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Wrong throttle body gasket?


acklac7

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Ok I checked out the fuel injectors...they seem to be fine, at least the spray pattern looked ok....So I went to put the throttle body back on and noticed the gasket would not fit. After looking at it for a few minutes I came to the conclusion that it is likely the WRONG gasket. It doesn't appear to be warped or streched just appears to be the wrong size. As you can see in the pictures it just won't fit. Upon further inspection I noticed that there is a 1.5 inch section that is really chewed up, so I positioned the gasket so that this end would section would stick out (pic 2)....the serrations stop exactly where the gasket goes into the groove. I would assume that the gasket not being seated correctly is going to cause a vacuum problem right? (or some type of intake problem)....Probably going to go the dealership on Tuesday, hope they have the correct one in stock...Until then she'll just have to sit.

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A.J.

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Ok I checked out the fuel injectors...they seem to be fine, at least the spray pattern looked ok....So I went to put the throttle body back on and noticed the gasket would not fit. After looking at it for a few minutes I came to the conclusion that it is likely the WRONG gasket. It doesn't appear to be warped or streched just appears to be the wrong size. As you can see in the pictures it just won't fit. Upon further inspection I noticed that there is a 1.5 inch section that is really chewed up, so I positioned the gasket so that this end would section would stick out (pic 2)....the serrations stop exactly where the gasket goes into the groove. I would assume that the gasket not being seated correctly is going to cause a vacuum problem right? (or some type of intake problem)....Probably going to go the dealership on Tuesday, hope they have the correct one in stock...Until then she'll just have to sit.

I would cut off the extra portion and put it in.

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My memory tells me that someone ran into this problem before. Rubber swells from contact with oil and grease and its possible that is what happened here. I did a search and couldn't find anything

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GEt the right throttle body gasket. If you cut the excess off that one and install it you will have an air leak and the engine won't idle properly.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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I would get a new one too, but in the mean time I would bet if you are careful and cut it just right you could fit it together with RTV, let it set overnight and it just might last forever.

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Yeah I'm probably going to just buy a new one. There aren't any signs that it expanded, just looks like the wrong size. In the Svc. Manual it notes to pay close attention to the part # on the throttle body when ordering parts...seems like there may be several different makes/variations of the throttle body?

This might sound stupid, but should I expect any difference in performance with the correct gasket? Or was this gasket likely doing a fair job?

A.J.

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The O ring is correct...

You cannot reuse a O ring...

As mentioned....they swell over time...and are imposible to reuse.

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This might sound stupid, but should I expect any difference in performance with the correct gasket? Or was this gasket likely doing a fair job?

No, you should not expect any difference in performance. That "O" ring was likely performing as required while clamped in place. It expaneded after it was released.

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I see this in my job all the time. Usually the o rings swell from exposure to gasoline containing MTBE and will not be able to be forced back into the groove once they are removed from "service position". You have a few choices, but the best one is to get a new O ring. The other (next best) one is to cut a section of the o ring out using a new razor blade. This would be a 45 degree angled cut on the "cross section" of the material, so that the assemby forces act to hold the splice together. Using SUPER GLUE to fasten the ends together. The static seal application is very forgiving to this method, and will last a very long time.

Never underestimate the amount of a persons greed.

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Thanks....I ended up just replacing the O-ring...Thought about cutting it but decided to err on the safe side and just replace it....thanks for the help guys

A.J.

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