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I am having trouble getting my check engine light on my 2001 mitsubushi Montero sport I have put on egr sneiod and a egr valve and still it want got out
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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.
Use a vacuum pump to operate the EGR, at idle. If it stalls out then the egr valve is fine. If there is a vacuum leak then you found a problem in the EGR Valve diaphragm in that it is leaking air (not hold vacuum).
If there is an electrical problem with the EGR Valve Solenoid, then it will be picked up by the computer.
make sure egr passage way from valve to intake not clogged and make sure exhaust to egr supply is present and make sure if valve is vacuum operated that senser is ok and vacuum supply correct if electial egr senser then intake probably clogged sense code 401 is insuffence egr flow
Most likely you have a misfire, I'd be surprised if it didnt turn on the check engine light. It may be a coil or sparkplg problem.
Do this this. With your foot on the brake hard and the ebrake on put the car in gear and rev the car up a bit. What your doing is putting a load on the engine to see if it shutters. If it does it points to a coil issue usually or it just may be time plugs and wires
its an egr CIRCUIT MALFUNCTION which means can be any type of problem with the whole circuit -- wiring --connections fuses relays etc not just the egr valve more than likely the valve was good need to check and test the whole egr system
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