You must have the 3.4L engine, famous for head gaskets failing. Most mechanics will want to drop the motor and tranny out the bottom to make the head gasket accessible. If you're patient and you don't mind skinned knuckles, you can finesse the plenum out and get at it from the top, but it's a lot harder. I was lucky and a mechanic friend did it for me (and sent the heads out to be remilled). That was a couple of years ago. I'm still driving my '95, with about 188K miles to date.
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I just put my injectors in on the same car as yours. The fuel rail where the injectors are located has 2 screws on pass side. once you take out injectors then upper manifold, make sure you remove all plugs & connections before removing any screws as there are quite a few plugs for sensors on this engine. I also had to remove the plastic windshield **** that holds the wipers so you can have better access to the screws in rear of upper manifold. Once you do all that other ****, then you have access to intake manifold. i suggest buying a Fel-pro gasket kit at Advance auto parts for under $25, you get all gaskets for the engine, valve covers, manifold, exhaust, etc.. I found the injectors all 6 for $90 on ebay, remanufactured by basically brand new. might as well change those out since the car is 16 years old. I also did lil tune up, spark plugs, wires, coils.
If it's the same as the VATS system in my 86 Corvette (resistor pellet in key) the ignition switch might need to be replaced. The contacts on the key wore low, replacing the key helped for a short time but the new contacts wore the switch down faster then it too needed to be replaced. $200!
you need to order a tech manual / service manual go online to gm's or chevy website i have a Service manual for 95-97 so i may be able to help ya get spec's on it and i may be able to copy send via email
it involves removing many parts if uve never done it my advice is to take it to a good garage because you have to remove carb intake and exaust manifolds distributor and you will have to put it back in time once your gaskets are replaced its not hard but alot to explain
It sounds like the Intake Gasket may have slipped a little During the Install. This would cause the Preassure Problem. Let me know so we can go further if needed. Please Rate my Response, I need all the Help that I can get! Thanks!
Loud popping in the intake means that the unburnt gas exploding in intake.... Check cranks sensor and gear. Gear may dirty or even damage or BAD crank sensor the sensor provides reference for spark signal. So this may be your problem. Contact if you need more help. Thanks for using FIX YA