Series of issues with my Sonic

[stoopid]

In all seriousness, the tune for the turbo has such large gains that I'd be saving every penny for it if that's what it took.

 

[Sonicpizza]

Shaking after slowing down at light

I have a 2013 LT 1.8 auto, and i've noticed when i stop at a light after a few seconds the engine with shake. Its not that bad but it'll do it for a few seconds then gradually fade off. I took the guy from the dealer for a ride to show him, and of course it doesnt do it! Anybody else had this problem!?

 

[sbpphoenix]

Thats normal.

Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

 

[illsonic]

the shaking you feel while sitting with your foot on the brakes is the transmission , there is a tsb for this issue it has to do with the clutches in the transmission the transmision has to be removed and new clutches installed

 

[firedoghfd]

the shaking you feel while sitting with your foot on the brakes is the transmission , there is a tsb for this issue it has to do with the clutches in the transmission the transmision has to be removed and new clutches installed

Do you have the TSB? Can you post it?

 

[Sonicpizza]

New clutches!? It started at around 4000 miles, and i need new clutches allready!?

 

[ChrisJ]

New clutches!? It started at around 4000 miles, and i need new clutches allready!?

They changed the design of the clutches, obviously.

 

[ramiro77]

Mine does the same thing when I stop at a red light in neutral. But I have MT, not AT. So how could it be clutch responsible for this?

 

[ChrisJ]

Mine does the same thing when I stop at a red light in neutral. But I have MT, not AT. So how could it be clutch responsible for this?

It could if it wasn't releasing fully.

But I think its safe to assume you have a different problem. Check your plug gap on all 4 spark plugs?

 

[ramiro77]

Thanks, I will!
For the record, if I´m going at 1mph, nothing happens. But suddenly RPMs go down to 400 when speedometer reaches 0mph. And after one second, RPMs goes up to 500 and engine stop shaking. This happens sometimes, not everytime I stop to 0mph. And sometimes RPM starts going between 400 and 500, needing to hit the gas pedal to stop it. Looks like same problem posted by Sonicpizza

 

[Sonicpizza]

Thanks, I will!
For the record, if I´m going at 1mph, nothing happens. But suddenly RPMs go down to 400 when speedometer reaches 0mph. And after one second, RPMs goes up to 500 and engine stop shaking. This happens sometimes, not everytime I stop to 0mph. And sometimes RPM starts going between 400 and 500, needing to hit the gas pedal to stop it. Looks like same problem posted by Sonicpizza

Mines auto, but the rpms stays the same.

 

[ramiro77]

If your engine was shaking, then surely RPMs was going down. I can´t see how an engine can shake by itself with constant RPMs unless there aren´t any motor mounts.
That´s why I assumed your problem was similar to mine. But maybe isn´t.

 

[Sonicpizza]

No rpm movement, no noise just the shaking. Its weird, i make sure to watch the rpms when it starts shaking.

 

[ramiro77]

Yes man, that´s really weird.
Pay attention on the RPM gauge. If the engine is 100rpm down than it should, it will start shaking a lot. I have that RPM drop in my car (difference between 500rpm and 400rpm). Also I think this RPM range is too low for a not-diesel engine.

 

[ChrisJ]

Yes man, that´s really weird.
Pay attention on the RPM gauge. If the engine is 100rpm down than it should, it will start shaking a lot. I have that RPM drop in my car (difference between 500rpm and 400rpm). Also I think this RPM range is too low for a not-diesel engine.

Ford model A 4 cyl idles at 300-400rpm fine. But that is due to a heavy flywheel.
I think my Sonic idles at 750 according to the stock tach? 400-500 seems WAY too low. I just realized this is in the 1.8 section, but I thought my 1.8 also idled around 750?

 

[Sonicpizza]

Yes man, that´s really weird.
Pay attention on the RPM gauge. If the engine is 100rpm down than it should, it will start shaking a lot. I have that RPM drop in my car (difference between 500rpm and 400rpm). Also I think this RPM range is too low for a not-diesel engine.

I agree with it being a low idle. And whats up with the 3k rev limiter

 

[ChrisJ]

I agree with it being a low idle. And whats up with the 3k rev limiter

3k rev limiter? Sounds like a neutral thing.

 

[Sonicpizza]

3k rev limiter? Sounds like a neutral thing.

How do you mean?

 

[ChrisJ]

How do you mean?

I have no clue but to me it would make sense for the car to limit revs to 3K when transmission is in neutral. When in drive it would be something more normal like 6500-7000.

I think my ATVs have different settings for neutral than in gear on the rev limiters also.

 

[Sonicpizza]

I have no clue but to me it would make sense for the car to limit revs to 3K when transmission is in neutral. When in drive it would be something more normal like 6500-7000.

I think my ATVs have different settings for neutral than in gear on the rev limiters also.

My car is auto and it only goes to 3k in park and neutral