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Author Topic: Intermittent long start-ups...  (Read 1680 times, 14 Replies)
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Blackstar
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« on: March 19, 2017, 02:40:50 PM »

'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
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« Reply #1 on: March 19, 2017, 03:24:53 PM »

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.  Grin Grin ) 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.  Grin
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« Reply #2 on: March 19, 2017, 04:36:12 PM »

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.  Grin Grin ) 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.  Grin

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
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« Reply #3 on: March 19, 2017, 06:11:54 PM »

You do not say how old your battery is.

George
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« Reply #4 on: March 19, 2017, 10:48:17 PM »

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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« Reply #5 on: March 20, 2017, 06:49:49 AM »

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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« Reply #6 on: March 20, 2017, 08:00:47 AM »

...
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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« Reply #7 on: March 20, 2017, 12:18:24 PM »

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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« Reply #8 on: March 20, 2017, 12:21:22 PM »

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
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« Reply #9 on: March 20, 2017, 12:22:32 PM »

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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2012 Acadia SLT, Quicksilver, Silver Acadia Club #30.
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« Reply #10 on: March 20, 2017, 12:25:43 PM »

Shouldn't be much difference. Check the coolant level in the radiator, too. Don't rely on the level in the expansion tank.

Level is good. When I leave work on a cold evening, I can see the Envoy temperature gauge begin to move within the first 1/2 mile and have warm air immediately. The Acadia takes twice this long and much slower getting to operating range. It's livable though because of th heated seats.
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« Reply #11 on: March 20, 2017, 03:42:22 PM »

Level is good. When I leave work on a cold evening, I can see the Envoy temperature gauge begin to move within the first 1/2 mile and have warm air immediately. The Acadia takes twice this long and much slower getting to operating range. It's livable though because of th heated seats.


I agree, my 2012 takes much longer to heat up then my Sierra (has the 5.3 so very likely similar to your Yukon)
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« Reply #12 on: March 21, 2017, 10:44:02 AM »

my 07 is bad about this when i put gas in it.....really annoying
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« Reply #13 on: March 21, 2017, 01:03:21 PM »

my 07 is bad about this when i put gas in it.....really annoying

hard/long starts after refueling is an easy $25 fix.
Its the purge valve.
Will take you about 15 min to change.

the 07s have it behind the Throttle body-
the 09s and up have them next to the throttle body visible from the front of the engine.


If it is indeed the purge valve- and causing hard starts-- it will eventually set the CEL- P0496 I believe will be the code...  (off the top of my head).
There are multiple post on how to replace the part...
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« Reply #14 on: Yesterday at 03:33:43 PM »

thanks for the info will look into it as 1 of the many issues i am dealing with on this thing
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