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Pontiac Bonneville General Maintenance and Repair

2228 messages,  Last post on Nov 29, 2009 at 4:40 PM

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#678 of 2228 95 Bonny Probs by bonnevilleman Mar 14, 2002 (8:24 am)
I have a 1995 Pontiac Bonneville SSEi that I purchased used. It was always my dream car so I had to have it. Well within my 1 year of ownership I have had NUMEROUS problems with it.   1. when idling the engine runs VERY rough and when you first start the car, revs to 2500 rpms and then idles down and dies. Start it again and it will stay running but very very rough. After a few minutes of idling either at a stop light or just sitting in the driveway the CHECK ENGINE light will come on. I have taken it to the dealer and they say it is giving a "Lean Code" which means the O2 sensor and fuel filter need replacing. I have replaced each of these twice but to no avale. What could be wrong?   2. While into the dealer for the above mentioned problem they said the transmission was giving a code that the TCC Sylenoid was out. What is it and what does that mean? Is it something I should be worried about?   3. Last but not least when I start the car there is a distinct rattle coming from the left front. after you have driven for a little ways it stops but it bothers me. Any suggestions?   If anyone can help me with these problems, it would be greatly appreciated.   Preston
#679 of 2228 TCC by mfahey1 Mar 14, 2002 (12:49 pm)
Can't help you with #1 and #3. The TCC is the torque converter clutch which locks up about 45mph. After the car shifts into 4th and you keep accelerating, you'll hear the engine rpm drop about 45 which is the converter clutch locking up for better fuel economy and less heat being generated in the transmissionl. When it fails, it usually fails "locked up" which means when you come to a stop, the engine is still locked to the transmission and will die. So, if it is going out, you will have to replace it unless of course, it is failing to lock up in which case you could probably ignore it.
#680 of 2228 bonnevilleman by alcan Mar 14, 2002 (1:27 pm)
The lean code does not mean an oxygen sensor failure, but that the oxygen sensor is detecting a lean air/fuel ratio. Too often people tend to "blame the messenger". Although it could be caused by low fuel pressure (fuel pump or filter), the most likely cause given your symptoms is a vacuum leak at the engine. Start by carefully inspecting all vacuum lines and hoses. 3800 engines have also had some intake manifold/gasket and throttle body base gasket issues. If vacuum lines have been positively eliminated as the source, try spraying WD40 these areas. If idle rpm changes you have a gasket leak.   Re the TCC solenoid, failure on your transaxle usually results in no converter clutch apply, not a failure to release. More common is wear of the tcc apply valve bore, a component in the transaxle valve body. Do you have the codes available to post?
#681 of 2228 Re: 95 Bonny Probs by bonnevilleman Mar 15, 2002 (5:53 am)
Unfortunately I don't have the code to post. I had written them down but have since lost the paper. The torque converter does lock however at 48 mph on the dot when driving unless accelerating rapidly (which I am afraid to do with the current problems.) I'll have to take some time under the hood and inspect the vacuum lines. I think that may be the problem b/c while the engine is above 1000 rpms it seems to run fine but the instant it goes below that it starts running rough. LOL I had a guy in a mustang gt 5.0 beside me at a stop light this morning and since the car runs rough it lunges as if it has a 454 under the hood. well he smoked off the line only to realize I only have a sick bonneville not a street rod LOL   PS. The car tries to adjust it's idling to compensate for the roughness but unfortunately it won't keep it an idle of 1100 rpms.
#682 of 2228 by alcan Mar 15, 2002 (6:16 am)
The hunting idle and lean air/fuel mixture would definitely lead me toward a vacuum leak. Keep us posted on what you find.
#683 of 2228 by alcan Mar 15, 2002 (7:00 am)
Another thought, might be a dirty mass air flow sensor but I'd check for vacuum leaks first.
#684 of 2228 I'll give it a try :) by bonnevilleman Mar 15, 2002 (7:24 am)
I'll pull her into the garage today or this evening and see what I can find on her. Thanks guys. I'll keep ya posted on what I find
#685 of 2228 95 bonneville problems by montanafan Mar 15, 2002 (7:48 am)
I am late to the discussion, but check the supercharger for a gasket leak around the pulley end or the base. Also noise, especially if just on start up after long rest, might be from the transmission.
#686 of 2228 by bonnevilleman Mar 15, 2002 (9:06 am)
I'll check that also Montana. My father-in-law has a body shop here and a new shop that's almost finished with no cars in it. He's going to let me use it tomorrow and he's going to help me with do the brakes on it and also check all this stuff out. I'll keep ya posted   Preston
#687 of 2228 by bonnevilleman Mar 19, 2002 (8:02 am)
well I pulled it into the shop and while my brakes were being done I checked out the vacuum lines that I could see...they all were intact and clear however the rubber hoses that connected them with other lines and components were rotted. I replaced all those but I don't know if I got them all b/c it's still running rough. I didn't have a chance to check the intake manifold gaskets or the SC pulley gaskets. I'll do that this weekend. Too many things to do and too little time.

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