Im still having the vacuum loss under boost and what not for the HVAC. I took the checkvalve off and blew in it and it did exactly what its suppose to, suck but not blow, so boost doesnt get in, and i took off the line to the Vacuum cansiter,and it hissed and held pressure just fine when i sucked or blew into it, no loss or anything, same with the cruse and HVAC i suck and its tight, not leaking, BUT the one that goes from the check valve to somewhere behind the plenum, i can blow/suck freely as if theres a leak, is it suppose to be that way?
And no Blow/Suck jokes please :lol:
I hate that one ,it always breaks
Make your own boost leak tester to locate it. We just took a PVC plastic cap, use an air fitting on it, and used the stock tube that went to the air filter. It works great
i dont have a boost leak, just the HVAC goes to the floor when under boost, is the one from the checkvalve to the back of the plenum suppose to be sealed so i cant blow in it or what?
There should be no vacuum source on the back of the plenum, it should be plugged, that is where the vacuum brakes tap into. If its under boost, its a boost leak :P
Do this, just unplug every vacuum line except the FPR and MAP sensor, they are the only 2 absolutely necessary ones, start eliminating possibilities to locate the problem
ok, so if its not a vacuum source, it should be "plugged" and not able to be sucked or blown into?
Quote from: Prospeederok, so if its not a vacuum source, it should be "plugged" and not able to be sucked or blown into?
Umm, if we are on the right page and talking about the right thing here, then no, it shouldn't, because well, its a big hole in the back of the plenum that has a screwed in metal plug.
Edit, that is if it is un messed with of course. Mine has a T valve for the BOV and Boost Gauge in it
:lol: :lol: :lol: :lol: quit messin with speeder, he dont have nothin there yet! :lol: :lol: yes it should be pluged if its not in use. if there is an open hole anywhere nothing works right and the hvac will not work right. and the cruise wont work right. you can usually tell where the vac leak is just by driving and seeing what works. If you work on them enough that is and you see where the leaks pop up. You can actually get pretty skilled at it, the more it happens.
Ic ic, my crusie and hvac work fine untill you get under some boost, so it should be plugged, ill have to check that out i guess, I HAD a picture bossman made but its off his server now, little ghetto drawing but it helped imensly
Ok, let me get this straight..
The line that you can blow in to with no resistance is the one attached TO the check valve for the Cruise and Hvac system?
If so, that connects to a hose behind the plenum, which then runs under the plenum and around the front to the Throttlebody. It's NOT the line that goes to the Fuel pressure regulator and MAP sensor, it's the other one. There's a connection behind the plenum in which that line connects to. Grab a flashlight, and dig around behind it, you should be able to find it, and when you do, make sure it has a tight fit. Any loose fitting vacuum lines on a boosted car can be a problem since the boost can push them apart.
No, it Doesnt from the TB, it its the 3rd line on the Check valve, ill take a pic, it goes from the Checkvalve for the hvac and cruise and off behind the plenum
IN green, i have a screwed up vacuum system dont i?
(http://img.photobucket.com/albums/v210/Prospeeder/TB.jpg)
Quote from: ProspeederNo, it Doesnt from the TB, it its the 3rd line on the Check valve, ill take a pic, it goes from the Checkvalve for the hvac and cruise and off behind the plenum
IN green, i have a screwed up vacuum system dont i?
[/img]http://img.photobucket.com/albums/v210/Prospeeder/TB.jpg[/img]
Going off your picture, yeah I would say so, why do you have 2 vacuum sources going to the same thing? :? Especially considering a check valve probably probably won't work very well when the bleed side of the check valve is also being pressurized.
and 3rd of TB line, does that mean from the front to back or back to front?
Front to back should be what FPR and MAP, HVAC, Purge, and EGR
Quote from: z284pwr
Front to back should be what FPR and MAP, HVAC, Purge, and EGR
Yea, that's correct.
Judging by the picture, the green line you have problems with shouldn't even be there. The Cruise and canister come off one port on the check valve, and the Hvac comes off the other port.
I'll have to look at ours when I leave for lunch.
Quote from: LukeZ34Quote from: z284pwr
Front to back should be what FPR and MAP, HVAC, Purge, and EGR
Yea, that's correct.
Judging by the picture, the green line you have problems with shouldn't even be there. The Cruise and canister come off one port on the check valve, and the Hvac comes off the other port.
I'll have to look at ours when I leave for lunch.
Yeah that is correct, the Purge is the big fat vacuum line. The Cruise is in with the HVAC one. You definitely shouldn't have that green one plugged into the back of the plenum
yea he should, that line is supposed to go on the back of the plenum underneath where the plug most of us take out to put our BOVs on. It leads to the check valve under the cruise unit. I think the cruise plugs in on the next tee down the line.
Here, a quick search on the forum turned up this image. This is how the car's vacuum lines SHOULD be. So if it's not, then fix it so that it is.
(http://www.geocities.com/ryan_rester/pics/vacdiagram.jpg)
The map sensor..isnt that on the back of the motor??? I think thats where the Line from the check valve goes..or mabye to that plug for a brake booster or what ever, i dont know, i will make sure tomarrow
Yea, the MAP sensor is on the rear left side of the plenum, closest to the Alternator.
There should be nothing in the brake booster port on the rear of the plenum. It should be plugged with a large hex screw as it was from the factory.
Just print that diagram out, and start tracing the lines. That's the best way of finding out how everything is connected, and if it's connected properly.
Quote from: ProspeederThe map sensor..isnt that on the back of the motor??? I think thats where the Line from the check valve goes..or mabye to that plug for a brake booster or what ever, i dont know, i will make sure tomarrow
Umm, what brake booster? Where? Your PMIII isn't vacuum assisted, it doesn't need vacuum. I would do what Luke suggested, for some reason, I'm thinking your vacuum lines are all screwed up.
On a side note - One cool thing about non vacuum assisted brakes, you could run a HUGE cam and not worry about your brakes at low speeds, idle motor wouldn't like it very much though :lol:
Quote from: z284pwrQuote from: ProspeederThe map sensor..isnt that on the back of the motor??? I think thats where the Line from the check valve goes..or mabye to that plug for a brake booster or what ever, i dont know, i will make sure tomarrow
Umm, what brake booster? Where? Your PMIII isn't vacuum assisted, it doesn't need vacuum. I would do what Luke suggested, for some reason, I'm thinking your vacuum lines are all screwed up.
On a side note - One cool thing about non vacuum assisted brakes, you could run a HUGE cam and not worry about your brakes at low speeds, idle motor wouldn't like it very much though :lol:
I know quite a bit about the PM3, Power assisted with no vaccum, uses a pump with a nitrogen charged accumulator to pressurize the brake fluid at around 2700 PSI as a booster. I was wondering mabye the people put the line on the plug mabye :?
alrighty fixed it, turns out that line had no vacuum, nothing, was dead basicly, so i undid it and plugged it just in case and put them all in the correct places and everythings workin good. Thanks all!