I don't know exact location. What is bothering me is the same thing happened in a 1997 Sunfire I had and I had to have some kind of mounts replaced and it was very costly. I am trying to figure out what they were called and I can't remember! I'm thinking it was something to do with the control arms, but the internet says that's the rear of the car. I know it has something to do with the suspension, or the tie rods, or something, and that Sunfires are notorious for this happening.
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Re: Rattle in 2005 Sunfire
Have you tried jacking it up and pushing and pulling on the wheels to try to get a noise theres probably more going on but it could be something simple as just a loose nut or bolt. u can check your mounts by applying the hand brake and in gear give it a little gas have some one check to see if they are having to much movement
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The actual compression # you see is not as important as that they are all within 10-20% of each other. (I like seeing from 5-10% but that's not always the case) Generally you will see from 90-120psi.but the readings all should be similar. If one cylinder is way lower than the rest, (as in, one at 60, the remainder at 100) you have a problem. If two adjacent cylinders read low, having nearly the same reading, chances are you have a blown head gasket between them. If you find coolant on any plugs when you remove them, don't bother with a comp test, the head needs to be removed. When doing any head work, always have the head dye tested for cracks and checked for flatness. Never tear an engine down hot or things will warp. (head, manifolds etc).
If it just does it when cold it's piston slap. GM made the skirts shorter to save weight and metal so until they warm up and expand in the walls your piston sill "rattle around" in the sleeve of the block making a "ticking" sound. This is normal but annoying.
If it continues when warm it could be a number of things too numerous to mention.
Try adding Lucas to your engine oil on the next service and see if it goes away.
Switching to a higher grade fuel may also solve your issue. Both cheap fixes.