egr
egr
o2 sensor problem
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o2 sensor problem
does anyone have an answer to this problem? In the 94 f-150 my computer read an o2 sensor problem and i have replaced it with a brand new one. Also, i disconnected the battery to clear the codes. however, after the engine warms up for about 2 mins., the check engine light comes on again, and the computer still stores code as bad sensor. I have check sensor output reading and it reads ok. Also, checked computer side of harness plug and it is fine. have found no air leaks and compression test shows all 6 cyls within limits that are exceptible and fuel injectors are all clicking normally. the thing is burning alot of gas and i can really smell it at idle. could use a little help. So, if anyone might have some advice, " I NEED HELP ON THIS !!!!! " Thanks
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o2 sensor
Originally Posted by rikard
If the sensor is out of range (too rich or lean) it will set a code. Check fuel system pressures and the ignition system.
regards
rikard
regards
rikard
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Joined: May 2007
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From: Solon, Ohio
If an EGR is stuck closed or not opening, you will not suffer any performance problems from it.
It's only purpose is to allow a small amount of exaust gases back into the input manifold during the light to medium power taxing loads on your engine to help cut down on the NOx (Oxides of Nitrogen) causes by high combustion temperatures.
It also won't cause an O2 sensor code, it has a code of it's own.
It's only purpose is to allow a small amount of exaust gases back into the input manifold during the light to medium power taxing loads on your engine to help cut down on the NOx (Oxides of Nitrogen) causes by high combustion temperatures.
It also won't cause an O2 sensor code, it has a code of it's own.
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Well, since someone switched my legs on this topic, I'll chime in here. The vehicle has to be moving or the EGR will not open. I don't know what the minimum speed is, but the expert that corrected me on this should know. This doesn't contradict what I've read about the Ford ECM's, but no mention was made of vehicle motion being involved in the documentation I read.
At idle, EGR closed. At WOT, again, EGR closed. Anytime an enriched mixture is needed (heavy engine load) the EGR will close. Buzzing around in city traffic, the EGR is closed more than it's open. On the highway, though, that's a whole different ball game. The EGR will open to reduce emissions and displace some of the fuel-air mix, which has the added side effect of helping the engine run cooler at higher RPM's with light throttle.
At idle, EGR closed. At WOT, again, EGR closed. Anytime an enriched mixture is needed (heavy engine load) the EGR will close. Buzzing around in city traffic, the EGR is closed more than it's open. On the highway, though, that's a whole different ball game. The EGR will open to reduce emissions and displace some of the fuel-air mix, which has the added side effect of helping the engine run cooler at higher RPM's with light throttle.