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1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

 
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Old 03-09-2016, 01:03 AM
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1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

1989 fails smog HC and NO.

Done some reading and from what I understand Failing HC or too much hydro carbon is from a bad catalytic converter. It is not burning off the unused fumes. The too high Co , which it passed, is from bad oxygen sensors. Too high NO is from the egr valve not working or intake manifold being clogged.

with that being said if there is blue smoke does that mean the piston rings are fried?

how much ballpark do u guys imagine it would cost too get it past smog fixing the co and no problem?
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Old 03-09-2016, 11:06 AM
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Re: 1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

Sorry, can't help you at all with your emissions questions. We don't have to suffer through that where I live so I haven't had to deal with trying to get an old car to pass.

I certainly don't consider myself an expert, but I can maybe help you with your blue smoke issue. As most everyone knows, blue smoke is indicative of oil burning. Just because there is oil smoke, doesn't mean that the rings are the cause. Oil burning can also be caused by worn valve seals. It can also be caused by a bad PCV valve. A general rule of thumb I go by is to first replace the PCV valve. No need to even try to test it because it probably needs to be replaced, and they're only about 5 bucks. And most of the "methods" of testing them are not even correct. If it's still burning oil (which it probably will be), pay attention to when it smokes the worst. Generally speaking, if it's worse on acceleration it's probably rings. If it's worse on deceleration it's probably valve seals. Of course you could have an issue with both. In which case it would be difficult to tell. Another way to tell if it's rings would be to do a dry compression test followed by a wet compression test. If the compression numbers go up significantly for the wet test you have bad rings. A leak-down test can also give you an idea of the condition of your rings.

How many miles are on the engine? How much oil do you have to add between oil changes? How heavy is the smoke? Is it really obvious, or do you have to have just the right lighting to see it?
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Old 03-09-2016, 10:32 PM
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Re: 1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

220,000 miles
I don't know for sure whether or not there is blue smoke. But from my reading I wanted to know more about the possibilities of what might cause blue smoke if it is there. This is a car up in the bay area that I'm about to purchase and trying to get prepared to fix it up. So I cannot inspect the car in person

The car runs drives great, but according to the seller it has not passed smog.
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Old 03-10-2016, 12:41 AM
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Re: 1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

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with that being said if there is blue smoke does that mean the piston rings are fried?
Haha...well you're the one who mentioned the blue smoke.
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Old 03-11-2016, 09:45 AM
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Re: 1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

Every once in a while my 90 auto lude starts up with a little blue smoke but passes emmisions. Hope you don't have any codes. The hc or hydrocarbons is unburnt fuel. Your cats are supposed to burn that off. Your O2 is from your oxygen sensors. Your NOx is from too high cylinder temps where the egr valve is supposed to open . Can you tell me what you're failing? I failed NOx 4 years in a row. I'll give you some tricks. Sometimes worn out valve guides causes blue smoke. Yes it's a b21. My 91 b20 burns no oil.If you got the b21 you might have to live with it. Also my b21 has 272,000 miles.

Last edited by Lespaul59; 03-11-2016 at 10:19 AM.
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Old 03-11-2016, 11:12 AM
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Re: 1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

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Originally Posted by Lespaul59 View Post
If you got the b21 you might have to live with it. Also my b21 has 272,000 miles.
First thing he mentioned is that it's an 89, so it's a b20 unless it's been swapped out.

That's pretty high for a b21. How much oil does it go through between oil changes?
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Old 03-11-2016, 09:54 PM
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Re: 1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

I think I use a quart every 300 miles.
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Old 03-11-2016, 11:06 PM
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Re: 1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

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Originally Posted by Lespaul59 View Post
I think I use a quart every 300 miles.
I hope you meant to say every 3000 miles.
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Old 03-12-2016, 02:57 AM
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Re: 1989 fails smog HC and NO, if there is blue smoke are the piston rings fried?

Even my b20a isn't that good.With 272,000 miles and being a b21 it's eating up a lot of oil.
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