Ignitoin troubles or ?
Bad battery connetion
SOURCE: Wait 15 minutes to start.
Impalas and some other Chevy products have a system called passlock or passlock II At times they will "sense" an intrusion even if there isn't one (even if you are using your keys). At that point the system locks down the fuel injectors and the car won't start even though everything else seems to work. You can do the same **** that you are talking about, turn the key in the ignition and leave in the ON position 10-15 minutes but who wants to do that all the time, and this always seems to happen at the worst time. If you take it to a dealer they are in most cases prohibited from making changes to factory installed protection systems....SO.....what I did on my Impala was...to disable that portion of it. This will take an hour or two. The dash is held in place with a variety of screws and bolts and you may want to do a web search to determine the placement of them. I just took my time and found mine until I had the dash removed. Under the steering column there is a metal plate that also needs to be removed, held in place with a few bolts. Once that is removed you will see coming up the steering column (3) wires grouped together. They may be tied together or taped together but there should be three. One is gray, one is yellow and I beleive the other is white. The yellow one is the only one you need to concern yourself with for this problem. Make sure that you have electrical tape or something to seal the ends off with (have it with you ahead of time, also wire cutting snips or something similar. This is VERY important. Once you have located this group of wires, START THE CAR, and snip the yellow wire while the car is running. Make sure and do not touch the ends to anything metal and try to seal them off with electrical tape as soon as possible. After that put everything back in place and you are good to go. The Security light will stay illuminated but it is not a problem. You can take the bulb out but it is very complicated and not worth the trouble. When I say security light it is the light to the right side of your control panel and it is either orange or yellow and says SECURITY> the alarm and everything else will function just fine. I did this to my Impala 10 months ago and have never had the not starting problem ever again. For more info on the grouping of wires going up the steering column you can go to a website called BulldogSecurity.com and they have more detailed info...Hope this helps you....!
SOURCE: My chevy blazer doesn't start , i have ignition
after the 15 sec. the gas smell means it could be flooding. when you say you have ignition you mean spark? your fuel pump can still come on and you can hear it, but that doesnt mean its not bad.
SOURCE: 2002 impala intermitenly wont start
I would clean the battery connecters or possibly change them. How old is the battery? sometimes when battery get old, they have enough juice to crank the motor but not enough to start it..But then again, if it doesn't crank at all sometimes, it could certainly be a bad or loose battery terminals..Start with this since its the simplest and easiest and could very well be your problem. hope this helps
SOURCE: 2006 Chevy Colorado doesn't start all of the time.
Did the solution #1 help at all?or did you ever solve the problem?
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The BCM
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The PCM, see important above
Important: This procedure is not available on vehicles equipped with option code (Z49).
If replacing a BCM with an GM SPO Replacement Part, perform the procedure to setup a new BCM prior to the 30-minute relearn procedure.
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