Knocking when turbo is redlined
- Thread starter tbanks3
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gs462
Active Member
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- May 18, 2003
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- 1,275
Stop doing it till you can get the car tuned, it's detonation and you will wind up replacing headgaskets, if you keep doing it. Also run the highest octane gas you can find, Do you have a boost gauge?
DailyDrifter
The Slow and the Curious
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- Dec 5, 2007
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- 5,118
come on guys ... HAMMER that baby!!! then when it goes "KABOOM" you can see what happened and fix it"Search" feature is your friend
Great advice there.
Thanks a lot for the help folks. In reply to a few of you: The car is all original, 82,000 miles, original turbo, (has a cat converter), and I do not boost gauge yet. Based on reading the posts it sounds as though the best place to start is getting her tuned up properly. I drove the car today to make sure I do not hear it at any other time and I didnt. Definitely only when floored. Also, the previous owner has the idle set pretty high on this thing. I asked him about that and he said it would stall out sometime when it was lower?? Thanks again for the help guys, Im happy there are knowledgeable people in regard to this type of car.
Start with 1/2 throttle blasts until you can address the detonation. These cars love/need octane.
Is the rod on the little canister below the turbo threaded? If it is, then it's an adjustable wastegate. The previous owner may have had the boost turned up without supporting modifications.
Read, read, read. Best advice I can give. We are here to help.
Is the rod on the little canister below the turbo threaded? If it is, then it's an adjustable wastegate. The previous owner may have had the boost turned up without supporting modifications.
Read, read, read. Best advice I can give. We are here to help.
Where are you located? Most of us have no problem whatsoever (although may require a 6-pack of oat soda) coming out to help a Buick brother.
The IAC needs to be reset to fix the idle issue. http://www.gnttype.org/techarea/faq/IACreset.html
The IAC needs to be reset to fix the idle issue. http://www.gnttype.org/techarea/faq/IACreset.html
Check your wastegate hoses for incorrect hookup and integrity as well as the wastegate diaphragm. Probably hooked up wrong or full of holes since it is probably over 20 years old now. If you disconnect the wastegate solenoid it should only go to about 10psi. It will throw a code but its no big deal since you are trying to isolate the overboost situation. It should be 13.5-14psi in 1st-3rd and 10psi in 4th if the stock chip is in it and the wastegate is in good shape.
gs462
Active Member
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- May 18, 2003
- Messages
- 1,275
Where are you from maybe someone here is close and can help point u in the right direction.
Hey guys, sorry for the delayed response. I took a look today at the parts around the turbo (turbos are new to me) and I looked for the rod under the turbo. It did not appear to be threaded. I did find a small hose disconnected from the turbo setup. It appeared to be a vacuum line (not sure) that ran from the turbo setup towards the block to a junction of vacuum lines. It was on the right side of the setup near a larger metal tube that runs to the intercooler. I hooked it back up, but have not been able to see if that had any impact on the problem as the weather is not so good.
To answer the question regarding where I am located; I am located in Central Virginia and can certainly set aside a few bucks for some oat soda and I always have some Yeungling on hand! Thanks again for your knowledge and replies.
To answer the question regarding where I am located; I am located in Central Virginia and can certainly set aside a few bucks for some oat soda and I always have some Yeungling on hand! Thanks again for your knowledge and replies.
Ok after searching around a bit on the forum I found a picture that looks similar to the rod on my GN. Here is the link to the thread. The picture is a little ways down the page. According to one of the members it is adjustable.
http://www.turbobuick.com/forums/engine-tech/262490-boost-stuck-12-pounds.html
http://www.turbobuick.com/forums/engine-tech/262490-boost-stuck-12-pounds.html
tbanks3;2128273I did find a small hose disconnected from the turbo setup. It appeared to be a vacuum line (not sure) that ran from the turbo setup towards the block to a junction of vacuum lines. It was on the right side of the setup near a larger metal tube that runs to the intercooler.[/QUOTE said:
