Hi everyone i was researching some about my Cadillac Seville i have and came across your site and thought some of you on here with more knowledge on the engine than me could help me out. I have been a proud owner of a 1983 Cadillac Seville for a couple months now, but i have ran into a problem which i believe to be a vacuum leak.
I have the standard gas engine ht-4100 4.1L engine. Sometimes whenever i start the car up, it will run smooth, but then it will start to run rough. It will act like the engine is reving up, then act like the engine is about to stall or die, then rev back up, the act like it's dieing, you get the picture. Then whenever i try to drive up a hill, i will start to climb the hill at 45 mph, then it will drop down to 25 mph before i reach the top with the petal to the floor. Also sometimes on normal flat roads, i'm lucky to get it up past 45 mph sometimes not even that, more like 40 mph.
there has also been a few times where i park the car, then get out for maybe an hour or so, get pack in, the engine starts, rev up, rev down, like before, then die. Then i have to pump the petal some and hope it starts back up for me. I have also had it where i reverse out of a parking space then the engine die in the middle of the lane. I'm assuming it is a vacuum leak somewhere. Most of the hoses don't seem to be in terrible condition but you can tell there is some age on it.
I opened the hood of the car, trying to find a hose that was rotted, i took the cover of the air breather, and got down the the trotter body. One of the hoses toward the back (looking from the front of the car, had a split in the end. The hose goes from the left silver cover on the engine to the air breather. Could this be my vacuum leak? and how in the heck do you get it off, i tried but couldn't get it to budge :/ Also when idle, if i put the petal to the floor, the engine almost dies instead of the rpm going up.
Then as i took the metal cylinder shape tube off the throttle body, i found dry rotted remains of a gasket which is completely done for. Could this play a part in the leak, and if so what is the name for it? Any help is much appreciated.
P.S. on a side note... i have a belt that is whining pretty bad. I've noticed that the heater goes cold when it whines and doesn't blow as hard... any idea which belt it is? ;/