jasongeek

My zfailed CA smog I expected this however the guy said the timing was at 16 and it needs to be at 8 I ordered a timing light and it should be here next week howeve I have no clue on how to adjust the timing can someone help???

NismoPick

Haynes manual ...
FSM ...
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Click: https://www.zdriver.com/forums/showt...ghlight=timing

Bleach

Yes, bringing the timing back for some reason cleans up smog a bit.
I think for your car 8-10 is good but for emissions checking go on the conservative side. 7-8 BTDC is great.

For driving you may find that moving it back up to 12 before gives you a bit more torque once you have passed smog.

jasongeek

Thanks guys this looks like it'll be great help. I'm sick right now but when I'm better I'll go and give this a try.

1979blu280zx

you can also try SeaFoming it stuff works amazingly just pull a vac line that sucks (make sure its not the one to your brake booster) shove the hose in the can and rev the car. if the car dies its not a problem pull the hose out of the can start back up and rev higher lol hope this helps

jasongeek

Ok turned the timing down to about 7-8 then went for my free retest and I still failed the hydro carbons aloud is 138 I got 249 at 15 mph and aloud at 25mph is 77 I got 210 any thoughts on why this could be ?

NismoPick

HC means it's either running too rich, or the cat isn't working.

Was the car at running temp for the test? Does the car have a cat? Is the motor stock?

And read this in its entirety: https://www.zdriver.com/forums/showt...ghlight=failed

jasongeek

The engine is stock as far as I'm aware I was driving it around all day so defiantly at operating temp And it does indeed have a cat

Do u think I should try unplugging one of the injectors?

jasongeek

Okay I've unplugged #6 injector lowed the timing to about 5 going on a nice warm up run new oil new plugs fresh gas wish me luck

jasongeek

decided that my smog numbers were two high to go and do the retest so i ordered a new cat it will be here friday will probably put it on over the weekend break it in then smog it on my day off next week

WildmaN

If your # 6 cylinder has good compression. Unplug # 5 with your new cat set your timing to 5 degress, and unplug your cold start valve. Also make sure your oil and filter is fresh, and your car is freshly tuned up. Good luck man. I feel for you.

originalzboy

You can also try getting a new O2 sensor (really simple install). It did wonders for my smog numbers and I picked up a Bosch one at Pep Boys for $35 bucks-ish.