Part throttle shudder while driving at 40mph - Chevy Impala Forums
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post #1 of (permalink) Old 03-08-2019 Thread Starter
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Part throttle shudder while driving at 40mph

2018 Premier, this issue has become more frequent lately and I'm not sure if it's mechanical or fuel quality.

The shudder generally feels like the engine is having a miss fire, yet I see no movement in the tach. It occurs under slight load, going up hill around 35-45mph with the tach reading between 1400 and 1500 RPM. At first I thought it was just rough road, but then it happened on a perfectly smooth road.

It's still under warranty, so I will take it to the dealership, but wanted to see if anyone else has had this happen, before I go there and they look at me like I'm stupid. I just know they will claim they cannot reproduce the problem.

Thanks in advance!
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post #2 of (permalink) Old 06-11-2019
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Iím encountering this same problem.

I noticed itís more apparent when you let the car idle for a while then drive off. I took to the dealer and thereís no codes in the car they can get for diagnostics


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post #3 of (permalink) Old 4 Weeks Ago Thread Starter
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Took mine in for an oil change and had them check on the problem, they did not find anything, no codes etc.. However, since that appointment the problem has gone away. They claimed it was the V4 mode on the engine that I was likely feeling, but why would it go away magically after the visit?
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post #4 of (permalink) Old 4 Weeks Ago
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Quote:
Originally Posted by zanimul View Post
Took mine in for an oil change and had them check on the problem, they did not find anything, no codes etc.. However, since that appointment the problem has gone away. They claimed it was the V4 mode on the engine that I was likely feeling, but why would it go away magically after the visit?
V4 mode? As in active fuel management with shutdown cylinders?

Your car has the 3.6 liter LFX. There's no AFM on that motor.

Not sure what the problem is/was. Back in the day, we'd say maybe you got a bad tank of gas

Doug

.
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Last edited by plano-doug; 4 Weeks Ago at 05:06 PM.
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post #5 of (permalink) Old 4 Weeks Ago Thread Starter
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Originally Posted by plano-doug View Post
V4 mode? As in active fuel management with shutdown cylinders?

Your car has the 3.6 liter LFX. There's no AFM on that motor.

Not sure what the problems is/was. Back in the day, we'd say maybe you got a bad tank of gas

Doug

.

Zakly! I know when they're blowing smoke... I would normally concur on the bad tank of gas, but since it went on for several months, I ruled that theory out.

Jeff
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post #6 of (permalink) Old 3 Weeks Ago
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I'm not doing it for you but if you search the forums I have seen this issue dealt with before. To make it simple there is an unresolved issue with some of these vehicles and 1500rpm's.
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post #7 of (permalink) Old 3 Weeks Ago
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Quote:
Originally Posted by zanimul View Post
2018 Premier, this issue has become more frequent lately and I'm not sure if it's mechanical or fuel quality.

The shudder generally feels like the engine is having a miss fire, yet I see no movement in the tach. It occurs under slight load, going up hill around 35-45mph with the tach reading between 1400 and 1500 RPM. At first I thought it was just rough road, but then it happened on a perfectly smooth road.

It's still under warranty, so I will take it to the dealership, but wanted to see if anyone else has had this happen, before I go there and they look at me like I'm stupid. I just know they will claim they cannot reproduce the problem.

Thanks in advance!
Wished I had some useful information for you but I don't. However, I am not going to be rude to you and tell you to go look it up yourself. I know the search feature on this site can be frustrating if you do not know what exactly to search for, i.e. key words or topics.

Hope you get the answers you are looking for and please post any updates if you figure it out. Afterall, that is one of the reasons many of us are on this forum, to seek knowledge and pass information!



Anything worth doing is worth doing right!

Ed
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