20VT90q

Hey, I have been experiencing a bouncy idle and poor accel for quite a while now. Did wires, plugs, idle valve and techron. When i drive the car doesn't want to repond to more pedal sometimes. After I get to a certain point it will just get power all of a sudden and surge forward. This told me it was probably a vacuum issue. I already replaced the rightside valvecover tube. So I decided to check the vacuum lines that connect to the intake manifold (this is on my 93 100 cs). I didn't have a lttle homemade tool to check the lines so i just unconected the line where it connects to the manifold and blew into it. I heard a hissing noise right after doing this. I found that the green cap that connects to one of the tubes was cracked. This crack is causing a vacuum leak. Anyway I decided to check the vacuum lines for the cruise control by blowing into a line that connects to the black plunger that holds the throttle. I can hear a hissing noise from that too. That hissing is coming from under the coolant resevoir area. Guess I'll have to re-pipe that line. What I need to know is the part number for that green cap that is cracked. (It is on the vacuum lines by the right side of the engine, ontop of the valve covers.) Also would this cause a slightly unstable or rough idle even though it has to do with the brake master cylinder? If there is a leak in the cruise system or any other system could that cause performance or idle issues?

Mr. fix-it

If you are hearing a leak coming from under the coolant resevoir area it might be a crack in the vacuum resevoir. If you are loosing vacuum then yes it can cause numerous performance problems.

MikTip

The rubber ones are easy to find at local autoparts places, like AutoZone, or NAPA.

20VT90q

Thanks for the reply Mr. Fix-it and Mik! When i found the leak in the cruise control it was coming from under the coolant tank not the aux vacuum pump for the cruise control. At least I think it was. That's still a possibility though. I will search the Russian parts site more to see what I can find for the green cap. If I can't find it I will go to the Autozone. I need to replace the vacuum lines on that side of the engine anyway. What area would this cap be under Mik?

thanks