If you just cleaned the EGR and replaced it, you can turn off the Check Engine Light (CEL) by disconnecting the negative battery cable for a couple of minutes. The engine may run rough for a few miles until it "re-learns". If the CEL comes back on, take the vehicle to AutoZone for a free scan. If the code still indicates a faulty EGR, it may have to be replaced.
No, a person cannot just clean a check engine light to pass inspection. The issue causing the check engine light must be dealt with and fixed.
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Try removing the valve and blowing air through both passages. If one feels restricted as though from carbon buildup you should clean it out.
Gasoline will not dissolve the carbon deposits that clog the injectors but it will cause your engine to not start.
Shampoo the engine to clean it. Check for leaks in a day or so depending on how bad the leak is. Replace the component causing the leak. If you still can't find the leak you can put dye in the engine oil and look for the leak with a black light.
The governor is stuck, causing the engine to over-speed and not return to regular idle speed. You can check the travel of the governor by moving it back and forth with your finger - there is not much travel, but there should be some. Check for debris or accumulated gunk at the lever where it joins the engine and clean it well. Ensure that the engine oil is clean and at normal level. A stuck governor will make the engine over-speed so fast that it can cause the piston rod to break. Good luck.
Check the idle air control valve (IAC valve). If dirty clean or replace. Also check air/smog pump. Be sure intake fins on that are clean. Even if clean, could be causing the noise.
Your car is dieseling. Air is still entering the engine even though you shut it off. Check the Idle Air Control. There might be some sort of deposits which is not allowing the Idle Air Control to fully close. Remove and check to see if it's clean. If not, you'll have to clean it of the carbon deposits.
Your car is dieseling. Air is still entering the engine even though you shut it off. Check the Idle Air Control. There might be some sort of deposits which is not allowing the Idle Air Control to fully close. Remove and check to see if it's clean. If not, you'll have to clean it of the carbon deposits.
Check the governor where it contacts into the engine for freeness. Clean all the sludge around the area and spray a little WD40. Also inspect the linkage for sludge or bends that might be causing the governor to stick open.
Check the drivers side relay inside engine compartment (1rst. close to battery attached to fender), also check pickup module inside the ignition case, check: ignition rotor, ignition cap must be clean of residues, check carbon contact to rotor. The relay mentioned also controls fuel.
Check coolant leaks with a visual inspection. Clean the engine, then see where the coolant reappears. Look under the water pump. Check engine oil to see if coolant is leaking into the oil.