wals

My 85 300zx failed the hydro carbons on the emission test, anyone have this problem ?

NismoPick

By how much?
Does the car run good? Any sputtering / misfires?
Does the car have a cat?
What is the timing set to?

Try a tune up & adjust down the timing if needed.

wals

Thank you for the reply, the hyro carbons were at 3.85. 2.0 was passing. the car seems to run fine,but would guess it could use a tune up,will try that, thanks again.

NismoPick

And the timing.........

wals

Haven't check timing yet, have to wait for my friend to bring his timing light. but seeing how you brought up the timing twice, that will be definately be on the top of the list.. thanks again for the input.

NismoPick

It is important, because (barring some major problem w/ the motor) you can retard the timing and usually get the motor to pass. If the shop you take it to is cool, ask them to run an emissions test in just monitor mode so you can adjust some things & see the difference in real time.

Niku-Sama

Wals, what state is this in?

2.0 seems high thats all i am askin, but its been some time since i smogged any thing

domsgarage

ill tell you what i did.

i plugged the vacuum lines coming off of the emissions control unit.

it passed. every time.

wals

thanks for the feedback from everyone. I'm in N.W. Indiana, still haven't giving up trying to fix it myself, good learning experience.