'06 STS V6. Sometimes in the morning when it is approximately 40-50 degrees, the car will try (very hard) to start and it will fail. When I try again, it always works normally with no hesitation or anything. Any idea what is going bad?
I am going to agree with carter's_sts on this one. When is the last time the fuel filter has been changed? If you haven't run injector cleaner through it yet, this would be a good time to do that. Let it consume a tank of treated fuel and see if it still misbehaves.
I had the car in for a 32pt and an oil change at the dealer about 6 months ago. The car has actually been doing this for about 6 months or so, but prior to a couple weeks ago, it had only done it a total of about 4 times. Now it does it every three mornings on average. I just realized, however, that a month ago it did it after sitting for only an hour or two.
No check engine lights ever come on. Even after a failed start.
*Hold the ACC button till the car turns on (Engine off) make sure you hear the pump run for atleast 2 seconds.
*Run a bottle of Injector cleaner through the fuel system, also replace the fuel filter
*Check all grounds, Make sure they are clean and tight. If you have a Digital Volt Ohm Meter (DVOM) check to make sure the resistance between the ECM housing and the battery's negative cable is less than .5 ohms
*If you have an OBDII software that you can read live sensor data (after vehicle has been sitting for a good couple hours) check and see if the IAT and ECT readings are +/- 5 °F within each other
*Check the Fuel Pressure (55-60psi). The fuel pressure will drop when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabalize and remain constant.
*Check the condition of the spark plugs, and make sure no oil or moisture has breached its way into the ignition coil tube.
Hope this helps, If you still can't figure it out I'll be glad to help
So, to report back. I haven't changed anything or really checked anything, but the problem hasn't occurred even once within the last few weeks. Is there any reason why this problem would be intermittent with very long periods between occurrences? Does that rule anything out?
I am tracking this thread for more tips. My symptoms are the same: intermittent failed start, starts on 2nd attempt. No ryhme or reason when it will happen. Cool or colder temps will increase occurance which could mean battery. Fuel system svc'd last month. I have never seen any smoke after second attempt (using remote start).
I will check and eliminate the other items on the list matt provided (I'll have to borrow an OBDII). For me I think it is my battery, I think it is the original. Thanks for the info.
My motorcycle is pretty much the same way. If it has been sitting overnight, it won't start on the first attempt. Second attempt fires right up. Although that is pretty common on my motorcycle. It's just the nature of the beast