94 Lumina Z34, Trying To Sell But Irratic Idle!!! Help Please!!

[BILLYBOBERENO]

IM trying to sell my 94 lumina Z34 but sometimes i start it up and the idle goes up really high and very slowly comes back down. It idles at 1500 rpms. Sometimes im driving and the it starts putting and dieing out!! what should i do? also lately the brakes have gotten really hard to push down and their is a squeling sound when i pull up to a stop with the windows down, i can hear squealing? (and its not my tires!!)

[92 Lumina]

High idle sounds like a vacuum leak. Most likely the intake lower plenum to the heads ( sealant an gasket breaks down from heat )( just did mine)
Check the vaccum line from intake to brake booster(mine was spongy and would not let vacuum through )most likely behind intake under EGR valve
If your handy the intake should take about 8hrs in your garage. By the way most aftermarket manuals do not list the proper method for the reinstallation of the intake.
Also be careful when disassembling and reassemble the intake - it is very easy to brake off the return hose to the power steering pump (its in the way)
It costs $79 - $99 if you brake it off.
and check that vacuum line while you have the intake off!

If your careful you can do the job for about $40 or less and 8 hrs (+ $11.00 for the vacuum line)
I may get corrected on this but I was quoted 3.5 hrs at the local shop + parts


Good Luck

Mark

[92 Lumina]

Before I get to carried away ( too late)
Easy way to check for a vacuum leak is to spray carb cleaner at the suspected area. If the idle dies down you fund your leak.

Hope this helps

Mark

[mikeyk22]

as suggested, chech the brake booster vacuum hose. this is a common problem. it is a pain to get at unless you have really tiny girl hands, so good luck.