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Hello i have a 97 chevy with the vortec 5.7 when my truck sets overnight first start it knocks really bad and gets louder the faster i go until truck is warmed up then goes away i use a high quality oil filter and have been told several things i tried doing some research and just cant narrow it down i cant afford to take it to the shop gotta fix myself any ideas to what it could be

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  • Cars & Trucks Master
  • 2,002 Answers

Locate the sensor for the oil light. It should be on the back of the block roughly in the center, I believe. Either T into it or replace it with a mechanical oil pressure guage. This will likely tell you that your oil pressure is low, especially when cold.New pressure is 30-35 PSI. My suspicion is that you are below 20 PSI which would be normal for high mileage or abuse by a previous owner. If the pressure is down near this,20PSI, then it is time to start looking at either a rebuild or replace. You could prolong it by going to a heavier oil, either 15W40 or maybe even 20W50. They will provide extra lubrication and make the noise go away. If you live in a cold climate, I would suggest a block heater with these oils.

Posted on Nov 15, 2014

  • 6 more comments 
  • Josh j Nov 16, 2014

    Its got 20 when warm bout 60 when cold i checked my oil pressure its good i wonder is it a lifter i havent checked dont have the time its my daily driver and need this truck

  • cy schousboe Nov 16, 2014

    That is a possibility. Use a stethescope or a really long screwdriver and listen to the engine on start up. Place it in at the joint of the head and intake top get as close as possible to the lifter. It will have a distinctive tic,tic,tic, to it. Not a serious problem, more of an annoyance,

  • Josh j Nov 16, 2014

    I have noticed that when it sets over night start in the morin it tics really loud and gets louder as i drive until truck warms up then it goes away i havent been running synthetic oil do i need to

  • Josh j Nov 16, 2014

    When i place the screwdriver do i have to pull the valve covers or anything ive never done that before so im a little confused

  • cy schousboe Nov 16, 2014

    Synthetic oil won't make any difference for a leaking lifter, but heavier oil will help. It won't leak down as fast but when it does it will take longer to fill if it's cold, around 0*. No special tricks to the screwdriver , just touch it on the blocck, no need to remove valve cover. Be VERY CAREFUL: when your face gets to the front of the engine, that fan is very unforgiving and can start anytime. That's why I said a long screwdriver, mine is about 16 inchs long, used to use it for adjusting carbs.

  • Josh j Nov 16, 2014

    Im running 10w40 already and still ticks. What will the screwdriver do its my first time hearing this just wanna make sure i do it right

  • cy schousboe Nov 16, 2014

    The screwdriver acts like an amplifier. With your ear on one end and the other on the block your will be able to hear exactly which lifter is the bad one or if it is a lifter.The bad one will be making a tic, tic, tic, sound which will be different than the rest of them. Check both sides. If there is no difference in sound with all the lifters, there are 16, 2 per cylinder lining up with the spark plug and the exhaust port, then the problem is all the lifters or none of the lifters.You will hear noise from the good ones it just won't be the ticking noise.

  • Josh j Nov 16, 2014

    Thanks ill definitely check that

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Posted on Jan 02, 2017

  • 64 Answers

SOURCE: i have a 96 chevy

your problems might be internal with the piston rings in the motor,its probably due to age-you took all the correct steps,check compressions and were that takes you.hope that helps you out
good luck!

Posted on Nov 05, 2010

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