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My Car Engine is Shaking. It is a Chevrolet Spark. :-/

Customer Question
My Car Engine is...

My Car Engine is Shaking. It is a Chevrolet Spark. :-/

Mechanic's Assistant: How many miles are on the car? Is it an automatic or a manual transmission?

Manual Transmission. About 60 000 miles.

Mechanic's Assistant: Are you fixing your Spark yourself? What have you tried so far?

Replaced spark plugs and fuel pump. I am doing it myself

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

The Shaking is noisy. At first was accelerating and deceleratino itself. But after cleaning some sensors the movement got better.

Submitted: 9 months ago.Category: Chevy
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Answered in 29 minutes by:
9/15/2017
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago
Gary
Gary, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1,811
Experience: Senior Technician
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Hello! My name is Gary.
Welcome to JustAnswer.
I'm reviewing your question now, and will post back with a reply shortly.

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Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

Hello there,

What year is your Spark?

Sounds like the engine has a misfire.

Can you get a scan for codes please?

Gary

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Customer reply replied 9 months ago
Hello
Customer reply replied 9 months ago
I have sent a print of the scan
Customer reply replied 9 months ago
Too many codes. However, THIS WAS BEFORE CHANGING PLUGS AND FUEL PUMP.
Same behaviour.All plugs looked firing fine.
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

Wow, I've never seen a Spark with that many engine codes.

Have you done a compression test and a leakdown test?

Timing belt has been replaced?

Has the car been in an accident recently?

Gary

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Customer reply replied 9 months ago
None of those tests done
Customer reply replied 9 months ago
No Accident. But the engine was heating
Customer reply replied 9 months ago
Vacuum is not leaking.
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

Are you saying the engine is overheating?

You need to check some mechanical to eliminate what is good.

In other words, valve timing is correct, compressions are even etc.

Gary

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Customer reply replied 9 months ago
No longer heating. Temperature is fine now. All mechanics are good. It should be something related to Fuel, Spark and air.
As is mentioned car was accelerating and decelerating itself, loosing and gaining power by itself when running. But after cleaning some sensors, the speed is normal
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

I would be checking all the engine ground points in the engine bay.

Holden and Chevy are known for poor earthing nuts and studs.

Has the engine been washed recently?

Gary

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Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

Hello again,

Do you need any further help?

I hope my advice has been of assistance to you.

Kind regards

Gary

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Customer reply replied 9 months ago
I might need further Help. For now I am double checking everything. And will come back to you afterwards
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

Ok, I'll be here.

Can you disconnect the ecm and check the connectors for moisture please.

Gary

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Customer reply replied 9 months ago
I will check that, thank you
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

Ok, hear from you soon.

Gary

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Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

Can you attach your new codes please?

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Customer reply replied 9 months ago
I just did
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

I can see your original screenshot of codes entered twice on the 15th, but I don't see anything this time.

Can you upload to here your latest code list again please?

Gary

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Customer reply replied 9 months ago
Hope you can see it now
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

Yes, I can see that now.

I'll see if I can get an ECM circuit for you.

Gary

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Customer reply replied 9 months ago
The Codes suggest The ECM should be repaired?
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

If you erase them, do they all come up at the same time?

I would think a common ground wire is at fault before the ECM.

Finding a circuit is a little hard at the moment.

Gary

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Customer reply replied 9 months ago
They came up at the same time after erasing everything
Customer reply replied 9 months ago
I will check again the grounding
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

You could have a broken common wire within the loom.

But check all the grounds first.

Gary

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Customer reply replied 9 months ago
I checked the ground. Nothing relevant found.
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

I think you need to take it to a Chevy dealer.

Half of those codes could be fictitious readings from your non GM reader.

You are not using a factory diagnosis tool, and being steered in the wrong direction.

Gary

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Customer reply replied 9 months ago
I will keep working on the loom
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

I would also get a scan from another device, preferably a GM scan tool, to see if the codes are the same as you have now.

Gary

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Customer reply replied 9 months ago
Ok. I will work on that. I will come back to you later on.
Sorry for taking along time
Chevy Mechanic: Gary, ASE Certified Technician replied 9 months ago

That's ok, I'm sorry we haven't got a fix as yet.

I'll leave it with you.

Gary

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Customer reply replied 8 months ago
Well, I took it to a Chevy Dealer and I gave your recommendations. Will take about a week to get it back :-)
Customer reply replied 8 months ago
Thank you
Chevy Mechanic: Gary, ASE Certified Technician replied 8 months ago

I hope the dealer can sort it for you.

All the best to you.

Gary

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