Car was running fine, parked for a week or so and now dies immediately after start (doesn’t stop like it’s low on fuel, stops like if I were to turn the ignition to off). No amount of throttle changes this behavior. I did some Internet research and found that disconnecting the MAF sensor might lead me to the cause if it runs after disconnect. Exact same behavior when disconnected. While in the engine bay I found that if I disconnected the Boost Pressure Solenoid, it started up and ran (idle was a little high, but seems to run okay). The fact it’s running when that solenoid is disconnected leads me to believe it’s not (at least entirely) a fuel delivery issue. Would you expect that the solenoid itself is the issue, or does that lead you to expect it’s some other issue.
Some background history that MIGHT be helpful. Radiator cracked sometime last year (saw low coolant light and stopped before engine got hot), finally got it replaced in Jan or Feb. Took for a test drive and was running fine, then stalled on us right as we left the neighborhood. (Threw a fuel delivery code, but only once, and I didn’t take a pic. Didn’t show in history or active codes) Would not start. If it did start, would die shortly after (felt and seemed like fuel delivery issues, with a sputter stop). Let it sit a few minutes, and then was able to drive it home without issue. Have since driven it far and at freeway speeds without issues.
Car shows 2 engine codes, will provide images in comments.
P0140 P0141
Stored codes P0036 P0140 P0141
None of these are NEW codes, it was running “fine” with them.
Any problems with accelerating?
I’m not very familiar with Volvos or boost systems. Check the hoses coming from the boost solenoid for damage. It could be a massive vacuum leak causing it to shut off the moment the boost solenoid opens. The boost solenoid may not be opening when unplugged which is why the car runs.
Ooo good question. I didn’t want to drive it while it was unplugged because I’m honestly not sure what it does. (I understand it controls the airflow to the waste gate, but beyond providing more air for combustion, I don’t know much about turbos)
Before this, I didn’t have any issues accelerating. I could feel the turbo kick in when I ask for some umph.
Hopefully it’s just a damaged hose! That’s where I’d start. Where I am mice are a problem and anything that sits ends up chewed on lol
I checked what I could trace from the hoses. The one yellow marked one, and the blue one I can see and follow to where they terminate, and I didn’t see or feel any significant issues.
The lowest yellow hose
(the one under my thumb) I can’t follow, but a few small tugs, and I’m reasonably certain it’s connected at the end as well.
Rats, I was hoping
In your experience, would simply having a couple pin holes or small tears be enough to cause what I’m seeing? At least one of the hoses felt really rough on the outside, I would not be surprised if it wasn’t totally intact.
No small holes would cause it to run rough and accelerate poorly I would think. Though with your O2 sensors not working the computer won’t be able to compensate for any vacuum leaks.
So, mixed news. You can check my updates to the other commenter, but in general new hoses (2/3) didn’t help, leaning towards fuel issue. Gonna look into diag. Never fixed something like that before.
Best of luck! You can rent a fuel pressure gauge from most auto part stores!