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Coldblooded k5 starting worries

  #1  
Old 11-01-2009, 10:13 PM
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Default Coldblooded k5 starting worries

I have in 83 k5 blazer w/5.7 350, edelbrock intake, edelbrock 625 carb, magnaflow exaust, new plugs wires distributer, and recent tuneup. I know these trucks are notoriously cold blooded but mine seems to be a little bit over the top sometimes. Before I try to start it I pump the gas peddle 3 times, turn the key, it fires once then dies. I usually repeat this 2-3 times and pump the peddle a little bit. I then warm it up for a minute then it idles, runs, and starts perfectly the rest of the day. A freind of mine says that's a sign of worn out rings which freaked me out a bit because I don't think I'm comfortable changing the rings myself and imagine it's expensive. Any ideas or advice???
Thanks. Matt
 
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Old 11-02-2009, 08:08 AM
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You could run a compression test to assess the rings. You can also do a cylinder leak down test to see if you may have problems with worn valves.

Cold blooded running can often be a problem with how the carb is setup. You may have a problem with the idle speed, an overly restrictive choke, or the carb being too rich on the idle circuits. This can also be caused by the timing being off.

The choke blade should not be 100% closed when the engine is cold. It should have roughly an 1/8" gap at the front of the choke horn. If that is closed all of the way, then it definitely can impact your cold starting/running performance until the coil warms up (assuming electronic choke). This would be where I would start.
 
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