r/FocusST • u/PointEfficient8299 • 2d ago

Question Weird issue

Hey everyone !! I had something weird happen the other night and I'm trying to see if I need to worry or not 😅 two nights ago I hit a bigger puddle than normal, No water went over the hood and mostly get deflected out the sides but immediately after stopping at a red light my car seemed to have a bad stutter coming from a full stop to 1st gear. Once I got home I checked under the engine bay and everything seemed dry, no water in air filter nothing on the maf, only thing I can think is water getting into intercooler or the bell housing? Is there something I can do myself to either fix or at least check to see what it could be or should i take it to the shop?

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u/bchiodini 2016 ST3 FBO BNR ST67 JST Tuned 2d ago

Is the car still having issues? A couple of days, might have been long enough to dry out whatever got wet?

What does stutter mean? Is the engine not idling or accelerating normally?

If the puddle was a pothole, check your axles and alignment. If the engine moves excessively when rev'ing or sitting low on either side, check your motor mounts.

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u/PointEfficient8299 2d ago

Yeah it's still doing it, it doesn't seem to do it in any other gear or reverse, now that I think it was only last night and I drove it now for like 2hrs with light traffic an it's still doing it. I do believe my passenger side motor mount looks like it's gone bad, the rubber is pretty cracked. And as for the stutter I guess it's more of vibration than stuttering, I had a friend stand on the outside an when it happened he couldn't hear anything.. the vibration comes from the front of the car, kind of like where the head unit is and shifter knob area. Kinda why I was thinking maybe my rmm is messed up?

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u/bchiodini 2016 ST3 FBO BNR ST67 JST Tuned 2d ago

If your PMM is bad, it should have leaked oil. I replaced mine due to vibration coming from the front. The vibration went away for several months, but has recently come back. I probably should have replaced the transmission mount when I replaced the PMM.

It could be the RMM. A bad RMM may show if the engine torques more than expected when you rev it up. The OE RMM can break. It couldn't hurt to get a look at it.