Some threads say it could be the VICS system as well. And this makes perfect sense because I have a swapped computer from a Protege MP3 in my car, which will not recognize the VTCS system. I borrowed a pretty nice Bosch scanner from Oreilly's Auto Parts and it gave me a pending code of P0660 "Intake Manifold Tuning Valve, Control Circuit Open Bank 1".Īfter some research, the code seems to have to do with the VTCS solenoid. Mechanic's Assistant: VICS reads 0 ohms when I tested it. Fixed a vacuum leak by replacing the intake hose it runs better but still has the idle issue when in gear and warmed up. These DBElectrical alternators are trash! Q&A: Troubleshooting Rough Idle in 2002 Mazda Protege LX - VTCS Solenoid & V. Delayed shifts will cause acceleration issues. If the transmission fluid leaks, that needs to be fixed quickly. At idle it is putting out 14.4-14.5 volts (which I call high) but when I turned everything on (high beam lights, heat, defrost, dome lights, blinkers, etc.) and revved motor pretty good I was hitting almost 17.5-17.9 volts!! THIS IS A 2 WEEK OLD ALTERNATOR. Hard shifts could come up and that is not good. I have inspected all connections (good), did voltage drop tests on connections (+) and (-) from battery to alternator (good), and voltage tests. And if I have to return or warranty it there is a store about every 7-10 miles around here. I guess I have to wait till I get an answer from mazda regarding this then.I can get a new one with a lifetime warranty from advance auto for around $200 USD. 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. Recently the car would not start after I have driven it for a short trip and I try to start. I have been receiving a code P0090 on the vehicle. i read the vtcs posts- many of which are butt dynos and some cels- no real hard evidence on a 3. I have a 2003 Mazda Protege LX with 155,000 miles. 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. The 2002 Mazda Protege VTCS solenoid valve location is found by watching: The transmission fluid needs to be replaced every 30,000 to 60,000 miles. 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. What is the model number of the transmission of a 2000 Mazda 626 LX Automatic 4.0. 1999 Mazda Protege 1.6 L I have changed Bank one O2 sensor but did. car has no power but idles ok atleast it seems to. The variable tumble control system (VTCS) was created to help emissions at low RPMs. The PCM turns the VTCS solenoid valve OFF to maintain startability and stability during engine cranking and for 0.15 second. 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. No difference as check engine ligght still on and same code displayed. I replaced the VTCS solenoid valve because it seemed to have a low OHM of about 20. What i don't understand is this part at another section of the book: My Code Reader shows P2009 Intake Manifold Runner Control Circuit Low (Bank 1). 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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