Replaced Plenum, Coolant out of engine, New Starter,STILL wont turn over! Air sound!

[jedman]

I replaced a starter, upper intake manifold, and pulled plugs to eject coolant on my 2004 Buick leSabre, which unceremoniously died on me the other day due to the mix of coolant and oil in the upper intake manifold. Flywheel spins fine, starter is brand new and replaced, no leaks at gasket after installation of plenum was done to spec. Once I place the spark plugs back in, the car acts like it wants to turn over, but makes this odd "farting" sound, like air is trapped, and it comes out of the exhaust and throttle body. Do I need to buy new plugs? Everything is connected exactly how it came off and fuel is getting to the engine.....

 

[jedman]

I replaced a starter, upper intake manifold, and pulled plugs to eject coolant on my 2004 Buick leSabre, which unceremoniously died on me the other day due to the mix of coolant and oil in the upper intake manifold. Flywheel spins fine, starter is brand new and replaced, no leaks at gasket after installation of plenum was done to spec. Once I place the spark plugs back in, the car acts like it wants to turn over, but makes this odd "farting" sound, like air is trapped, and it comes out of the exhaust and throttle body. Do I need to buy new plugs? Everything is connected exactly how it came off and fuel is getting to the engine.....

If anyone else has this issue, YES, IT IS NECESSARY TO REPLACE THE SPARK PLUGS, as they get damaged from the oil/coolant mix. Fire the car up and allow the white smoke to blow out of the exhaust and let it idle for 10-15 minutes. Double check that the plenum is not leaking any further, and your car will ride like a dream...

 

[HotZ28]

Welcome to the forums! I assume you mean the engine is turning over freely with the starter, but will not start? If so, and the old plugs were coolant soaked, they are probably not firing. You could try cleaning them with carb cleaner to see if you can bring them back to life, if not replace them. When trying to start an engine without the plugs firing, you are injecting fuel into the cylinders, unless you hold the throttle wide open, which will disable the injectors. That unburned fuel has to go somewhere, hence the "farting" sound.