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[Randy hamilton]

Thanks.
I just drove the vehicle on a 2000 mile road trip with no issues. Gas mileage as expected or slightly better for a V6 and a loaded vehicle at approximately 4600lb gross.
Seems to have been a testing failure rather than an engine component failure.

[Randy hamilton]

I would do a routine compression test on ALL cylinders for comparison.
All should be greater than 100psi and within 15% of each other.

Injector issues maybe. Run a top quality injector cleaner through it.
The black crud build up suggests blowback potentially.
Have you considered the ECM?

[Randy hamilton]

Compression tested ~150 psi on all cylinders today (cold)

Unclear why the low reading several days ago. Perhaps a sticking valve or ring.

[Randy hamilton]

Cyl #1 – 150 Engine Warm
Cyl #3 – 150 Engine Warm
Cyl #5 – 153 Engine Warm (rear driver side) not tested hot

Doesn’t seem to be consuming oil or water

[Randy hamilton]

The motor is already completely out of the car and disassembled.

Thanks.

Will use my internal mics to do the best I can to check for warpage before rebuilding.

I also have som nice hones I can use to see if there’s any oddness in the cylinders.

Taking the block to be bored, vatted, checked etc can get expensive. But then so is building a bad motor I suppose.

• This reply was modified 3 years, 5 months ago by Randy hamilton.
• This reply was modified 3 years, 5 months ago by Randy hamilton.

[Randy hamilton]

Piston rings is my prime suspect.

As mentioned, the compression was very consistent across the 4 cylinders….but low.

I would have expected some compression discrepancy if the head was warped.

My only other big concern is warping of the block.

[Author]

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