I smogged mine a day or two after doing the combustion chamber treatment..If your running 1/2 the can through the fuel system as recommended on the can, I would run it all the way to almost empty then refill with premium before the next test.


I changed my oil right before passing the test as well, not sure if that helped or not. But it may help, as old oil may have some impurities in it from the seafoam/fuel which could possibly cause an increase in emmissions if it burns off if it makes it way past the rings on the cyl walls...

Also. Did you conform your timing as good to go?

I changed the oil and oil filter one day before the first test.

Did you test the EGR valve? If you apply vacuum to the EGR valve at idle, it should stall the engine if it is working.

If you read your emissions results, (Post them if possible!)if there is any CO reading with high NOX present most likely need a new cat. It might still have a warranty, check your receipt.

A guy I know fails every time with his car, then puts in a new cat and passes. He goes to some local joint that fits in a universal for $90.

I just failed with my 92, but with lower levels than you are posting. I read Justice's and other threads. No EGR on my 95 with CA emissions...??? <img src="/forums/images/graemlins/confused.gif" alt="" />

I gave it SeaFoam in all three inputs. Then when the tank was low, changed the oil, put in 1/4 tank 95 octane, and then some booster as well. Also had some cat leaks at the seams that I patched up. Just past on the second try.

I forgot the emissions stuff to post. I'll post tonight, and am planning on buying some Seafoam on my way home as well. I'm planning on a retest this weekend or early next week. I would hate to replace the cat.

Okay, here are the results from all of the emission tests to date:

10-5-07 Vehicle Purchased:
Test RPM CO2 O2 HCmax HCmeas COmax COmeas
Idle 733 11.9 4.7 120 289 1.00 0.18
2500 2598 15.2 0.0 180 1318 1.00 0.40
Result - GROSS POLLUTER/GROSS POLLUTER
Followed this test with a valve adjustment

10-15-07 Follow-Up Test
Test RPM CO2 O2 HCmx HCmea COmx COmea NOmx NOmea
15mph 1803 14.9 0.06 118 65 0.68 0.04 999 1704
25mph 1930 14.58 0.00 98 327 0.87 0.69 859 905
Result - FAIL/GROSS POLLUTER
Followed this test with:
R&R Cylinder Head
Complete Valve Job
Mill Exhaust Valves
New Camshaft

10-22-07 Follow-Up Test
Test RPM CO2 O2 HCmx HCmea COmx COmea NOmx NOmea
15mph 1894 14.9 0.07 118 28 0.68 0.19 999 1029
25mph 1935 14.9 0.07 98 27 0.87 0.16 859 1043
Result - FAIL/FAIL
Followed this test with new high flow catalytic converter



11-23-07 Follow-Up Test
Test RPM CO2 O2 HCmx HCmea COmx COmea NOmx NOmea
15mph 1893 15.1 0.07 118 15 0.68 0.01 999 389
25mph 1919 15.1 0.03 98 12 0.87 0.01 859 196
Result - PASS/PASS

It has been two years and needed a new test to keep a current registration. I had the oil changed one day prior to this test.

07-25-09 Test
Test RPM CO2 O2 HCmx HCmea COmx COmea NOmx NOmea
15mph 1986 15.1 0.1 118 52 0.68 0.1 999 1644
25mph 1959 15.0 0.1 98 42 0.87 0.07 859 744
Result - FAIL/PASS
Following this test I replaced:
EGR Intake pipe gaskets
EGR Gasket
Cleaned the EGR Valve
Cleaned the EGR Intake Tube
Ran a can of fuel system cleaner

08-22-09 Follow-Up Test
Test RPM CO2 O2 HCmx HCmea COmx COmea NOmx NOmea
15mph 1969 13.9 1.6 118 62 0.68 0.00 999 3102
25mph 1939 14.5 0.8 98 42 0.87 0.00 859 2455
Result - GROSS POLLUTER/GROSS POLLUTER
The gas tank still had some of the fuel system cleaner in it when this test was run.

Things done since -
Ran a can of SeaFoam in the fuel tank and crankcase.

To do -
Test check the vacuum lines and EGR.
Test check the EGR Temp Sensor.
Test check the Oxygen Sensor.

Note: I have service records going back to day one and the O2 sensor has never been replaced

As a last option I will replace the Cat.

Thoughts? <img src="/forums/images/graemlins/confused.gif" alt="" />

Sounds like a solid plan. If you still have original 02 Sensor I would consider replacing it. I think I used oxygensensors.com fast service and a decent price for a denso unit with oem type connector. Also did you clean the EGR port in the intake that runs in the plenumn from the Pipe to the valve? Mine was full of carbon. In my opininon if you get it running right you should be able to get it to pass without replacing the cat..

That was the only part I did not clean. I need to get a wire brush and go at it. I'll keep everyone posted.

I parked mine on an incline and shot berrymans carb cleaner into the front port untill it ran out clear...I got a lot of carbon out of it that way.

I'll give that a try. We have plenty on inclines here in SF. The steepest paved road in the western US is outside my front door.