Question about Cars & Trucks
The ecm is the engine computer, or the main computer if the car has more than one computer equipped on it.
The oxygen sensor is one of at least a dozen sensors the ecm gets information from, so it can run the engine at optimum performance. The oxygen sensor is placed in the exhaust stream, and most cars of these days have more than one, some as many as four.
The egr valve is an emission control valve, pretty simple-it's been around for a long time, it works to keep air pollution down. Problem is, now days the valve operation has some electronic controls that defy an untrained person how to make it work. You will find when you take it off, if it has the common problem of being clogged up with carbon deposits-both the bottom of the egr valve and the passages beneath-it is exhaust gas carbon deposits, can be cleaned and hopefully made to work right again.
Just a guess as to cost, the engine module will be the biggest expense, $400 bucks, lowball, and no gaurantee it will solve everything.
Posted on Jan 20, 2013
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Posted on Jan 02, 2017
SOURCE: EGR Valve, O2 Sensor
Absolutely a bad o2 sensor can cause problems with performance. If you replace one it is highly recommended to replace both or all four depending on your vehicle. If one o2 sensor is making your vehicle run rich you will burn more fuel and in return increase the amount of carbon or unburnt fuel if you will in your egr valve you could probably get away with cleaning it but I would recommend replacing it, it will save you from having to pull it off again. Check your catyletic converter because long exposure to carbon will mess it up.
Posted on Jun 06, 2009
Does it misfire under load like when you press on the gas peddle after slowing down then accelerate or at idle. When you say spark plug did you mean all the spark plugs?
Posted on Nov 24, 2008
The EGR will not cause this issue, this sounds like the Catalytic Converter was not hot enough, another trick that worked for this kind of fail was a fresh oil change, make sure the engine is up to normal operating temp, which would be just short of 1/2 scale on the temp guage, if it runs cold replace the thermostat, I did smog tests for 30 years and these are the things I did to get cars like yours to pass given the test results you gave for the tailpipe.
Posted on Dec 05, 2008
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