Hi everyone!
I'm back asking for help from you gurus. Any help or direction would be great.
My truck, 95 Burb k2500 5.7 tbi, has a rattle under the hood under light load only. Not in netrual, can't power brake high enough to make it to do it, but between 1300-1600 rpm it sounds like a valve is rattling. It has developed in the past 100 miles, not directly after but I did put it through a weekend of towing about 500 miles. Truck has 166k miles.
At first I thought it was a belt tensioner, then saw the water pump was leaking so replaced both of those, I went ahead and replaced plugs and wires, it's got good looking oil and normal levels. I also changed the icm and coil for the hell of it. No change.
I pulled the serpatine belt off to see if it made the noise go away. Noise is still there, same rpms. I pulled the driver's side valve cover off and tried to wiggle each rocker, there was nothing obvious. I had a stuck rod and a bent pushrod in a CJ7 once but I don't know squat about tearing apart motors and how things should be but I'm trying to learn. I pulled the valve cover off the passenger side thought I found a loose rocker arm, or slightly more wiggle. So I watched a few videos and tried to adjust the valves on passenger side. Opened them up until clacking and slowly closed it until clacking stopped then a hair past that. Maybe half a turn.
This seemed to make zero difference.
I don't know what to do next. This is my main way to haul my family so I'm trying to fix it right. Most mechanics here are 6 weeks behind and that's a long wait. Any ideas what to check next? This just recently developed not after any changes. Just a weekend of towing then a week later I notice this weird rattle. Thanks in advance.
I'm back asking for help from you gurus. Any help or direction would be great.
My truck, 95 Burb k2500 5.7 tbi, has a rattle under the hood under light load only. Not in netrual, can't power brake high enough to make it to do it, but between 1300-1600 rpm it sounds like a valve is rattling. It has developed in the past 100 miles, not directly after but I did put it through a weekend of towing about 500 miles. Truck has 166k miles.
At first I thought it was a belt tensioner, then saw the water pump was leaking so replaced both of those, I went ahead and replaced plugs and wires, it's got good looking oil and normal levels. I also changed the icm and coil for the hell of it. No change.
I pulled the serpatine belt off to see if it made the noise go away. Noise is still there, same rpms. I pulled the driver's side valve cover off and tried to wiggle each rocker, there was nothing obvious. I had a stuck rod and a bent pushrod in a CJ7 once but I don't know squat about tearing apart motors and how things should be but I'm trying to learn. I pulled the valve cover off the passenger side thought I found a loose rocker arm, or slightly more wiggle. So I watched a few videos and tried to adjust the valves on passenger side. Opened them up until clacking and slowly closed it until clacking stopped then a hair past that. Maybe half a turn.
This seemed to make zero difference.
I don't know what to do next. This is my main way to haul my family so I'm trying to fix it right. Most mechanics here are 6 weeks behind and that's a long wait. Any ideas what to check next? This just recently developed not after any changes. Just a weekend of towing then a week later I notice this weird rattle. Thanks in advance.