Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

engine shaking violently

Thread Tools
 
Search this Thread
 
Old 07-22-2009, 07:13 PM
  #1  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
engine shaking violently

so i put a k-kit in my car a couple of weeks ago. finally got it running good last week. i mean amazing. it was brilliant. however when i did the cam swap i did not get the timing cover sealed very good because it leaks oil bad. i thought however that it was the oil pan where it meets the timing cover so i took it took a local do it yourself garage and left the motor connected to the tranny but took out motor mount bolts, dist cap, and manual fuel pump because it was in the way of the motor mount bolts. after replacing the pan gasket, i put it all back together. could not get it to start i did all of the normal troubleshooting. well my starter started turnign over really slowly and of course i thought for sure it was a dead battery, after replacing the battery and the starter i realized it was neither. so i poured oil over both the heads thinking that somehow they may have seized and moved all of my plugs forward one position at the advice of the do it yourself help mechanic. it started rioght off. now that i have the timing and carb what seems to be set...... the motor has no power and rocks and shutters horribly durring acceleration and slightly during constant rpm or speed. any ideas is it possible that i bent rods or something or maybe worse?
Old 07-22-2009, 07:48 PM
  #2  
Member
 
csmith3's Avatar
 
Join Date: Jan 2008
Location: Central OH.
Posts: 111
Likes: 0
Received 0 Likes on 0 Posts
Car: 70T/A, 87Formula, 02Hawk, 06 GTO
Engine: 400, 350, LS1, LS2
Transmission: M21, 700r4, T56, 4L65-E
Axle/Gears: 3:55, 2:77, 3:45, 3:46
Re: engine shaking violently

Originally Posted by dvardaman85
so i poured oil over both the heads thinking that somehow they may have seized and moved all of my plugs forward one position at the advice of the do it yourself help mechanic.
Need some elaboration on these two procedures. But, is it safe to assume that you jacked the engine up to change the oil pan gasket? If so did the distributor hit the fire wall and bend the shaft? This would be a possible cause of the symptoms you describe. Then again, I don't know if you pulled all the plug wires from the distro and then maybe have them incorrectly installed on the cap? the firing order is 1-8-4-3-6-5-7-2. With more info we can figure out what's going or not going on.

So you guys have D-I-Y shops where you live? That's cool. We don't have those anymore because of insurance. You know somebody gets hurt they want to sue the garage for millions? Yeah that's why we don't have those here.

Last edited by csmith3; 07-22-2009 at 07:51 PM.
Old 07-22-2009, 08:14 PM
  #3  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

So you guys have D-I-Y shops where you live? That's cool. We don't have those anymore because of insurance. You know somebody gets hurt they want to sue the garage for millions? Yeah that's why we don't have those here
yeah im in the marine corps so there is one on base here that i can use for about 6 dollars a day and they have every tool except machining stuff.

[quote=csmith3;4228835]But, is it safe to assume that you jacked the engine up to change the oil pan gasket? If so did the distributor hit the fire wall and bend the shaft? This would be a possible cause of the symptoms you describe. quote]

no im pretty sure there is no way that i hit the dist on the firewall behind the engine because to be honest that was one of my main concerns. so i watched that like a hawk so to speak..

so i poured oil over both the heads thinking that somehow they may have seized and moved all of my plugs forward one position at the advice of the do it yourself help mechanic.
....---Need some elaboration on these two procedures
well it just kept turning over so slow and i was desperate for a answer as to why so i figured since it was dry and open for about a day maybe it had seized somehow and since you only put oil in one side if the engine i pulled the breather out of the opposite head cover and added a quart there...... as for the plugs i had the right order the guy thats works at the diy place just looked at my chiltens manual and said he thought that my plugs were exactly one off count clockwise, however i marked them and the dist cap before removal and they were exactly as they were when i drove it to the diy place.

only thing is i moved them right after i put the oil in so now i cant be sure which made the fix the oil or the plug wires.

But, is it safe to assume that you jacked the engine up to change the oil pan gasket?
yes you definetly cant get the pan off until you jack it up about 3 or 3.5 in or so.

origionally when it wouldnt start i just figured it was because i had taken the fuel pump off you know cause had to get that fuel running again and then i ended up flooding it really good for sure.


oh ya and during the whole thing of trying to start it, it did start once but i turned it off after i reved it up once and the engine almost came out of the car. i have never seen nor have i heard an engine sound like that when it started up. it was like all the parts were in the motor but none of them were bolted down

Last edited by dvardaman85; 07-22-2009 at 08:17 PM. Reason: making it readable
Old 07-23-2009, 12:12 PM
  #4  
Junior Member
 
irocinswfla's Avatar
 
Join Date: Nov 2007
Location: SW Florida
Posts: 26
Likes: 0
Received 0 Likes on 0 Posts
Car: White 90 IROC
Engine: 383 stroker w/ 425 hp
Transmission: 700 R4
Axle/Gears: Stock
Re: engine shaking violently

When in doubt and unsure of putting things back together correctly (like I've done), I always start with the simplest things. First was the car running good after the cam swap ? If so, then try setting timing from ground zero. Find tdc and line up your dist #1 to spark plug # 1 and make sure your firing order is correct. Should fire up at that point.
Old 07-24-2009, 04:19 PM
  #5  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

so start over completely with timing you think because its running already
Old 07-24-2009, 11:23 PM
  #6  
Junior Member
 
Njs305t/a's Avatar
 
Join Date: Jun 2009
Location: Long island, NY
Posts: 92
Likes: 0
Received 0 Likes on 0 Posts
Car: 1987 Trans Am
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73 posi
Re: engine shaking violently

Maybe you forgot to tighten the motor mounts.
Old 07-29-2009, 08:02 AM
  #7  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

ill go check right now but would that leave me with a loss of power to?
Old 07-29-2009, 09:38 AM
  #8  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

well just removed and reinstalled the distributor... did not fix it .... set timing about four times checked.... did not fix it. motor mount bolts are tight.... anybody got any other suggestions? it feels like the engine is shaking and my whole car is shaking... but during each little shake of the engine and car it feels like there is a great loss of power in the car and it actuallly sounds sort of quiet... any ideas at all would be great right now i am willing to try anything
Old 07-29-2009, 09:54 AM
  #9  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

just bringing this to the top in hopes of some help
Old 07-29-2009, 07:21 PM
  #10  
Member
iTrader: (3)
 
steeljab's Avatar
 
Join Date: Jan 2007
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
Car: 87' Camaro
Engine: 305 carbed
Transmission: 700r4
Axle/Gears: 2.73
Re: engine shaking violently

did it start running that way when you swapped the cam, or after?
Old 07-29-2009, 09:09 PM
  #11  
Supreme Member

 
afremont's Avatar
 
Join Date: Feb 2008
Posts: 1,004
Received 1 Like on 1 Post
Car: 90 IROC
Engine: 5.7 TPI
Transmission: 4L60
Axle/Gears: 3.23
Re: engine shaking violently

Make sure you didn't blow an injector bank fuse. Check to make sure you have power to both injector banks when the key is on.
Old 07-29-2009, 09:16 PM
  #12  
Junior Member
 
beatereater's Avatar
 
Join Date: Apr 2009
Posts: 44
Likes: 0
Received 0 Likes on 0 Posts
Car: 84 Trans am
Engine: 355
Transmission: TH400
Axle/Gears: 343 rear end
Re: engine shaking violently

i was just about to say that it could possibly be the fuel system... just something like a routine checkup all around..
Old 08-02-2009, 10:39 AM
  #13  
Junior Member
 
irocinswfla's Avatar
 
Join Date: Nov 2007
Location: SW Florida
Posts: 26
Likes: 0
Received 0 Likes on 0 Posts
Car: White 90 IROC
Engine: 383 stroker w/ 425 hp
Transmission: 700 R4
Axle/Gears: Stock
Re: engine shaking violently

Have not been on here for a few days. Check the compression in all cylinders. I swapped a cam and I messed up causing a valve to bend and break the spring. No compression in that cyl. gave the same symptom you describe. Engine shaking violently, loss of power and overheating.
Old 08-02-2009, 02:31 PM
  #14  
Senior Member
iTrader: (1)
 
F-Body Demon's Avatar
 
Join Date: Feb 2007
Location: Nashville
Posts: 551
Likes: 0
Received 1 Like on 1 Post
Re: engine shaking violently

How did you degree the camshaft when you installed it? And you might try moving all your plug wires 180 degrees. Believe it or not it will run with the timing 180 degrees off. Just not well. TDC for #6 can sometimes look like TDC for #1. I did a top end swap on a 396 and did just that. Moved all the plug wires 4 over and it ran like a champ.

Also where in North Carolina are you? Im Stationed over in Cherry Point.
Old 08-03-2009, 08:58 PM
  #15  
Junior Member
 
keithneubecker's Avatar
 
Join Date: Jun 2009
Location: Lowell, MI
Posts: 12
Likes: 0
Received 0 Likes on 0 Posts
Car: 1991 Chevrolet Camaro RS
Engine: 350
Transmission: TH350C
Axle/Gears: 3.23
Re: engine shaking violently

im kinda having this problem too. my car shakes like crazy when i accelerate. i just recently took the engine and tranny out and put them back in. i could possibly have the wires mixed up though. anyone know of a diagram of which wires are supossed to go to which plug? and flames came outta the carb a couple of time lol. but i get to go to cherry point too! im leaving in October for basic. my MOS is heli crew chief.
Old 08-08-2009, 12:09 PM
  #16  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

well congrats and good luck with the new occupation.

well i cleaned all the plugs and checked all the wires for about the 600th time. no problems.

crancked it over with each spark plug out one at a time and i could feel air being pushed out at each cylender from each plug hole but i dont have the compression checking tool and my car is stuck at the house till i fix this because i am not going to really break something you know. as for the rods none are broken because i pulled the intake off just now and they are all intacked.

can i tell if the valves are stuck or the springs are broken by pulling off the valve covers and looking at them .? keep in mind that my intake is currently removed so starting the car is now a no no since the dist is out and the oil pump wont be pumping.

i didnt see what i thought looked like abnormal wear and tear on the rods or lifters. obviously i cant really see the cam but

did it start running that way when you swapped the cam, or after?
it happened after i raised the engine and changed the pan last

Make sure you didn't blow an injector bank fuse. Check to make sure you have power to both injector banks when the key is on
\
i am going to have to assume this does not apply to me considering that my car is carburated

i was just about to say that it could possibly be the fuel system... just something like a routine checkup all around
i did check and also all of my fuel parts are brand new with the exception of the tank in the back.


any help please thanks if i did not answer any of your questions good enough then please ask me again and more into detail please i would really like to help you help me
Old 08-08-2009, 02:19 PM
  #17  
Supreme Member

iTrader: (4)
 
InfernalVortex's Avatar
 
Join Date: Dec 2005
Location: Macon, GA
Posts: 6,489
Received 21 Likes on 18 Posts
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.70
Re: engine shaking violently

Yeah you'll be able to tell if something goofy is going on with teh valves by pulling the valve covers. Look for broken springs and misalligned rockers.
Old 08-08-2009, 03:08 PM
  #18  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

well it looks like all the rockers are good and so are the springs is their any way to compress the springs to see if my valves are stuck. ?
Old 08-08-2009, 10:00 PM
  #19  
Supreme Member

iTrader: (4)
 
InfernalVortex's Avatar
 
Join Date: Dec 2005
Location: Macon, GA
Posts: 6,489
Received 21 Likes on 18 Posts
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.70
Re: engine shaking violently

well you can turn the motor over by hand and watch everything. But if you've got hydraulic lifters I doubt that will work all that well actually...

Last edited by InfernalVortex; 08-08-2009 at 10:07 PM.
Old 08-14-2009, 02:08 PM
  #20  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

ya couldnt tell anything guess im gonna pull off the heads tomarow to see if i can find the problem on the bottom side
Old 08-15-2009, 03:14 PM
  #21  
Supreme Member
 
JakeJr's Avatar
 
Join Date: Jul 2000
Location: Kempner,TX,
Posts: 1,014
Likes: 0
Received 0 Likes on 0 Posts
Car: 1996 Vette / 1992 GSX1100F Suzuki
Engine: 1996 Corvette Coupe 388 LT1 (+.060)
Transmission: Auto
Axle/Gears: 3.07
Re: engine shaking violently

The engine was running well BEFORE it began rocking and rolling, and only had an oil leak, right?

If all you did was remove the Distributor CAP and NOT the distributor itself, then your should NOT have moved the spark plug wires. There was no need to move the wires. Set the timing with a timing light, maybe, but move the wires. NO.

So you fixed the leak but MOVED the spark plug wires at the distributor cap and NOW it's rock and roll time.

Don't over-analyze this. Go back to the point where the engine was running well. Then identify what change(s) you made AFTER that point - that's where you'll find the cause. Whatever you changed is causing your problem.

Remove the #1 spark plug, crank the engine with your finger stuck in the spark plug hole and find TDC on the COMPRESSION stroke. The check to see where the distributor rotor's pointing and adjust the plug wires as necessary.

You could well have a couple of plug wires crossed - Have a fresh set of eyes look at how you have them plugged in. Sometimes people lose their objectivity after looking at the same thing for too long - Problem may be right in front of you but you're just NOT seeing it.

Jake

West Point ROCKS!
Old 08-15-2009, 05:01 PM
  #22  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

well i did have an ase buddy come over after work and duble check me. he said it was all good and he did set tit to tdc. it timed good and all. light was used. just dont know but i think that i jumped the gun by tearing the intake back off and stuff i just had a hip surgery and to be honest i think that i do not have the durability and the strength for this car any longer. i am going to sell it. it is a great car but i physicaly cannot keep up with the demand of this car anymore. if there is anyone out there who would like to see it or may be interested let me know vardaman6406@ec.rr.com. thanks for everyones help but this just cant be done by me anymore.
Old 09-18-2009, 08:47 PM
  #23  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

ha fixed it!!!!!!!!! the dang gum cap on my distributor had a groove in it on the side so when i saw that i looked really close at the rotor and then i saw it!! the rotor tip had actually cracked and chipped off and so at certain cylenders there was no connection for spark that is why my compression was good and plug wires and plugs were good but no good motor..... replaced cap rotor plugs and wires, had a pro come over and set my timing and show me how to tune my new carb and man that thing is mean now... well as mean as a 305 can be anyway thanks for everyones help this ended up a great success at a low cost god bless you all
Old 04-30-2010, 10:25 AM
  #24  
Member
Thread Starter
 
dvardaman85's Avatar
 
Join Date: Jul 2008
Location: NC USA
Posts: 144
Likes: 0
Received 0 Likes on 0 Posts
Car: 1985 Chevy Camaro
Engine: 305
Transmission: 700R4
Axle/Gears: 3.08
Re: engine shaking violently

ok so after a few weeks of running good now again it runs like crazy shakes. timing good valves and valve lash and springs all good. any thoughts at all just started shaking again even when not under load
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
apo_bailon15
TBI
4
03-28-2016 05:20 AM
Spyder_TheGamer
Tech / General Engine
1
12-25-2015 05:07 PM
Reddeath210
Firebirds for Sale
14
10-06-2015 08:20 AM
86White_T/A305
LTX and LSX
0
08-17-2015 12:16 AM
bradleydeanuhl
DFI and ECM
4
08-12-2015 11:48 AM



Quick Reply: engine shaking violently



All times are GMT -5. The time now is 02:38 AM.