95 Bonneville sputtering, oil pressure dropping. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-24-2007, 08:07 PM   #1
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Default 95 Bonneville sputtering, oil pressure dropping.

I have a 95 Bonneville. Had it for about 2 years and after the first couple months every time I would stop at a red light after it warmed up the oil pressure would drop and the alert thingie would ding. A couple more monthes passed and sometimes it was fine and then others it would act up. Then something flew off one morning and it was smelling really bad so a friend suggests removing the cadililic convertor, and just straight pipe it out the back. So we did and it still acted like crap. Up to this point we have replaced one of the coil packs and wires. Serpintine belt and quite a few hoses. Then today after getting on it a bit it is acting really bad. Every time I hit the brakes and let off it wants to stall and it is losing power and the oil pressure is dropping really low. But as long as I give it gas the oil pressure gauge stays about half way. Please any help would be greatly appreciated.
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Old 11-24-2007, 10:52 PM   #2
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Any smoke coming out of the tail pipe? Have you ever had to fill up on coolant and not seen where it is going? Also, does your oil have a peanut-butter like appearance when you change it? The reason I ask these questions is that there is a known UIM (Upper Intake Manifold) failure in the Series II motors, and it certainly would act horribly if it was taking on coolant, of course there are many things that can do that, but I'd just like to diagnose the heavily known issues first and get them out of the way, hopefully a moderator or gearhead will step in with some more advice, and correct me if I'm wrong, but either way, doesn't hurt to diagnose and make sure you don't have a UIM failure coming....
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Old 11-25-2007, 12:19 AM   #3
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Also wondering how many miles are on the car

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Old 11-25-2007, 05:56 PM   #4
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Default milage

about 200,000
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Old 11-25-2007, 06:09 PM   #5
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And for how many miles have you owned the car/mileage when purchased.
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Old 11-25-2007, 06:23 PM   #6
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This is what happened to mine... Way way before 200k... This happened the last week of september... 1000 miles from home..

If you listen you hear the Rod bearing chatter and then it'll start squeaking... Was a hard start too.. That bearing was not doing good.. Oil pressure was bottoming out as well...


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Old 11-25-2007, 06:35 PM   #7
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Default no squeaking

No squeaking for me just the knock/clicking nioise in between 1st and second. Was a hard start though. Ive put about 50, 000 miles on it myself. Also the oil pressure is fine as long as I am giving it gas. And there was a little water above the radiator panel where your radiator cap goes.
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Old 11-25-2007, 07:11 PM   #8
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That hard start tells me the Bottom end is most likely toast.. Know anyone that does motor removal and install?

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Old 11-25-2007, 07:50 PM   #9
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Default bottom end

What exactly is a bottom end? How much would repair be?
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Old 11-25-2007, 08:06 PM   #10
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This is what we refer to as a bottom end.. This would be my motor On the back of my friends truck.. If you look you'll see the 8 Bolts.... This would consist of the Main bearing caps and crankshaft as well as connecting rods.. That would be the bottom end..






In this pic, on the lower left you'll see a bolt, The bolt is holding the rod bearing cap, To the right you'll see the Crank journal is not smooth, the bearing spun and ate up the metal of the crank



The Journal should look like this





This would be a bad rod bearing



This one is a little better but not healthy..




When the bearings wear like this it can cause the motor to tighten up, and also cause the oil pressure to drop... That would be a Bottom end.. And it sounds like yours is done..

I always say it would be easier if I could take a look at it.. But from what you have described, it doesn't sound good..

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