Pulled plenum...lots a ??'s

[guinnessdood]

Originally Posted by 32valvZ

I pulled the plenum in hopes of finding something that pointed to my off idle miss or vibration problem. I dont see anything obvious.....I wish I did. Where is the hole I need to drill? Is the breather box the thing with 2 big hoses on it? Injectors are black with pt #'s on the tops.

Well...injectors could still be an issue. There are ways to test them with a meter...but they won't always catch a bad injector(s) but it could. It's basically a resistance test of the coil in the injector itself. Using an OHM meter you should be able to verify the resistance of each injector itself by connecting directly to each one. You should get a resistance of ~12-13 OHMS (not K OHMS) on each injector. if you get a lot higher (open condition) or lower (8 OHMS or so less) then that injector should be replaced. Keep in mind that even though an injector tests fine electrically...it can still fail mechanically, i.e. injector leaks or binds causing leaking.

The Drain Hole. - Look over here. http://www.bcvettes.org/ look at the How To Section. It is the one for the starter motor...has great pics so you don't have to be nervous about where to drill the hole. BTW...the coil packs will have to be removed as well..and that's also in their HOW TO section.

Breather Box - yup the one with the two big hoses. typically the bolts are loose and oil is leaking from the box where the upper half bolts to the lower half.

Injectors - Black with steel bottoms - most likely they are Multec (original equipment). replacing injectors is ALWAYS a good idea if you have the early style Multec injectors. The new fuels (with lots of ethanol) are hell on these injectors...and it significantly shortens their life. I would recommend replacing them if you can afford it. Accels (P.N. 150121) are about the cheapest way to go for ~$550 a set of 16 and the RCs are about twice that price.

One more thing...do you have a Factory Service Manual? If not...get one here. http://tinyurl.com/ysrbpn