95 Subaru legacy outback

Asked by Jan 30, 2016 at 09:26 AM about the Subaru Legacy

Question type: Maintenance & Repair

Engine vibration when cars in gear with foot
on brakes at stop light and car is in drive.
Put Into neutral and it levels off any
suggestions? Just changed plugs

10 Answers

57,445

Still a miss, may need a cap & rotor, & wires.

1 out of 1 people think this is helpful.

Thanks I will check that!

3,640

No, no, it's not ignition. Subie's ECM actually SKIPS a beat with ignition in order to depress idle speed! (You can see this if you use an old ignition strobe light, as it will flash intermittently on any one wire.) What happens here is a conflation of an unbalanced ignition (if you will), very low rpm, and too few bolts stiffening the engine-to-trans assy. So the whole car shakes at 600 rpm. To help lift it a bit toward 700-800 rpm, which will be MUCH smoother, start by making sure that idle air starvation isn't a culprit by thoroughly spray-cleaning the throttle body. Then CAREFULLY loosen the screws attaching the throttle plate assy on the side of the throttle body, and SLIGHTLY rotating it for a small increase in idle. (If you go too far the ECM will "catch" you, and replunge the idle and also throwing a check engine light for annoying it. The trick here is to get +50 to 100 rpm without waking up the computer to thinking you've messed with the butterfly closing position. Usually works fine, but of course ensure you have a nice clean TB before fussing with its door opening "crack" angle. I suppose you could also have a bad load of fuel, or a partially clogged injector, so chasig that with a bottle or three of cleaner in the tank isn't a bad idea. Also, are you SURE you didn't drop a new plug and pinch its anode down? Ha...we've all done that....

1 out of 1 people think this is helpful.
57,445

Hey there Subaru G. I think I'll leave Subaru questions for you, niece answer.

3,640

Don't go away! Your daughter appears to be the same age my GRAND-daughter, so you'll have to step in soon enough! What a nice motor, too. Ern

57,445

Hey there Mr. SubaruGuruBoston, thank you for the compliment! That is my Granddaughter, I have 3 Grand kids. I had to rest this afternoon, I just got back.

51,835

Good information Guru. Is there no feed back to reduce the cylinder cut out when the idle speed is too low?

3,640

Good question. One would hope so, but i'm not sure the ECM is that smart.

3,640

Rowefast, you mean you're an old fart too?!

57,445

No, but my mind says go, but the body says no.

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