정기점검 수리 사례

2026. 7. 1. 작업

난이도 & 준비물

증상

2005 Malibu (Classic, fleet version) with 2.2 L Ecotec four-cylinder engine fails to start. It turns over, and scattered weak pops indicate that there’s rudimentary combustion going on, but it does not catch. I’ve pulled the plugs, there was spark, but very weak. Plugs were in very bad condition — fouled up, with electrode eaten away — seems like no one bothered to change them in 120 000 miles. I’ve replaced the plugs, but I’ve found that spark still remained strangely weak, not the bright blue one I would expect. Anyhow, that did not help. Also, there are no plug wires, as there is resistor p

처리 내용

When trouble shooting a cranks but won't run condition it comes down to three things Fuel, Fire, or Mechanical Fuel - Spray either or starting fluid into the air intake while trying to crank the vehicle. You may have fuel pressure but not enough, this will rule out a fuel problem. If it runs you have a fuel problem if it doesn't you don't. Fire - Check to see if you have spark. In your case you do, if it will jump the spark plug gap it's generally enough to run the engine. You can use a spark tester that tests for adequate spark. Mechanical - The engine has a mechanical problem that prevents the engine from running. For example a blown head gasket, broken timing belt or chain, or it's jumped time. In your case I suspect a mechanical problem. Check the compression, also if you have a lab scope check the waveform on the crank sensor, if not you could try a crank sensor. It takes about an hour and requires removal of the starter to gain access.