Vacuum Test

Ok this is a dumb question, but I have done a compression test on my 89 Chevy C1500 and they were all around 100/150 which was perfect. Now I want to do a vacuum test on it, but every time I tried I couldn't get it to work. Anybody have directions or a website that could show me?

I want to do the test because it bogs (I don't know what to call it, but it seems to totally die, as in sounds like it shuts off, if I gun it, like it skips a power stroke or something) more than a fat lady running to the pisser from a stop, and from slow or idle if I give it more than 1/2 gas. It will ocassionaly (as in most of the time) not seem to rev up right when I try to go from a stop sign. I start going and it seems like the revs sit at a certain spot for like 3 seconds then I have to floor it and 2 seconds after that it will either downshift and go, or it will just shoot the revs up high on the current gear. I replaced my cap and rotor, and put in new plugs and my uncle and I totally took it apart and put in new gaskets and cleaned it up like 8 months ago when I baught it. Any help PLZZZZ!?

http://www.users.bigpond.com/ergoff/vac2.htm

Call me your savior, and do fill me in on anything you find, i have the same exact problem with my blazer. almost when going slow and you let off the gas it almost dies.

Do you think you may have a Vacuum leak causing your (BOG).

EG : Intake / TBI or Vac lines in general?

Mr.Rob

Lic Mech Auto/Truck/Trailer Ect...

I guess so. Thats really the only thing I can think of that would be the problem. My timing is off a little, but not bad enough to cause a stroke miss or kink out or whatever. I did the compression test and it came out almost perfect. Re-gaped the plugs and got a new cap and rotor with old new wires. (Never used or opend the box before) I replaced the PCV valve...A vacuum test is really all I have left to check it with. Oh, and sorry to be a nitpicky weiner, but I have a chart that shows what the readings from the vacuum gauge means, and diagrams and all like from that site, it's just the test in general I can't figure out how to do! :loser: I feel retarded asking because I should know how but I just can't get it to work. I put it into one of the throttle body Constant pressure thingys, but I think it's either the IAC or some of the valve cover hosing I made causing the problem. I can't really get the IAC port to not leak, even when I take it out and jam towels or/and my fingers in it while I test. I will talke a picture of my engine with the air cleaner off and stuff to show you the hosing I had to do when I ordered cheap, cheezy valve covers that weren't even symetrical when my dad comes back with the camera monday.

BTW, I can't find a vacuum tester for FI engines anywhere around where I live. I tried Target, Wal Mart, Fleetfarm, Checker, and Pep Boys...Checker was the only place that had one and it was $66 or something. I heard from my shop teacher that you can get them for $12 at Tools for Less or something but I don't know of one around here. Any suggestions on where to find one so I can just do the test at my house myself? :smile: Thanks for the help and info though, I will be so happy once I fix this problem.

Plug the sucker into the PCV valve hookup at the front of the throttle body.

Alright, i'll try that tomorrow in my shop class. Thanks for the help.

Thanks, and def post results, im anxious to hear what you have going on.