So I've got 2 throttle bodies (LSJ) that won't let the car go into decel. After reading a post recently I determined it was from spraying tb cleaner straight into the tb that caused this problem. My question is can I repair or recalibrate them in anyway to avoid having to buy another one?

 

Did you push it open with your hand when you cleaned them??? Cuz if you did, then yes, you will need a new one

 

No and I've moved the blade by hand before without damaging it. I'm talking about just the spray of the cleaner causing the problem. I read that spraying the cleaner in the tb can damage the throttle position sensor.

 

Bump

 

Bump anyone?

 

i sprayed mine heavily when i cleaned it. Seems fine

You sure its not another issue?

 

Didn't start until after I cleaned both of them and I already checked with Vince to make sure it wasn't in the tune. I read in the thread below about spraying it in the throttle body causing issues.

https://www.cobaltss.net/forums/prob...e-body-281134/

Didn't start until after I cleaned both of them and I already checked with Vince to make sure it wasn't in the tune. I read in the thread below about spraying it in the throttle body causing issues.

https://www.cobaltss.net/forums/prob...e-body-281134/

 

Strange. Were they unplugged?

 

Yep and weirder that they work fine except for going into decel. Both of them seem to flutter open just a little bit a couple times when I let off the gas before they finally close and the car settles into decel. I can feel the car surge a little bit and also watch my wideband bounce around like crazy.

 

There is a warning somewhere (I'm on my phone so sorry i can't find it) saying that you can damage your throttle body by opening it by hand, and the only way to fix it is to replace it, i cleaned mine the same way as you did yours, and have had no problems, so maybe you just got unlucky? Just relaying info

 

I've read that many times as well and I made sure not to do that but still something got messed up. Honestly in that link I posted was the first time I read about not spraying cleaner directly into it so I don't know if it's really true which is why I started this thread to get some more info.

 

Well changed my throttle body again, this time with a brand new one and still having the issues with decel. This is really irritating me because I don't know what's causing the issue. I'm gonna check the wiring to make sure they are all making good connection where I rewired. The only other thing I can think of is the tune but this never started until the first time I cleaned my throttle body. I can take a video later if anyone wants to see what is actually going on.

 

Yea take a video, maybe something in the tune if its what I'm thinking.

 

Here's a video of my wideband reading when I let off the gas. I let off right at the beginning and about 8 seconds in it finally settles into decel. At 10 seconds I blip the throttle again and it does its bouncing act again before finally settling down towards the end. I've also recently started getting the p1682 code. Not all the time just maybe once out of every 10 times I start the car.

Chevy Cobalt Decel - YouTube

 

Do the rpms or boost bounce with it?

 

Just flutter very slightly if any. I can feel the car lurch/surge when it happens too, kinda like when you have the cruise control set going down a hill and the car jerks some trying to maintain its speed.

 

That's weird. I'm not completely sure what it is but it couldn't hurt to check some things. You may be able to check through the tune: torque management or fuel trims. Could it be a loose connection or a misconnection in the 6 to 8 pin throttle body adapter?

 

Checked all my wiring to make sure it was correct and it all matched up right. Had one loose connection that I redid but still had the same issue when I took it for a drive. Vince says it's not in the tune but I don't know what else to check. Checked and cleaned the MAP and MAF, no vacuum or boost leaks that I know of. I was positive that a new throttle body would solve it, but nope. On the plus side, I guess I have 2 throttle bodies for sale since they weren't the issue.

 

Sorry to revive an old thread, but was the issue ever solved? I have the same issue occasionally..