OMG.

You've all heard, when it rains it pours. I found out today that cylinders 3 and 4 have no compression. What amazes me there is no cel. Truck actually was this way when I bought it I assume. I've had it about a year.

Looking for opinions at this point.

My limited shade tree analysis would be valve issues.?

2001 3.0 130000 miles, U vin,

Repairable? yes, no, maybe?

 

If there is no compression on 3 and 4, it must be running pretty rough, even more so at idle _ lack of power too.

With out some compression test numbers is pretty hard to say for sure what the problem is, but probably some burnt valves.

Do the compression test and note what the gauge says.
Now add a bout a table spoon of oil into the combustion chamber and test it again.

If the compression increases, then you have a compression ring problem.
If the compression stays the same as your first test, then it's a valve problem.

Is it using any coolant ?
Any signs of white smoke in the exhaust or coolant in the oil ?
Was it ever over heated at some point ?

 

Not overheated since I've owned it. Uses no coolant. Uses no oil. No coolant in the oil. No white smoke.

ZERO compression. like none, on either cylinder. Wet compression same result. Pulling wires from coil when running on those two makes no change in the way it runs.

Yes, slightly a rough idle...

 

More than a "rough idle"

You would be limping around town if you drove it anywhere.

1/3 of the engine is not working


So start from the beginning
What is the compression on ALL the other cylinders, have to have that for comparison
1
2
3 0 psi

4 0psi
5
6

Fill in the blanks :)

Yes, even with 0 psi you still need a base line
You need to have ALL spark plugs removed for compression test, need good fast crank speed to get usable results

And you need to use a screw in gauge not a "hold in place" gauge

0psi is either a burnt exhaust valve or broken valve spring

Do you remember if engine ever pinged/knocked?
pinging is pre-ignition which is not uncommon with the 3.0l because of 9.3:1 compression ratio and regular gas, 87 octane
Pinging overheats a cylinder which will burn exhaust valves, can even burn a hole in the piston

 

1 128
2 135
3 0
4 0
5 133
6 124

I never heard any knocking or pinging.

 

Not a head gasket issue

Most likely bad valves
Heads will need to come off
When you get valve covers off check the rockers on 3 and 4

 

Trying to post pics of the heads.

 

Here's my heads, I'd like some input.

 

No pics showing.

Click on the advanced button.
Scroll down where it says "Manage Attachments"

Click on the "Browse" button.

I like to resize the pics to no more then 3 or 400 kilobytes if they are bigger then one megabyte.

 

OK.
Here are the heads. I'm wondering why they do look the same. Wht the different colors?