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Are putting some oil in the cylinders after doing a dry test? Take the plugs out and ground them to test the ignition, 125 psi is considered low for those engines. Look up a manual to see specs for compression wet and dry. A valve could have burnt up dropping compression, coolant low? I'd just...

Can you remove the oil cap when you have the gauge on a cyl that has low compression? Do you hear air leaking? Maybe I should ask if you have a gauge that hooks to a air compressor then pressurizes the cyl first lol. If you have just a gauge that measures compression when cranking then you won't...

Carbon build up on the valves, not seating correctly or the head gasket is leaking a bit.

Remove the cover and replace

Yes it will bolt up the same, its the same engine just swap over exhaust manifold.

Check timing?

2 or 3 bolts through the pulley, you might need to have a wrench on the long bolts coming from the back of the pump along the engine block. It's tight but find the right combo of sockets and small extension and you'll be able to loosen them.

When it doesn't start do this next time. Turn key on after it doesn't start, do you hear a faint humming coming from the back for about 2-3 seconds? If not then fuel pump is going bad, replace distributer components, new cap rotor, igniter ect ect, I'm not sure what parts go bad on that engine...

Replace intake gasket and check intake hose. Also replace the throttle body gasket. You're getting too much air from somewhere and the common is the intake gasket if it's never been done. Could be o2 sensor but you'll need a scanner with live data to see if it's working.

Replace switch on tstat housing. You need a new switch, not sensor.

Codes? Burning alot of fuel? Oil consumption is common with the early 1zzfe vvt-i motors from what I've seen. Try some engine restore 4cyl every oil change along with a synthetic blend oil. If you're handy you can try a piston soak, my remedy was kerosene over night, then marvel mystery oil over...

Downshifting going down a hill then stop and go, does it puff when you step on it? If so valve guide seals. Do a piston soak, marvel mystery oil over night or 2 days then run, kerosene overnight then run, seafoam for a few hours then run. I did that thinking it was the rings but turns out it was...

I've done a piston soak on a 00, I used kerosene in the pistons and oil. Seafoam, gas, mystery oil, combination of gas and kerosene. Worked for me, I currently have a bad head and looked at the walls and noticed hot spots and my buddy told me to use engine restore every oil change along with...

Get a compression tester and test the compression. Mine ran fine then did a whole bunch of work to just come to find that the head was warped and a bad backfire finished it all off as far as compression goes.

Turns out after all the work and a years wait the head was warped, valves burnt and lots of carbon built up in the chamber. New top end has been ordered and all parts are ready to go. Thanks for the help guys.

Still no luck, I disconnected the battery would that clear the limp mode? Still pops through the intake every few revolutions.... Bad Maf?

Swapped out crank sensor and its a no go. Would a maf sensor be bad and cause it not to run?

I checked the lash and they were all within spec. Car ran beautiful before I did the work. I only replaced the valve guide seals cause they were bad on the exhaust side, I replaced everything else after it wouldn't run, so basically I've had this car apart 4 times making sure everything was done...

I'm, getting engine rpm, 500-600rpms, no spark advance in the graph, throttle is showing 20% to 100% when I step on it. O2 sensors are working. But I'm still getting a popping sound from the intake. Car ran fine before I did the work. Compression is fine when I replaced the valve seals there was...

I dropped the alternator cable twice on the frame, the alt fuse blew. How do I test the ecu?