Mazda protege 5 2002 forum4/23/2024 It could hide the fact that you've fixed it by masking it with a new problem. Either way its something to consider and at this point you might want to make sure there's only fresh gas in it from here on out. Was it parked for a bit prior to the onset of your problems or was it parked because of these issues? If so then the gas might be causing issues with combustion and or clogging up injectors. John Curtis makes a great point, fuel quality is something to consider as well as it's effect on injectors. Please Log in or Create an account to join the conversation. Good luck and I'll be looking for a reply to help out. I'm not sure what you know about STFT & LTFT but I can offer a great YouTube video that would bring you up to speed. It may or may not be the cause of your problem but it still needs to be fixed. If that fuel trim data was after you fix the leaks then I would plug in your scan tool and take a drive. Something to keep in the back of your mind as you go further down the road and some of the information in there can be very helpful and educating. You can print out what you need before the month is over and keep it. I don't know where you are with this vehicle, but Mitchell vehicle diagrams offers a subscription, $20 for one vehicle for one month. If you can find diagrams/schematics and post them here it would help. Size of engine, # of cylinders, on and on. Without knowing specs on your car and doing google searches there's some more info that could be helpful. ScannerDanner channel on YouTube has some great video on 5v reference, it's importance and usefulness in diagnosing problems. If one sensor has 5v then chances are, being tied together, all sensors have good 5v and thats not the problem. Possibly why unplugged TPS could act like unplugging an O2 taking you back into open loop. O2, air/fuel, cam, crank, etc.) Alot of times they are tied together running back to pcm. Is the STFT & LTFT data from before or after leak repair? 5v reference is on all of your sensors. Remember wires that are problematic may only cause issues under load. Some to keep in the back of your mind and some to think about or check. Also occasionally disconnect saying it failed to communicate with the ecu. Other thoughts sometimes it takes a few tries to get into live data on my scan tool, says it's not supported. I can't seem to find anything wrong or broken with this car. I even did a compression test and checked the engine timing. I've checked for any loose or broken wires, exhaust leaks, and checked for power/ground at literally every connector. Other things I've done are clean the EGR valve, check fuel pressure, which holds good while running but drops off quickly. Fixing the air leaks didn't make any change. The first thing I checked was for vacuum leaks, using my smoke machine I did find 2 leaks (intake gaskets and injector o-rings). Although if I unplug the sensor the car runs fine as it's in open loop? MAF PID looks fine around 2.6-3.0 g/s idle, increases linearly It has a LTFT of around +8-10, sometimes higher (STFT stays close to zero). The condition gets worse as it fully warms up, sometimes to the point of stalling, and has hesitation up to about ~1500 RPM. The car starts up and runs perfectly when cold, but after 2-3 minutes, when it goes into closed loop it starts to idle poorly and shake. The car has a JDM engine with ~50,000 miles (85k on the odo). I have a 2002 Mazda Protege 2.0 with a rough loping idle.
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