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Thread: what can i do to fix my hydrocarbons problem

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Posts: 11-20 of 31
2010-08-21 19:21:46
#11
Originally Posted by Cliff
Do NOT decrease timing. INCREASING timing leans the mixture out. This allows for a better fuel burn.

Also, drive the car around for a good 20 minutes, with good amounts of load. I drove my old Del Sol to the emissions station 15 minutes away, and never went into 5th gear at highway speeds. The hotter the cat, the better.


thats odd cause alot of stuff i read said to decrease the timing, an it worked for me! lol
2010-08-21 20:54:14
#12
This is due to a bad catalytic convertor the majority of the time. off brand replacements are cheap. Cat convertors usually last anywhere from 5-20 years. I've had to replace them on more than a few mid 90's cars.

Also a 200 hydrocarbon limit is extremely lenient. I had a car that was pulling ~80 HC/PPM on a CA smog test and it stank pretty bad.. lol.
2010-08-22 17:24:55
#13
i looked at te test andits broken into sections and the sections state that the ecs which is what the cat is tested under has passed. i seem to now have a bit of a wait to start up the engine which will crank for about three four secs and then fire as it warms up it will drop to about 7 then start to bog and an some occasions die. but after i restart it just idles badly.
2010-08-22 17:33:59
#14
check timing, replace vacuum lines, do ignition tune up. Its really simple stuff
2010-08-22 17:43:12
#15
Last year when I did my CT test my hydrocarbons were just under the limit. I asked the guy that ran the test and he said that was stale gas. I hadn't driven the car much and the gas was indeed old. He said next time to come in with a fresh tank of gas.

The AIV hose should be fixed, that can let air into the exhaust which can't help any. I am suprised that it is not leaking exhaust.
2010-08-22 17:57:02
#16
Originally Posted by chrome730
i was tryin to run my car through inspection and my car failed due to high hc

OK.

Mine did too, I replaced the cat and passed.

Originally Posted by Amave
i would start with this 1st.

WHAT CAUSES HIGH HYDROCARBON (HC)?
Below are common failures which are likely to produce high Hydrocarbon HC. Hydrocarbons are basically raw fuel, otherwise known as Gasoline. High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition. However, it's not always that the engine's ignition system is responsible for high Hydrocarbon emissions. Read on.

4. Defective Catalytic Converter - A defective catalytic converter (CAT) may be responsible for high HC, CO, and NOx emissions. The Catalytic Converter, commonly referred to as the CAT is a component designed to continue the combustion process within itself and emit a more thoroughly burned and less harmful emissions containing exhaust. The most accurate way to find out if your vehicle's CAT is working efficiently is by using an exhaust gas analyzer. Unfortunately this tool is fairly expensive. Testing the CAT should be conducted at a smog check repair station.


Originally Posted by chrome730
cause in delawares test it shows what passed and what doesnt as far as emissions and it says the cats ok and everything

So the emission test that you failed, says the "cat is OK."

Has the cat been specifically tested and inspected, removed from the vehicle and examined, by itself, by your mechanic?

See PhorB13's comment below:
Originally Posted by PhorB13
It just says the CAT is ok if you HAVE one. I ran my VE thru in CT and failed, my HCs were high. I replaced the CAT with a universal replacement one, and EVERYTHING, my NOx, my HCs, etc, all dropped considerably and I passed. You can get a cat online for a bit over $100 and call it a day.

Did you actually read that?

Originally Posted by chrome730
it says pass on the cat

You are the hardest headed dude I have ever seen.

You refuse to believe your catalytic converter may be bad.

Originally Posted by neptronix
This is due to a bad catalytic convertor the majority of the time. off brand replacements are cheap. Cat convertors usually last anywhere from 5-20 years. I've had to replace them on more than a few mid 90's cars.


Originally Posted by chrome730
the sections state that the ecs which is what the cat is tested under has passed.

See PhorB13's statement above.

Originally Posted by chrome730
i seem to now have a bit of a wait to start up the engine which will crank for about three four secs and then fire as it warms up it will drop to about 7 then start to bog and an some occasions die. but after i restart it just idles badly.

So your car is running like absolute crap, you refuse to believe it could be your catalytic converter, and you will not even check the thing, even though everyone in this thread has told you to do so?

What the f*ck do you really expect?

Your car admittedly runs like stinky, sweaty, ass crack while you are driving to the Inspection Station. Is it some surprise to you that it does not pass?

Best of luck to you.
2010-08-22 20:06:41
#17
2010-08-22 20:26:58
#18
sometimes its best to listen to the GURU's if your not a well trained mechanic
2010-08-22 22:27:17
#19
must have missed the cat answer
2010-08-22 22:33:36
#20
all of them?
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