Timing problems

[Macamon]

My recently purchased 240 failed smog:mad: , so:I changed rotor, cap, and plugs,(wires were already new):pface . Went to shoot the timing and the marks are nowhere near the pointer . Am I doing something wrong???

I put the rotor in the same position as the old one, I would also like to know how to check that the rotor is in the correct position

[s13sr20chris]

the rotor only goes on one way. it should bolt in there too. did you unplug the tps? you will need to do that to set the timing. how does your car run? if it runs bad you may have a prob with your valve timing or dist timing. what emissions did it fail for?

[NISTECH]

also before you start it to check the timing. locate the marks on the pulley and clean them off to make them more visable. If the colors are still very faint you may want to mark the appropriate mark with a grease pencil for easier refference when shooting it with the light.

If the car runs ok and the marks are still out of site you may have had the harmonic balancer spun inside the pulley,not all that uncommon.

[Macamon]

the rotor only goes on one way. it should bolt in there too.

It appears to be hex shaped and there is no idiot slot to keep you from putting it on wrong.

did you unplug the tps? you will need to do that to set the timing. how does your car run?

TPS I still have to purchase the manual for this car and am having a difficult time finding one I tuned it by ear (I guess with the TPS plugged in) and got it where it is no longer pushing so many hydrocarbons but Co has gone up. (but she got power back :pface

if it runs bad you may have a prob with your valve timing or dist timing. what emissions did it fail for?

Emissions failed for hydrocarbons

[s13sr20chris]

just hydrocarbons? your rich bro. most likely components:maf, ect, o2, etc.

the o2 is not as powerfull in this respect as many people think. a good fresh cat and a little denatured alcohol in your tank may just take care of it for you. dont drive hard on alcohol though.

[s13sr20chris]

oh by the way, retarded timing should not affect your emmisions. advanced timing should only affect your nox. i dont live in a smog state so this is all just textbook stuff. NISTECH is that all correct?

[NISTECH]

actually a failure by just hydrocarbons usually indicates an ignition misfire. If he had failed for CO as well then I would say rich. You really need to look at all 3 numbers to determine what the failure is.

Did you have a dyno emissions test or a 2 speed idle test. If possible post your numbers as that would be the easiest way for us to help you,it gives us the whole picture.

But if you other 2 readings were about normal and just hydrocarbons were high start looking for a secondary ignition component as the source.

[Macamon]

Smog report was as follows: TEST TYPE: 2 stage Dyno test 15 MPH: 1775 RPM MEASURED AVERAGECO2/O2 14.3/.03 N/AHC MAX:118 221 31CO MAX: .75% .43% .10NO MAX: 799 660 237

25 MPH: MEASURED AVERAGE CO2/O2 14.3/.03 N/AHC MAX: 93 200 20CO MAX: .63% .42% .09NO MAX: 738 540 199

I certainly appreciate you guys helping me on this, I'd like to qualify that my statment of CO going up when I changed timing is based on my nose and getting a headache from sniffing the exhaust :ylsuper (only briefly) I have a very sensitive nose and am usually able to tell by smelling exhaust if a car will pass or be close to passing :icesangel

[NISTECH]

Looking at your readings I think your have a couple things going on. obviously the cat is getting weak. but you are also missfireing your NOx being slightly elevated in conjunction with the HC indicates that. but your CO is slightly elevated as well I think if you put a cat on it you very well could pass smog with that alone. But be aware it also appears you have a slight miss going on as well.

[s13sr20chris]

dang hes good!

[Macamon]

Nistech: So I should be able to get things back into place with a replacement wire set (already changed plugs, cap, and rotor. Bosch/Nissan genuine) and a cat?

[NISTECH]

yea Throw the wires on set your timing per the FSM and get the cat replaced then have it retested. Be fore you do any of it make absolutly sure you dont have a vaccum leak cause that will cause a lean missfire and cause almost exactly the same failure. except your CO might be a little lower.

[180fan]

dang hes good!

true that man. Nistech's the man especially when it comes to emissions.

[Macamon]

Nistech:Actually I guess it got lost in the discussion. When I shot the timing, there are 4 marks, and at present setting are considerably advanced of the timing indicator. I have no manual so have no idea what mark is for what, I'm still looking for a manual, stores are either not carrying them or they are out. s13sr20chris said something about unplugging the TPS while shooting timing. 1. Could you explain what the 4 timing marks indicate.2. What the heck is a TPS? and how do I pull the plug on it?

[DAEDALUS]

El Segundo--Woot woot! Actually I moved to Hawthorne a year ago, but I will move back as soon as I can afford it. Used to live on Sheldon, just south of Grand. Good to have another southbay NICOer!

[NISTECH]

here is the procedure for a 93 but it should be the same.

[Macamon]

I LOVE YOU :')

[Macamon]

O.K. New problem:There does seem to be a difference between 92/93 models.

I have 4 marks instead of 6. Also I assumed that the timing was to be set at 15 deg. and then found my hood had been replaced :/Nistech, could you check for '92 and verify that timing is set to 20 deg and how to read the harmonic balancer with only 4 notches

Thanks

[NISTECH]

is one of the marks colored either yellow or orange? I dont have a 92 manual on my computer.

[s13EastTN]

91-94 should all be the same, I know my 91 has 6 marks. Timing is set to 20' BTDC btw.

Look a little harder because you should definatelly have six marks, not four.