Question about 1999 Chevrolet Silverado 1500

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I have a 99 Chevy Silverado 4.8 and I just had some work done to remove a broken exhaust manifold bolt and I mentioned to the mechanic that it was running like it had a blockage some where, wasn't shifting gears (automatic) right with the RPM's, it was running, point A to point B good enough. The mechanic then also rebuilt the heads, had clogged catalytic converters, knock sensors rusty, had issues with a lifter on #6 which the rocker pivot was bad but now know why and after replacing the pivot the roller lifter is still ticking. I found out that this motor 4.8 vortec has piston issues. My question is (just so i can verify what this mechanic is telling me) that I should buy a new engine block, like a 2004 that doesn't have this piston issue, like the early Vortec engines.

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  • mstrjhn Nov 15, 2010

    Maybe I misunderstood him, I guess the whole bottom of the motor and just use the top half of the existing one. He told me that you cant replace the pistons without pulling the motor, plus now it has a bad missfire, this is what he told me::
    well I am having issues with a lifter on #6 which the rocker pivot was bad but now know why !
    after replacing the pivot the roller lifter is still ticking (which means it is not pumping up they are hydraulic)
    which is probably the one that was ticking through the bad exhaust manifold to begin with

  • mstrjhn Nov 15, 2010

    I have to go take my wife to work, my direct email...mstrjhn@yahoo.com if you want to send me another answer. I'm going to approve your answer

  • mstrjhn Nov 15, 2010

    not really but he tried and was a little helpful for me to make a decision on a new motor or half of a new motor

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If you're going to replace the block,I would do the whole thing.What good is it really to replace the block but keep the same parts internally?Is that what you mean?I think so.If the ticking isn't too bad or loud,you should just let it go until something happens.Get AAA PLUS.AAA regular only tows 5 miles and you have to pay the rest towing.AAA PLUS tows up to 100 miles free for only about $20/year more.Insurance roadside assistance is the absolute worst coverage and will cause your insurance to go up from towing alone,but they DON'T TELL YOU THAT.Also,they only tow to nearest shop.$9 every 6 months is a ripoff/JOKE.Replacing anything drive-related is always better than rebuilding.It costs a little more but lasts so much longer.Rebuilding longevity can be horrible and replace will have some kind of warranty.Maybe only a year but better than nothing.Rebuilding head isn't too bad.My experiences and friend/relatives,all or nothing,basically.Same for transmissions.Rebuilt or used is the worst.My intentions on this site are to inform and educate.If you have any questions/comments,write here and I will get an autolink to your post and reply ASAP,and do not approve/disapprove until completely done,if you want a response because that cuts off communication between us.Greg

Posted on Nov 15, 2010

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Ticking noise coming from the manifold? There are two types of manifold....1. Instake manifold and exhaust manifold. Please indentify and apply as needed.

Intake manifold
1. Double check the nuts and bolts around the intake manifold if you worked on it and had it serviced.
2. Spark plugs loose. Yes!! I've seen this before and it comes the rear of the manifold..very confusing.
3. Check your valves and have them adjusted. (This will require a trained and qulified mechanic).
4. Check your motor oil and power steering pump fluid.

Exhaust manifold
1. Check for loose nuts and bolts.
2. Check the O2 sensors connections...some models have 2-3. They are the sensors sticking into the pipes.
3. Your catalytic converter may have a defect. If possible, remove it and shake it to determine failure. (I've seen and experienced the so called honeycomb inside it breakign apart.)
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How do i get the thermostat on a 99 chevy lumina


I would assume, since you did not bother to mention, that you are talking about a 3.1L V-6 engine? Why would you think that the intake manifold would have to come off? The exhaust cross-over pipe and heat shield is what is in the way. The heat shield comes off of the crossover pipe rather easilly. This provides a little clearance. The lower thermostat housing bolt does not have to come all the way out. It just has to be unscrewed far enough to get the housing up and over the thermostat. The hole in the lower end of the housing is slotted. It is a real pain, but the only thing that I have found that works is a box-end wrench (one tiny turn at a time). Other than that, the easy way is to remove the exhaust crossover pipe. However, I do not recommend trying this unless you have a torch to heat the nuts that hold it on (unless you feel like replacing broken studs).

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How to replace water pump on 1991 pontiac quad 4


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  3. Properly drain the engine coolant into a suitable container. Remove the heater hose from the thermostat housing for more complete coolant drain.
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  5. Remove the exhaust manifold mounting nuts from the cylinder head. chevy_cav_02-04_exmanifold.gif

  6. Remove the exhaust manifold.
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  8. Check for cracks, broken flanges and gasket surface damage.
  9. Use a straight edge and a feeler gauge. If the flanges or the mating surfaces do not align, the manifold is warped and should be replaced.
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NOTE: The manufacturer recommends using new exhaust system nuts.
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    Exhaust flex decoupler 87953056.gif

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Exhaust manifold 2.4L 87953055.gif

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