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saturn had a lot of problems with the coil posts getting rusty that will cause the misfire on cylinder number 3 and any skip will cause the random misfire see as one coil fire two cylinders the egr sensor is built into the vavle and try stick closed from carbon build up cleaning it will only putoff replacing it if it operates at all
the egr valve can be changed from below but the left bolt must be done blindly by feel, (use a small mirror,) undue the 2 bolts and pull it out from the intake, careful to make sure the gasket on the end of the tube comes with it; the 2 bolts that hold the egr on also has a metal gasket; the hardest thing is to disconnect the electrical plug from below that connects the egr valve, - do not do this if you have no mech experience;
Your new EGR valve (assuming it wasn't defective out of the box), is fine, but the car's computer just needs to have its code 403 cleared. Even though you've corrected the problem, the computer will still light the "Check Engine" light, and store code 403 until the code is cleared using an OBD-II (On-Board Diagnostics 2) code scanner. Note that the car will function perfectly with its new EGR valve, a lit "Check Engine" light and a code 403 stored. Its just a good idea to clear the code, so that then only NEW problems will become the reason that the "Check Engine" light gets lit.
it is located at the rear of the engine behind the intake, the most common symptom on this is just a rough idle or in most cases a check engine light that stays on, no matter what is wrong with the valve it will set a fault code and turn the check engine light on, so unless the light is on the problem is not the EGR
Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.
Hello Malcolm. The vacuum line to the EGR will certainly cause your check engine light to come on. The vacuum hoses on these cars become brittle with age, I generally replace broken lines with a quality rubber hose available at your local auto supply. The check engine light may take a while to turn off without clearing service codes. If the light is still on after a couple days of driving you may have other issues turning on the check engine light. Hope your repair goes well for you.
real easy. remove the top of the airfilter, then pull the bottome piece out. the egr vavle is on the engine with that tube going into it. there are 4 small bolts, 2 8mm for the tube, and 2 10mm to the head. should take about 10- 15 mins to replace. make sure the engine is cool.