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jwbouch

Cleaning the Throttle Body?

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This is in reference to my 2004 Grand Prix with the 3800 series III. This issue with stalling on start up seems to be pretty typical of the vehicle.

I've been reading anything I can find on my Grand Prix starting issues, and I have read many other people who have had this issue and they say to clean the throttle body, because of the sensitivity to build up by the "drive by wire" throttle system. Anyone ever hear of this, or have any good ideas on how to go about cleaning the throttle body? I haven't had the time to check into anything else yet, such as testing the pressure in the fuel system, because I don't have a tool to do that with. Plus, I don't know nearly as much as I would like to! I am going to try to figure this problem out this week/weekend, because it is getting annoying! Thanks for the input.

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My method of cleaning the TB on my 2.2L Saturn once was to have an assistant floor the gas pedal with the key on, engine off, opening the throttle plate all the way. I then just wiped it all down with some spray TB cleaner and a clean shop rag.

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My method of cleaning the TB on my 2.2L Saturn once was to have an assistant floor the gas pedal with the key on, engine off, opening the throttle plate all the way. I then just wiped it all down with some spray TB cleaner and a clean shop rag.

Thanks for the advice! This is my project for tomorrow. With a throttle by wire system, would someone actually have to hold the gas pedal down? Or would it not really matter, since it isn't a mechanical system? I generally make my brother help me work on my car, but he lives in Ohio, and I"m in Jersey. He is the mechanically inclined one in the family!

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I haven't had issues with the TB on the 2004 Grand Prix, but its supercharged.

On my '99 Bonne, I did have issues, to the point where the the butterfly would get sticky. I cleaned it from the outside, but it got sticky again. I took the TB off, and it turned out the goo was on the inside, from the PVC. At that point, I totally cleaned it with TB spray and it was fine up to the point that I redid my upper intake and at that point I put a hogged out TB on the car.

As for the starting problem, are you getting any codes?

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On many cars it's a piece of cake to remove the throttlebody completely and clean it thoroughly, giving you much longer intervals between cleanings. It can also help things like idle air control valves not get gummed up (again, depending on the throttlebody design.)

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I haven't had issues with the TB on the 2004 Grand Prix, but its supercharged.

On my '99 Bonne, I did have issues, to the point where the the butterfly would get sticky. I cleaned it from the outside, but it got sticky again. I took the TB off, and it turned out the goo was on the inside, from the PVC. At that point, I totally cleaned it with TB spray and it was fine up to the point that I redid my upper intake and at that point I put a hogged out TB on the car.

As for the starting problem, are you getting any codes?

I have no indicator lights on on the dash board. I would assume this means no codes were thrown?

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I have no indicator lights on on the dash board. I would assume this means no codes were thrown?

As long as you don't have any bulbs out, no dash "check engine" or other "service" lights = no codes.

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Well, that job wasn't very difficult at all. Now I just have to see if that solves the problem. I have my fingers crossed!

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