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Sedans Pontiac Bonneville Pontiac Bonneville Transmisssion
43 messages, Last post on Nov 16, 2009 at 4:58 PM
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car runs good but sometimes it seems like it gets stuck between overdrive and third and sometimes about 65-70 it will kind of loose power and vibrate, you let off the gas or push it down further it quits for a while mostly on inclines
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Replying to: rbranham (Nov 28, 2007 4:10 pm) When were the spark plugs changed last? When were the spark plugs wires changed last time? My suspicion is that it's the plug wires or the plugs. It probably is lugging at a low RPM in 4th on a slight incline and you accelerate slightly and it's misfiring. Try driving the same circumstance or place with the car in 3 instead of 4. That will keep the motor turning faster and you won't notice the slight misfire. Or you can do the incline at a lower speed in 3rd at th same RPM and it probably won't do it because in third the load on the motor won't be as great on the same incline because of the lower gearing. It might be a transmission probably but I doubt it. You can go to one of the auto parts stores that does free scans for codes on your car and you'll probably have a code for misfiring and it may give a particular cylinder on which it occurs or it may be random misfire. Advance Auto does it in this area. Even though the check engine light is not on there may be a code. If it gets worse the code might cause the light to turn on. |
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Hello all, when I accelerate quickly from a dead stop my transmission, or at least my front wheels chatter or maybe a better description would be the feeling of ratcheting. this ratcheting can be scribed as on the verge of violent, once again this only occurs from a dead stop. No other anomalies are noted at any other speeds or shift points. The year is 1999 with around 140,000 miles.
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I have a 96 Bonneville SSEI that sometimes while driving it feels like it is stuck in 2nd gear. If I turn the car off and then back on it sometimes shifts fine then, first thru overdrive. Could that be transmission modulator valve or transmission control solenoid? Tranny was flushed and new filtered in December. Also, were is transmission control solenoid located. One day it shifts fine and the next day it may not.
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Replying to: tklavenga (Feb 16, 2008 2:47 pm) Do you mean it had one of those flushes where they connect hoses and supposedly change all the fluid without dropping the oil pan and replacing the filter? If so, did they put in an additive? |
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Replying to: victor53 (Dec 04, 2007 8:38 pm) Does it seem like the firewall under the windshield is jumping up and down? That may mean that a certain part, I believe a Sprague (spelling?) is slipping. Try using 1st gear and see if the same thing happens. I'd recommend against accelerating hard enough to cause that to happen. It may be reduced pressures in the transmission due to wear on the pump. It may be pressure control valve; some of those have had problems. Your transmission has 140K miles and that's good.
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My 95 Bonneville will run down the hiway for about 15 minutes in overdrive, and will, on its own,shift back into drive, and will not return into overdrive unless I stop for fuel or to let it cool. When I resume the trip it will work fine for about 15 mins. and then do the same thing again, every time. Can anyone help me determine the cause of this problem? Thank you. Jim
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Replying to: friend3 (Feb 19, 2008 3:07 pm) Are you running too cool. Without checking a 93 manual and 98 that I have, I believe it won't shift into 4th under the coolant reaches a certain temperature on a cold startup. The obvious reason is pollution control and running faster which heats up the coolant faster decreasing pollution. IF your thermostat is opening too much the motor may be cooling too low and the PCM is doing what it is supposed to do. I suggest these fairly innocuous reasons it may be doing things strangely, because you haven't said anything about shift quality being back. Late, early, rough upshifts. Strange shifting while cold or coming to a stop aren't mentioned. If your car has a temperature gauge, follow it to see if things are acting normally. If the thermostat hasn't been changed in a few years, that would be my first suspect. Are you in a cold climate?
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