Low compression

[wtxHD]

I have a 2002 ford ranger 3.0 manual Gas. I’m looking into an engine right now for $1K because I can’t figure out what’s wrong with my engine anymore. I have a cylinder 4 and 6 misfire. I did compression on all my cylinders and all of them were good besides 6. Cylinder 6 had 75 psi and every other one had like 130psi. I’ve replaced wires, coil pack, spark plugs, maf sensor and I still can’t figure out why I have a misfire in cylinder 4.I did a wet compression test on cylinder 6 and it only went up to 90psi. Any suggestions or should I just buy a new engine.

 

[wtxHD]

I have a 2002 ford ranger 3.0 manual Gas. I’m looking into an engine right now for $1K because I can’t figure out what’s wrong with my engine anymore. I have a cylinder 4 and 6 misfire. I did compression on all my cylinders and all of them were good besides 6. Cylinder 6 had 75 psi and every other one had like 130psi. I’ve replaced wires, coil pack, spark plugs, maf sensor and I still can’t figure out why I have a misfire in cylinder 4.I did a wet compression test on cylinder 6 and it only went up to 90psi. Any suggestions or should I just buy a new engine.

Incase anyone needs to know the miles are 198K so yeah if any information or testing I can do just let me know. If you think that I should just get the new engine I will. It’s tested already and works well. It has about 150K miles.

 

[mtnrgr]

It could be in the heads as 2002-2004 3.0's had issues with the valves or valve seats. The next step should be to remove and inspect the heads and all the valves and valve seats to look more into the engine.

 

[wtxHD]

It could be in the heads as 2002-2004 3.0's had issues with the valves or valve seats. The next step should be to remove and inspect the heads and all the valves and valve seats to look more into the engine.

What exactly should I look for when I remove the head covers