# Chevrolet lacetti engine fluctuating

**URL:** <https://community.cartalk.com/t/chevrolet-lacetti-engine-fluctuating/169883>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet\
**Created:** [September 13, 2020, 9:32am UTC](https://community.cartalk.com/t/chevrolet-lacetti-engine-fluctuating/169883 "2020-09-13T09:32:17Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Andreas-15](https://avatars.discourse-cdn.com/v4/letter/a/9dc877/32.png) [@Andreas-15](https://community.cartalk.com/u/Andreas-15)\
**Post date:** [September 13, 2020, 9:32am UTC](https://community.cartalk.com/t/chevrolet-lacetti-engine-fluctuating/169883/1 "2020-09-13T09:32:17Z")

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Hello guys. I have a chevrolet lacetti which is fluctuating rpm very strangely and very high at idle and low speeds. The problem happened after a head gasket replacement. The car has new head gasket. Egr. Crankshaft sensor. Camshaft sensor. Spark plugs. Spark plug wires. Spark plug coil. New gaskets almost everywhere. I tried to find a vacuum leak but nothing. When i connect the code reader it doesn’t find any trouble codes. I did notice though that when i accelerate in neutral that my maf sensor is showing the pressure dropping instead of increasing. I disconnected the maf sensor and the car almost runs normal. It does jerk a bit on low speeds but i am assuming is because it doesn’t have the maf sensor connected. Any ideas what it could be?. Is it a maf sensor faulty? It wasn’t before the head gasket replacement.

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**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\
**Post date:** [September 13, 2020, 10:02am UTC](https://community.cartalk.com/t/chevrolet-lacetti-engine-fluctuating/169883/2 "2020-09-13T10:02:21Z")

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> [@My lacetti revs up in a strange way](https://community.cartalk.com/t/my-lacetti-revs-up-in-a-strange-way/169746/15):
>
> Any ideas ?.

Yes  
Stay with your original thread, starting a 2nd thread is not a good way to get help.

> [@My lacetti revs up in a strange way](https://community.cartalk.com/t/my-lacetti-revs-up-in-a-strange-way/169746/11):
>
> I made a test with the maf sensor. While the car is at idle the manifold pressure that the sensor is reading was 50kpa and when i open the throttle the pressure dropped to 20 kpa almost.

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [September 13, 2020, 11:30am UTC](https://community.cartalk.com/t/chevrolet-lacetti-engine-fluctuating/169883/3 "2020-09-13T11:30:20Z")

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@cdaquila  
Carolyn: Can you merge the OP’s new thread with his original–identical–thread?

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**Author:** ![cdaquila](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cdaquila/32/18089_2.png) [@cdaquila](https://community.cartalk.com/u/cdaquila)\
**Post date:** [September 13, 2020, 12:33pm UTC](https://community.cartalk.com/t/chevrolet-lacetti-engine-fluctuating/169883/4 "2020-09-13T12:33:44Z")

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A post was merged into an existing topic: [My lacetti revs up in a strange way](https://community.cartalk.com/t/my-lacetti-revs-up-in-a-strange-way/169746)

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**Author:** ![cdaquila](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cdaquila/32/18089_2.png) [@cdaquila](https://community.cartalk.com/u/cdaquila)\
**Post date:** [September 13, 2020, 12:34pm UTC](https://community.cartalk.com/t/chevrolet-lacetti-engine-fluctuating/169883/5 "2020-09-13T12:34:00Z")

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