Everything started with a bad Crankshaft Sensor (the motor suddenly went off on city and highway speeds and won't restart for a while).
I put a new Crankshaft Position Sensor on, aligned it carefully several times. It fired it up but ran badly and went off after a few seconds. I put a new harmonic balancer on, aligned the Sensor again and fired it up again. It stayed on and everything felt well for the moment, so I started driving it. Sitting in front of a red traffic light, the idle speed was still a bit high, maybe 200 RPMs and the idle was a bit rough. When accelerating you can feel a misfire. The more the motor warms up (after 10 miles) the more you can feel it. Climbing up hills is more or less impossible.
I checked the Camshaft Position Sensor and checked the magnet on the Camshaft Timing Wheel - Everything looks fine.
I put new sparks, spark plug wires, a new ICM and coil pack on. - Noting changed.
I took the wiring harness that connects the ICM with the sensors and the ECM out of a good running car. - Nothing changed.
I installed a new Mass Airflow Sensor and Idle Air Control Valve. - Nothing changed.
I checked vacuum lines for cracks. - Found nothing.
I put a new ECU in. - Nothing changed.
I sprayed some brake cleaner around the intake and listened to higher idle speeds. - Nothing happened.
I checked the catalytic converter to see if it was clogged. - No, it's 3 years old and still fine.
Checked fuel pressure by pressing down the little valve in the fuel rail next to the injectors. - There is nice pressure on it (new Fuel Pressure Valve, Fuel Filter and Fuel Pump were installed 2 years ago).
I checked engine oil for whether or unburned fuel, debris, metal flakes or any kind of smell. - Nothing special in there.
Other options are maybe the O2-Sensor and the Engine Temperature Sensor for the ECU (both came new 2 years and 20,000 miles ago).
Mabey a bad injector. I got them checked at least 2 years ago.
I'm not able to tell you anything about codes at the moment, because I don't have a test tool for the OBD and the bulb for the Check Engine Light seems to be burned. I will put in a new one to see if I can pull any codes by get it blinking with a wire clamp.
Again, the symptoms:
- Rough idle.
- Deeper sound out from the muffler and a bad unburned fuel smell.
- Higher fuel consumption (maybe 25% more).
- Jerking and misfire under load.
- Sometimes jerking and scratching sound from the belt tensioner in idle speed when it misfires.
- 200 RPMs too much in idle speed and engine warm.
As you can see, I'm running out of options. Hopefully you guys have further ideas. Any ideas are welcome.
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Sunday, August 7th, 2022 AT 3:11 AM