Could be maybe "like" a crank key? Maybe it LOOKS like its turning the cams but it really isn't. Just pull your valve cover.

Happened on my jet ski

 

You said you checked the alignment marks on the cams,,, but have you looked at the marks on the crank. It sounds like it jumped a tooth or two on the crank shaft.

 

That's a good thought Fog...Subscribed, wanna see what this is.

 

Man i am stikin around for this mystery.

 

could be leaking injectors, which would cause no compression by washing all the oil off the cylinder walls, do a flash test. pull out the dipstick walk a few feet from the car and put a lighter under it and, if it poofs, not for a fireball but a little puff of smoke, there is a lot of fuel in your oil, change the oil, and get your engine checked for gas leaks, if it doesnt im still stumped

 

uhm...how bout he doesnt try to blow himself up by lighting his truck on fire........you could just smell the oil??..if there is fuel in there..you will definitely know it..

 

Yikes I am glad I know a little about cars and am not the one taking some of this advice.

If the truck has ZERO compression, in all cylinders, that means something is not spinning. This has nothing to do with bore wash, or any other gibberish like that. Even if the belt is 5 teeth off, you will still get compression and it wont simply free wheel like it is doing. All 6 injectors would have to leak a LOT of fuel, all at once, to make the engine have zero compression.

He said he turned the crank and the cam gears (both) turned as well.

The next obvious step is to take off the valve covers, and be sure the cams are in fact spinning. Many a motor I have seen where the cam seizes and shears off, but the game gear will continue to spin.

Another thing to check is the pin in the cam gear. Was that put back in? Could the cam gear just be spinning on the cam, without the cams even turning? Again, another very common mistake made when the timing belt is done.

 

I agree with GRIND or the motor is toast. doesnt matter if the cams spin or not and etc..--HE HAS ZERO Compression in all 6 cylinders--even if the cam snapped--at least one of the cyl would have some compression. Do the oil trick, test for stuck open injector and then plan on tearing it down.

 

Beat me to it Deathcougar--surpising how complex people want to make an easily diagnosed problem?

Remeber the basics folks--Compression, Fuel, Spark, Boom

 

What about air?

 

x2 on dc's post...



subscribed!

 

if you think your not getting air you could just check the intake for vermin, i agree with hross14 the cams have to be spinning or there would be compression in at least one cylinder, it has to be either VERY low oil level or leaking injectors. did you have the car serviced before you parked it ? what could have effected all the cylinders?

 

how could a cylinder make psi when both valves are always shut or if one is always open?

and what would cause all the valves to do that at once?

 

<<<<MYSTERY SOLVED>>>>
i've owned the truck for about 8 months now and looking at things,previous owner(she owned it since new) really wasnt too habitual on the oil changes....this is the worst i've ever seen.
what happenned is that all the gunk in there stopped up the buckets to the valves preventing them from moving/closing. if you look at the pictures you can see the cam lobes not contacting the lifter bucket's suface due to all the gunk leaving all the top valves in an open position thus,no compression.
i figured,since the weather is cooling in my area and the truck sitting for 2 days made the oil/gunk turn into thick maple syrup consistency and adding much cooler temps turned it into glue....
i guess my initial start that day when the problem arose made the rest of the lifter buckets stick open that's why i lost compression on all 6 cylinders at the same time.....
anyway,i'm pulling the heads and checking the condition of the block,pistons,oil passages and cylinder bores if they are salvageable i'll be slapping in some rebuilt heads...if not,thinking of going JDM and swap out the whole motor.....
i guess i'm still ahead as she sold me this 2000 ltd for $300.

anyways,lesson learned here....change your oil regularly and it's not the same lifetime oil toyota claims for the tranny fluid which was maybe thought of by the previuos owner

oil that turned into "asphalt"...yuck


pic of the valve cover:


motor/head


top of lifter bucket not contacting cam lobe(stuck in open pos'n due to gunk)



$300 truck

 

this happened to another guys motor too!!!!!!!!!! although he still had compression..his was another problem i believe..

but his VC's and his entire motor looked like that on the inside..it as very sad actually..LOL

 

OOOOOmy GoD!!!!!!!!!!!!!!!!!!!

 

Wow..

I mean, that is just amazing. This is my biggest fear with my wife/daughters..............

 

exactly what i said when i openned up the valve cover....doing the drivers side tomorrow-its def. gonna be a double wow. lol

 

Not bad for a $300 truck.. Even if the motor is screwed!

 

the freakin sucks good luck with the teardown