Engine running problems
Discussion
Hello everyone,
I have an intermittent issue that is occurring more and more frequently. Sometimes it happens right after starting, sometimes after a few minutes of driving, or even after a longer drive—the engine starts running unevenly (feels like it is running rich, and sometimes there is a smell of gasoline). Occasionally, the engine stalls. If it does not stall, it continues running in that state. Then I restart it (often while driving), and everything is fine again.
The idle stepper motor is new, and the behavior did not change after the replacement. The issue started gradually and has become more frequent—now it happens every other start or even during almost every trip. Otherwise, the engine runs very well.
Does anyone have an idea what I can test?
Cheers
Sven
P.S: This year, I have installed many new parts, including NOx sensors, air flow meter, fuel pump, fuel filter, and pressure regulator. None of it has made any difference to the issue....
I have an intermittent issue that is occurring more and more frequently. Sometimes it happens right after starting, sometimes after a few minutes of driving, or even after a longer drive—the engine starts running unevenly (feels like it is running rich, and sometimes there is a smell of gasoline). Occasionally, the engine stalls. If it does not stall, it continues running in that state. Then I restart it (often while driving), and everything is fine again.
The idle stepper motor is new, and the behavior did not change after the replacement. The issue started gradually and has become more frequent—now it happens every other start or even during almost every trip. Otherwise, the engine runs very well.
Does anyone have an idea what I can test?
Cheers
Sven
P.S: This year, I have installed many new parts, including NOx sensors, air flow meter, fuel pump, fuel filter, and pressure regulator. None of it has made any difference to the issue....
Firing the parts cannon is never a good idea really, aftermarket parts can be complete junk.
I would get yourself rovergauge and have a look at what's happening, someone here could analyse the logs for you and give you a clue.
Common areas are misfires and afm issues but no point guessing, misfires can be hard to spot on a noisy V8.
Try not to start these cars from cold and leave them idling on the drive, they can foul plugs quickly.
I would get yourself rovergauge and have a look at what's happening, someone here could analyse the logs for you and give you a clue.
Common areas are misfires and afm issues but no point guessing, misfires can be hard to spot on a noisy V8.
Try not to start these cars from cold and leave them idling on the drive, they can foul plugs quickly.
It may be worth checking the 100A fuse on the chassis. On a previous Chimaera, and on my current Griff, a cracked / corroded, but not completely broken fuse strip was likely causing voltage spikes to the ECU, causing it to run rough.
On the Chimaera, the warning lamp was faintly glowing, on the Griff I had no indication, but it fell apart when I removed it. With a new 100A fuse, they started to run properly, having a stable voltage.
On the Chimaera, the warning lamp was faintly glowing, on the Griff I had no indication, but it fell apart when I removed it. With a new 100A fuse, they started to run properly, having a stable voltage.
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