LS1Steve

After having an intermittent idle problem (sometimes shuts off at stoplights) and looking over everything, replacing sensors, and a good tuneup, I did a compression test. Results as follows:
Cyl 1 110psi
Cyl 2 45psi
Cyl 3 60psi
Cyl 4 45psi
Cyl 5 150psi
Cyl 6 10psi

Is there anything I can do short of a rebuild? It would cost more than the truck is worth, so I'm not to fond of the idea. Has it run it's course?

Jay351

3.4L swap??

abecedarian

There is the 3.4 swap option, install a lower mileage used engine, rebuild, or install remanufactured. I've seen reman'd from about 1700.
There was an entry on craigslist near me for a 5vze and trans/transfer case for 1500, no harness though.

Jay351

Might be easier to find a wrecked truck and buy the whole shibang.

RMA

1Uzfe , LS 400,s are running around $800-1500 right now , running 120,000-220,000 miles on them .
Ive been looking on craigslist daily, but they are selling quick.

MrPeepers

Have you done a cylinder leakage test? I have seen where one or more valves haven't fully seated due to bad valve adjustment, so the cylinder never sealed. It could be as simple as a valve adjustment. If you have an air compressor, i think Harbor Freight had teh leakage testers for about $20.

SEAIRESCUE

Agree with last post. I suspect there are very few 3.0's that have ever had their valves adjusted because its so difficult to perform and very expensive. If you are not burning oil out the tail pipe, then your valves need adjusting. Over time they retract into the head and loose their very small clearances from the factory. Pack a dam lunch if you try and do it yourself. I suspect the dealer would want at least $500 to do the work. I have used a very large flat blade screwdriver to hold the valve spring down enough to remove the adjustment shims with a magnet. I have had some luck swapping them around, flipped over for a new surface, and getting the valves back in their adjustment clearance ranges.

My $0.02 but been there and done that....

desertcox05

As already stated, a cylinder leak down test is waaay more acurate than a compression test alone. once the combustion chamber is pressurized you'll be able to hear where the air is leaking.

LS1Steve

where should the crankshaft be turned when I leak test a cylinder? I assume top dead center.... easy for cylinder 1 but what about the rest? And I figure I'd have to have the valve covers off to identify the leaks right? This will be my first leak test...

MrPeepers

Here is the one I got. i am pretty sure it was on sale when i got it (they always have sales) but still $35 isn't too bad. Basically hook it up, and remove your oil fill cap and radiator cap. If you see it bubbling and hear it out the radiator, you have a blown head gasket, if you hear it out the oil filler cap it's most likely bad rings, if it's out the exhaust or intake, then it's the corresponding valves.
http://www.harborfreight.com/cpi/cta...emnumber=94190

BTW, yeah TDC for each cylinder. Once you find #1, you can go in firing order and use the distributor to help you verify, the rotor is going to point ot the wire of the cylinder at TDC.

desertcox05

make sure the piston is at the very top of the stroke. if it's not the compressed air will drive it back down. MrPeepers is good on everything else