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Old 03-20-2008, 09:11 PM
Join Date: Mar 2008
Posts: 1
Default engine knock

Hi Guys

I'm new to this sight and thoughtI would try to get some help here. I have an 06 Colorado
3.5 I-5 11000 miles. Running ams oil. I have only owned the truck about 7 weeks. When I start the truck I some times get a lifter noise. It sounds like a deisl. It only lasts a few seconds and goes away. It does'nt do this on every start up only some times. Cold or hot doesn't make any differance. What's the deal?
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Old 03-17-2010, 06:21 PM
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Join Date: Mar 2010
Posts: 3

The colorado with the 3.5L vortec for 06 models, which we have, contain hydraulic lifters. which use oil pressure to maintain constant contact with the rocker arms and the valve rods. you will hear that sound right when you start it up due to the oil not being completely circulated through the engine. now it not happening all the time i have no idea. if you start the truck and let it run for about 15 seconds then shut it off, and immediatly start it agian, you wont hear the sound. hope this helps.
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Old 07-14-2010, 05:58 AM
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Join Date: Jul 2010
Posts: 16
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The best thing to do is have a reliable mechanic look at the car - also check the oil level, if not done so already; the engine may need some minor repair, or a rebuilding; the mechanic can determine that
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Old 07-14-2010, 08:48 AM
in2pro's Avatar
Join Date: Apr 2008
Location: Austin, Texas
Posts: 7,092

Welcome to the Forum,

some lifter noise is normal and as dave65467 pointed out the engine does start dry and takes a few seconds for the oil to pump up.
sometimes the oil will drain down other times not so, so you get the tapping or clatter at start up.
Make sure you are using the correct viscosity of oil for your vehicle and that it is not needing a oil change...
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Old 09-05-2010, 11:10 AM
2wd-K5's Avatar
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Join Date: Jul 2010
Location: salmon arm BC
Posts: 846

try using thinner synthetic oil, the ams oil u use may be too thick and taking a while to get there
1979 2wd k5 blazer- parked and will have engine pulled and original put back in and sold
coming soon: rebirth of an 81 malibu coupe
fast - cheap - reliable: pick 2
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