Alot of engine vibration

[GstStang]

For the last week or so I've had my engine start shaking alot! I've analyzed all the signs:
•It shakes only while in gear and acceleration. No vibration if I rev in neutral
•Vibration increases as I change gear and accelerate (i'm guessing ### of the gearing)
•The vibration is slower than as if a piston was misfiring
•No visible signs of anything unbalanced: No unbalanced tires or bent axel n harmonic balancer is fine
•It's NOT a misfire ### I've had plenty of those

My guess is that it's the flywheel is getting warped, last time I changed the cluch I was told that it would be the last time I can use it. I also drive my car pretty hard every now n then I just wanted other opinions, clutches n flywheels

 

[jpmxrider489]

Could it be as simple as aftermarket motor mounts?

 

[josh1095]

faster u go the more intense the vibration? speed up to where its shaking bad and throw it in neutral. tell us if it stops then.
gotta rule out flywheel right? u said it doesnt shake when u rev it in neutral. flywheel is spinning

 

[GstStang]

I forgot to add that but the engine mounts are stock and seem fine. I have the energy suspension inserts on the front n rear, I've had them on for years

Josh1095: the vibration does stop when thrown in neutral. That's why it's a mystery to me... The clutch still grabs fine

I'm gunna buy the engine side mounts next week to eliminate that possibility.

 

[josh1095]

well that removes the clutch/flywheel right? its speed related. u have an imbalance in either a wheel, tire, half shaft. or, even stranger, and im reaching here, if one of ## shocks isnt damping correctly u would notice something, not necessarily a vibration. thats a good one. under load is where misfires happen. i know ## sure its not, and i believe u, im just saying from personal experience.
so if you go up to 70mph, throw it in neutral and let it coast it shakes right? gotta be a drivetrain issue. check shafts, wheels, hell, even alignment

 

[Anubis_4_99]

well that removes the clutch/flywheel right? its speed related. u have an imbalance in either a wheel, tire, half shaft. or, even stranger, and im reaching here, if one of ## shocks isnt damping correctly u would notice something, not necessarily a vibration. thats a good one. under load is where misfires happen. i know ## sure its not, and i believe u, im just saying from personal experience.
so if you go up to 70mph, throw it in neutral and let it coast it shakes right? gotta be a drivetrain issue. check shafts, wheels, hell, even alignment

You must not have read his post, he said the vibration stops once thrown in neutral. Meaning the drivetrain is taken out of the equation.

OP, I would grill over your motor mounts, they can look fine but still be bad. My rear visually looks fine without getting right in to it, but once you do you can see it is ripped nearly completely out, which causes my motor to vibrate and hit the firewall quite a bit.

 

[josh1095]

sorry, i did read it. from what hes saying, hes implying sitting in park in neutral and revving it. then finding no vibration. only during acceleration is this happening. im just trying to rule out one of the possible culprits. if u rev an engine in park or not the flywheel is still spinning. i need a clear answer, does it happen if you just drive down the road while its shaking and then throw it inneutral. if it still occurs, its not ## clutch or flywheel, it has to be another moving component

forget what i said, 2 posts up he answered me. said it stops vibrating even while coasting when he throw it in neutral.
maybe clutch is grabbing and disengaging?? in just throwin wild guesses but sometimes they pay off. never experienced what ## having.
let me add, after re reading ## post, u might very well be right. in between shifts it shakes harder. that clutch could be camping the vibes from the warped flywheel like u said.
anyway please update: im very interested.
sorry for the useless posts bro, my bad. i misunderstood what u were saying

 

[GstStang]

Josh1095: it's not speed related, it's RPM related. On all gears it begins to vibrate but it's not really felt on 1st. I have put the car on jackstands n checked for anything bent while it was being ran and nothing looked off balance.

Anubis_4_99: I will be getting the side mounts because those are the ones I'm questioning

 

[josh1095]

that wasnt clear to me in the original post. apologies sir.
so just to be clear: when u lift the front end and shift through gears it shakes like hell right?
id be surprised if it were ## mounts

 

[Anubis_4_99]

Josh1095: it's not speed related, it's RPM related. On all gears it begins to vibrate but it's not really felt on 1st. I have put the car on jackstands n checked for anything bent while it was being ran and nothing looked off balance.

Anubis_4_99: I will be getting the side mounts because those are the ones I'm questioning

Does the vibration stop immediately once you put it in neutral while driving, or does it decrease slowly with engine rpms?

As for the mounts, if it's not felt in 1st gear i would almost rule them out, 1st gear gets me the most noise out of mine.

 

[josh1095]

anubis, with all due respect, i asked him the same question twice. drive it up to speed and go to neutral and see how it feels. motor mounts are not the prob here. he may have nailedit right on the head in his first post

 

[Anubis_4_99]

anubis, with all due respect, i asked him the same question twice. drive it up to speed and go to neutral and see how it feels. motor mounts are not the prob here. he may have nailedit right on the head in his first post

You have misread and misunderstood everything he, and now i has posted. And all of your posts have been pointless, barely legible banter, so how bout leaving the trouble shooting to people who can read and respond in better then a 3rd grade manner.

I'm asking for an extra point of specific information on the already answered question, which does have a point in helping pinpoint the issue. But since you seem to know it all i'll bow out and let you handle it.

 

[josh1095]

lo yes im a bit drunk. i quit. i can hardly type. but, OP, drunk as i may be i DO care about ## problem. i will re read this entire post tomorrow and see how dumb i look. i was simply trying to rule out possiblities and, frankly, u tellhim engine mounts?? and then ask the same question i asked. im drunk and probably dont understand. talk to yall tomorrow. have a great weekend. was that so illegible?

 

[GstStang]

Let me try and clear it up for anyone that reads this. When I start the car it all seems normal, if I rev it while parked and neutral it doesn't shake. When I drive it; 1st gear has very little vibration. 2nd gear is when you start to feel it more, even at low RPMs. 3rd 4th & 5th it gets pretty bad, I try not to take it more than 2300 rpm because it's hurts me to feel it shake that much and I don't think it's good for it THE VIBRATION ONLY OCCURS WHEN IN GEAR AND UNDER ACCELERATION. No matter the speed I'm driving it will stop shaking if I put the car in neutral or lift the throttle.

Correction: when I lift and let it coast I can still feel the shake but only slightly

I have already swapped my injectors, I had hoped maybe one was not spraying fully, but the shaking is still there.

 

[SoCalK61000]

Sounds like a bent axle.......didn't read the whole thread but is there a flashing mil?

 

[GstStang]

SoCal61000: What is a flashing mil? Sorry I'm not too familiar with some of the terms

Would that be the check engine light? I do have it on but it doesn't flash, I have RM code since I have a 6 bolt in it

 

[bryanwheat]

You haven't recently had a timing belt done have you?

 

[GstStang]

I swapped it out about 2yrs ago when I had taken the head off

 

[98zx23369]

sounds dumb and simple. but i have to ask, are your wheels torqued correctly

 

[GstStang]

dsmlover07: it's pretty severe, when I drive it I try not to take the RPMs any higher than 2300. Like I mentioned on my post the shaking is slower than if it was a misfire, I thought it was an unbalanced tire but there is no sign of anything being unbalanced

98zx23369: the tires are torques properly, that was the first thing I checked. I've had that problem before

 

[Lou98GSX]

if it only shakes under acceleration then it has to be one of the axles .

 

[GstStang]

Would that be visible? I've put the car on jackstands and had my brother drive it an didn't see any wobble on the axels just the engine shaking.

I think I have to take it to the tranny mechanic I go to and have him drive it

 

[dsmlover07]

Did you check the lug nuts, mine vibrated when my lugs were loose.

 

[bryanwheat]

if it only shakes under acceleration then it has to be one of the axles .

Actually if it were an axle or anything drivetrain related it would increase with speed, NOT rpm. It is is rpm dependent than it is in the engine.

 

[GstStang]

If it was something in the engine wouldn't it shake anytime I raise the RPM? No shaking when in neutral or out of any gear. I've been thinking it's drivetrain related but I can't figure out what and I don't really have the money to be guessing. The axels, clutch or flywheel have been my best guess because when I shift gears all those are disengaged and no vibration occurs

The rate at which it vibrates is what leads me to think it might be the cluch or flywheel because it's not a very fast vibration but it is powerful.