What to do if the Audi EA837 has a cold start delay?
2 Answers
Audi EA837 cold start delay first check whether the throttle and idle valve are too much carbon deposits, too much carbon deposits can easily lead to idle air passage blockage and then lead to poor intake, and then check whether the water temperature sensor of the engine control system is working properly. Audi EA837 engine evaluation: Linear acceleration, thick acceleration sound, strong power reserve, high fuel consumption, expensive maintenance. The most suitable engine oil for Audi EA837: Black Castrol or Total Quartz 0W-30, Castrol Edge 5W-40 is only pure Group 3 base oil, as long as the engine burns oil, 0W-30 and Black Castrol or Total Quartz are fine.
My Audi also uses the EA837 engine, and it often had a delayed cold start by several seconds before, which was quite annoying. Replacing the battery didn't solve the issue. Later, I found out that the fuel injectors were severely carbon-fouled, affecting the fuel supply uniformity during cold starts. After adding a specialized cleaner to the fuel tank and driving a few hundred kilometers, the problem improved. At the same time, I checked the spark plugs, which hadn't been replaced for three years and were causing weak ignition. I bought OEM replacements online and installed them myself, solving the issue at a minimal cost. I recommend starting with simple steps: turn the key to the ON position and wait two seconds to let the fuel pump pressurize before starting. If the delay decreases, focus on checking the fuel system. Also, observe if the high-pressure fuel pump is leaking, as this is a common issue with the EA837. Don't underestimate this—delaying repairs could damage the engine. Regular use of fuel additives and replacing the air filter can help prevent such issues. If the problem persists, have a professional Audi shop diagnose sensors like the crankshaft position sensor for safety and peace of mind.
