This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. But the light doesn't stay on. You'll also need reliable eye protection and chemical-resistant gloves. Question: After I cleaned everything and vacuumed the intake out, it runs really bad. Newer models use a similar valve with a small box (sensor) on top along with an electrical harness. P0401 is a general code, which means that regardless of the year (1996+ anyway) and the model, it’ll have the same meaning regardless of which manufacturer built the vehicle (Chevy Colorado or not). Here’s a good article on how to do that from, Test the EGR Valve- A vacuum gauge will help you determine if the EGR valve itself has gone bad. Answer: Yes, a type of alkaline is the main basic component. Cleaning your EGR valve will solve your car's engine performance issues related to any clogging or system passages problem with the valve. Turn the ignition key to the "On" position. For a better experience, please enable JavaScript in your browser before proceeding. Unplug any electrical connectors from the valve. Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. Carb cleaner smells horrible and is nasty stuff, so soak it outside or in a very well-ventilated area. This engine has already seen 400,000kms in service vehicles for Cat And CUMMINS etc without cutting out emission devices despite your idea being illegal and even after they have travelled that distance the entire vehicle is not worth much so I wont be following your lead macman. Electronic EGR valves are used in vehicles dated 1990 and up. My mechanic detached only the EGR without the tube connected to it saying it's broken and had to replace it without checking it. P0401 is a general code, which means that regardless of the year (1996+ anyway) and the model, it’ll have the same meaning regardless of which manufacturer built the vehicle (Chevy Colorado or not). Allow the EGR valve ample time to cool down. Check the oil dipstick, under the oil filler cap, or PCV valve for a milky residues. Check DPFE Sensor Voltage- If you are good with a voltage meter go ahead and test it. 0L Turbo Diesel 4JJ1 & Isuzu Dmax including gasket. While you can't test your EGR valve function from home, you can clean it there, a simple task that effectively acts as a repair. On newer car models with electronic valves, the vehicle's computer will trigger the Check Engine light or MIL (malfunction indicator light) when EGR system problems develop. If your EGR valve has an electrical connection, carefully disconnect it and lay the wiring aside safely. Replace the EGR valve and remove carbon deposits to ensure proper operation of the emission control system and eliminate engine driveability issues. Turn the multimeter on and set the dial to "Volts DC." Let it soak overnight if you can. Clean the EGR valve and passages over the weekend at home using a few common tools and a quality EGR valve cleaner. 1994 Ford F150. Check near the throttle body, firewall, or intake manifold. If it still looks in good shape, recycle it. To deal with rock-hard buildup, leave the valve soaking in the cleaning solution for a few minutes. Soak the EGR Valve . Check it and see in what condition it is. He has certifications in automation and control technology. Still other models use a cylinder or block configuration for the valve with attached sensors and an electrical harness. I’m going to clean it, as I just saw how dirty it was in there. Our team is available to answer all your questions. If the volts measure above 0.9 then the system should be serviced. Answer: See if spraying some carburetor cleaner around the gasket area changes the idle speed; otherwise, you need to remove it and do a visual inspection. Unplug the vacuum hose from the top and just follow the rest of the steps to clean the ports. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. After locating the valve and moving accessories out of the way to gain access to it, it's time to remove it. Cleaning the EGR valve assembly is a two-step process. block it off and get a flash tune to stop the codes. This driving pattern doesn't allow the engine to reach operating temperature and run long enough to remove harmful carbon deposits.A cleaning EGR valve job doesn't have to wait until engine performance issues appear or the Check Engine light comes on. Recognize bad fuel filter symptoms, improve engine performance, and avoid expensive repair bills. Don't forget to reattach your vacuum hose and your electrical connections, if applicable. Question: If you clean the tube connected to the EGR will it help? Electronic EGR valves are used in vehicles dated 1990 and up. It depends on how far you want to go and how much time you have. Try cleaning the EGR and, if necessary, intake manifold, first. That’s because the EGR valve is not always going to be the culprit. Look around the passenger side, close to the firewall. You can damage the diaphragm if you use special cleaning chemical like carburetor or throttle body cleaner. Answer: Black smoke expelled from a vehicle is associated with rich fuel mixture - during a cold start, this could be a leaking injector. Overtime, though, this routed gases build up a hard and thick wall of carbon, locking the EGR valve opened or closed and obstructing system passages, which prevents exhaust gases from reaching the combustion chambers and increases NOx emissions. The answer key is below.

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