95 Bonneville shut off

Reply

  #1  
Old 06-19-10, 09:25 AM
Member
Thread Starter
Join Date: Jan 2007
Location: New York
Posts: 29
95 Bonneville shut off

95 Bonneville starts runs and drives sudden shut off's randomly. let run in driveway and ran for ever went to put window down and shuts off and will not start. Tried this scenario twice same result. Any ideas would be graetly appreciated.
 
Sponsored Links
  #2  
Old 06-19-10, 09:47 AM
Member
Join Date: Aug 2006
Location: santa fe /texas
Posts: 998
possible dity battery cable to battery connection
poss low alternator output
( 'any' extra electrical load-causes too low a voltage for the engine electronics)
 
  #3  
Old 06-19-10, 11:24 AM
Member
Thread Starter
Join Date: Jan 2007
Location: New York
Posts: 29
Thanks will try and ket you know
 
  #4  
Old 06-19-10, 06:11 PM
Member
Join Date: Dec 2002
Location: Pittsburgh, PA
Posts: 553
Any check engine lights? I had this happen on a '98 Bonneville and it was the crank sensor
 
  #5  
Old 06-19-10, 07:27 PM
Member
Thread Starter
Join Date: Jan 2007
Location: New York
Posts: 29
no chk eng lights checked fuel pressure, alt seems good but still shuts off when using power windows. can run blower and lights no prob stumped for tonight will get back to it tomorrow. Could it still be the alt intermittently? any other suggestions are graetly appreciated. Thanks
 
  #6  
Old 06-20-10, 04:54 AM
Unclediezel's Avatar
Member
Join Date: Dec 2006
Location: Northeastern PA.
Posts: 2,230
Just humor me.....

If you suspect low alt. output , or Battery cable issues, Try the scenario using a different "LOAD". A/C blower, wipers and rear deffogger all use the same or more current than P/W. Heck , try em all at the same time....

If you can Isolate the concern to windows only, Check the fat pink wire at the ignition switch for "Heat" damage. If you have express down windows, Listen carefully to the door, and ensure the motor Stops running when it hits bottom . (A definite Audible Hum, Followed by a relay "Click") .
Not likely, but entirely possible, you may just have a bad Window switch.
 
  #7  
Old 06-20-10, 08:30 PM
Member
Join Date: Oct 2008
Posts: 1,312
The key thing here is probably "voltage" and too low of a voltage...

You may have been in a home and the A/C kicks on and the lights dim for a moment. That is a large load being placed on the electrical system and this makes the lights dim.

With other homes this problem does not occur.

And with vehicles, if the voltage gets too low, the electronics and in particular the engine computer will no longer function. (Thus the engine shutting off.)

Two things can cause too low of a voltage. One is not enough power. The other is too large of an electrical load being placed on the electrical system (like a short or faulty wire/switch as discussed above).

You can monitor the voltage with a multimeter set to 20 volts DC and the test leads on the battery cables*. The voltage should be around 12.65 volts with the vehicle off. Then around 13/14 volts after the vehicle starts and the alternator kicks in to charge the battery.

*There is a difference from measuring the voltage on the battery posts and the metal of the battery terminals. If there is a poor connection, the battery posts may measure a good voltage, but measuring the voltage on the metal of the terminals will get a different reading! (Measure both!)

So one test is to see if the battery has a good charge. Just vehicle off, nothing using power. Should be above 12.65 volts.

Then start vehicle and it should be about 13/14 volts. The alternator has kicked in and is charging the battery.

Then one person measure the battery voltage while someone presses the window down button. If you get a really low voltage like 9 volts, try the same test on a different vehicle, see what happens!

Also there can be a poor electrical connection "along the way" between the battery/alternator and the interior of the vehicle. So also try measuring the voltage at an inside the vehicle fuse box and use a ground connection inside the vehicle as well.

If there is a poor connection "along the way" (which would also include a poor ground), the battery may measure a good 13/14 volts, but the inside of the vehicle may only measure 8/9 volts when a window is lowered.

And/or if there is a *very* large load being placed on the electrical system, this will drag down the voltage (as discussed above). Try another window and see if that does the same thing. If not, then that would point to a problem with the one window.

Anyway with a multimeter, you can "see" the voltages and "see" what is going on with the electrical system.

How to use a multimeter...
how to use a multimeter on a car - Google Search
 
  #8  
Old 06-22-10, 08:15 PM
Member
Thread Starter
Join Date: Jan 2007
Location: New York
Posts: 29
Thanks to everyone I seem to have a voltage or ground problem but haven't had time to pinpoint it yet. Hoping to get to it an Wed. night and put the mentioned tests to work. Thanks again will post the results.
 
  #9  
Old 06-22-10, 08:19 PM
Member
Join Date: Dec 2002
Location: Pittsburgh, PA
Posts: 553
I know on my '98 Bonneville there are grounds on the front of t\he block, on each front fender, one by the oil pump and two ground blocks under the carpet under each front door. These ground buss' are known to corrode.
 
  #10  
Old 06-24-10, 06:09 PM
Member
Thread Starter
Join Date: Jan 2007
Location: New York
Posts: 29
I only have 8.5 volts to the fuel pump? Cant find any bad grounds and have continuity through everything. Any idea where to go next?
 
  #11  
Old 06-24-10, 08:31 PM
Member
Join Date: Oct 2008
Posts: 1,312
  #12  
Old 06-26-10, 05:16 PM
Member
Thread Starter
Join Date: Jan 2007
Location: New York
Posts: 29
The Car Runs. Somewhere along the line one of the multiple relays and switches one of them is bad. By-passed them with a fuseable link to get it back on the road. Thanks to all for all the help.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes