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Old 11-17-2011, 09:24 PM   #1
jeffao
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pontiac g6 start-up issue

Hi. I have a 2005 pontiac g6 gt sedan with almost 60k miles and every now and then, most often when i dont expect it i have a problem starting the car. Ill get in and start it up and the engine will kick like its trying to start and then it will eventually give up and peter-out. Light application of the gas pedal will quickly resolve the issue and it will idle normally. This only happens every now and then, but the majority of the time it starts normally. Anyone know whats going on? Love the car, but it a shame this is happening so early in its life.
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Old 11-17-2011, 10:15 PM   #2
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Quote:
Originally Posted by jeffao View Post
Hi. I have a 2005 pontiac g6 gt sedan with almost 60k miles and every now and then, most often when i dont expect it i have a problem starting the car. Ill get in and start it up and the engine will kick like its trying to start and then it will eventually give up and peter-out. Light application of the gas pedal will quickly resolve the issue and it will idle normally. This only happens every now and then, but the majority of the time it starts normally. Anyone know whats going on? Love the car, but it a shame this is happening so early in its life.
Hard to start when cold, hot or both?

I'd start by cleaning the throttle body & MAF sensor if that hasn't been done.

Could be a fuel delivery issue. I'd want to check the pressure at startup.

Does it turn over normally while cranking or is it a slow crank?

No codes?

No other engine problems? Does it otherwise run ok?

Which engine?

Last edited by greenman; 11-17-2011 at 10:45 PM.
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Old 11-18-2011, 09:30 AM   #3
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Definitely clean the throttle body. You can do it in 30 minutes at home so don't take it to a shop.
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Old 11-18-2011, 01:33 PM   #4
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Cleaning the throttle body (won't be exactly the same but you'll get the idea):


http://www.autorepairfacts.com/repai...vent-problems/

Last edited by greenman; 11-18-2011 at 02:27 PM.
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Old 11-18-2011, 06:19 PM   #5
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thanks for the replies! Greenman - itll do it when its hot or cold out. its the 3.5L v6. Its not really a slow crank, like a weak battery, you can feel the engine trying to start (after turning the key to "start" and releasing it) and you can see it on the odometer. The engine spudders and will eventually give up unless I apply some gas. Ill try to start the car again, after its stopped by itself (or turned the key back to off), and it may repeat the same thing or sometimes itll start back up smoothly. The majority of the time it will start like a brand new car. No engine lights come on at all when it happens. Wish i could catch this on video and show it to you guys.
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Old 11-18-2011, 06:51 PM   #6
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Start with the TB & MAF sensor cleaning.

The Chiltons for G6 has a how-to for removing the MAF sensor. Before removal, get yourself some CRC MAF sensor cleaner at any auto parts joint. Spray the platinum wire/s down thoroughly & let air dry. Then reinstall. Don't touch the fragile wires with anything! Total time is 15 minutes max.

Last edited by greenman; 11-18-2011 at 07:56 PM.
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Old 11-18-2011, 07:32 PM   #7
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Thanks, Ill definitely try that when im off from work, but the weather outside here in Maine is starting to get harsh!
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Old 11-26-2011, 12:31 PM   #8
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Check the air filter too. If pressing the throttle is helping it start then it could be getting choked up a little.
Like everyone else says. cleaning the MAF and the TB is a good idea. You can get cleaners for both.
Wouldn't hurt to check your plugs, Just pull em and read em, chances are they're fine. But at 60K it might be worth the extra effort.
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Old 11-29-2011, 01:00 PM   #9
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Old 12-06-2011, 05:56 PM   #10
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Greenman, is the "chiltons" a repair guide like the "haynes" books? which of the two would you recommend?

Last edited by jeffao; 12-06-2011 at 05:58 PM.
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Old 12-06-2011, 08:22 PM   #11
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