Back again for more fun and games with the 04 XC70. A couple of weeks ago the wife had mentioned in her drive cycle she received the "Reduced engine performance" message, and a VIDA readout showed throttle body codes. I drove the car for the past week, and the issues started getting worse. 50% of the time upon starting up, it lowers to its' regular 700rpm idle, then it sputters and dies on me. It also happened last night when slowing and approaching a left turn as well. I believe my plan of attack should be to inspect/clean the throttle body, and address a vacuum leak as detailed below.
Troubleshooting so far:
1) Cleaned the MAF (seems to be the #1 hail Mary I keep reading on other threads)
2) Located and fixed multiple vacuum leaks on the hose tree with the check valves that feed the purge valve up front. Replaced with all new 5/16 and 3/8 hose. Clean and verify check valves functional.
3) Performed glove test, great vacuum pulling glove in
I can still hear a high pitch whining/air noise change tone when doing mid/heavy accel. I had the OTE and connecting hoses off the car when I did my alternator last month and upon inspection didn't notice any cracks on the hard plastic or rubber hoses/pipes, and also verified all my hose connections, so I think my leak is elsewhere, and require a smoke test. I've researched and found a few threads regarding smoke testing, however, I'm more of a "VISUAL" learner
could someone tell me or show a picture of a simple way to introduce smoke into the vac lines? I was planning on removing the tube just prior to the MAF, covering with a glove and band, then removing another ideally 3/8 line (because I have a barb and extra hose) and blowing smoke into it. Just trying to grasp what would be the most effective method here.For the throttle body troubleshooting, what would be the most pertinent information from VIDA to post here? I was reading another thread where the guy's throttle position was stuck at 12%, is that highly helpful info for troubleshooting a bad TB? I performed the TB calibration, and heard the TB chattering doing it's thing with key in POS II. I, however, don't have an option for an ETM sweep test in VIDA (I suppose because it's an 04, likely Bosch unit), so I can't rely on that particular function within VIDA.
Thanks again guys. Been quite the saga this summer. Replaced ball joints, wheel bearing failed, alternator failed, muffler fell off, now this TB issue. Hopefully this thing calms down so I can relax a little bit soon. abscate will make fun of me, but I want to ensure my next order online has everything I need (TB Gasket, perhaps additional air hoses) because my local parts stores carry no stock of the volvo stuff. Hence why I want to do as much troubleshooting as possible prior to putting an order together.
