johannessturm53

Seat Arosa running lean diagnosis

Alright, I'm stumped. My 2003 Seat Arosa, gasoline engine, with 187142 km on it is running way too lean. The check engine light is on, and I'm getting reduced engine power, rough idle, and a nasty jerking when I try to accelerate. I've checked the usual suspects – spark plugs look okay, no obvious issues with the EGR valve. Could the catalytic converter be clogged? Or am I looking at fuel injectors here?

4 comment(s)

Sounds like what happened with my Arosa. I'd check the fuel injectors first. Had similar symptoms, rough running and loss of power. Did you check for vacuum leaks around the intake manifold?

Vacuum leaks, got it. So, your Arosa had the same jerking under acceleration? Was it consistent, or only under certain conditions? Also, were your spark plugs fouled when you checked them?

Yep, the jerking was almost always there when accelerating. Made driving a pain. I didn't check the plugs myself. Honestly, after poking around a bit, I just took it to the shop. They ran diagnostics and confirmed it. Could be other things, but the injectors are a prime suspect. Like a clogged artery, they'll starve the engine of fuel.

Right, that's what I figured. Took it to the shop, turns out fuel injectors were shot. 515€ later and it's running smooth again. Thanks for the heads up, saved me a lot of headaches!

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