OT 2008 Impala troubles

super99

Well-known Member
Our car crapped out in Canton, Mo, we live 2+ hours north. She made it to the Napa store there and a mechanic hooked it to the computer and told her that the butterfly in the throttle body was only opening 27%. Our daughter drove up from Hannibal and brot her part way and I met them and picked her up and we came home. I'll borrow a trailer tomorrow and go haul it home. The mechanic explained to me that the throttle body is computer controlled and most likely needs a control module on the throttle body. Seeing as how tomorrow is Thursday before a long weekend, is this a part that I can just replace or are special tools and hooking up to the computer required? In other words, can an old shade tree mechanic replace the module and fix it or is it more complicated than that??? Thanks, Chris
 
Throttle body issues won't cause a stall while running down the road, if that is what happened. They can cause it to idle down, though, but there will be codes and should run right after a key cycle. Need more specific info. If the engine is not running, the throttle won't open more than about 25%. There are lots of parameters that control when and how far the throttle will open. I would guess the mechanic has not dealt with one of these systems. While easy to put on, I would not be throwing a throttle body at it without more diag, they aren't cheap. Even with the throttle body disconnected, it should run at a high idle. If it won't run at all, the throttle body is not the problem.
 
This may not apply to your car. But my wife's 2003 Impala suddenly crapped out under similar circumstances yesterday afternoon.

It would restart, but then would run roughly for just a couple seconds before quitting again. The "check engine" light did not come on. And sticking an OBD scanner on it showed NO active (nor pending) trouble codes. WTF???

A quick online search suggested a failed mass air flow sensor. The test/temporary fix is to simply remove the connector from the MAF sensor. When I did that the car started and actually ran pretty well. But now the "check engine" light was now lit and the OBD scanner showed a MAF sensor fault code - expected due to the disconnected wiring.

This morning replacing the old MAF sensor with a new one has the car once again running fine. The upside is R&R-ing the MAF sensor is about a 2 minute job. The downside is the new sensor cost me about $130. But my wife is once again happy.
 
With all the electronics on the new cars bring it home and find somebody that knows what their doing to fix it. You can spend a lot of money throwing this and that into it with out knowing what is really wrong with it.
 
We had a similar thing on our 2010 Chevvy, turned out to be the gas pedal, believe it or not. Which is hooked up electronically to the throttle body somehow. Don't understand, but got it replaced and it was fixed.
 
(quoted from post at 09:01:41 05/26/16) We had a similar thing on our 2010 Chevvy, turned out to be the gas pedal, believe it or not. Which is hooked up electronically to the throttle body somehow. Don't understand, but got it replaced and it was fixed.

There is a rheostat device on the gas pedal, and a similar device on the throttle body. The 2 are connected by very small wires.
 
That is simply WRONG!!! The two have NO DIRECT CONNECTION.

Here is how it works:

The gas pedal is simply a variable resistor - also known as a rheostat. The main computer "reads" the signal from the gas pedal and operates the throttle body accordingly. There are also inputs from other engine sensors that are calculated into the mix to determine the CORRECT throttle opening.

Imagine: A $3.95 throttle cable has been replaced by several thousand dollars' worth of electronics. Wonder why a new compact costs over $30,000???
 

"control module on the throttle body"

WTF is dat... I have a ID just wanted to know your thoughts...

Its hard to make a WAG with out the codes (all the codes) about all I can add is I do not replace throttle body parts are any Throttle parts with aftermarket parts BTDT got the t-shirt... it gets a new OEM parts and a complete OEM throttle body at that if you just replace TB parts you are asking for trouble...

They also sell the connectors I wounder why :shock: I found out why if I replace the TB are your Module I also wire in a new connector it sure nuff eliminates a comeback... :D

If it comes back you get to chase down all those ground locations its a chebby thang to ensure you loose your arse just for being are the right place at the wrong time...

If it has a transmission code stored along with a throttle code which code do you go after first... If you guessed transmission code got the the front of the class...
 

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