Hello fellow Brickboard members!

I am writing to you in hopes that you can assist me on my failed smog problem. I have a 1991 Volvo 240 Wagon that recently failed smog quite badly, actually it earned the GROSS POLLUTER award. YEAH!

Well a little about my car, I recently replaced.....everything no not really but I have replace the following with new OEM parts: Idle control valve, Air Mass Meter, O2 sensor, spark plugs, spark plug cables, timing belt, and air filter

I have also replace the whole exhaust system from the Y-pipe back including the Catalytic converter

Since it failed smog before I decided to give her the old Water Torture trick. I put about a can of Seafoam in the intake and another in the gas tank running 91 octane gas. In hopes that this would clean out all the carbon deposits. Well she smoked...a lot and she ran way better. The idle went from about 1200 to 700 and she idles and runs really smooth and quite. I decide to run through that tank of gas with the Seafoam in it then got an oil and oil filter change and tried to smog her again.

Here are the results:

15MPH TEST

RPM-1669
CO2%-13.2
O2%-1.4
HC- MAX:116 MEAS:181
CO%- MAX:0.74 MEAS:0.75
NO(PPM)- MAX:791 MEAS:2540


25MPH TEST

RPM-2636
CO2%-14.8
O2%-0.0
HC- MAX:91 MEAS:55
CO%- MAX:0.62 MEAS:0.59
NO(PPM)- MAX:730 MEAS:825


So there are the results. I am hoping you guys can help me decipher what she might be doing wrong. I know the high NO is usually caused by high combustion chamber temperature, possible indicating a lean condition. I have been checking for vacuum leaks with no luck. I was also thinking could it be due to off timing? I replace the belt and ensured that all the timing marks were aligned but could the camshaft and intermediate shaft be aligned with the indicators but be off in timing if that makes sense. For better indication the timing marks are all aligned but the camshaft sprocket does not have cylinder 1 at TDC. My question I guess would be if all the marks line up are all the cylinders and distributors correctly lined up?

I would appreciate any help you guys would be able to give me, as I only have 3 more days until I need her to pass smog. Thanks! have a great day!

Garrett