4.6 2v chip question
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From: usa
4.6 2v chip question
i was looking at some chips at http://motorhaven.autoanything.com/cgi-bin/Web_store/webshop.cgi?&product=diablochips and was wondering if i bought a chip if i could get it programed to forget about the 4 o2 sensors that have been removed to put on off road h pipe or if it would be better to get plain chip and buy the dmp mil eliminators that trick computer to thinking its all working fine?? ohh ya this is on a 1997 mustang gt 4.6 2v automatic
thnx
1970 f100 390 2wd
1997 mustang gt 4.6
1998 ford expidition 4x4 4.6
thnx
1970 f100 390 2wd
1997 mustang gt 4.6
1998 ford expidition 4x4 4.6
Post Fiend
Joined: Jan 1997
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From: Enjoying the real world.
4.6 2v chip question
Why do you need the O2 sensors turned off, do you need a rich mixture? A richer mixture can be programmed, we've done it before, but I recommended you leave the sensors on unless there is a reason for it (it isn't street legal with them off). Otherwise the Mustang would be running in open loop operation all the time. Open loop is good for the track but the car's ability to adjust its fuel mixture would be gone. Would you prefer a switch chip with open loop operation on one program and closed loop on the other?
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From: usa
4.6 2v chip question
the thing is i bought the car with sensors already removed and check engine light is on and at low idles kinda acts wierd.dont know if matters but car is only driven bout 5 mile every day and would be wanting the most performace not worried about saving gas
Post Fiend
Joined: Jan 1997
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From: Enjoying the real world.
4.6 2v chip question
The reason it acts funny is because with the oxygen sensors removed the car is running in open loop. This basically means that the computer is running in a mode where it just assumes the air/fuel mixture is correct. Without the sensors it cannot adjust for altitude and air temperature (cold air is denser). While we could certainly program a chip for it and probably turn off the check engine light, to get it right you'll need a dyno run with air/fuel ratio checked during the run. A standard chip isn't going to do the job -- a custom program will be needed. I recommend hooking the sensors back up and getting a chip programmed for your needs... you'll get better performance results with the sensors and a properly programmed computer then without the sensors. Plus, not meaning to preach but... we'll all benefit because you're not polluting the air so much.
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From: usa
4.6 2v chip question
would the dmp mil eliminators work i found at this site http://www.partshopper.com/catalog/itemdisplay/514.html
or would i have to drill wholes in my h pipe and put sensors in the pipes?
or would i have to drill wholes in my h pipe and put sensors in the pipes?
Post Fiend
Joined: Jan 1997
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From: Enjoying the real world.
4.6 2v chip question
They'll work but there's still no way for the engine to change the air/fuel ratio as needed for changing conditions. All those will do is eliminate check engine light problems. If you go that route you'll need to do a dyno run along with a/f ratio map (pipe snifer) so we can get the ratio right. Otherwise while it may run alright it almost certainly would not pass emissions and not run as well as it could.
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