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Pontiac Bonneville General Maintenance and Repair



  • We also have a 92 Bonneville. Several years ago the same thing happened. It was summer, and just started happening. Nobody could find the problem. One day, in the winter it would start, but continue misfiring from the time it started, then it wouldn't start at all. We found out it was the coil. We replaced it, & it ran better than when we first got it. We bought it used with 108,000 miles, in 1999. It now has 274,000 miles, & still runs great.

    Several thousand coils were produced, & many used in new Bonnevilles, that had air bubbles in them. When the air bubbles get moisture in them the current does not go on a direct path, but finds an easer path through the water.
  • Hi - I just bought a '99 Bonneville SE with 59,000 miles on it. The small red security light on the top of the dash doesn't light. Also the System Monitor in the dash works except for the "door ajar" feature. I can live without this (I love this car!)
    However, I called a mechanic and he made a big deal about it and said that if I ever have to change my battery or my battery dies, my car will be unable to start and I will have a big repair bill. I called two Pontiac dealerships and they said they never heard of this. I just spent all my money on this car and will have to wait to take it in to check it out. I'm quite handy with cars, is there anything I can try myself?
  • alcanalcan Posts: 2,550
    Might be the door switch built into the door latch, or a broken wire in the harness between the door and the body. Do the interior lights and retained accessory power work properly?
  • Yes, everything works except the door ajar warning (none of the doors show "open" on the system monitor when ajar) and the little red blinking light on top of the dash never lights up. I'll try to look at the latch. :confuse:
  • I just wanted to update my original post. I checked the hose attached to the fuel pressure regulator because of a previous post for a different problem. When the engine was hot and there was fuel pressure, there was fuel in the vacuum hoses. I replaced the regulator and haven't had a backfire in about a month.
  • jprottjprott Posts: 1
    To #50,I had the same problem with crankshaft sensor,took awhile and 2 mechanics to find it out,my 93 bonneville would run great but when i stop and let it run idle then go it would die and not crank till dayz later,but anywho NOW im having problems with everytime i push the brakes i get a quick dimming of the lights and power,the wipers have never went fast,or anything else for that matter,could this be a ground issue,i put a new altenator and battery both on it,still did it,car runs great but im afraid imma get stuff oneday with my dimming problem,if anyone can help id love it!!!!!!!!!!!!!!!!!!!1 :sick:
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 22,720
    Check your postives and grounds from the battery to motor and grounds for corrosion inside the covered wires and at the contacts. There are other grounds next to the parking brake and next to the driver's and passenger's seats that get mentioned but you're not describing other symptoms.
    Email me at address in profile. I had a 93 LeSabre.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • Hi everyone, I have a 2000 Bonneville SLE (I'm the second owner) and have some issues with it. If anyone has had the problems that I'm about to list I'd appreciate some advice. About 2 weeks ago the air bag light started coming on and chiming intermittently when driving, it did some seem to be related to acceleration or deceleration, it was just random. Then the security light started doing the same thing, now both warning lights chime and flash on and off while driving - quite unnerving while driving. In addition, sometimes the radio volume turns down spontaneously and the CD player shuts off AND the lights in the defrost/heat/AC module do not work sometimes. Oh yeah, and the keyless entry system does not work with either transmitter (its not the batteries, I've changed those, and they do not need synchornising) All of these can now happen in the same 10 minute drive. Needless to say the car is in the shop and I'm waiting to see how much the dealer will try to get out of me this time. I'm thinking that it is a system wide electrical problem that would have evolved to one day the car not starting at all or stalling on the highway.
    So, if anyone has opinions on my seemingly possessed' I'd be happy for any advice.
  • I own a 92 bonneville SE with 180K miles and i have had a lot of problems. Most recently one problem that seems to amaze me is that i feel my car rock back and forth when slowing down or pushing on the brake (kinda like the brakes are going bad) but i have had the calipers replaced along with the rotors, pads, master cylinder, and all the lines. I have check and blead the brakes just to make sure there wasn't any air in the lines. It has ABS so Im not sure if the ABS sensor is going bad and making the brakes go crazy but i don't know what to do anymore. Does anyone have a clue or slightest idea what could be happening? :blush:

    The second big problem Im having is when Im turning or using my front suspension (speed bumps or slightly raised curbs) i can hear a clunk noise in my car and feel it in the steering wheel and literally hear it with the windows down. I have had someone tell me to change my struts but i would like to have a little idea what could be wrong with this before i go and replace everything. Can anyone help me?
  • I'm having a problem with my heater fan. in the winter when it starts getting cold out....the heater fan won't come on even when the switches are all on full blast.
    Once in a while, the heater fan will just come on automatically. Does anyone know what the problem could be?

    Another problem I'm having is with my signal lights. They blow a fuse the instant I put a new fuse in. So, I have no signal lights. I even make sure to put in the correct amp. Any suggestions on what the problem might be?
    Any advice would be appreciated.
  • Well, I was having problems with the electrical part of my '94 Bonneville. I went through many alternators, new batteries........and still, every once in a while my car would not start in the morning after leaving it sit for a night.

    We took it into a shop, and they replace a "faulty alternator". That fixed the problem (or so we thought).

    We found out that the antenna in the car could be what is draining the battery each night!! So we disconnected the antenna from the battery. (so that it just stays up permanently) and amazingly....No more dead battery. ;)
  • The problem is most likely a short circuit in the blower motor. I had the same problem earlier this year on my '02 SLE. The fan went out during the winter months intermittently, but as warmer weather set in, the fan worked regularly. However, just after I returned from a road trip in August, the fan went out completely. My Pontiac dealership's mechanic identified the problem easily enough, but between the parts and labor, the bill came to about $400. :(

    You may be able to do better with an independent mechanic or a Mr. Goodwrench with lower labor rates than what we have in Chicago. Hope this helps.
  • Pedal goes to floor. Rebuilt MC installed by shop, system bled all around, still has soft pedal that goes to floor. Pumping brakes hardens it up, but pedal bleeds down quickly.
    I had previous problem with rusted lines, replaced both rear lines from break point under left rear passenger door. MC had run dry. Soft pedal problems started after that. What is function of two cylindrical items located in-line on each brake line, under left rear passenger area? Almost look like check valves? They were rusty on exterior but not interior.
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 22,720
    Sounds like cup edges in master cylinder were damaged when it went dry and when it goes past the normal movement it had for years. It gets into rough areas that tear the seal edges, then you get bleeddown under pressure after that.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • jgtmiljgtmil Posts: 19
    Just bought a 1995 bonneville with 68k. has a couple of problems, the traction controll light stays on the switch seems to have no effect, and the radio controlls on the steering wheel do not work can someone help. Also can someone tell me if this overheating and warped intake effect the supercharged versions.
  • alcanalcan Posts: 2,550
    " the traction controll light stays on "

    Check for any stored trouble codes first

    "can someone tell me if this overheating and warped intake effect the supercharged versions"

    No. There is no composite upper intake plenum, it's replaced by the supercharger.
  • Sadly, I must have misled you on the timing. The first master cylinder (OEM) went bad in the manner I mentioned and went dry. The NEW master cylinder (probably aftermarket - I didn't check to see what the shop used, but the cost was not representative of new dealer stock) is doing the exact same thing as the old one did. The old one was also leaking between the MC and the booster, so an initial diagnosis was easy. This second MC is what's frustrating me.
    With my luck, it's a faulty rebuild. Thanks for responding, though.
  • chef5chef5 Posts: 2
    I own a 98 pontiac bonneville se and I am having the same exact problem you had. Did you ever find out what was causing this. Please let me know.
  • jgtmiljgtmil Posts: 19
    you may already have a fix, but if you have a the auto dim mirror ther is a piece of plastic that goes between the cieling and the mirror adapter. If not the what i did is cut a piece of 1/16-1/8 thick plastic and wedged it between the mirroe bracket and the glass...worked for me.
  • jgtmiljgtmil Posts: 19
    does anyone know the absolute temp range for a series II 3.8 S/C. My dealer says that 225 is acceptable but it appears that at idle this engine gets a little hotter than that. I replaced the thermostat with OEM 195 degree. and also made sure to relieve all air in cooling system to avoid vapor lock. also is there a fuse somewhere for the radio controlls on the steering wheel.
  • Did you ever get a reply to your heated seat problem? My 2002 Bonneville has the exact same heated seat issue.
  • on my 96 bonneville sse i had a similar intermittent problem with the dash and other electrical components

    after i replaced bulbs/ starter/ battery etc i found that the positive battery cable, where it connects to the battery is actually poorly designed as two seperate cables.

    these two cables ends are in one rubberized "boot" through wich a bolt passes and screws into the positive terminal on the battery.

    pull the boot back and there will be corrosion in between the two cable ends. clean and seal the ends. tighten the bolt and no more compass/information center/gauge reset problems!

    hope i helped-v
  • I have a '93 Pontiac Bonneville and I'm having major issues with it. A couple of weeks ago it died on me so I replaced the battery and alternator. It now runs but there is this loud banging or clicking noise near the engine. I've had 2 people tell me it may be a rod in the engine. My situation is that I am a single mom of 2 kids and I really don't have the money for diagnostic testing let alone to get it fixed if it is the engine. How much could I sell this vehicle for or does anyone know of how I can get cheap/free diagnostic testing?? Thank you so much for any replies!!
  • I had a burned electrical smell when I turned up the fan speed for more heat. On the 5 speed fan switch the 1st 4 speeds do not blow any air, however on the 5th or high speed fan I get a very weak air flow. Is this problem the blower motor or something else. If so where is the problem located in the car?
  • jgtmiljgtmil Posts: 19
    I read some messages earlier about the fuel gauge being wrong. I had the same problem so just to try something I put a different "gas cap" on this fixed my problem. some of you with the same problem may want to try this, if you have two cars just swap them for a while to see what it does for you before you buy another...
  • We have a 92 SE that had a similar clunk in the front end. Turned out to be nothing more than the bushings for the swaybar linkage. $50 in parts and 1/2 hour in the driveway and the problem was fixed.
  • We have a 92 SE that has developed a severe oil/coolant leak. Mostly coolant with some oil mixed in. It seems to be coming from the top of the engine on the rear bank of cylinders. I suspect a manifold gasket leak. I have seen the thread on a similar problem with later models. I am wondering if the replacement procedures for the 92 are the same? Worst case scenario is a head gasket, but I think the leak is too high up to be that. Any advice would be appreciated.

    I don't want to spend a lot of money on it, as the book value isn't much with 114,000 miles on it and being 13 years old. Just want to fix it good enough to sell it. We got a 2002 SSEI, Supercharged this weekend to replace it.
  • We just bought an 01 SSEI, Supercharged. The manual and the sticker on the fuel filler door say use premium unleaded fuel (91 octane)

    I have been told that the computer and anti-knock sensor will compensate and the engine will run fine with 87 Octane. Only that fuel economy and power may suffer.

    Any thoughts?
  • I have a 91 bonnevile which is missing eradically for about the first 30-45 min. of operation. Thinking it being a fuel delivery problem,changed fuel filter, no change. Installed new plugs as it has that typeof miss. Ran perfect for the 700 mile trip Thanksgiving(did that trip on one tank of fuel). Got home, next morning it was missing eradically from initial start-up untill driven some 45min. Shut it off for 5min., re-start and process starts all over again. Check engine light has never come on prior to , during or after shut-down and restarting of car. Steer me in the right direction, fuel problem, ignition, or electronic? Thanks..Brant
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