Intermittent long start-ups... - GMC Acadia Forum: AcadiaForum.net
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post #1 of 18 (permalink) Old 03-19-2017, 02:40 PM Thread Starter
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Intermittent long start-ups...

'12 Acadia SLT with about 135,000km. Just bought it used last summer and it is a beautiful vehicle to drive. Noticed over the winter that sometimes when I get in to start her up the engine seems to crank over forever before it fires up. I have even tried turning the ignition on until the fuel pump clicks off with full pressure and it will still crank and crank before firing up.

Sometimes I can get in and she might turn over 3 or 4 times and runs. Haven't checked the plugs yet but was wondering what options I have on what to check. I saw that a dirth throttle body might cause this. Is there something obvious I can check?

Other than this the Acadia runs flawlessly, is easier on fuel than my '02 Envoy but does take a little longer to heat up.

Glenn

2012 Acadia SLT, Quicksilver, Silver Acadia Club #30. <br />2002 Envoy SLT, Pewter<br />1993 Harley Davidson FLHTC, Black
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post #2 of 18 (permalink) Old 03-19-2017, 03:24 PM
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Re: Intermittent long start-ups...

I don't think you have much of a problem. The colder it is outside, the harder it is to start an engine. Be thankful the engine isn't a diesel!! (I hate the smell of ether in the morning. ) The mileage doesn't suggest a need for new plugs - those are good for at least 100k miles (160K km). You could give the throttle body a cleaning - wouldn't hurt anything. Make sure the air filter is good, too. Maybe put a can of injector cleaner in the fuel tank the next time you fill it. Most of all, don't worry about it!! The season is changing.

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post #3 of 18 (permalink) Old 03-19-2017, 04:36 PM Thread Starter
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Re: Intermittent long start-ups...

Quote:
Originally Posted by Speleos
I don't think you have much of a problem. The colder it is outside, the harder it is to start an engine. Be thankful the engine isn't a diesel!! (I hate the smell of ether in the morning. ) The mileage doesn't suggest a need for new plugs - those are good for at least 100k miles (160K km). You could give the throttle body a cleaning - wouldn't hurt anything. Make sure the air filter is good, too. Maybe put a can of injector cleaner in the fuel tank the next time you fill it. Most of all, don't worry about it!! The season is changing.
Thanks Speleos. I forgot to mention that I had already run a can of injector cleaner through with no change. I'm not sure it's just the cold because it isn't a constant problem. Probably every 5 or 6 starts... maybe more or less. The other day while it was turning and turning over, just out of curiosity I depressed the accelerator slowly and the cranking stopped. I thought the engine was running but the tach showed 0 rpm. Restart was like a normal start.

I will check the air cleaner.

Glenn

2012 Acadia SLT, Quicksilver, Silver Acadia Club #30. <br />2002 Envoy SLT, Pewter<br />1993 Harley Davidson FLHTC, Black
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post #4 of 18 (permalink) Old 03-19-2017, 06:11 PM
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Re: Intermittent long start-ups...

You do not say how old your battery is.

George

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post #5 of 18 (permalink) Old 03-19-2017, 10:48 PM
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Re: Intermittent long start-ups...

on this vehicle

there are 2 pumps.

It also seems that the start sequence takes a little longer than your previous model (in my case- my 2003 Trailblazer) it does indeed seem to fire up a little faster than my Traverse.


The reason is- that the pump in the tank pushes the fuel towards the front---
then the high pressure fuel pump in the front has to pump and pressurize the fuel to some high number- then the computer says- OK, min pressure met... ok to start...

In your case- Im wondering if something is happening where the pressure is not building up and youre getting that delay.....
Fuel pressure test

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post #6 of 18 (permalink) Old 03-20-2017, 06:49 AM
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Re: Intermittent long start-ups...

or a leaky fuel injector is allowing pressure to bleed off. Are the long starts random or usually only after it sits overnight. I had this issue with a Blazer many years ago. New injectors corrected the problem.
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post #7 of 18 (permalink) Old 03-20-2017, 08:00 AM
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Re: Intermittent long start-ups...

Quote:
Originally Posted by Blackstar
...
Other than this the Acadia runs flawlessly, is easier on fuel than my '02 Envoy but does take a little longer to heat up.
Shouldn't be much difference. Check the coolant level in the radiator, too. Don't rely on the level in the expansion tank.

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post #8 of 18 (permalink) Old 03-20-2017, 12:18 PM Thread Starter
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Re: Intermittent long start-ups...

Quote:
Originally Posted by GeorgeC
You do not say how old your battery is.

George
Just replaced the battery this past August. Nothing wrong there. She turns over fast but for a lot longer than I feel is needed

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post #9 of 18 (permalink) Old 03-20-2017, 12:21 PM Thread Starter
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Re: Intermittent long start-ups...

Quote:
Originally Posted by rbarrios
on this vehicle

there are 2 pumps.

It also seems that the start sequence takes a little longer than your previous model (in my case- my 2003 Trailblazer) it does indeed seem to fire up a little faster than my Traverse.


The reason is- that the pump in the tank pushes the fuel towards the front---
then the high pressure fuel pump in the front has to pump and pressurize the fuel to some high number- then the computer says- OK, min pressure met... ok to start...

In your case- Im wondering if something is happening where the pressure is not building up and youre getting that delay.....
Fuel pressure test
That sounds like it could be a cause. I'll see if I can get the guy to run a pressure test next oil change. Coming up soon.

Thanks for the tip rbarrios...

Glenn

2012 Acadia SLT, Quicksilver, Silver Acadia Club #30. <br />2002 Envoy SLT, Pewter<br />1993 Harley Davidson FLHTC, Black
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post #10 of 18 (permalink) Old 03-20-2017, 12:22 PM Thread Starter
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Re: Intermittent long start-ups...

Quote:
Originally Posted by divotdug
or a leaky fuel injector is allowing pressure to bleed off. Are the long starts random or usually only after it sits overnight. I had this issue with a Blazer many years ago. New injectors corrected the problem.
My wife drives it more than me but I'm gonna say first start up in the morning

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