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Old 05-24-2009, 06:19 PM   #1
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tune question

ur mailbox is full.

do i need an updated tune if i switch back to platinum spark plugs?

i currently have the copper one step colder.
but i liked it before when i had the platinums in there.

just want to make sure itll be ok.

ive added a 67mm throttle body since i got your tune also.


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Old 05-24-2009, 06:40 PM   #2
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You are good to go , change to any plug

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Old 05-24-2009, 06:47 PM   #3
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ok and would i need an updated tune for the TB. im going to do a headerback exhaust soon also.
will that need a new tune?
thanks
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Old 05-24-2009, 07:03 PM   #4
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Header back will , TB no , you getting a AF Guge ?

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Old 05-25-2009, 07:40 PM   #5
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is there a way i can watch the fuel trim while im driving?

and too see where exactly it shoudl be at?

i want to make sure everything is good.
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Old 05-25-2009, 07:49 PM   #6
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STFT1 should be above and below 1.000 or close to it

AF isnt near as important as WOT thats what you should worry about , the ECU keeps the idle , part throttle and cruise in check

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Old 05-25-2009, 08:38 PM   #7
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well ok like my o2 sensor problem didnt go away, i just put the brand new motorcraft one in,
the tech from work who did all the work said its just the heater circuit thats bad and that my fuel trim and a/f ratio wit still be monitored and etc by it, its just not heating up for the CEL.
he said it eiither a fuse box problem
harness problem
or possibly ecu damaged.

but he said my A/F should be fine and it will monitor it,
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Old 05-26-2009, 08:04 AM   #8
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Well he is wrong , The heater is there to get enough heat in the o2 for it to properly monitor the passing AF , if it does not heat up then it will NOT work properly until you get up to a heave cruise where the engine temp will heat it enough to get it to work but as soon as you ease off or slow down o2 will stop working again



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Old 05-26-2009, 06:42 PM   #9
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so how do i chck the voltage going to the fuse box and then the harness where the o2 sensor goes?

like which out of the 4 female holes do i check?
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Old 05-26-2009, 06:54 PM   #10
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With a volt meter , check all 4 only one should be 12 volts with the key on

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