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Pontiac won't start until you disconnect battery and wait 30 minutes, then reconnect
04-10-2017, 12:24 AM
Post: #1
Toungue Pontiac won't start until you disconnect battery and wait 30 minutes, then reconnect
Please Help!

ive only seen this question/situation/problem a time or two on the internet, and there was no solution to fix the actual problem so far.

Pontiac Grand Am 2004 v6

it will not start on its own in the morning,or the first time for the day, in order to start it each day/morning, (i have already figured out this is the only method that works) i have to disconnect my battery, (negative terminal) and leave it for atleast 30 minutes, i know it is at least 30 minutes because i have purposely tried to start it after 10, 15, and 30 minutes after initially disconnecting the battery.

like clock work, every day, after the battery has been disconnected for atleadt 30 minutes,then reconnected it start flawlessly, and for the rest of the day it start and runs perfect, like nothing is wrong with it.

oh yeah and when i try to start it before disconnecting the battery (i always try it the first time before disconnecting), when i turn the key, i get all the NORMAL signs, the gages do their thing, the car plays the tone you get when you turn the key, everything, when i turn it over, it is completely convincing that it will start, it cranks/turns over perfect, sounds healthy and full of juice. no coughing no lagg no hesitation, but it will not start. at all. then i disconnect the battery, leave it for 30 minutes, reconnect the battery, and BOOM it starts perfectly, and will run fine for the rest of the day, then when i park the car for the nigh, get up in the morning, it all starts over again.

i can tell you that its not the battery, not the fuel pump, not the starter not the solenoid, or anything of that type of nature. because when it starts, it starts perfectly. yeah maybe something i listed some of yall could say it could be one of those with the conditions of.....

we all know gm cars of around the same year model all have bad electrical problems eventuality, my problems actually started with the passlock security light issue, but after days of working/trying, and aggravation, i did successfully completely bypass the passlock system using a 2200 ohm resister
so i am thinking it has got to be 1 or 2 things, some sorta typa sensor thats out or needs fixed or needs be bypassed or something of that nature. or an electrical problem(that GM vehicles are known for).

if anybody has this same exact problem and needs this answered i got you.
anybody had this problem and fixed it, or had it fixed ( i think its simple, we just need the solution)
or anybody that believes they know what the issue is,
PLEASE INFORM US thanks so much,

ps. by the way this is the first ever in my life i have ever signed up to post to a forum, i did it because i cannot find answers anywhere
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04-10-2017, 05:55 AM
Post: #2
RE: Pontiac won't start until you disconnect battery and wait 30 minutes, then reconnect
To find the solution I would first figure out why it isn't starting, Lack of Fuel or Lack of Spark. That gives a starting point to know what direction to go. I would also have the computer scanned with a Full Function scanner. Record all code NUMBERS, post those numbers here for review, and have the computer cleared.

You could try giving it a small shot of starting fluid in the morning before unhooking the battery. If it tries to start, you are not getting fuel. That can still be an electrical problem if something is keeping the fuel pump from running. But at least it narrows the search.

I highly doubt that it is a sensor. "Most" of the sensors are just that, a sensor. They sense if something is wrong. Like a gas gauge senses how much gas is in the tank. If the tank is full and the sensor malfunctions and says that it's empty, the car still runs. But there are a couple that can stop the engine from running. They will usually show up on a scan.

Please check to see if you are loosing fuel or spark and get back to us.

Thanks for using the forum,
Garner

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04-10-2017, 10:23 AM
Post: #3
RE: Pontiac won't start until you disconnect battery and wait 30 minutes, then reconnect
To back up Garner, there are no sensors that will reset with disconnecting the battery. That should get you away from thinking there's a sensor issue. Technically the ECM should not reset anything by pulling a battery cable, but there are things in memory that go away, such as the module which records certain running parameters. Obviously those are relearned by the time the engine is warm and there are default settings used to get there.

Based on what you are telling us, I'd be leaning toward a bad ECM because it is "live" with battery power even what the engine is off. IOW, something cools off or goes into default mode when you take the power away for a bit. OTOH, as Garner stated you should confirm this as a fuel or spark issue because there are other parts to this puzzle.

BTW, not to point out the obvious but with a 13 year old car is it going to be worth your effort or would you be better off spending $10 on a battery switch and using it each night so you are ready to go in the morning?
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04-10-2017, 10:06 PM
Post: #4
RE: Pontiac won't start until you disconnect battery and wait 30 minutes, then reconnect
OK, reading Rupe's post makes me wonder if you could confirm the ECM as easy as leaving the battery hooked up and pulling the ECM fuse instead? Rupe? Would that narrow things down that way? If the car starts after pulling the fuse for 30 minutes then the ECM is bad?

Thanks for using the forum,
Garner

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04-10-2017, 11:52 PM
Post: #5
RE: Pontiac won't start until you disconnect battery and wait 30 minutes, then reconnect
Good point... and there's probably 2 fuses for the ECM tagged ecm A and ecm B in the fuse block. One would be switched and the other is hot full time.

Now if we could tie this together with another issue that would cinch it up. Perhaps the battery goes dead in a few days or a long weekend without explanation? Normally the car could sit for many weeks and not drain the battery to that point.

If pulling the fuses doesn't isolate the issue then perhaps pulling the plugs on the ECM just to make sure it's not something else doing a back-feed and overheating a component elsewhere. (Body Control Module?)

Still in all, it would be nice to know if it's a fuel or spark problem before going to the next level. That way we'd have a better grasp of what else may be involved or why the problem is happening.
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04-11-2017, 05:44 AM
Post: #6
RE: Pontiac won't start until you disconnect battery and wait 30 minutes, then reconnect
I totally agree that we need to know the basics. Fuel or spark issue. No matter what kind of computer and other gadgets you attach to it, it still needs fuel and spark. We need to know what is missing so we know what direction to go.

Thanks for using the forum,
Garner

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