Peugeot 607 vacuum leak

I'm at my wit's end with my 2001 Peugeot 607 gasoline guzzler! The check engine light keeps coming on, and I'm pretty sure it's something to do with the air valve. I've fiddled about, checked all the obvious bits, and it seems like the hose connection from the pump to the valve might be buggered. Has anyone else had this? Mileage is sitting at 256655 km. It's driving me nuts with idle problems and occasional engine stalling!

4 comment(s)

Sounds like a vacuum leak. Have you checked all the vacuum hoses connected to the intake manifold? A faulty hose can cause fluctuations in manifold pressure, triggering the check engine light and causing idle issues. Any hissing sounds coming from under the bonnet?

I had a quick look at the hoses, but didn't hear any hissing. Is there a foolproof way to properly check them for leaks, short of replacing the entire lot? I'm trying to avoid that if possible!

A smoke test is the best way, but you'd need a machine. Given your mileage and symptoms, and the fact that you suspect the hose already, it's likely degraded. Honestly, for the sake of your sanity and the car's health, I reckon just bite the bullet and get them replaced. It'll be cheaper than chasing ghosts. Take it to a trusted workshop.

The advice was spot on. Took it to the garage, and they found a split in the hose, just as suspected. Replaced it, and all's well. Cost me 175€, but she's running sweet as a nut now. Appreciate the help!

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