2007 prius, while driving up hill and accelerating hard (5k rpm checked with pro torque app) the engine will start to cut on and off bouncing from 4500 rpm to 5000 rpm, usually only happens in hot weather. Any ideas? I have replaced the engine with a lower mileage one and have gone through and replaced all the gaskets, chain and tensioner and etc. The onlybthing i didn't mess with was valves and pistons.( still drinks some oil ). I also installed a new cat converter and o2 sensor, cleanup the trotlle body . Any ideas?
The hybrid vehicle control ECU is the orchestra conductor for the car, and it decides how much power you're asking for, and how much to give you electrically, and how much to ask the engine for. The engine control module runs the engine at whatever output power and RPM the orchestra conductor tells it to. My first idea is that the difference between 4500 and 5000 RPM is not as large as I first thought when I read "engine cut out", and the engine is just doing what it is told.
You have a tachometer connected? I wonder what the red line is for the Prius 1NZ? I would think 5,000 would probably be getting close I don't know why I think that but it detuned 1.5 l engine couple to electric motors around $5,000 or so might be a thing I certainly wouldn't think it would be 7,500 like my 4AGE MR2.
Wonder what temps the HV battery sensors are reporting, and have you cleaned the HV battery fan lately? What does the MFD (center display) show for the HV battery state of charge when this is happening? (is the HV battery low/purple) Many older gen2's aren't able to climb large mountains at speed, best to pull over and force charge, then rinse and repeat as needed.
And with a hyrbid car there's times when you're using almost all electric or almost all engine... And mostly all electric power is pretty good because the engine backs it up, but in hot weather when your Air Conditioner drains down your battery pack and its mostly all engine you're using, especially with Gen2, you got a super underpowered engine and up at 4500 to 5000 rpm you're pushing its limits and are likely it's longevity if you're consistently spinning it up that high. Best to keep your RPM down closer to peak torque and accept that you have to do it slower because the car is designed to save gas not drive fast.
Use Torque to monitor ICE data such as RPM, throttle position and ignition timing. Try to see if the engine is being commanded to change RPM. Posted via the PriusChat mobile app.
