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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 01-19-2007, 02:06 AM   #11
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also after i figure out what it is do you think i should get a Adjustable fuel regulator
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Old 01-19-2007, 02:24 AM   #12
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Quote:
Originally Posted by GAMEOVER
also after i figure out what it is do you think i should get a Adjustable fuel regulator
No. AFPR is not the answer right now. First check your STFT And LTFT and o2 reading to make sure you are or are not runnning lean. Second get the PCM tuned to the PLog .

Also...

What are your plugs gapped at?
At what RPM range is your KR starting at?
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Old 01-19-2007, 02:25 AM   #13
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I'm not sure why you would need one. Anything in particular you're thinking of?
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Old 01-19-2007, 09:04 AM   #14
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I see no reason for an AFPR at all. That would only mask your real problem. And you're not outflowing your stock injectors by a long shot.
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Old 01-19-2007, 09:53 AM   #15
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Start by finding and fixing the current issue. Don't buy or think of shotgunning any parts without knowing the current problem is corrected.

If you change anything with the exception of correcting the fueling for your Plog, you introduce more variables and then it will be tougher to find the original cause of the problem.

Is your current fuel pressure within spec?
What are your O2 readings and what RPM do you have KR?
(aka..everything Oldsman asked)
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Old 01-20-2007, 01:47 AM   #16
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Make sure you are using at least 94 octane.

Quote:
First check your STFT And LTFT
What is a normal range for each
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Old 01-20-2007, 05:15 AM   #17
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Quote:
Originally Posted by 2000SilverBullet
Make sure you are using at least 94 octane.

Quote:
First check your STFT And LTFT
What is a normal range for each
The idea is for them to both be at 0. Being more or less than that means the computer is adding or taking away fuel because it sees a rich or lean condition. With a good tune they should be very close if not dead on 0. If your fuel trim is at -3.2 and you go WOT, it will lock in on -3.2 and will pull 3.2% fuel throughout your whole WOT run. This is obviously not good and can cause KR. This is the best way I can think to word it anyways. This can also cause inconsistant 02 readings from run to run and track passes and whatnot because one run it might be adding 5% fuel and the next one it might be pulling 5%.
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Old 01-20-2007, 12:17 PM   #18
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Shawn'* analysis above is only complicated FURTHER by the fact that he'* running a powerlog up front with no injector skew.

This car needs to be FIXED, not bandaided.
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Old 01-20-2007, 12:54 PM   #19
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Maybe a noob question, but when you say "injectors skewed" does that mean reprogramming the PCM so that the front bank runs richer because it is outflowing the rear bank because of the powerlog??
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Old 01-20-2007, 12:57 PM   #20
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Yes.
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