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#4470446 - 07/25/17 09:21 PM 06 lucerne 3,8
lucerne06 Offline


Registered: 03/07/09
Posts: 446
Loc: northeast
got a p300 code misfire on multiple clynders, car was running rough wanting to stall....replaced all three coil packs and a new ignition module....started car and it was still running rough and sluggish waited a few minutes then took it for a drive, starting running better, then nice and smooth.. But one weird thing happened after about a three miles drive, stopped at a light and when I went to go, it just stalled right out...had to pull over it just died...put it in park and it started right back up and I drove it home , idled it for another 10 min, drove another mile and it seemed fine...what does anyone think why it just died like that. ??


Edited by lucerne06 (07/25/17 09:22 PM)

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#4470505 - 07/25/17 10:58 PM Re: 06 lucerne 3,8 [Re: lucerne06]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
Sounds like you forgot to clear the codes before you installed the new parts?
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#4470513 - 07/25/17 11:05 PM Re: 06 lucerne 3,8 [Re: lucerne06]
lucerne06 Offline


Registered: 03/07/09
Posts: 446
Loc: northeast
i actually installed the parts, then before starting cleared the codes, then started it...after it just stopped, no other codes presented..

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#4470527 - 07/25/17 11:37 PM Re: 06 lucerne 3,8 [Re: lucerne06]
WhyMe Offline


Registered: 12/18/12
Posts: 513
Loc: Washington for now

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#4470559 - 07/26/17 01:39 AM Re: 06 lucerne 3,8 [Re: lucerne06]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
There's shraeder valve right on the fuel rail for hooking up your fuel pressure gauge; see what your fuel pressure is; should be from 40 to 60 psi. If your fuel pressure is good and your spark is good, turn your attention to the crank sensor.

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#4470584 - 07/26/17 04:37 AM Re: 06 lucerne 3,8 [Re: lucerne06]
Lubener Offline


Registered: 01/22/11
Posts: 2577
Loc: N.Ohio
Originally Posted By: lucerne06
got a p300 code misfire on multiple clynders, car was running rough wanting to stall....replaced all three coil packs and a new ignition module....started car and it was still running rough and sluggish waited a few minutes then took it for a drive, starting running better, then nice and smooth.. But one weird thing happened after about a three miles drive, stopped at a light and when I went to go, it just stalled right out...had to pull over it just died...put it in park and it started right back up and I drove it home , idled it for another 10 min, drove another mile and it seemed fine...what does anyone think why it just died like that. ??


Probably because you didn't fix the problem.Happens frequently when one guesses at a problem instead of diagnosing it.


Edited by Lubener (07/26/17 04:38 AM)
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#4470791 - 07/26/17 10:14 AM Re: 06 lucerne 3,8 [Re: lucerne06]
bigt61 Offline


Registered: 02/12/13
Posts: 3117
Loc: Virginia
Could be a fuel pump on it's way out. Do as Merkava suggested above. Don't let it run low on fuel as that will kill a weak pump. Don't fill it up either as it's a lot to drain if you have to end up replacing the pump.
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#4471347 - 07/26/17 08:04 PM Re: 06 lucerne 3,8 [Re: lucerne06]
caravanmike Offline


Registered: 05/09/09
Posts: 1072
Loc: ohio
Check the rear seat pdc, for the rear seat hitting the fuel pump relay. Well known tsb.
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#4471395 - 07/26/17 09:19 PM Re: 06 lucerne 3,8 [Re: caravanmike]
Hootbro Offline


Registered: 08/25/03
Posts: 2414
Loc: DELAWARE
Originally Posted By: caravanmike
Check the rear seat pdc, for the rear seat hitting the fuel pump relay. Well known tsb.


What he said.

https://www.youtube.com/watch?v=G4EkAd9B1uA
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#4471413 - 07/26/17 09:36 PM Re: 06 lucerne 3,8 [Re: lucerne06]
lucerne06 Offline


Registered: 03/07/09
Posts: 446
Loc: northeast
did find one thing today, my coolant resivor tank was about two inches low from its normal spot, I also found indications of coolant leaking from the gasket next to the alternator, same color as my coolant...thinking head gasket...no white smoke, no milky white in oil , no film in coolant resivror..???


Edited by lucerne06 (07/26/17 09:36 PM)

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#4471499 - 07/26/17 11:26 PM Re: 06 lucerne 3,8 [Re: lucerne06]
WhyMe Offline


Registered: 12/18/12
Posts: 513
Loc: Washington for now
Originally Posted By: lucerne06
did find one thing today, my coolant resivor tank was about two inches low from its normal spot, I also found indications of coolant leaking from the gasket next to the alternator, same color as my coolant...thinking head gasket...no white smoke, no milky white in oil , no film in coolant resivror..???


intake manifold gaskets. very common on GM V6

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#4473337 - 07/28/17 08:08 PM Re: 06 lucerne 3,8 [Re: lucerne06]
WyrTwister Offline


Registered: 01/13/13
Posts: 1531
Loc: Texas
If you are loosing coolant , also inspect the 2 plastic coolant elbows , between the engine & the serpentine belt tensioner . From there , the coolant goes to the 2 heater hoses .

Do a youtube search .

As far as the fuel pump relay under the rear seat , Eric O. - South Main Auto , has a good youtube video .
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