Upon start up, have what sounds like valve train noise
When I first start the car, engine makes rattling noise which sound like valves goes away on accel but you can hear it again when you decel.
After it warms up it almost completely goes away. I use 10 40 penzoil and change it and filter every 3 thousand car has 89000 on it.
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disable each cylinder one at a time. If the noise goes away it is likely a rod knock and is terminal. A new engine is the only way to resolve. If it does not go away than it is possible it is a wrist pin, also terminal, or in the valve train.
if you think it could be in the valve train try this. Add 1/2 can of seafoam motor tune to the oil. Start the car and let it run. If the noise goes away it was a valve train issue. change the oil and make sure you are keeping up with the proper maintenance for you vehicle.
if the noise continues than i would seek a professional ear to listen to eat and give an opinion.
it could be a wrist pin, and im not sure if those amc's had hydraulic lifters but sometimes with old lifters when the oil pressure is lower at an idle the lifters arnt filling up all the way so they develope a little valve lash, and when the rpms are raised the oil pressure raises and fills the lifters. you could try chasing the noise down with an automotive stethoscope.
The "rattling sound" could be a number of things, but if the sound is coming from the upper part of your engine, it is most likey valve train noise. Removal of the valve cover for an inspection would be needed to determine. Make sure your oil level is full and you have the correct grade of oil in your engine. ...i hope this helps.
4.0l's are notorious for valve rattle on cold start-up. There is really nothing you can do to make it go away short of completely replacing the valve train in the top end, and that isn't a permanent fix. It's is an top end oiling issue from the factory. Just don't race your engine on cold start-up until the rattle stops.
The rattle in the transmission sounds to me to be more of a loose dust shield/heat shield around the transmission or exhaust than a mechanical issue.
Check under the hood and inspect the valve cover gasket. If it's bad it would explain why you don't see any leaks on the ground because it's probably burning off on the manifold. This ticking you're hearing is a lack of lubrication to the rocker arms. Apart from the valve cover gasket, you should get under the car and inspect the oil pan and oil filter for seepage. Best of luck on your problem.
This may be due to old oil. I'd first try changing the oil. The viscosity of old oil may be to thin causing serious run off in the top end. All of the lubrication may be off of the valve assembly causing it to chatter and make these noises until the motor can re-lubricate the valve train.
Also, it may be due to low oil, to heavy of a wieght of oil (such as 15w40 or 20x50). I believe with most of the 04's the recommended oil weight is 5w30.
Try an oil change and see if the noise goes away. If it doesn't I'd do a quick visual inspection under the hood for rattling parts while the engine is running. It could just be a loose housing or something causing the noise. Hope this helps bud!