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The website has software that looks for obscene words. I would think a compression test would show if the cylinder is having mechanical problems. And yes the intake or head gasket could be leaking again, especially if the intake or head were warped or cracked. Have you checked fuel pressure ? Does the spark plug for cylinder 5 show signs of coolant leaking into the cylinder ?
did you check the lower intake manifold gaskets? they go bad on the 3800 series 2, since you have the supercharger you won't have an issue with the upper intake because it is not plastic but the gaskets may be bad as well. that engine runs best with irridium plugs.
The upper intake plenum is leaking coolant into the cylinder heads. The head gaskets on this motor are awesome. So, chances are it's the upper intake plenum. You can check this, by removing the vacuum hose that runs between the upper plenum and the brake booster. Stick your finger in and try to touch the top of the lower intake manifold. If your finger is wet it the upper plenum. You might as well replace the lower intake gasket while you're performing this work because they are prone to failure also. Use a shop vac to pull any coolant out of the cylinder heads. Get brand new spark plugs because the old ones are probably fouled. Once you get the plenum and gaskets replaced, remove your fuel pump relay and leave the spark plugs out and turn the engine over repeatedly for about 10 seconds to push any excess coolant out of the cylinder heads. Then, put the spark plugs in and turn the engine over for 10 seconds again. This will burn excess fuel as coolant out. Then, replace the fuel pump relay to allow fuel to be pumped into the heads. Car will smoke for a few when it fires up, but will clear out quickly. CHANGE THE OIL! Twice within a week if possible.
How old are the spark plugs and wires. GM vehicles are great runners until something goes wrong with the typical spark or fuel delivery issues. Wires or fouled plugs may not set off the computer, it will just run crappy.
another issue that causes flooding in the Vortec 350 ( which, I assume you have) is the fuel injection spider. The spider assembly also contains a fuel pressure regulator if faulty can allow too much fuel to pass through the injectors fouling the plugs (a common problem), While your in the upper intake you might as well take care of your lower. A leaky inner seal on the lower intake can cause out to ceep in to your heads causing a faulty spark.
Sound like you forgot to put new O-rings on fuel injectors.you have a intake leak through the injectors ports. that why car wont crank .remove fuel rail.replace upper and lower O-rings on fuel injectors.
these cars have issues with coolent getting into the intake... headgaskets are not one of the issues . check plugs for coolent. upper plastic intake has coolent flow in to chambers if u will, and over time they get micro cracks and brittle ...lower intake manifold gaskets are plastic also. ..cyl. heads are cast iron not alluminum . lower intake manifold is alluminum and upper intake is plastic .. on my lesabre a plastic 90 degree elbow connected to the lower intake manifold to the heater hose housing. the belt tensioner is connected to this housing im refering to. not saying for sure, but if it is this is usually why...
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