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Author Topic: Non DSM - bad vibration when stopped, auto trans  (Read 523 times)

Offline Mike Schmid

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Non DSM - bad vibration when stopped, auto trans
« on: November 25, 2003, 01:43:51 am »
A friend of mine has a 1994 Cavalier, 2.2L 4cyl, auto tranny.  When stopped in any of the forward gears (D, 2, 1) the car shakes really bad.  I took a look at it today, engine mounts look good, the motor doesn't even shake all that bad from outside the car but you can really feel it when you're inside.  

Tranny fluid looks clean and clear red... The motor is from a 95' manual tranny car...

Only thing I could think was that there is no flex section on the exhaust and that could be sending engine vibrations through the chassis at just the right frequency to make it shake like a mofo.  

Any ideas?  

On a side note I joined the fuel cut club at 6500 RPM in second tonight... time for more mods   :D
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Offline Andrew Scott

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Re: Non DSM - bad vibration when stopped, auto trans
« Reply #1 on: November 25, 2003, 04:40:11 am »
Quote from: "Mike Schmid"

On a side note I joined the fuel cut club at 6500 RPM in second tonight... time for more mods   :D


WELCOME!

I suggest a group buy on some pairs of new underwear.
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Parked: 1989 240sx - Esso 87 octane, Superstore generic 10w30, Japanese automatic climate control, Pioneer AVIC-Z3 navagation, Tien Flex Coilovers, Poly bushings, R34 Brakes (front and rear), Cusco tri-point strut braces (front+rear), 1998 tail lights, rear+side valance, adjustable toe and camber arms, cusco sway bars, helical rear diff, Volk TE37s - For sale!
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Offline Michael Cummings

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Non DSM - bad vibration when stopped, auto trans
« Reply #2 on: November 25, 2003, 08:44:24 am »
i'm a member of the 5500 rpm fuel cut club...am i welcomed? haha
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Offline Kevin Standeven

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Non DSM - bad vibration when stopped, auto trans
« Reply #3 on: November 25, 2003, 11:52:26 am »
16psi, 16g, stock fuel system, no fuel cut for me.
that kind of scares me though...what if it should be cutting but isn't? :shock:

I don't think a lack of flex section would cause the shaking. If the engine mounts are fine, then maybe the engine is just vibrating way more than usual?  But kinda weird how it only does it when stopped in a forward gear. Tranny problems maybe, something skipped a few teeth?
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Offline Marty van den Bosch

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Non DSM - bad vibration when stopped, auto trans
« Reply #4 on: November 25, 2003, 12:06:11 pm »
A shake in-gear for an auto tranny is sadly common.

The older the car, the cheaper the car, the greater the shake.

My old Auto ESi shook a bit, enough for me to put it in N at lights.
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Offline John Hartman

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Non DSM - bad vibration when stopped, auto trans
« Reply #5 on: November 25, 2003, 01:32:38 pm »
Mike does it run like crap or just shake?  

Nice even shake, or "lumpy cam" kinda shake?

only in gear, its ok in P or N?
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91 Eagle Talon TSi 5spd awd.  GT-12, TriFlow Cams, 850s, Tial, JIC, Jackal, sticky rubber.
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Offline Mike Schmid

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Non DSM - bad vibration when stopped, auto trans
« Reply #6 on: November 26, 2003, 01:14:53 am »
it doesn't run real rough or anything... Like from outside the car it's difficult to tell the difference between P or N and a forward gear unless you're paying attention... Inside the car is another story, P and N are just normal idle vibrations for an econo car.  Then in D, 2 or 1 the car is shaking like someone cranked the bass... Panels buzz and rattle and such...
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DSMs - fun when they run

'92 TSi AWD AT - 180bhp
'93 TSi AWD - 195bhp
'90 Laser RS NT - *sold*
'71 Camaro - *sold*

Offline John Hartman

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Non DSM - bad vibration when stopped, auto trans
« Reply #7 on: November 26, 2003, 05:16:33 pm »
yea those and some other engines and even other manufacturers engines back then were pretty bad for that.  I bet its worse with the lights, heater and rear defrost on too eh?

Just a fact of life with an older cheap car.  :(
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91 Eagle Talon TSi 5spd awd.  GT-12, TriFlow Cams, 850s, Tial, JIC, Jackal, sticky rubber.
86 Merkur XR4Ti 5spd, rwd, turbo, 91,381km.  Original paint, heated leather. intercooled, big VAM, Full 3" exhaust, Cossie sway bar, 16" tires.
06 Mazdaspeed6 6spd awd, DISI turbo, heated leather HIDs, Corksport, Cobb, Konig, Centric...
2018 VW Golf Alltrack turbo Tornado Red, 6mt, some free mods

Offline Mike Schmid

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Non DSM - bad vibration when stopped, auto trans
« Reply #8 on: November 26, 2003, 07:06:30 pm »
Yeah, I was thinking it might just be that... I can't see anything obviously wrong anywhere, mind you, I haven't been right underneath but still, I could look around stuff pretty well and couldn't see any trouble.  Oh well...
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DSMs - fun when they run

'92 TSi AWD AT - 180bhp
'93 TSi AWD - 195bhp
'90 Laser RS NT - *sold*
'71 Camaro - *sold*
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