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Pontiac Bonneville General Maintenance and Repair

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#856 of 2228 Oil consumption by jamesgrimm Oct 03, 2002 (3:12 pm)
What is typical for oil consumption for the 3800 V6? I have a 1999 Pontiac Bonneville that I bought with 24,000 miles and it uses about 0.5-0.75 quarts of oil every oil change (3,000 miles). This has been fairly consistent as I have now changed the oil about 3 times. I use the reccomended 10W-30 and I like to use 1 quart of Rislone. There is no leakage and no visible smoke.
#857 of 2228 oil usage by gmlover1 Oct 03, 2002 (4:12 pm)
Just checked oil on my 2000 leSabre at 2800 miles down about .75 qt.. That's about what my 1990 Bonneville with 110000 miles uses.
#858 of 2228 Oil consumption by twobrowns Oct 04, 2002 (2:28 pm)
I have a 2001 ssei with 42000 miles and it uses about .5 qrt. per 3000 miles since new. I would say that your oil consumption is normal.
#859 of 2228 99 Bonneville - Tranny? by jjocjjoc Oct 04, 2002 (2:41 pm)
My 99 has 63k miles on it. Recently we have noticed if you accelerate hard from a stop, you get a nasty "bang, bang" down below like you just ran over railroad tracks. All other accelaration and shifting is fine, and even shifting or accelarating from stop is ok if it's slow and smooth or from a rolling stop. Any clues? I had the transmission recently serviced (flushed) and wondering if that had something to do with it. Any comments? Thanks.
#860 of 2228 Oil consumption by fantascp Oct 04, 2002 (4:29 pm)
I've had my 2000 SE around 2&1/2 years - oil consumption has been consistent- around .75 to 1 full quart every oil change (3000) miles. On my 98 SSE, which I've had since Jan of this year, its a little better- around .50 to .75 max every oil change (3000) miles. Both cars have the normal 3800 Series II (205-HP)   Chuck
#861 of 2228 3.8L EGR/coolant leak/misfire = big bucks repair by flapper10 Oct 07, 2002 (3:46 pm)
Folks, Thanks for the education re: Post# 539,575,614,615,637,645. Thanks to "Alcan" for the personal help. We abused GM owners need to unite and force the issue to resolve these failures. There are plenty of posts re; this 3.8L EGR/coolant leak/misfire issue.   My saga....I recently purchased a ’98 Bonneville SE and drove and performed beautifully the 2 times I test drove.....of course…. then read a few past posting after it started acting up after 60 miles… on "Town Hall" on the intake manifold coolant leaks. My '98 Bonneville suffered from just such a leak as described here and in the TSB. The original upper plenum, intake manifold, 2-5 coil, plug wires, and platinum plugs were replaced by previous owner 2K ago $1300 done by private repair. Prior owner left oil change sticker in window and I was able to find mechanic and spoke directly to the owner/mechanic of the one-man shop. He is a straight up, former, 20 yr experience GM-Buick trained mechanic and followed the "All Data Repair Book" for these symptoms. He gave me the failed parts (plenum and intake manifold)the prior owner saved. He says there is a GM -TSB on the very subject and wonders why GM isn't making good on the design flaw. Car was cherry until 42.5k. Prior owner took car to him exclusively since new in 9/98 for all service. No vehicle service history on Car Fax. Clean title. 1 Owner . MyGMLink.com has no history.....She wrote a complaint letter 3 months ago to GM. I bought Bonneville last week and same drive symptoms described now, ie surging and choppy acceleration, particularly evident in O/D when negotiating even the slightest incline........like when you are running out of fuel w/ fuel injection, here now exist at 44.6 K total miles, are occurring after 600 miles since i bought last week from wholesaler as-is. Do I have another intake manifold leak after only 3K miles or do I have a tranny problem?......such as Alcan said I should also investigate? What is GM doing about these failures?? What can we do as disgruntled GM product owners? What can I expect from a after market warrantee program offered through the credit union???..should the same problem reappear?? Thanks in advance for your cooperation. Rgds........disgusted and concerned
#862 of 2228 by alcan Oct 08, 2002 (2:26 am)
Not sure without driving it if these symptoms are the same as yours, but check Transmission Trauma topic posts 440, 450, 452,453, and especially 460.
#863 of 2228 Philip #842 by montanafan Oct 08, 2002 (6:13 am)
I believe it would be impossible for the intake manifold to fail in 2,000 miles. Although there could be a problem with the repair, but not the part. If your problem was caused by a coolant leak of some sort, you would have a low coolant light. If the problem was an engine misfire ( Ignition/Emissions related), you would have a flashing check engine light. In my area, AAMCO transmisison shops are advertising their expertise in diagnosis of these type problems, you may have them check out the car. If you bought an extended warranty thru your credit union, it will list the parts covered but may not cover diagnosis. You may even want to check with the shop that did the intake repair to see if any warranty for their repair would transfer to you. Good thing you bought the car wholesale with no warranty so you can have the money available to fix what might be wrong.
#865 of 2228 #840 Tranny by jjocjjoc Oct 08, 2002 (6:57 pm)
My problem turned out to be a "pressure control solenoid" replacement. Part was only $48, but labor was $485 at dealer! Service rep mentioned that tech said these can out about every 30-40k miles; didn't think you should have a tranny repair at 30-40k miles. I also saw there is a TSB 00-07-30-002A related to this issue.   Who do we write to complain these re-occuring issues?

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