Question about Chevrolet Avalanche

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I have a starting issue with my 2003 AValanche 1500 w 5.3 L. It has 137K. After sitting I have to crank for extra 5 to 7 seconds before it chugs to life. Has rough idle as well. Somewhat of a "rich smell" after it finally starts. This just started in the last 4 days. No Codes. Tune up done in last 10K...new fuel pmp, filter, etc in last 5K miles. Any ideas?

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Hi! Pretty much a spark plug problem. If the spark plugs are faulty or full of carbon the fuel will be hard to burn, one good reason for hard starting. Try replacing the spark plugs and I strongly suggest to put a platinum spark plugs for better fuel burning. Hope this helps and thank you for using FixYa!

Posted on Sep 17, 2010

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Posted on Jan 02, 2017

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http://vatspasslockpasskeysecurityhelp.yolasite.com/

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Hi,
The best thing to do here is to have the ignition system checked over with a Consult II diagnostic tool. You could have problems with the following: 1. The Crank angle sensor. 2. The Cam angle sensor 3. The ignition module. 4. The ignition control module 5. The coils them selves, but this sounds like it is a signal problem to these not the actual coils themselves.
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