here's the rundown...

89 CRX w/ B18C1 swap US p72 ecu converted to OBD-1

mods >>>>>>>>>>>>&g t;

DC 4-2-1 header
Akimoto intake
Spoon hi-comp head gasket
new catalytic convertor
used 4 wire O2 sensor
new spark plugs, wires, cap, rotor and distributor
Unorthodox R crank pulley
fuel pressure at 42

Went to the Ref to get my BAR certification. visual passed no problems but smog..
basically my NOx #'s were too high/ meaning my car is running lean. High combustion chamber temperatures. So I think in order to reduce my NOx #'s I'm going to change my O2 sensor, change the fuel filter and adjust my timing. Somehow my timing was at 30 btdc !!! WTF??? I checked the day before and it was at 16?? The ref said my intake cam might be off a tooth?
any suggestions that I didn't already mention???



Modified by APEX CRX at 9:37 AM 9/30/2004


Modified by APEX CRX at 11:21 AM 10/5/2004

 

id say timing only is the problem.

did they measure by jumping the connector?

did you measure by jumpin the connector?

 

come to think of it I did not jump it. I did see the smog ref jump the connector. but would 12 degrees advance be the only thing to get those NO #s that high?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by APEX CRX &raquo;</TD></TR><TR><TD CLASS="quote">...would 12 degrees advance be the only thing to get those NO #s that high?</TD></TR></TABLE>

Probably yes.
It wouldn't hurt to put in a new O@, but if you don't want to spend the cash right now I would try going again with only the timing adjusted correctly.

Looking at the other numbers, your engine and smog look healthy.
Expect your CO's to come up a bit, but since they are so low to begin with there shouldn't be any problem.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF &raquo;</TD></TR><TR><TD CLASS="quote">

Probably yes.
It wouldn't hurt to put in a new O2, but if you don't want to spend the cash right now I would try going again with only the timing adjusted correctly.

</TD></TR></TABLE>
hmmm. okay but what the smog ref said about the cam gear off a tooth?

 

he said that as a "guess" as to why the timing was so advanced.

jump the connect, adjust to the middle red line (16* BTDC), reset the ecu and go for a spin. then go do smog

 

yeah it was a guess, well I'm also running an Unorthodox crank pulley. There is only 2 marks. which are timing and TDC. The left mark on the pulley is supposed to be 16 degrees. I think I'm going to go use a digital gun to make sure. thanks

 

Your NO numbers are way off average but you should be able to get them below MAX... SeaFoam it =]

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Reelizmpro &raquo;</TD></TR><TR><TD CLASS="quote">Your NO numbers are way off average but you should be able to get them below MAX... SeaFoam it =]</TD></TR></TABLE>

That's retarded.
His timing is way off which makes the combustion chamber temps go high = production of NO.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by APEX CRX &raquo;</TD></TR><TR><TD CLASS="quote">
hmmm. okay but what the smog ref said about the cam gear off a tooth?</TD></TR></TABLE>

Wouldn't hurt to check it. I don't think it's all that hard to check either.
I'm not a B-series owner, but you should be able to just manually rotate the crank to the TDC mark lines up in the sights correctly and then take the upper timing belt cover off and check the cam gears for correct positioning.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by APEX CRX &raquo;</TD></TR><TR><TD CLASS="quote">I think I'm going to go use a digital gun to make sure. thanks</TD></TR></TABLE>

Whichever gun you use this time don't forget to put a jumper in the service connector!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Reelizmpro &raquo;</TD></TR><TR><TD CLASS="quote">Your NO numbers are way off average but you should be able to get them below MAX... SeaFoam it =]</TD></TR></TABLE>

Its a new engine, seafoam wont help

Good luck Vee, I would make sure that timing is perfect, and hit up the smog again. Your timing was so far off, im sure it will lower the numbers A LOT.
Ryan

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Reelizmpro &raquo;</TD></TR><TR><TD CLASS="quote">Your NO numbers are way off average but you should be able to get them below MAX... SeaFoam it =]</TD></TR></TABLE>

I don't agree with the seafoam either. I've heard mixed results with it. also this is a new shortblock and head. Only used part on this car is the Intake manifold and injectors. I'll pull the valve cover and check my cam timing and my ignition timing with a jumper in the serice port this time!! (doh). My hi-comp gasket also is playing a small part due to the .3 bump in compression its giving me.

 

anybody know if an O2 sensor can be cleaned??

 

Your NOx is high because your timing is advanced. With 30 degrees of base timing, you are going to have detonation from hell. This will most definitely cause high NOx. First, check your cam timing as the ref suggested. With 30 degrees of advance, it is likely that the cam could be off by a tooth. Correct if necessary and readjust the distributer with a timing gun.

 

thanks, I'll do the suggested. correct my timing and do a free re-test at a buddy's shop before I return to the ref. Also since my timing was this off wondering why my Knock Sensor never pulled back my timing while pinging?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by APEX CRX &raquo;</TD></TR><TR><TD CLASS="quote">Also since my timing was this off wondering why my Knock Sensor never pulled back my timing while pinging?</TD></TR></TABLE>