Rich (From Twitter) @joehallenbeck.bsky.social · 24/07/2026Cleaned the 850 idle control valve and MAF but my idle is still erratic. Start up and my revs fluctuate up and down. My Lambda warning light is on too. Air leak somewhere maybe? 650
autoverse @autoversed.bsky.social · 24/07/2026For many years I had no idea what the Lambda badge on Volvos was, I assumed it was some sort of dealer network putting the badges on. 020
Rich (From Twitter) @joehallenbeck.bsky.social · 24/07/2026Calms down when it warms up but obviously this is a concern. It’s got a new throttle position sensor. There’s no obvious vacuum lines disconnected or damaged that I can see. Good job I’m not about to spend the next few weeks driving it hundreds of miles. 😒 520
Mike Fisher @arressveetwin.bsky.social · 24/07/2026Start with long nose pliers pinching clamping any air or vacuum lines. If the lambda light is on, it knows your air/fuel is out of whack. 010
Caleb is spooked (birthday) @airheadedaviator.bsky.social · 24/07/2026I had recent erratic behavior from my cars engine due to the PCV valve being worn out. Maybe thats the next fix? 110
Dan @oldvolvos.bsky.social · 24/07/2026Seems like a vacuum leak to me. I bought a cheap smoke machine for the old cars and it’s been very useful. 110
