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The 3300 is a 90-degree Buick-derived V-6 as opposed to the 3.1 which is a Chevrolet derived 60-degree V-6. The 3300 is a smaller version of the GM 3800 withOUT a balance shaft. That makes them a little more prone to vibration when out of tune. The injection is batch fire, but could possibly have an injector partially clogged.
Yes, dry brittle cracked-through vacuum lines will make it run rough.
It looks like one rubber vaccume line might be different size on each end and possibly pre-formed. Do I need to buy the smaller size and make it fit over the larger fitting or are oem replacements available somewhere? About the pre-formed and pre-bent, guessing this is because if using a normal line it would want to kink from sharp bends. Might have to get a line way longer and make a sweeping loop?
It looks like one rubber vaccume line might be different size on each end and possibly pre-formed. Do I need to buy the smaller size and make it fit over the larger fitting or are oem replacements available somewhere? About the pre-formed and pre-bent, guessing this is because if using a normal line it would want to kink from sharp bends. Might have to get a line way longer and make a sweeping loop?
Go to the parts store and grab the a roll of small and large vacuum tubing and replace all the lines. Elbows also.
I replaced the lines that were cracked, wasn't as many as I thought and most of them looked like they were on a line that goes to the Evap canister. Also took out the MAF sensor and sprayed it with the correct cleaner. It still has a slight miss at idle and cuts out quickly right off idle. Looking at the old plugs I don't think any one stands out on having a issue with that cylinder. Is there a way to test a MAF or would there be a check engine light if it was bad?
05-06-2023, 02:10 PM
