Help! Help! Truck engine will not turn!

[pdsilva2]

Hello, I need some help with my 97 Silverado 1/2 Ton 5.7. Last night I was going to change the oil on my truck. I decided to put a some Sea Foam in the vacuum line (through the brake booster) to clean it a bit. So I get home, put the truck on the stands, and I put the Sea Foam in. The truck was off at the time. So I put the Sea Foam in, and then I went inside for about 15 minutes. When I came back outside, I tried to turn on the truck and it did not do anything. It turned over for a couple of seconds and then it stopped. Now it won't do anything. It won't even turn over. I took of the starter, alternator, and the battery and had them checked at Auto Zone and they all work. Did I mess pu the engine? Any ideas? Thanks. Pedro.

[pm26]

Take out all sparkplugs and crank the engine for about 15 seconds. Then reinstall the plugs. You may have created a hydrolock in the cylinders.

[BRZ71]

I agree. Probably Hydrolocked. Do not do anything until you pull the plugs and turn it over for a while.