maximiliandunkel31
C70 Vacuum Leak Manifold Pressure Sensor
Summary of the thread
A 2007 Volvo C70 owner experienced a check engine light, reduced engine power, sluggish response, and increased fuel consumption, suspecting a faulty manifold pressure sensor due to a vacuum leak. The issue was confirmed to be a large vacuum leak affecting the sensor. The suggested solution was to inspect for leaks and consider professional diagnostics. Ultimately, the sensor was replaced, and the leak was repaired, resolving the performance issues.
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4 comment(s)
maximiliandunkel31 (community.author)
Thanks for the quick reply! I haven't tried cleaning it yet, but I did give the hoses a quick visual check. Nothing obvious jumped out. Where exactly should I be looking for these vacuum leaks? Any specific spots that are more prone to issues on the C70?
matthiascrystal5
Alright, so you know how when a doctor can't quite figure out what's wrong, they run a bunch of tests? Vacuum leaks are kinda like that. They can be sneaky! Since you didn't see anything obvious, and with those symptoms, a dodgy sensor is highly probable. You could try spraying some starter fluid around the intake while the engine is running (idle will change if you find a leak), but honestly, at this point, I'd just bite the bullet and take it to a workshop. They'll have the proper diagnostic tools to pinpoint the issue and replace the sensor if needed.
maximiliandunkel31 (community.author)
Took your advice and went to a shop. Turns out you were right – large vacuum leak leading to a faulty manifold pressure sensor. They replaced the sensor and fixed the leak. Cost me 235€, but the car's running much better now. Thanks for the help!
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VOLVO
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C70
matthiascrystal5
Whoa, sounds like a drag! A manifold pressure sensor, huh? It's like the canary in the coal mine for your engine – super sensitive to changes. Reduced power and bad mileage screams sensor alright! Is it just a hunch, or did you try cleaning it or something? Maybe check for obvious cracks or loose hoses around the intake manifold first?