Look on top of the engine at the inlet side of the fuel line from the fuel tanj and you will fine a Fuel Pressure Regulator. have it checked. It sound like it is stuck open. It is suppose to open and close to regulate the proper pressure to each of the fuel injectors.
1992 & 1998 Chevy Lumina 3.1L ECM Box LocationI finally found it on my 1992 Chevy Lumina 3.1 Liter. It is on the right side of the engine compartment behind the overflow reservoir container bolted to the shock tower. 1998 Chevy Lumina 3.1L ECM Box LocationI found it on my 1998 Chevy Lumina 3.1 Liter. Car: It is on the right side (Passenger side) of the engine compartment in front the overflow reservoir container and behind Radiator Cap.It is also under small fuse box.The ECM is in small black plastic box (about 1.5 Gallons).You remove the engine right bracket (3 -12 mm bolts) to get to this box then remove two clips on the black box cover... the ECM has two plugged in multi conductor cables. Using nut driver 9/32 th inch (7 mm) to take out these cables .ECU has part # ID 16236757
this is rhetorical when you think about it. when you have more cylinders, you have more power, but less fuel efficiency, and vice versa. In this answer its not all completely correct in some cases a multi-cylinder engine can have a better fuel economy compared to a single cylinder engine, it depends on the capacity of the of the cylinder, the size of the valves and how much they allow the fuel and air mixture (in S.I engines A.K.A petrol engines) or air for diesel engines. One reason that i know of for a multi-cylinder engine to be preferred to a single cylinder engine is because it gives less stress to the engine when running it also causes the engine to be more stable. In addition a multi-cylinder engine has less time between power strokes so the engine is more efficient.
as you are looking at the engine, the valve is located on the right in back of the engine. there is a vacuum line coming from it toward the front and the shrader fuel bleed valve is on the back, and there are the 2 fuel lines in the back also ==Sub-Answer== The above answer may work on a carburated system BUT (there is always one in the crowd): If you are looking for the Fuel Pressure Regulator (FPR), on a 1992 Chevy Lumina with a 2.8, 3.1 or 3.4 Multiport Fuel Injected engine, try looking under the Plennum. The plennum is that fairly flat thing that sits right on top of the engine and has either, 2.8, 3.1 or 3.4 Multi Port FI stamped on it. If you are going to replace the FPR, be sure to buy a new plennum gasket set. It should have 2 plennum gaskets and a throttle body gasket. You may also want to get new O-rings for the FPR as well (depending on how old they are) and an EGR (Exhaust Gas Recycler/Regulator) gasket. When removing the plennum, be sure to have a torque wrench as well -- most Chevy Luminas have an aluminum plennum and if you tighten the bolts back down too tight, you could crack the plennum and basically have a big headache on your hands (plennums aren't cheap) and seeing as this is part of the air-intake for your engine, a cracked plennum will start sucking in too much air and pretty much shut your engine down.
no its a throttle body injected engine smokingallowed say's...Fenner82 is on the right track but not completely correct. His "TBI" engine has 1 fuel injector "squirting fuel strait down into the throttle body", and your Z24 has a multi-port injection system(1 fuel injector for each cylinder) which "squirts" fuel into the intake at the engine head.
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