my car recently started shaking when the engine is running but in a full brake stop or in park. what could this be connected to?
What do you mean by that?
Is the Check Engine Light lit-up?
If so, is it on steadily, or is it blinking/flashing?
Sounds like a misfire bad enough to activate the check engine light. If it’s on have the codes read and post them here. If it’s flashing have it towed to a repair shop. Tell us the codes and we may be able to help you to save $ and fix it right.
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Engine miss, idle too low, vacuum leak, or any one of a dozen other causes.
Other than the CEL questions which have been asked I might ask if this came on suddenly or did it go from subtle to bad over time?
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Low compression in one or more cylinders could cause what you’re experiencing as well. Very hard to tell over the interwebz.
one of my old former Subarus developed a “slight shake” when idling, felt like car goes left/right with frequency matching engine rotation, very annoying… no codes at that time.
I tested compression and it was even between cylinders, replaced spark plugs since I was there… no dice… cleaning throttle plate did not help either…
what helped was a bottle of injector cleaner - idle became even quite fast, so I figured the trouble was the dirt on one of injectors
Does motor have vacuum assist brakes? I have no idea if Subies have power brakes.
Ever since the advent of disc brakes, I think that power assist has been a given on all makes of vehicles.
I think they have a rope with 2 cement blocks that you throw out the window to slow you down.