Damon

We need some advise. My friend took his car in for the smog test, and way too much hydrocarbons. He has an EG, with a GSR motor, ITR pistons, intake, and exhaust. The ECU is chipped, so we know he failed due to running too rich. My question is: would he be ok taking it back to run on the smog dyno using his stock 92 CX ecu? Would this effect the smog test in a negative way if he is runniing too lean? Would this effect his motor running at 3-4k, causing detonation, and doing harm to the motor?

TIA!

-Damon

GetawayInMoscow

Try retarding the timing next time you go and also go buy that stuff you put in your gas tank that "guarantee's" you to pass emmisions.
Milan

Damon

we will try that...anymore ideas?

JV

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20guy &raquo;</TD></TR><TR><TD CLASS="quote">This is a suggested order for NOx failure of things to check:
1. EGR System
2. O2 Sensor
3. Timing/Spark Advance
4. Catalytic Converter
5. Incorrect/faulty thermostat
6. Coolant Temp Sensor may be open
7. MAP Sensor
8. MAF Sensor
9. Other sensors/switchs (uhhh yeah, ok)
10. Fuel Injection System
11. Faulty On-Board COmputer
12. Computer PROM
13. Internal Engine Repair

High HC Failure:
1. Spark Plugs and Wires
2. Timing Spark Advance
3. Vacuum Leaks
4. Other Ignition Problems
5. O2 Sensor
6 Evaporative fuel system
7. Fuel Injection System
8. Air/Fuel Mixture Adjustment
9. PCV System
10. Catalytic Converter(s)
11. Throttle Position Sensor
12. MAP Sensor
13. MAF Sensor
14. Other Sensors/Switchs (dohh, again)
15. Computer PROM
16. Internal Engine Repair

High CO Failure

In the case of carb engines, up to 85-86
1. Choke System
2. Carburetor Repair

In the case of fuel injected engines, from 1986 on,
1. Fuel Injection System
2. Induction system problems
3. O2 Sensor
4. TPS
5. MAP
6. MAF
7. Coolant Temp Sensor may be closed
8. OTher sensors/switches (I guess this is a CYA thing (cover your ***)
9. Valve train problems
10.Jumped engine timing belt
Plus...
Idle speed adjustment
Air Filter Condition
Thermostatic Air Cleaner
Air Injection/Reaction System
EVAP fuel system
Oil and Filter Change
Catalytic Converter
Computer PROM


That's it in a nutshell... We had a 91 Maxima today that failed for NOx, while the HC and CO readings were great. We began diagnosing what might be the problem. First thing we told him was that cylinder 5 plug was crossthreaded and not seated properly. Also, the injector on that cylinder was bad. Unfortunately he declined the repair and paid the checkout. I really wanted to see if that cylinder being dead was the cause for the high NO, but maybe when he gets it fixed and returns, things will be fine.

As far as your car goes, maybe the O2 sensor needs replacement, even if there is no check engine light.
</TD></TR></TABLE>

Ivan

what were your readings? I also failed due to high hydrocarbons but its cause I'm running a jdm itr ecu and I had a vacuum leak.

rodrez.

ECU will make a big difference, along with a tune up. A stock GSR ECU would be a good idea. I passed using the same set up, with an OEM GSR computer, w/out fear of damaging the motor

JSPECEX

i passed my lsvtec with only a stock si exshuat and a usdm 99-00 si ecu

Ivan

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JSPECEX &raquo;</TD></TR><TR><TD CLASS="quote">i passed my lsvtec with only a stock si exshuat and a usdm 99-00 si ecu</TD></TR></TABLE> did you have the sensor at the oil pump? I can't use any obd2 ecu cause I'm not using that sensor.

Damon

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rodrez &raquo;</TD></TR><TR><TD CLASS="quote">ECU will make a big difference, along with a tune up. A stock GSR ECU would be a good idea. I passed using the same set up, with an OEM GSR computer, w/out fear of damaging the motor </TD></TR></TABLE>i dont think it needs a tune up...it has 2,000 miles since the motor was built.

Robo_Wop

cat convert.

Damon

are you fking serious? we need a cat? dumbass, we know this. it has one.

jdmillusion

i have never taken any car that i've had, to a smog station. my question is, do they use dyno to smog? just an off the topic question.

appreciate it

built562

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Damon &raquo;</TD></TR><TR><TD CLASS="quote">are you fking serious? we need a cat? dumbass, we know this. it has one.</TD></TR></TABLE>

hahaha, yeah that emissions reducer does work, it helped me pass my b16. just put it in and you need to waste almost an entire tank of gas before you retest, also run it with the cx or stock gsr ecu, that plays a huge factor

ps that stuff is berrymans (sp) emissions pass in a white bottle sold at like autozone

921.5CXEG

Our local autozone doesnt stock that... plus the CX ecu just fell on its face as well... the NOx was lower and passed, but the HC and CO were even higher than the chipped ECU