Engine shutters at 1700-2000 RPM

[Identity Crisis]

96 3.4DOHC Auto

 

When just light peddling the throttle and the car hits 1700RPM it starts to shutter and then when it goes over 2000 RPM it goes away.

 

I have changed the plugs and wires and all of the upper intake, intake tube and throttle body gaskets, PCV, air filter, oil changes etc and nothing helps it.

 

There is a listing in my snap on scanner for this issue but there is not explaination.

 

Does anyone have a clear idea of what the hell is going on?

[RareGMFan]

I don't know if there is something else that the LQ1 is prone to that may be causing your issue, but I know I've had several cars shutter pretty badly at certain RPM when a coil or 2 was toast. The ones on my TGP literally had cracked casings that were arcing like crazy, to the point that they would make the motor shutter if I pressed any harder than 1/4 of the way down on the accelerator.

[Identity Crisis]

I replaced the coils at the same time I did the wires.

[89SupremeCutty]

when this happens are you in gear or idling in park/neutral?

[Night Fury]

Mine does the same freaking thing, except it's a 3.1

[BXX]

bah, not again..

 

 

change your transmisssion fluid

[Night Fury]

bah, not again..

 

 

change your transmission fluid

 

Me? Its brand new fluid and completely full.

[Identity Crisis]

This happens while driving only. And the trans fluid was changed 5000kms ago.

[BXX]

Shuddering with no signs of an engine misfire is 99% of the time transmission fluid or transmisson torque convertor/internal issues.

[Identity Crisis]

I thought this shuttering was a common issue with these cars?

[1990lumina]

Either that or maybe you have a worn out mount or two. My Lumina used to shudder with the worn out lower mount when the fluid leaked out of it

[89SupremeCutty]

Shuddering with no signs of an engine misfire is 99% of the time transmission fluid or transmisson torque convertor/internal issues.

 

i was thinking tcc. try unplugging it from the outside of the trans and drive it and see if that does it.

[BXX]

Either that or maybe you have a worn out mount or two. My Lumina used to shudder with the worn out lower mount when the fluid leaked out of it

 

 

That wont cause a shudder on its own... Trust me, I have every mount pretty much blown on my CS with no shuddering whatsoever...

 

Now that I remember, I never had a W with good mounts

[Identity Crisis]

TCC? I will give that a try this week.

 

Is it on the Drivers side?

[Captain Ficho]

Either that or maybe you have a worn out mount or two. My Lumina used to shudder with the worn out lower mount when the fluid leaked out of it

 

 

That wont cause a shudder on its own... Trust me, I have every mount pretty much blown on my CS with no shuddering whatsoever...

 

Now that I remember, I never had a W with good mounts

 

Seconded... all my mounts were shot and I never had any shuddering. But I finally got around to changing them last week.

 

I'd be be inclined to believe it is a trans problem as well.

[Brian P]

look at the ignition coils in the dark and check for arcing between the terminals. Spray some water mist around there too, that might help it show up.

[Identity Crisis]

I just changed the coils this DEC and it was doing this before and after.

[89SupremeCutty]

sound slike the tcc to me. it's located on the drivers side on the front of the trans closest to the radiator. if im wrong someone correct me. i remember on my cutty that's where it was.