8Mud
NAXJA Forum User
- Location
- Central Germany
I've had the same thing happen numerous times for different reasons. Until the engine heats up a bit it runs on preset program fuel, after it heats up it switches over to O2 sensor fuel metering.
I'm guessing the O2 sensor switch over isn't working right, either the O2 sensor or the wiring. Happened to me, it eventually threw a O2 code after the O2 sensor was dead, dead,dead, not while it was failing and I was getting intermittent issues.
Second, possibility is the CPS is getting low input voltage. Happened to me, the CPS tested good it wasn't.
Third, something fuel pump related, either low voltage or a bearing that starts to seize when it warms up. Happened to me, I had a connector slowly cooking and it acted like a resistor and cut my fuel pump voltage/amperage way down.
Fourth, Coil heats up and craps out, fairly common. It may not fail completely every time, but can make such a weak spark the motor barley runs.
If you figure out if it is fuel or spark this can really help narrow down the probable causes. If it is both it can also narrow it down.
I'm guessing the O2 sensor switch over isn't working right, either the O2 sensor or the wiring. Happened to me, it eventually threw a O2 code after the O2 sensor was dead, dead,dead, not while it was failing and I was getting intermittent issues.
Second, possibility is the CPS is getting low input voltage. Happened to me, the CPS tested good it wasn't.
Third, something fuel pump related, either low voltage or a bearing that starts to seize when it warms up. Happened to me, I had a connector slowly cooking and it acted like a resistor and cut my fuel pump voltage/amperage way down.
Fourth, Coil heats up and craps out, fairly common. It may not fail completely every time, but can make such a weak spark the motor barley runs.
If you figure out if it is fuel or spark this can really help narrow down the probable causes. If it is both it can also narrow it down.