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#4679533 - 02/27/18 09:49 AM Coil pack going bad?
NavyVet88 Offline


Registered: 09/27/15
Posts: 515
Loc: Alabama
2003 Buick Century 3.1L

Here lately ive noticed that first starting the car after a few days without running, the car is temperamental about starting. By that I mean it takes two or three tries to get it started. The engine turns over just fine, but it doesn't actually start until mostly the 3rd and sometimes 4th try.

The motor was replaced about a year ago(used of course) just after I got the car and it was starting just fine at the time. Battery was replaced at the same time. Is this a coil pack going bad?

Thanks guys,
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2013 Honda Civic LX 1.8L 127k M1 EP 0w20 with Fram XG7317
2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A

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#4679548 - 02/27/18 10:01 AM Re: Coil pack going bad? [Re: NavyVet88]
JMJNet Offline


Registered: 09/06/07
Posts: 934
Loc: TX, USA
Load test the battery?
Check the Starter?
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#4679579 - 02/27/18 10:42 AM Re: Coil pack going bad? [Re: NavyVet88]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
If it is only after sitting for a couple days, I would think the fuel pressure is not being maintained in the system when off. Could be a bad check valve in the fuel pump assembly. Try turning the key to the on position a couple times before starting to let the fuel system prime.
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#4679582 - 02/27/18 10:48 AM Re: Coil pack going bad? [Re: NavyVet88]
Old Mustang Guy Offline


Registered: 11/16/05
Posts: 967
Loc: Rockwall, Texas
When I had a coil pack going out the car still started fine but ran rough.

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#4679597 - 02/27/18 11:01 AM Re: Coil pack going bad? [Re: mightymousetech]
NavyVet88 Offline


Registered: 09/27/15
Posts: 515
Loc: Alabama
Originally Posted By: mightymousetech
If it is only after sitting for a couple days, I would think the fuel pressure is not being maintained in the system when off. Could be a bad check valve in the fuel pump assembly. Try turning the key to the on position a couple times before starting to let the fuel system prime.


Well the car only gets driven a couple times a week for groceries and such or quick errands. I failed to mention in my opening post that once the engine does start, it struggles to get going unless you press the gas pedal a bit to help it.
_________________________
2013 Honda Civic LX 1.8L 127k M1 EP 0w20 with Fram XG7317
2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A

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#4679598 - 02/27/18 11:03 AM Re: Coil pack going bad? [Re: NavyVet88]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: NavyVet88
Originally Posted By: mightymousetech
If it is only after sitting for a couple days, I would think the fuel pressure is not being maintained in the system when off. Could be a bad check valve in the fuel pump assembly. Try turning the key to the on position a couple times before starting to let the fuel system prime.


Well the car only gets driven a couple times a week for groceries and such or quick errands. I failed to mention in my opening post that once the engine does start, it struggles to get going unless you press the gas pedal a bit to help it.


Could be just plugs. When were they replaced last?


Edited by mightymousetech (02/27/18 11:04 AM)
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#4679608 - 02/27/18 11:15 AM Re: Coil pack going bad? [Re: mightymousetech]
NavyVet88 Offline


Registered: 09/27/15
Posts: 515
Loc: Alabama
Originally Posted By: mightymousetech
Originally Posted By: NavyVet88
Originally Posted By: mightymousetech
If it is only after sitting for a couple days, I would think the fuel pressure is not being maintained in the system when off. Could be a bad check valve in the fuel pump assembly. Try turning the key to the on position a couple times before starting to let the fuel system prime.


About 6 months ago. Oem plugs to boot.
Well the car only gets driven a couple times a week for groceries and such or quick errands. I failed to mention in my opening post that once the engine does start, it struggles to get going unless you press the gas pedal a bit to help it.


Could be just plugs. When were they replaced last?


About 6 months ago. With oem plugs.


Edited by NavyVet88 (02/27/18 11:16 AM)
_________________________
2013 Honda Civic LX 1.8L 127k M1 EP 0w20 with Fram XG7317
2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A

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#4679610 - 02/27/18 11:17 AM Re: Coil pack going bad? [Re: NavyVet88]
NavyVet88 Offline


Registered: 09/27/15
Posts: 515
Loc: Alabama
Could it be the throttle body?


Edited by NavyVet88 (02/27/18 11:17 AM)
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2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A

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#4679624 - 02/27/18 11:26 AM Re: Coil pack going bad? [Re: mightymousetech]
BurrWinder Offline


Registered: 09/26/12
Posts: 176
Loc: WI
Originally Posted By: mightymousetech
Originally Posted By: NavyVet88
[quote=mightymousetech]If it is only after sitting for a couple days, I would think the fuel pressure is not being maintained in the system when off. Could be a bad check valve in the fuel pump assembly. Try turning the key to the on position a couple times before starting to let the fuel system prime.


Well the car only gets driven a couple times a week for groceries and such or quick errands. I failed to mention in my opening post that once the engine does start, it struggles to get going unless you press the gas pedal a bit to help it.




I have a feeling that you most likely have a leaking fuel pressure regulator on the fuel rail, this is a fairly common problem on these engines and is easily diagnosed - remove the vacuum hose going to it on the fuel rail and inspect for any raw fuel vapors / liquid coming out of the regulator ( or filling the vac. line, if failed bad enough ) Just key up the vehicle ignition, ( cycle on but don't start car ) a few times after sitting ( for a bit )
with the vacuum line off... any liquid fuel that comes out and it is automatically a failed part.

The result of this is hard starting as it is too rich from the leaking fuel from the regulator, causing a hard start.

I would put a large bet on this being your failure, esp. at the miles accrued and if it never has been replaced before...

BurrWinder

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#4679630 - 02/27/18 11:31 AM Re: Coil pack going bad? [Re: BurrWinder]
NavyVet88 Offline


Registered: 09/27/15
Posts: 515
Loc: Alabama
Originally Posted By: BurrWinder
Originally Posted By: mightymousetech
Originally Posted By: NavyVet88
[quote=mightymousetech]If it is only after sitting for a couple days, I would think the fuel pressure is not being maintained in the system when off. Could be a bad check valve in the fuel pump assembly. Try turning the key to the on position a couple times before starting to let the fuel system prime.


Well the car only gets driven a couple times a week for groceries and such or quick errands. I failed to mention in my opening post that once the engine does start, it struggles to get going unless you press the gas pedal a bit to help it.




I have a feeling that you most likely have a leaking fuel pressure regulator on the fuel rail, this is a fairly common problem on these engines and is easily diagnosed - remove the vacuum hose going to it on the fuel rail and inspect for any raw fuel vapors / liquid coming out of the regulator ( or filling the vac. line, if failed bad enough ) Just key up the vehicle ignition, ( cycle on but don't start car ) a few times after sitting ( for a bit )
with the vacuum line off... any liquid fuel that comes out and it is automatically a failed part.

The result of this is hard starting as it is too rich from the leaking fuel from the regulator, causing a hard start.

I would put a large bet on this being your failure, esp. at the miles accrued and if it never has been replaced before...

BurrWinder


Thank you sir I will check this this weekend when off work.
_________________________
2013 Honda Civic LX 1.8L 127k M1 EP 0w20 with Fram XG7317
2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A

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#4679660 - 02/27/18 12:16 PM Re: Coil pack going bad? [Re: NavyVet88]
Old Mustang Guy Offline


Registered: 11/16/05
Posts: 967
Loc: Rockwall, Texas
When I had a throttle body go bad the symptoms were in fact like you describe.

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#4679720 - 02/27/18 01:47 PM Re: Coil pack going bad? [Re: mightymousetech]
CT8 Offline


Registered: 10/09/14
Posts: 10967
Loc: Idaho
Originally Posted By: mightymousetech
If it is only after sitting for a couple days, I would think the fuel pressure is not being maintained in the system when off. Could be a bad check valve in the fuel pump assembly. Try turning the key to the on position a couple times before starting to let the fuel system prime.
This is where to start trouble shooting.
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#4679726 - 02/27/18 01:53 PM Re: Coil pack going bad? [Re: NavyVet88]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1722
Loc: Alberta
Originally Posted By: NavyVet88
2003 Buick Century 3.1L

Here lately ive noticed that first starting the car after a few days without running, the car is temperamental about starting. By that I mean it takes two or three tries to get it started. The engine turns over just fine, but it doesn't actually start until mostly the 3rd and sometimes 4th try.

The motor was replaced about a year ago(used of course) just after I got the car and it was starting just fine at the time. Battery was replaced at the same time. Is this a coil pack going bad?

Thanks guys,


How old do you think those sparkplugs in the used engine were? Maybe pull and plug and have a look. Spark plug wires also eventually should be changed. Spray a bit of water on the coil pack to see if there are cracks in the coil pack that you might be able to short out as evidence of a problem.





Edited by Snagglefoot (02/27/18 01:55 PM)

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#4679772 - 02/27/18 02:50 PM Re: Coil pack going bad? [Re: NavyVet88]
bubbatime Offline


Registered: 03/18/08
Posts: 5622
Loc: South Florida
Throttle body
Fuel pressure
MAF sensor
fuel pressure regulator
leaky injector

Thats what I would look into
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#4679821 - 02/27/18 04:44 PM Re: Coil pack going bad? [Re: NavyVet88]
Chris142 Online   content


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
Fuel pressure regulator.
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