![]() On the return trip from the parts house and new battery install, the car broke down. The next day, I had to replace the battery and thus begins this tale of woe. The car broke down just miles down the road from where she bought it, and it was low on water and oil, once those things were added, she managed to get home. The **** thing had been sitting in a yard for who knows how long. The apple in her has been costing a ton of money and **** to pay for this blunder. ![]() She fell in love with the look of the car and could not resist buying it without even thinking about getting any advice from me. Hi guys! My girl friend recently bought a 99 Millenia S and I am suffering (I am retired HVAC tech with a messed up back and a host of other physical challenges). (I haven't removed the front and rear intercoolers, I just borrowed this pic from GSRex's guide, because it shows the engine without the MSE cover). From right above the supercharger pulley on the one side, to the other end of the fuel rail on the opposite side of the engine. ![]() The hose runs under the area in the pic with the dotted red line. I don't want to service those parts, I just want to replace the vacuum hose burried under them. (Not sure why - maybe the can be ruined if not done correctly). In the service manual, it strongly discourages removing those parts unless absolutely required for servicing them. I looks like I have to at least remove that to change the hose. The problem is that it is burried under the long intercooler pipe that connects the front and rear intercoolers to the supercharger. My question is has anyone ever changed that hose? ![]() This may be what is causing the poor fuel economy, because the engine is running rich all the time and wasting fuel. I think the vaccum leak is causing a false cut in pressure to the Fuel Pressure Regulator, causing the Fuel Pressure Regulator to run richer all the time thinking it is always in hot restart mode. The PRC solenoid valve cuts pressure to the Fuel Pressure Regulator to make starting a little richer during hot restarts. Discovered a big hole in the vacuum hose that goes from the PRC solenoid valve (Pressure Regulator Control) to the Fuel Pressure Regulator. I removed the "Miller Cycle Engine" plastic cover because I was hearing a "hissss" sound under there. I guess I have to wait till I get an answer from mazda regarding this then.I am getting poor gasoline fuel economy - 15.5 mpg.īeen trying to figure it out for a while. I have a CAI for that, and i'm waiting for a stock TB to arrive to study and enlarge. when i see a dyno for this mod done on a mz3, then yea- i'd delete it. i read the vtcs posts- many of which are butt dynos and some cels- no real hard evidence on a 3. Which contradicts the "closing" of the flaps at 3750 from the service highlights.īack to my initial question- how could the owners with deleted VCTSs feel any low end power when the flaps are open after the engine's warmed up anyway? Mazda claims this technology is used to improve emissions, not torque. The valve does not completely disengage until 3750rpm. At low RPMs, VTCS is needed to compensate for this. Intake charge speed is less of an issue on valves that do not open very much, but recall that Mazda's VVT does not vary valve lift. The faster intake charge then has the inertia to swirl around the combustion chamber and more thoroughly mix with the fuel for combustion. The valve closes part of the intake path, increasing the velocity of the intake charge. The variable tumble control system (VTCS) was created to help emissions at low RPMs. When a DTC for the engine coolant temperature sensor or throttle position sensor has been stored, the variable tumble control is inhibited and the variable tumble shutter valve is constantly open.ĭoesn't say how or why or when it's stored for the flaps to open. What i don't understand is this part at another section of the book: At this time, the intake passage is narrower than normal, increasing intake airflow speed and also creating a powerful air tumble in the combustion chamber. intake manifold vaccuum is applied to the varriable tumble shutter valve actuator by the operation of the variable tumble solenoid valve, closing the variable tumble shutter valve. 3750 rpm or more and engine coolant temp approx 63c (145f) and more (variable tumble shutter valve is closed) The book does not say that it opens up again.Įngine speed approx. After it reaches that RPM and the coolant is 63c (61.9 for the 2.0L) it closes again increasing power because of the intake air speed creating that tumble. Then it opens up again when the engine's warmed and below 3750 RPM. What i have read in the service manual, when the engine's cold, it closes to increase combustion efficiency, emissions, etc.
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