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Pontiac Bonneville Transmisssion

45 messages,  Last post on Dec 07, 2009 at 1:59 PM

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What is this discussion about? Pontiac Bonneville, Transmission, Sedan

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#36 of 45 Re: transmission issue [imidazol97] by 1994usedbon Nov 29, 2008 (2:33 pm)
Replying to: imidazol97 (Nov 28, 2008 8:28 am) The ''buckin'' like its trying to shift into or out of overdrive....   thanks for the reply.
#37 of 45 Transmission Issue by scscars Nov 30, 2008 (5:06 pm)
I just resolved the "bucking" problem with the 4T65-E transmission on my 2002 Bonneville with 135,000 miles. This problem has multiple causes, but the main one is jammed shift and EPC solenoids. The jamming comes from particulates accumulating in the solenoids and impeding their functions. The particulates come from the overdrive and 3rd gear clutches burning out. Also, the bucking and, in my case, jolting, also came from wear in the 2nd gear spline, drive chain, boost valve, and channel plate sleeve.   I asked the transmission specialist where I took the car if more frequent maintenance would have helped, and he said that while I could have gotten a few more miles out of the tranny by more frequent fluid changes ( I was changing at every 30,000 miles), these transmissions start failing at between 125,000 and 175,000 miles. Also, to completely repair the transmission is not cheap, at least not in my particular case, but it was less expensive than the down payment on a new car, and since financing a new car is next to impossible right now, and that I'm not ready to part with my Bonneville, I look at it as a new lease on life.   1994usedbon, may your problem be less expensive and less extensive. The 4T65-E transmission didn't come along until 1997, so your experience may be much different. Good luck!
#38 of 45 hi my name is jamie by jgrov Apr 10, 2009 (10:46 am)
i have a 1999 boneville ssei and every time i accelerate it jerks in every gear is there something i can do and it also jerks when i shift to neutral what could be the problem?
#39 of 45 2003 Transmission shifting hard through all gears. by pgfalcon Nov 14, 2009 (9:34 pm)
I have 2003 Bonneville. It has about 130,000 miles on it and I do not know if the transmission fluid has ever been changed. The fluid levels are at the right level. Recently the has incurred a slight noticable lunge when shifting through the gears. I have been reading in the forum and curious if it is the Transmission Valve Body or the Transmission Torque Converter Solenoid. I am also going to change the Transmission Fluid. Are either of the parts external or are the inside the Transmission. Replies to this message: imidazol97 (Nov 15, 2009 3:58 am) imidazol97 (Nov 16, 2009 6:42 am) pgfalcon (Nov 16, 2009 4:58 pm) scscars (Nov 15, 2009 3:43 pm)
#40 of 45 Re: 2003 Transmission shifting hard through all gears. [pgfalcon] by imidazol97 Nov 15, 2009 (3:58 am)
Replying to: pgfalcon (Nov 14, 2009 9:34 pm) How's the motor running? Replies to this message: imidazol97 (Nov 16, 2009 6:42 am) pgfalcon (Nov 16, 2009 4:58 pm)
#41 of 45 Re: 2003 Transmission shifting hard through all gears. [pgfalcon] by scscars Nov 15, 2009 (3:43 pm)
Replying to: pgfalcon (Nov 14, 2009 9:34 pm) The torque converter solenoid is internal. Of that, I'm certain. I'm not sure about the transmission valve body. After having multiple problems with the 4T-65E transmission on my '02 Bonneville last year, it's likely that major issues concerning jolting, lunging, or jerking when moving between gears is going to be caused by an internal component. Good luck, and hope your problem turns out to be an inexpensive one.
#42 of 45 Re: 2003 Transmission shifting hard through all gears. [imidazol97] by imidazol97 Nov 16, 2009 (6:42 am)
Replying to: imidazol97 (Nov 15, 2009 3:58 am) I repeat: How's the motor running?   Have the plugs and wires been replaced at the 90-100K mileage as specified in the owner handbook? Plugs AC iridium same as originals?   Are there any other parts that are not working quite right? MAF sensor might be one?   Does the throttle body need cleaning and that extra goop blocking the bleed air around the throttle plate affecting how the IAC can control the very low speed mixture?   Before blaming trans, always make sure the motor is up to snuff. Then it's time to be sure the transmission is doing what it needs.   There also are a few who feel a motor mount wears and allows more movement giving more unevenness to the shifts. Replies to this message: pgfalcon (Nov 16, 2009 4:58 pm)
#43 of 45 Re: 2003 Transmission shifting hard through all gears. [imidazol97] by pgfalcon Nov 16, 2009 (4:58 pm)
Replying to: imidazol97 (Nov 16, 2009 6:42 am) I have replaced the spark plugs, wires, new air filter, new fuel filter checked all of the fuses, changed the oil in this car. Sometimes when I start it takes several seconds for the engine to turn over and start the car. When I apply the accelerator it fires right up. I have also been using high octane fuel and a fuel additive. I have also used Lucas Injector Cleaner. The vehicle does get better fuel mileage even gotten 450 for an 18 gallon tank half highway. I do have a slight oil leak near the head. Also the slight jerking happens in cycles not all the time. Sometimes it shifts just fine and sometimes I can feel it noticably.    Also the engine will sometimes stop running if left to idle for about 10 minutes. Once while the hood was open I noticed a slight puff of air/steam come near the water pump and intake. Any suggestions?   To add to this... the service vehicle soon light comes on and off every few days. It has also been dying when turning slow turns or u turns. I assume the power steering is using up the last bit of power causing it die.    PGFALCON
#44 of 45 95 bonneville with 170k by wavell5er Dec 06, 2009 (7:54 pm)
am having problem with my tranny about 1 year now , when the car is cold the tranny will not go into no gear.will go after 10 min and shift fine like there is no problem.i change the fluid same problem.the engine run like dream Replies to this message: imidazol97 (Dec 07, 2009 1:59 pm)
#45 of 45 Re: 95 bonneville with 170k [wavell5er] by imidazol97 Dec 07, 2009 (1:59 pm)
Replying to: wavell5er (Dec 06, 2009 7:54 pm) That might be a terminal sign or might just be the pressure control module. I'd get a diagnosis from more than one transmission shop to see. I wouldn't try just one because they might try to lead you to a rebuild. I believe you have a 4T60E transmission and I believe, repeat believe, those pressure control modules can be replaced without taking the transmission out of the car.   Do some searching for pressure control module and transmission will not go in gear and see what you can learn.   Good luck.

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