Engine Vibration at 1700 rpm - Chevy SSR Forum
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post #1 of 11 (permalink) Old 04-25-2019, 04:56 PM Thread Starter
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Engine Vibration at 1700 rpm

Hi all,

Perhaps someone here knows the answer to this. I have a 2003 SSR 5.3 with automatic tranny. The engine has started a curious vibration at a steady throttle of 1700 or so RMPs. Standing place or driving. I have an LS9 cam that was installed professionally, and performance torque converter and 4/11 rear end gears. The engine performance is still very strong. The vibration can be felt through the steering column and floorboards through the seat. Again it will do it sitting with the throttle depressed to 1700 rpm in park. I just had a new harmonic balancer installed and the problem still remains.

Is there something you all know about this condition?

Thanks to all of you in advance of your responses or answers.

I did make an effort to search for "Engine Vibration" in all the forums but to no avail.

Stew

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post #2 of 11 (permalink) Old 04-25-2019, 05:47 PM
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A few items I would suggest to check:

Spark plug not firing** due to Bad coil, spark plug wire or spark plug
Rocker arm** push rod or valve spring broken or out of adjustment
check for metal in oil** that may show worn cam roller, cam lobe

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post #3 of 11 (permalink) Old 04-25-2019, 06:35 PM
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I assume that you have had codes checked

Have someone hold the engine speed to where the vibration is the worst --- observe the drive belt tensioner. They can cause a severe vibration. The decoupler pulleys found on 05 and 06 models can be even worse when these pulleys do not freewheel in the opposite direction as they are intended to do. Watch the belt for any sings of "bouncing" at that engine speed.

Just a thought --- I can't feel it from here and its hard to really tell sometimes without feeling or hearing the problem
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post #4 of 11 (permalink) Old 04-28-2019, 06:56 PM
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Is it 1700 RPM and up or just "around" 1700? I'm assuming the rest of the engine was left untouched - still factory short block and heads? Since you say it happens in motion or not, then it has to be from trans forward. Given that you replaced the balancer, I'd be looking at the flex plate and converter.


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post #5 of 11 (permalink) Old 04-28-2019, 10:15 PM
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Quote:
Originally Posted by S2NAZ View Post
Hi all,

Perhaps someone here knows the answer to this. I have a 2003 SSR 5.3 with automatic tranny. The engine has started a curious vibration at a steady throttle of 1700 or so RMPs. Standing place or driving. I have an LS9 cam that was installed professionally, and performance torque converter and 4/11 rear end gears. The engine performance is still very strong. The vibration can be felt through the steering column and floorboards through the seat. Again it will do it sitting with the throttle depressed to 1700 rpm in park. I just had a new harmonic balancer installed and the problem still remains.

Stew
Based on what you have said, I would want to have the shop that installed the torque converter do a little inspection work. Your symptoms indicate that it is a heavy enough vibration to be felt in the steering wheel, floorboards and seat. I would want them to check torque on the flex plate bolts........

My two cents,

Mike
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post #6 of 11 (permalink) Old 04-29-2019, 12:25 AM
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Quote:
Originally Posted by Mike in AZ View Post
Based on what you have said, I would want to have the shop that installed the torque converter do a little inspection work. Your symptoms indicate that it is a heavy enough vibration to be felt in the steering wheel, floorboards and seat. I would want them to check torque on the flex plate bolts........

My two cents,

Mike
Agree with Mike!
Could be loose bolt on TC or one was over torqued.
If so you would also have a vibration at or slightly above idle but may not notice it because of that cam, you may also feel it at around 5000rpm but I would not recommend pushing it that hard until you get it checked.
Greg
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post #7 of 11 (permalink) Old 04-30-2019, 03:25 AM Thread Starter
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Thanks for your responses. After further investigation, it does appear to be torque converter related. Goes in next week to have it replaced and further inspected. Thanks for all your input!

~Stew
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post #8 of 11 (permalink) Old 05-16-2019, 08:51 AM Thread Starter
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An update for you all. They came to the conclusion it was something that had to do with the Torque Converter. It was unbolted and then rotated then bolted up and the bolts all re-torqued making the vibration "less". I was asked to come by and start the truck to sere if I felt it was changed. Started it up and no vibration at 1700 now but at 1200-1300 rpms it now vibrates in that rpm range. So having told them that and demonstrating that vibration they ordered a new torque converter and installed it. It was balanced right at the manufacturer as the performance show watched. Re-install then produced the same result. So, the slid the tranny back, unbolted the torque converter and slid it back then started the engine. Same vibration. This in essence eliminated the trans and converter. The flex plate looked fine so now they are saying it's something in the engine causing the vibration.

I know there was mention of a serpentine belt idler going bad so I'll probably unhook the belt and re start the engine and see what effect that has.

The adventure continues :P

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post #9 of 11 (permalink) Old 05-16-2019, 09:05 AM
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Sorry for your troubles, but a huge thank you for providing feedback on your problem for the benefit of everyone on the forum.

Fingers crossed that its the idler pulley ...
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post #10 of 11 (permalink) Old 05-16-2019, 09:28 AM
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Vibration

A faulty idler pulley could be observed with the engine running to see if it induces the vibration by its fluctuation. As an external engine component I've not seen one of those cause the pronounced type of vibration you are describing that transmits through the floor and steering wheel. And having eliminated the torque converter and flex plate as potential causes, the harmonic balancer is the other part you said was replaced. That seems to be a candidate item to investigate, as it appears your truck has an out-of-balance condition in a narrow RPM band.
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post #11 of 11 (permalink) Old 05-16-2019, 11:26 AM
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Being you eliminated everything on the back of the motor the next step is the front. You said you already did the harmonic balancer and if all the pulleys and belt tensioners check out it would seem it is internal. Being the only work you had internally is the cam install that would be the next area to check. Maybe something came loose or failed in that install. Keep eliminating and let us know what finally works. Good luck


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