How do you replace the egr valve on a 1987 Mazda truck?

Answer 1

I suggest removing the air cleaner assembly.It has the 3 bolts and remove the plastic duct tube on it, the two nuts inside at the carb and flex hose on the exhuast manifold.Now pull it up disconnect the two vacumm lines on the bottom of the air cleaner NOTE where they go with some masking tape(good idea) and prop the air cleaner up with a long flat head screw driver.Now the egr is below the carb it has 3 10mm bolts one vacumm line,one electrical connector.I would NOT just replace it at first.I would remove it and NOTE the position of the metal gasket on it,and then clean it with carburetor cleaner and a tooth brush,or sandpaper,or small cordless drill brush.Get all the carbon(black soot) out and reinstall.If after the this the problem does not improve try disconnecting JUST the vacumm line on the egr and if the problem goes away THEN replace the egr.This would indicate the diaphragm inside is losing vacumm causing bad idle,coughing,hesitation,choking etc.Auto zone and advance auto both sell this and it is not cheap look at rough cost 140.00 -160.00 unless you can find a NEW one cheaper.Try cleaning it FIRST then reaccess the trucks running condition.I know this first hand after owning my 87 for 23 yrs since new!!ALot to read but,solid and exact.