Cadillac Owners Forum banner
1 - 5 of 5 Posts

· Registered
Joined
·
7 Posts
Discussion Starter · #1 ·
hello everyone,

i am currently an owner of a 1988 Cadillac Seville STS, and just had to get my car smogged at a test only center.

However I didn't pass the NOX emissions.. failed by over 200 points.

What can I do to fix this?

I just got the radiator changed and felt that I was getting better gas mileage, but maybe at the cost of Higher NO?

Should I put 91 or octane boosters or what can I do to pass this test?

I've read quite a bit to lower NOX, by removing Carbon deposits, too much anti-freeze and so on..

Please any information regarding how to lower NOX is greatly appreciated!
 

· Registered
Joined
·
7 Posts
Discussion Starter · #3 ·
elwesso said:
If your car has EGR, then you will need to make sure its clean....... If the Tstat is bad (running too cold), it could also cause some problems.....

Beyond that I wont say much more because I dont know much more than that, since here in Indiana we dont need to worry about that!!!!

And, welcome aboard!!!
Thanks for welcoming aboard.

Too bad I didn't start out my first thread with a, "Hey how are you!":annoyed:

but I just got depressed that after doing some repairs on the car that only has 119,000 miles it didn't pass smog. I'll have to check and find where the EGR valve is, since I did read about it on the web.:disappoin

I just think that the car sat to long in the garage, and carbon and other no nos got the best of the pistons. I'm going to try a lot of carb/injector/detergents to see if that starts cleaning up the car. :crying:

Amazingly however, the car has been getting some serious improvements in gas mileage since I repaired the belt, radiator, and some minor hoses and electrical wires.. I used to drive 54 miles and lose three gallons, now the digital display didn't budge when I drove. for a moment i had thought that I ruined the fuel gauge, but its working nicely now. Travelled 115 miles and only used up 4 gallons!

I was so confident with the improvement in gas mileage that I thought the car would pass smog. :mad:
 

· Registered
Joined
·
7 Posts
Discussion Starter · #6 ·
Katshot said:
Welcome aboard.
The problem you're having is most likely due to carbon deposits and/or a malfunctioning EGR system. Unfortunately, the catalytic converter could also be the culprit.
I'm not sure why you're trying to draw a connection between your antifreeze and carbon deposits but...........they actually have nothing to do with each other. A can of "Top Engine Cleaner" to remove carbon would probably do wonders.
Thanks again,

The reason why I had linked antifreeze and NOX emissions is because I had read somewhere that too much anti-freeze can create a film around the cylinder walls and contain the heat within the cylinder. Therefore producing the +2300 Degree F environment which causes Nitrogen to breakdown and bond with the oxygen atoms, thereby resulting in Nitrous Oxide (NOX).

I began to consider changing the catalytic converter since the car has been sitting for a very long time and has had some bad days.

The can of "Top engine Cleaner", how does that work, put it in the gas tank and drive around and then refill when tank is empty, or do I have to pull the head for that?

Thanks again!

If it passes smog, I'll be soo happy.

Then I can start on the other things like interior repairs.
 

· Registered
Joined
·
7 Posts
Discussion Starter · #8 ·
elwesso said:
Top engine cleaner is stuff you implement through the intake..... You can get it in aerosol, or in liquid...... Personally, I would recommend using the liquid and pouring it into the brake booster line...... I tried both ways, and the latter works much better......

Just unplug the hose from the brake booster, and put the fluid in there..... You can either use a small funnel (that will fit into the hole, that is what I did), stick the hose into the can (i wouldnt do that), or put a little bit of the stuff into a small container (like a film case or a measuring cup)......
i haven't gotten my helms manual to the cadillac yet, so could you explain to me where the break booster line may be?

It doesn't have anything to do with the actual deceleration mechanism of the vehicle does it? :)

this weekend is NOX reduction weekend. I hope i can get it done!
91 octane, carbon deposit remover, and EGR repair/replacement/cleaning!
 

· Registered
Joined
·
7 Posts
Discussion Starter · #12 ·
elwesso said:
The brake booster simply uses the intake vacuum to make the brake pedal easier to push...... IF you didnt have the brake booster, the pedal would feel real hard, like when you press it a lot with the engine off......

The brake booster is a black, thick frisbe looking thing on the drivers side mounted to the firewall...... There should then be a hose connected to it, that leads to the intake...... When you unplug this hose, you will hear a hissing noise, which is normal......

When you apply the liquid you will put it in that hose, and when your done just plug the hose back in.....
Okay can someone give me a name brand and what it may say? Aree these top engine cleaners meant to into the gas tank but instead we're putting it in through the brake booster?

I went to kragen and I found some bottles for like 3 to 6 bucks that say will clean the valves and carbon deposits from the pistons, but IM confused because they say to put it in through the gas tank?

I need brand name. :)
 
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top