In this post, we are still trying to identify the problem with our Suburban misfiring. I referred to the repair manual on our truck and it mentioned a few other possibilities to look at for the issues! With a misfire code coming up on my scanner and I decided to look at other parts related to the fuel system and exhaust that may also be causing a misfire code so I decided to back to my E.G.R. valve and test the pindle on it. When you want to test the pindle, you do it with a pencil eraser and you gently move it up towards the top of the valve. If there is a movement that part is operating correctly. Ours is not working correctly at all. Not to mention all the carbon build-up on it.
When replacing the E.G.R. valve, it’s pretty straightforward. Remove the electrical plug from the top of the valve, and remove two bolts holding the valve in place. These bolts are 12mm and once they’re removed, you can lift the valve off, and don’t forget to remove the old gasket with it. Now with the mounting base, your valve mounts to, stuff some clean rags or shop towels in the holes before you take a wire brush and clean the base off as good as you can. Then you can install your new one.
Another thing I decided to replace is an M.A.F. sensor. My purpose for replacing this sensor is to optimize airflow and horsepower in hopes of optimizing fuel mileage which this truck could benefit from. When replacing this sensor it’s pretty easy to do also. It connects with the air filter box and throttle body tubing. You just have to remove a couple of hose clamps and remove one electrical connector that is plugged into it. Gently remove the hoses. Bring in the new one and install it the same way as your old one, but remember where the sensor box and plug connection are located so it’s in the proper stock location for your electrical connection before hooking up your hoses, be sure your clamps are on first.
Then hopefully it’s time for a victory cruise. Unfortunately, it isn’t in the cards today. It’s time to hit the books again and figure out what else it could be!!!