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92 Geo Prizm vibrates rough at 1200-1800 Rpms
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Big-T
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Nov 2, 2008, 4:20 PM
Post #1 of 9
(1871 views)
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92 Geo Prizm vibrates rough at 1200-1800 Rpms
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Hello all my name is Tony...I am good with my hands but def not a motor head...I can do lots of things on my own when i find the problem that needs to be fixed.I am here today cause i can not even find the problem to fix it, And would like a large range of knowledge to try and steer me in the right direction,Ok i am tring to fix my girl friends car...It's a 1992 Geo Prizm Lsi with 195,000 miles and a 4 cyl 16 valve Fe motor in it(After research its same as a Toyota Corolla)..I am not the driver of this car so i can only go off what she has told me...I know the car ran ok for it's year and miles...But out of no where she has this bad engine vibration that is very bad...I went to the easy things first which were indeed busted to pcs(Engine mounts and trans mounts)..Did not fix the problem..This problem does not require the car to be moving to do this so i scratched off tires/Drive line(Axles)..This accures at somewhere in the range of 1200-1800 rpms,At idle it's fine...and at a higher rpm it's fine....I have pull trans and dropped oil pan and i still do not see nothing that would cause this..I was told a bent piston rod could do this(From A LOCAL SHOP)..But i put all cyl at top dead center and stuck gauge through spark plug hole and not even a slight diffrence(I figured that was enough to take that off the list)..I was wondering if a bad torq conveter could cause this prob..I also notice when i dropped trans it was marked with yellow marker 97 corolla as well as the torq converter(So i know it's either used or a junk yard item)...But it was the one in there since she owed it....Plus i was also told to remove all belts and try to wiggle all pully's up down and back and forth(Still nothing)..I was told the main pulley is a balancer norm made with rubber in it which i could see,But no noteable damage....If anyone has heard of this or could give me simple things to try i would love to soak in the info and give it a shot...Also while the car is running and in park could something inside trans cause this...?.....Thanks for your time and i will be checking back daily....She has my car and i want it back(Smile)...
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dmac0923
Enthusiast
Nov 2, 2008, 5:22 PM
Post #2 of 9
(1867 views)
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Re: 92 Geo Prizm vibrates rough at 1200-1800 Rpms
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you seemed to have covered the basics pretty well.
my recommendations would have been
motor mounts
trans mount
axles
transmission input bearing
you may be onto something with the harmonic balancer. I have heard of harmonic balancers 'shifting" meaning the rubber and the metal are no longer one piece and is taking the motor rotating assembly out of balance ever so slightly
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Big-T
User
Nov 2, 2008, 5:29 PM
Post #3 of 9
(1865 views)
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Re: 92 Geo Prizm vibrates rough at 1200-1800 Rpms
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Well yes as i stated i am good with my hands and try alot before i ask questions.I am a suspension mech for cars and rigs just not a daily motor guy....Again i have trans out and oil Pan down as of today and am lost on whats the issue here ...Trans has leaks so i wanted to seal it anyhow so i figured i could look to see if the prob was there somewhere and while it's down and out i will do rear main seal...The problem here is many things can be done while i have it apart but i hate to do all this and find out that i can't solve the problem i am here asking about just to turn around and junk the car....Grrrrr
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Big-T
User
Nov 4, 2008, 3:01 PM
Post #4 of 9
(1857 views)
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Re: 92 Geo Prizm vibrates rough at 1200-1800 Rpms
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Ok...Does anyone know if this car that i posted about in first post have a balanced cam in it (16 valve Dohc Fe model Motor)
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DanD
Veteran
/ Moderator
Nov 5, 2008, 4:43 AM
Post #5 of 9
(1850 views)
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Re: 92 Geo Prizm vibrates rough at 1200-1800 Rpms
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I had a look through the service bulletins that I have and found nothing directly concerning engine or trans vibrations. There was one article on the torque converter’s clutch coming apart causing a shudder but I’m not sure if this would address your concerns?
If you don’t physically find anything, put the car back together and try starting the engine with the torque converter left undone, from the engine. If your vibration is gone, you’ll know what you’ll be doing again; it always comes apart easier the second time. LOL
Sorry I don’t mean to make fun of but that’s the joy of searching for something that doesn’t want to give up its secrets.
I don’t think this engine uses an internal balance shaft?
When you checked the harmonic balancer did you try running the engine with the belts off? I’ve had water pumps or AC clutches not make a sound but the bearings be all but destroyed?
Dan.
Canadian "EH"
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Big-T
User
Nov 5, 2008, 2:21 PM
Post #6 of 9
(1840 views)
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Re: 92 Geo Prizm vibrates rough at 1200-1800 Rpms
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Well no worries about poking fun,I have torn stuff apart many times just to find the problem and your right second time is always easier..(Smiles)...So back to the topic,I spoke with a local trans guy that has been in bizz for many years here local and explained the issues.. And thats who said he was not sure of this motor But has heard of the balance cam chain or something to that matter would get wacked and cause a shake/Vibration...He also noted to me about unbolting torq converter as well as you noted start motor and see if i still had it(I didn't know i could do that duh!!) So i am going to reseal the whole trans and rear main seal and throw it in and see what i have....I also was told by the trans guy that the main pulley may not wobble, And by hand could not tell if the rubber was bad but it could spin inside itself to throw it out of balance,So...1st i would like to thank you for looking that up for me cause i neither couldn't find anything about a balance cam for this car.....And thanks for your thought about the other pulleys,But if you was here you would know for a fact it was not no water pump pulley(lol)...This is a crazy vibration...But be sure i will check them all before i put belts back on,Also i checked the main pulley while belts were off(No tension)....I will do what i stated and keep yah posted on progress and or help if i need more...Thank's Tony...Any advice while i am getting to this i will soak in to my thoughts....
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Loren Champlain Sr
Veteran
/ Moderator
Nov 6, 2008, 5:11 PM
Post #7 of 9
(1829 views)
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Re: 92 Geo Prizm vibrates rough at 1200-1800 Rpms
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Tony; If you haven't reinstalled the trans already, check the flex plate very carefully for cracks. Between the torque converter, flex plate, and harmonic balancer, sounds like you are on the right track. And, with your attitude, I'm pretty comfortable in saying that you'll succeed in finding the problem. Good luck.
Loren
SW Washington
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Big-T
User
Nov 6, 2008, 6:55 PM
Post #8 of 9
(1826 views)
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Re: 92 Geo Prizm vibrates rough at 1200-1800 Rpms
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Well i am on hold do to going to my girls this weekend,But i will be back at it after the weekend and need to get it out of my shop where i work...(Kinda taking up a bay from my boss(Not Good lol)...When you say flexplate do you me Flywheel..?...again not a motor head so words and terms my get me by surprise...Thank you all once again...Tony
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Big-T
User
Nov 16, 2008, 3:25 PM
Post #9 of 9
(1790 views)
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Re: 92 Geo Prizm vibrates rough at 1200-1800 Rpms
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Ok my online friends/Helpers...I had time to return to this project and here is my results....
If you rem i had removed trans to get a further look.....Well trans turned out ok.....Flywheel was ok.....so i resealed rear of motor and reseal the whole trans/and new filter...I put it together enough to start it with out torq converter connected........(No vibration)....Then i bolted torq verter back up....(Still no vibration)......So i installled all the belts and replace a cv boot ..Lowered the car and took for a drive and still ..(No vibration)....So i ask myself...What and where did the vibration go....And what caused it....Am i happy it's gone...Yes....Am i bothered i didn't do crap that should have fixed it, Of course.....I would have like to knowN what fixed this issue....Grrr....I didn't even get to change the main crank pulley ,Vibration was gone before i got that far......Hummmm i am puzzled... Tony
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