PontiacBonnevilleClub.com
http://www.pontiacbonnevilleclub.com/forum/

Sudden shut down
http://www.pontiacbonnevilleclub.com/forum/general-chat/topic51926.html
Page 1 of 1

Author:  NoShowCar [ Sat Aug 11, 2018 11:48 pm ]
Post subject:  Sudden shut down

Looking for clues as to what I should be looking for on my '89 SSE which simply turned off while driving at low speed in a neighborhood. Coasted to a stop in neutral. Placed in park and started normally and drove off like nothing happened. Now I can't trust it. When will it do this again? Oh yes, plenty of gas. All gages normal. Any ideas?

Author:  96 SSEi [ Sun Aug 12, 2018 9:49 am ]
Post subject:  Re: Sudden shut down

how are your plugs/wires. did it die just once or is it a regular issue?

Author:  RJolly87 [ Sun Aug 12, 2018 10:04 am ]
Post subject:  Re: Sudden shut down

It could be many many things, none of which can be tracked down until the issue repeats. If it restarts without incident, I would just make a note of it until there is more information to consider. You can also scan for codes just to see if anything set.

Until then, worry not!

Author:  NoShowCar [ Mon Aug 13, 2018 1:55 am ]
Post subject:  Re: Sudden shut down

96 SSEi wrote:
how are your plugs/wires. did it die just once or is it a regular issue?


Engine and peripherals are only 10,000 miles old. Reman installed by previous owner. So plugs and wires are nearly new. All ign thoroughly inspected last week due to ign failure described in '87 - '91 Mech. & Maint. topics in a reply under "No start, manifold backfire".

This was not an ignition failure. It was a total electrical shutdown like I had pulled off the main battery cable. But it restarted normally not a minute later and ran normally. Now I can't trust it not to die at a critical moment in traffic or a distance from home.

Author:  NoShowCar [ Mon Aug 13, 2018 2:14 am ]
Post subject:  Re: Sudden shut down

RJolly87 wrote:
It could be many many things, none of which can be tracked down until the issue repeats. If it restarts without incident, I would just make a note of it until there is more information to consider. You can also scan for codes just to see if anything set.

Until then, worry not!


How can I not worry when it might die on me crossing a busy road or a distance from home?

Last week it did experience a different failure as described in a recent reply to "No start, manifold backfire" under Mech & Maint. under '87 to '91. I believe I resolved that issue, but this is something new and I think, unrelated. The whole dashboard went dark.

I guess I'll have to wait until it does it again and try to remember ALL the details that occurred.

Author:  95naSTA [ Mon Aug 13, 2018 6:51 am ]
Post subject:  Re: Sudden shut down

Check all the battery connections for corrosion and have the battery tested.

I had a similar failure in my 95 back in 03 while going down a hill that had no shoulder and a quick left hand turn into an intersection. That was fun. It turned out to be a bad cell in the battery. A new batt solved it.

Author:  MattStrike [ Mon Aug 13, 2018 9:58 am ]
Post subject:  Re: Sudden shut down

Another thing to check is that the battery positive wire that goes down to the starter doesn't have any bare/burnt shielding on the wire that could be shorting to the frame/engine. It's possible that the wire wasn't routed properly during the motor replacement and it may be intermittently shorting to the block/frame or exhaust.

Check both ends of all cables to make sure they aren't loose while you are checking for corrosion.

Author:  RJolly87 [ Mon Aug 13, 2018 9:48 pm ]
Post subject:  Re: Sudden shut down

NoShowCar wrote:
This was not an ignition failure. It was a total electrical shutdown like I had pulled off the main battery cable. But it restarted normally not a minute later and ran normally. Now I can't trust it not to die at a critical moment in traffic or a distance from home.


This was information that we didn't have previously. I was under the impression it was a simple stall.

The list of failures that can cause this is relatively short thankfully, major things like the ignition switch, or one of the ignition power paths.

If it was a simple key off, key back on restart, I would check circuit breakers and ignition switch.

Author:  NoShowCar [ Tue Aug 14, 2018 3:20 am ]
Post subject:  Re: Sudden shut down

Thanks to all the suggestions. I think I have this resolved. My first thought when battery connections were suggested was - no way. New battery, new cables (I thought) and recent major engine work. Well, I tried wiggling the battery connections and, by golly, it wiggled. Shouldn't! So I disconnected both of them and found that one of the positive cables was not new and had a bit of thin oxide on the contacting surfaces. So, of course I cleaned all the surfaces I could reach and reassembled good and tight with anti corrosion lube where I thought it should be. Now it cranked smartly and started instantly before, so I never suspected a poor connection. Because it was just a little loose and a little corroded, I believe it was the problem.
I have noticed other examples of shoddy electrical service on this car by a local dealer.
Thanks again for the key info.

Author:  NoShowCar [ Mon Aug 27, 2018 3:49 am ]
Post subject:  Re: Sudden shut down (solved)

Recently completed about a 600 mile trip. No further glitches. Only issue was I got about 23 MPG avg. My old '90 Buick LeSabre with the same power train would get 29 on a trip quite consistently.

Author:  Bugsi [ Thu Aug 30, 2018 12:26 am ]
Post subject:  Re: Sudden shut down

A suggestion: If (when) you think you've got the problem licked, tack "[SOLVED]" to the end of your post's subject.

Page 1 of 1 All times are UTC - 5 hours [ DST ]
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/