got2speed

I just replaced the water pump on my 93 300zx n/a....
checked the timing belt but didnt take it off... i put everything back on and together and now it wont start... sounds like theres valve timing problem but just guessing ??? any suggestions...

KasbeKZ

what kind of sound is it?

first thing is first, check for spark. if you didn't touch the timing belt or the tensioner, there's no reason for your valve timing to have just "gone out".

got2speed

like theres no spark ..or the timing is off... just sounds like it wont turn over... i didnt take the timing belt but when i was turning the crank i think i saw it rotate and the cams didnt

Lanoi

your harmonic balancer is spining? or crank sprocket is spining ? but cams r not. Correct??/

got2speed

everytihng is spinning just wont start

got2speed

actually the timing cover is on it so i cant see it ...
but im sure its spinning..

Lanoi

U gotta be sure .. tho. when your turn engine over do u hear like a POP! from exhuast? or it just cranks/turns over ?

KasbeKZ

dude, CHECK spark. saying it's like there's no spark doesn't help. there is a write up somewhere for checking it. you just take a coil pack off, take the plug out, and put the plug back in the coil pack (not installed) and plug the pack in. hold the plug close to the plenum and have someone turn it over. look for an arc. it's very obvious when you see it.

and to get our terms right, "turning over" refers to the engine turning by the power of the starter. firing means making any kind of sound from the exhaust pipe i.e. combustion, and starting/running means the engine is turning on its own power.

got2speed

sorry....its definately not getting a spark... i took out the plug wire and its not getting any spark to the to the plug...the engine is turning ...i took off the timing guard to check it .. there is no pop and everything looks fine..

xpwarrior

Check the contacts on the CAS (silver thing sticking out of the timing cover on driver side). You would have needed to disconnect it to get the timing cover off and if it's not making a good connecting you won't have any spark.

got2speed

thanks i checked the contacts to make sure they were securely fastened and still no spark... anything else?

KasbeKZ

get a multimeter and test your coil pack.

is there just one cylinder that isn't getting spark? or all of them.

did you really check for spark like i said? (on a side note, my method described was flawed. you touch the threads of the plug to the plenum and look for the spark.)

if you didn't check for spark like i said, it could be an injector problem, and probably is if your car is an early '93.

got2speed

all of them ... yeah i checked as you explained i knew what you meant... did previosly on another car...

got2speed

i hooked it up to a tester... its getting power to the positive ... but not getting the pulse to spark the chamber... sorry dont know the terminology

KasbeKZ

did we already tell you to test the PTU and CAS? do that. those are the very most likely causes of a total loss of spark.

got2speed

sorry I just got this car not as familiar with it as others... i know what and where it is but how do i check it other than just disconnecting and reconnecting...

KasbeKZ

alright alright. i'll look up the link for you this time, but you've got to learn how to do this after that. brb

got2speed

thx.. i appreciate the knowledge....

KasbeKZ

i just looked the stuff up and realized i was kinda jumping the gun. check your codes.

http://www.ttzd.com/tech/diagnostictech.html

got2speed

the only code that came up was a fuel temp. sensor circuit ....

got2speed

just checked it a little while ago ... but i didnt think that is what is keeping it from getting a spark

got2speed

so what do i do from here??

KasbeKZ

well, it's possible that your new style PTU is bad. it happens, just not very often. sadly, i have no idea how or where to find out how to test one of those. hopefully zlover can chime in with some better advise because i'm running out of ideas.

are you really sure that you properly checked for spark on each of the 6 spark plugs? this is a much different problem if you're missing spark on one or two than it is if you're missing on all 6.