starting--even after running for 300 miles, which should be sufficient to warm it up.  Basically, if I start it when cold, it runs rich.  If I run 300 miles, shut it off, then start it, it runs rich.  Is the CTS the likely culprit?
« Last Edit: August 07, 2020, 08:47:26 am by GTRS Fiero »
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Fierofool

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Re: Rich on start
« Reply #1 on: July 27, 2019, 08:16:19 pm »
That would be my first thought.  What injectors are you using?  Do you still have the cold start injector in place?
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GTRS Fiero

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Re: Rich on start
« Reply #2 on: July 27, 2019, 08:19:18 pm »
Stock 3.4 injectors.  No CSI.
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Fierofool

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Re: Rich on start
« Reply #3 on: July 27, 2019, 08:57:03 pm »
The injectors could be the cause.  I don't know how they react with the 7730.
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There are three kinds of men:

1.    The ones that learn by reading.
2.    The few who learn by observation.
3.    The rest of them have to pee on the electric fence and find out for themselves.    Will Rogers

GTRS Fiero

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Re: Rich on start
« Reply #4 on: July 27, 2019, 09:18:10 pm »
Hmmm.  I have thought they were leaking.  It was the same with the TFS injectors.
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GTRS Fiero

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Re: Rich on start
« Reply #5 on: July 29, 2019, 10:07:56 pm »
Have been discussing this with Ryan.  He seems to think the O2 sensor is the problem, because the CTS tests OK.  I thought that the O2 sensor didn't kick in until the system went into closed loop.  Since this happens irrespective of cold start or warm start, I had ruled out the O2 sensor.

I have a spare O2 sensor, so we'll see.  It is possible that the engine running rich could have fouled the O2 sensor, anyway.
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GTRS Fiero

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Re: Rich on start
« Reply #6 on: August 07, 2020, 08:48:39 am »
It seems to be better with the new programming.
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