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check eng light

  #1  
Old 11-15-2007, 03:59 PM
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Default check eng light

How long does the check eng light stay on?? I didnt put the gas cap back on right. I5 motor
 
  #2  
Old 11-15-2007, 05:17 PM
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Default RE: check eng light

what a loaded question...here goes...class,pay attention..lol



gas cap loose...pcm runs a vacuum check on tank and discocers it....lite on.....

you tighten cap..


ok..ahem..


the pcm must run and see a "pass" 3 times on the tank.it uses a purge solenoid to pull vacuum on the tank,and see if it holds.

however...there is criteria BEFORE the pcm will ever even run test #1..

the tank must have over 1/4 tank gas in it.

the tank must be at least 1/4 empty

the ambient temp must be somewhat warm...not sure on the exact number

the engine must be brought to operating temp

of course,your trip is long enough for it to run


all that must be met before it tries test 1...THEN the car must be completeley powered down and cooled off before the next trip for test 2 to occur....

so...if you keep your gas tank full...it will never run

keep it empty.it will never run

make short trips,it will never run

on avberage,I'D say 3 days is a normal time for it to clear
 
  #3  
Old 11-15-2007, 05:44 PM
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Default RE: check eng light

Argon thanks for all your info! Are you & myself the only 2 on this forum????????????? Never see anyone else !!!!!!!!
 
  #4  
Old 11-15-2007, 06:42 PM
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Default RE: check eng light

look on the right at top 10 posters...they check in quite a bit...

aldso a bunch of new guys from a defunct forum are around as well
 
  #5  
Old 11-16-2007, 04:50 PM
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Default RE: check eng light

the light went out on the way home this afternoon!!!!!! THANKS AGAIN!!!!!!!
 
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