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Author
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Topic: Question about MIL Eliminators...Engine in "SAFE MODE"
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03SVTPower
CAFords OG
Member # 518
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posted
 
 
if you have a offroad h pipe and your car has the check engine light on, does it tell the computer to run in "safe mode" and not properly mix the air to fuel ratio...or something like that? ![[Confused]](confused.gif)
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2003 Redfire "AED" Cobra R.I.P
Posts: 3481 | From: Nor-Cal | Registered: Oct 2001
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Quick 88LX
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Member # 1950
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posted
well, from what I know, all the check engine light does is annoy the driver until they fix the problem and make the light go away. Other than that, all the light is telling you and your cars computer is what it is detecting as a problem. So when your light comes on, it not only is telling YOU there is a problem, but it is also telling your computer there is a problem for future diagnostics. But if YOU KNOW the light is on because you installed an off road h pipe or something liek that, then don't worry about it unless that orange light really does bother you. Or get some MIL eliminators ![[Big Grin]](biggrin.gif) ![[patriot]](graemlins/patriot.gif)
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"Men are Made, Not Born"
Car Picture : http://www.angelfire.com/theforce/quick88lx/
Original Member #495. Can I get my number back?
Posts: 1785 | From: Fairfield, CA/Okinawa, Japan | Registered: Oct 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
quote:
Originally posted by 98StangPower:
if you have a offroad h pipe and your car has the check engine light on, does it tell the computer to run in "safe mode" and not properly mix the air to fuel ratio...or something like that?
YES your car does run in safe mode if the "Malfuncition Indicator Light"(MIL) is on...
This is especially true in 96+ cars...96+ cars have OBD II computers, OBD II computers were developed to keep up with the strict smog laws...When your engine is in safe mode it retards timming and changes other veribles(which limit horse-power) becuase it does not have the information to give it peak performance(Example:Bad O2 signal with an "off-road H-pipe")....
OBD II cars have four O2's..The reason for this is to detect a malfuntioning catlytic converter..
One O2 is located infront(upstream) of the "cat" and one is located behind(downstream)of the "cat"..When you remove the cat the O2's tell the computer that something is wrong with the cats..
Thats why you need MIL eliminators...
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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03SVTPower
CAFords OG
Member # 518
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posted
quote:
Originally posted by Black94 5.0:
quote:
Originally posted by 98StangPower:
if you have a offroad h pipe and your car has the check engine light on, does it tell the computer to run in "safe mode" and not properly mix the air to fuel ratio...or something like that?
YES your car does run in safe mode if the "Malfuncition Indicator Light"(MIL) is on...
This is especially true in 96+ cars...96+ cars have OBD II computers, OBD II computers were developed to keep up with the strict smog laws...When your engine is in safe mode it retards timming and changes other veribles(which limit horse-power) becuase it does not have the information to give it peak performance(Example:Bad O2 signal with an "off-road H-pipe")....
OBD II cars have four O2's..The reason for this is to detect a malfuntioning catlytic converter..
One O2 is located infront(upstream) of the "cat" and one is located behind(downstream)of the "cat"..When you remove the cat the O2's tell the computer that something is wrong with the cats..
Thats why you need MIL eliminators...
The MILs are placed on the front or the rear O2 sensors?
Thanx for the info. ![[worship]](graemlins/worship.gif)
[ February 17, 2003, 05:24 AM: Message edited by: 98StangPower ]
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2003 Redfire "AED" Cobra R.I.P
Posts: 3481 | From: Nor-Cal | Registered: Oct 2001
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Quick 88LX
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Member # 1950
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posted
In the rear. When you buy them, the instructions even say IN BOLD to put them in the rear. That will solve all your problems my man ![[burnout]](graemlins/burnout.gif)
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"Men are Made, Not Born"
Car Picture : http://www.angelfire.com/theforce/quick88lx/
Original Member #495. Can I get my number back?
Posts: 1785 | From: Fairfield, CA/Okinawa, Japan | Registered: Oct 2002
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03SVTPower
CAFords OG
Member # 518
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posted
quote:
Originally posted by Quick 88LX:
In the rear. When you buy them, the instructions even say IN BOLD to put them in the rear. That will solve all your problems my man
I didnt get any instructions with mine... But thanx for letting me know they go on the back.
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2003 Redfire "AED" Cobra R.I.P
Posts: 3481 | From: Nor-Cal | Registered: Oct 2001
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punkrawkdude99
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Member # 2427
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posted
95% of the time check engine light comes on due to an emissions problem
Posts: 34 | From: Northridge, CA | Registered: Feb 2003
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cobraracer46
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Member # 1142
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posted
No, your mustang will not run in safe mode when the MIL light is on for anything except an over temp condition. My MIl light comes on occasionally because I have not had the time to make some MIL eliminators, but the light coming on is no big deal for me, I just turn the light off. I don't feel any performance diffrence what so ever when my light comes on. your mustang will run in safe mode only when the PCM detects an engine over temp condition. Basically what happens is that the PCM will cut out every other cylinder so some cylinders can pump in air and cool down the motor..
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2001 SVT cobra convertible with a Viper T56, Fikse wheels, Griggs frame kit, roll bar, Vortech, 4:30 gears, brembo GT brakes and more.
Posts: 1172 | From: Woodside California | Registered: Apr 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
quote:
Originally posted by cobraracer46:
No, your mustang will not run in safe mode when the MIL light is on for anything except an over temp condition. My MIl light comes on occasionally because I have not had the time to make some MIL eliminators, but the light coming on is no big deal for me, I just turn the light off. I don't feel any performance diffrence what so ever when my light comes on. your mustang will run in safe mode only when the PCM detects an engine over temp condition. Basically what happens is that the PCM will cut out every other cylinder so some cylinders can pump in air and cool down the motor..
OBD-II monitors the operation of the catalytic converters by a double set of heated exhaust gas oxygen sensors (HEGOS or O2). Comparing the oxygen content of the exhaust gas entering the converter with the oxygen content of the exhaust gas exiting the converter. OBD-II reports and stores catalytic conversion activity.
If you remove the catalytic converters, the oxygen content will be the same between the 02 sensors. Shortly after OBD-II will intercede and the CHECK ENGINE light (MIL) will illuminate. If you ignore the CHECK ENGINE light LONG ENOUGH, OBD-II will enter LOS (limited operation strategy) or "limp home mode/Safe mode".
How well do you think that you car is gonna run with the wrong O2 voltage?..
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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cobraracer46
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Member # 1142
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posted
The car will run just fine with a cat effiency code. I know for a fact, my 01 Cobra runs the same when the check engine light comes on because the PCM detected a cat failure. The PCM uses the front o2 sensors for fuel trim, not the rears. The rear o2 sensors are only used to monitor the cat converter effiency.
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2001 SVT cobra convertible with a Viper T56, Fikse wheels, Griggs frame kit, roll bar, Vortech, 4:30 gears, brembo GT brakes and more.
Posts: 1172 | From: Woodside California | Registered: Apr 2002
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Teddy Tiger
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Member # 2473
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posted
How about a pair of decent high flow cats? I'm assuming they work well enough to keep the PCM happy...
Nick
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2008 Mustang GT 'Premium'
Vista Blue Metallic
Interior Upgrade, Comfort Group
Charcoal Leather Interior
Shaker 500 Stereo
Posts: 167 | From: Lafayette, California | Registered: Feb 2003
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
quote:
Originally posted by cobraracer46:
The car will run just fine with a cat effiency code. I know for a fact, my 01 Cobra runs the same when the check engine light comes on because the PCM detected a cat failure. The PCM uses the front o2 sensors for fuel trim, not the rears. The rear o2 sensors are only used to monitor the cat converter effiency.
Why would you run your car with the MIL light on?....Arent you worried that it might be on for some reason other than the O2's?...
How long have you had your MIL on for, before you reset it??.....When an OBD II computer has a MIL on for a while, I'm 99% positive it goes into "safe mode"..Maybe your MIL was not on long enough...
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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cobraracer46
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Member # 1142
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posted
quote:
Originally posted by Black94 5.0:
Why would you run your car with the MIL light on?....Arent you worried that it might be on for some reason other than the O2's?...
How long have you had your MIL on for, before you reset it??.....When an OBD II computer has a MIL on for a while, I'm 99% positive it goes into "safe mode"..Maybe your MIL was not on long enough...[/QB]
I have the exact same scan tool that Ford dealers use, so when my light comes on, I know what it is for. The longest time I let the MIL light shine was 1 full day. I think I will finnaly get around to making my MIL eliminators this weekend. ![[Wink]](wink.gif)
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2001 SVT cobra convertible with a Viper T56, Fikse wheels, Griggs frame kit, roll bar, Vortech, 4:30 gears, brembo GT brakes and more.
Posts: 1172 | From: Woodside California | Registered: Apr 2002
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03SVTPower
CAFords OG
Member # 518
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posted
quote:
Originally posted by Teddy Tiger:
How about a pair of decent high flow cats?
Nick
Then that takes away from all the fun...
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2003 Redfire "AED" Cobra R.I.P
Posts: 3481 | From: Nor-Cal | Registered: Oct 2001
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