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Lack of acceleration when the A/C is on

Tiny
CHEVYOWNER10
  • MEMBER
  • 2010 CHEVROLET AVEO
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
I am dealing with lack of acceleration when the A/C is on. I would like to do a couple of tests before determining that the mass air flow sensor is bad.

I just replaced spark plugs and air filter. If someone can send me factory info on how to test resistance in a coil pack assembly for this vehicle I would appreciate it. I also would like to know what the fuel pressure readings would be.

I have the tools to get the job finish. I just need the specs and readings I need to have before determining what is bad.


Thanks
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Monday, July 12th, 2021 AT 3:22 PM

7 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,
Is your check engine light on? Any Codes?

Here is a helpful article on low engine power:

https://www.2carpros.com/articles/symptoms-of-low-engine-power

https://youtu.be/U1RoG3I-Oww

I have attached the ignition coil pack testing procedure as well as replacement instructions.

Fuel Pressure Specification: 380 kPa (Battery Voltage: 13.2V)

Please let me know if you have any questions.

Thank you.
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Tuesday, July 13th, 2021 AT 9:34 AM
Tiny
CHEVYOWNER10
  • MEMBER
  • 93 POSTS
No lights. Just notice the lack of acceleration when I step on the gas pedal with the A/C on. I know there’s a full load on the engine when the A/C is running and it’s a hot day out. But when that happened before it turned out to be the mass air flow sensor and I didn’t have any codes. This time I want to make sure before buying a $60.00 part. So that’s why I asked for fuel pressure reading also.
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Tuesday, July 13th, 2021 AT 10:14 AM
Tiny
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  • MECHANIC
  • 6,383 POSTS
Hello,

Have you tried cleaning the mass air flow sensor? That might help.

https://www.2carpros.com/articles/mass-air-flow-service

If you get a chance to check the fuel pressure, please let me know the outcome.

Let me know if you have any questions.
Thank you.
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Tuesday, July 13th, 2021 AT 10:34 AM
Tiny
CHEVYOWNER10
  • MEMBER
  • 93 POSTS
Yes, I did try cleaning it but it’s so old it probably wouldn’t do anything. I will check fuel pressure and let you know what I got. Thanks for the info. You are a great help with that.
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Tuesday, July 13th, 2021 AT 10:38 AM
Tiny
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  • 6,383 POSTS
You bet. Let me know if anything else I can do to help.
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Tuesday, July 13th, 2021 AT 10:41 AM
Tiny
CHEVYOWNER10
  • MEMBER
  • 93 POSTS
Hi, fuel pressure was good. It checked out at 55 PSI and I spray the mass air flow sensor. That seemed to help. So I’ll keep an eye on it.
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Saturday, July 31st, 2021 AT 5:44 AM
Tiny
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  • MECHANIC
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Your fuel pressure is spot on, which is good.
Let me know if you notice something else, will be happy to assist.
Thanks.
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Saturday, July 31st, 2021 AT 8:51 AM

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