I have a 2001 pontiac grand am gt.The bolt that holds the tensioner pulley in the engine block keeps coming out and my belt slips off! Is it possible that it has the wrong size bolt or something else?

If you're talking about the pulley, and not the tensioner mount itself, just replace the entire tensioner assembly. It's about $50, and not all that difficult to do in a driveway. If it's the entire assembly that coming loose from the engine, that's another story. If the bolt is the right bolt (make sure!) then chances are the threads are stripped. It's not a difficult repair but it is time-consuming and tedious. You'll need to jack the engine a bit (disconnect motor mount), and remove the old tensioner. Drill out tapped hole and install a Helicoil to restore the threads.

does bolt have stripped threads? broken bolt? get a new bolt after measuring it and depth of hole minus1/16 and install usually 3/8 or 7/16x1to1 1/8long

The tensioner pulley had been replaced along with a new longer bolt which broke clean in half inside the cylinder head.We have already replaced the pulleys and put on a new belt as well.Now the bolt is stuck in there and we've tried to use a left hand drill to get it out but it didnt work.So we've almost drilled the entire bolt to shreds trying to get it out.Nothings working.

Go ahead and drill it out completely. You'll need a helicoil insert to restore the threads, it's not that difficult. Use locktight on the helicoil before threading it into place, and let it set up overnight.

How do u get to it tho

what fuses are needed in the engine compartment fuse block some are missing 2001 pontiac grandam gt