Car vibrates at 800 RPM, no codes

Tiny
COVEMAN
  • MEMBER
  • 2013 CHEVROLET CRUZE
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 65,000 MILES
Runs fine other than the vibration at idle feels like you are in a massage chair. Rpm does not fluctuate. Spark plugs look okay. With the clutch in or out it has the same vibration. 105,000 km.
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Friday, March 6th, 2020 AT 9:39 AM

19 Replies

Tiny
SCGRANTURISMO
  • CERTIFIED MECHANIC
Hello,

While researching this problem I came across this Technical Service Bulletin[TSB] for your vehicle's problem. You might want to contact your local dealership and talk to the service manager and see if you can get your vehicle fixed under warranty. Even if your vehicle's warranty is over, sometimes they can fix your vehicle and not charge you under customer locality. Please go through this TSB and get back to us with how everything turns out. I hope that this helps out.

Thanks,
Alex
2CarPros
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Friday, March 6th, 2020 AT 2:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
It sounds more like the engine has vibration and not a runnability problem. Engine mounts can cause this. Can you raise the hood and rev the engine in neutral to see if the engine has excessive movement please?

Can you please shoot a quick video with your phone so we can see what's going on? That would be great. You can upload it here with your response.
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Friday, March 6th, 2020 AT 5:47 PM
Tiny
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  • MEMBER
Steady rpm at 800, and motor mounts all look fine.
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Tuesday, March 10th, 2020 AT 4:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
Thanks for the video. it must be low compression on one cylinder. lets do a test by following this guide. Can you remove all spark plugs, keep them in order and check the color differences?

https://www.2carpros.com/articles/how-to-change-spark-plugs

and

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run down this guide and report back.
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Wednesday, March 11th, 2020 AT 10:30 AM
Tiny
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  • MEMBER
All the spark plugs look the same. A light cream. A bit of black carbon around the bottom of the threads. Could sea foam work or is that not a good idea? The engine runs smooth in the morning until it warms up. Then it vibrates at 800 rpm's but if you rev it up to about 1,000 rpm's the vibration goes away. Do these cars still have a idle control valve on the throttle body? It also has a burnt rubber smell if you rev it up around 3,000 rpm's.
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Wednesday, March 11th, 2020 AT 11:06 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
That is a strange problem, did you do the compression test?
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Wednesday, March 11th, 2020 AT 11:08 AM
Tiny
COVEMAN
  • MEMBER
Still tracking down a test kit. I will let you know when complete. Should I do a wrt and dry or just dry?
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Thursday, March 12th, 2020 AT 11:25 AM
Tiny
SCGRANTURISMO
  • CERTIFIED MECHANIC
Hello again,

Do a dry compression test first. If and when you find the low cylinder than do a wet test on that cylinder. You do this by pouring a teaspoon full of clean engine oil down the spark plug hole and then rerunning the compression test. If the compression rises the piston rings are the cause of the low compression, if the compression stays the same then suspect a burnt valve or blown head gasket as the problem. I hope this helps and please let us know how everything turns out.

Thanks,
Alex
2CarPros
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Friday, March 13th, 2020 AT 2:53 AM
Tiny
COVEMAN
  • MEMBER
All 220 psi and one around 212 does that help?
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Sunday, March 15th, 2020 AT 5:39 PM
Tiny
SCGRANTURISMO
  • CERTIFIED MECHANIC
Hello again,

Well, It confirms that it is not a compression issue. Let's try this and see if we can identify a problem cylinder. Start your vehicle and go and unplug one electrical connector from a fuel injector. Listen to see if the tone of the engine changes. If it does than this is the problem cylinder. If not re-plug the electrical connector back on the fuel injector and move on to the next one. Get back to us with what you find out and we can go from there.

Thanks,
Alex
2CarPros
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Sunday, March 15th, 2020 AT 8:52 PM
Tiny
COVEMAN
  • MEMBER
It runs rougher ever time you unplug an injector. Could they just be dirty?
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Monday, March 16th, 2020 AT 7:13 PM
Tiny
SCGRANTURISMO
  • CERTIFIED MECHANIC
Hello again,

No. If the engine runs rougher when you unplug an injector than that cylinder is okay. Re plug the electrical connector back on the fuel injector and move to the next one. What we are looking for here is when you unplug the electrical connector on a fuel injector and the engine runs the same, no change. This will indicate the problem cylinder. Did any fuel injector not cause the engine to run rougher when it was unplugged?

Thanks,
Alex
2CarPros
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Monday, March 16th, 2020 AT 8:51 PM
Tiny
COVEMAN
  • MEMBER
That is correct it ran rougher for every injector. Then when I plugged it back in it went back to the normal roughness. Then I unplugged the next one and it did the same the idle speed dropped and it then would idle with more vibration that with all four injector hooked up.
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Monday, March 16th, 2020 AT 10:02 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
Let's remove the serpentine belt and look at the harmonic balancer. I think it might have come apart. Also does the clutch work okay?
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Tuesday, March 17th, 2020 AT 10:56 AM
Tiny
COVEMAN
  • MEMBER
I took the belt off and every thing seems fine. The clutch works fine and doesn’t seem to slip but is hard to get into second if the rpm is too high.
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Wednesday, March 18th, 2020 AT 9:15 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
Lets remove the valve cover to see if you have a flat camshaft, this is a strange problem. This is usually a balance shaft problem but this engine does not have them. How did the harmonic balancer look? Also does the engine have okay power?
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Wednesday, March 18th, 2020 AT 10:48 AM
Tiny
COVEMAN
  • MEMBER
The power seems fine. What should I be looking for on the balancer? It does run fine when cold until the rpm goes down to about 1,000 and it just drops to 800 and starts to vibrate. With the temperature at about 1 quarter of the way. And at operating temperature just under half way on the gauge it vibrates the most but still has power. Do you think it is something caused by heat that makes it vibrate when hot? Would a flat cam shaft be worse when hot?
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Thursday, March 19th, 2020 AT 10:34 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
Yes it will, but I asked my buddy who works at the Chevrolet dealer he said these cars have issues with the engine mounts failing apart which can cause the vibration. Here are the instructions for replacement and inspection. Use a flashlight to inspect the harmonic balancer and look for anything shiny, rubber hanging out something like that. Check out the diagrams (below). Please let us know what happens.
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Friday, March 20th, 2020 AT 11:12 AM
Tiny
TOUGHDIVER
  • CERTIFIED MECHANIC
Hi,

It could also be a engine flywheel that has excessive lateral runout, when combined with the extra mass of the clutch pressure plate and clutch driven plate, can produce a disturbance.
The clutch pressure plate and the engine flywheel are marked for proper indexing of the heavy-spot of one to the light-spot of the other. Improper indexing of the pressure plate to the flywheel can produce a disturbance.
An engine flywheel that is loose at the engine crankshaft or that is cracked, damaged and/or missing balance weights; and/or a clutch pressure plate and clutch driven plate that has loose springs, cracks, warpage, damage and/or missing balance weights can produce a disturbance when their mass is combined. I'm attaching flywheel and clutch replacement below. Let us know if you need more information.

https://www.2carpros.com/articles/clutch-symptoms

https://www.2carpros.com/articles/how-to-replace-a-clutch

Thanks
Joe T.

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Friday, March 20th, 2020 AT 1:56 PM

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