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Old 05-03-2004, 09:39 AM   #1
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source of high HC at idle for smog check?

So one the way home from failing my smog check, I hit 200K on my toyota
van.
It a 2.0 L 3yec auto.
Everything passed except HC at idle (1050rpm). Been looking through my FSM
and seems that it might be PVC, EVAP or catalitic converter. My ecu is
clear of any codes, gas cap seal is ok and oil filler cap is tight. I plan
on testing PVC and EVAP soon but wanted any advice I can get before I get
into this.
TIA
Nathan
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Old 05-03-2004, 10:08 AM   #2
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Ran into the same problem with my girlfriends 87 corolla, Here is the thread, did what the guys told exept for a new cat, will be going in to get it smogged again in an hour, will update if it passed or not.

Good luck!
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Old 05-03-2004, 11:25 AM   #3
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I'm only about 40ppm over max on idle HC. Went in with recent oil change and air filter. It's efi so no carb to clean. I think I'll try more complete TB cleaning and a new PVC. I'm also going to check for vac leaks. I'm 25 mile from the nearest inpection shop so it was completely warmed-up. They were done with preinspection within 1/2 hour so I'm sure it didn't cool off too quickly
thanks for the quick reply.
Nathan
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Old 03-12-2011, 02:57 PM   #4
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90 corolla fail smog high hc

1990 corolla just failed smog:
15mph 1963 rpm 98 max 43 ave 146 measured
25mph 1920 rpm 73 max 32 ave 93 measured
pcv passed
cat passed
egr passed visual
egr functional was n/a...hmmm
Any ideas on what to do?
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Old 03-12-2011, 05:29 PM   #5
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Hydrocarbons is unburnt or raw fuel. Possible causes are dirty injectors, PCV valve, EVAP solenoid, fuel pressure regulator, bad VAFM, dirty air filter or restriction in airway, low cylinder compression, worn spark plugs, weak ignition coil, coolant temperature sensor out of range, intake air temperature sensor out of range or bad oxygen sensor. That is all I can think of. Since you have 200k on it I would lean (pun inteneded) towards dirty injectors, bad O2, EVAP system and VAFM out of wack.

James
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Old 03-13-2011, 10:09 AM   #6
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Question thx

Hey James thanks for the info. I was just looking in my manual. It suggested changing the charcoal canister. What u think?
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Old 03-13-2011, 01:01 PM   #7
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Originally Posted by r8ercurt View Post
Hey James thanks for the info. I was just looking in my manual. It suggested changing the charcoal canister. What u think?
Pinch off the hoses and see what readings the HC's are. I still think it is fuel injectors or a oxygen sensor since these parts are the heart of the fuel system and they do wear and get dirty.

James
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Old 03-15-2011, 01:32 PM   #8
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Thx

Yeah ni changed O2 sensor changer air filter cleaned spark plugs everything else has been replaced except catalytic converter. I will try again this Saturday Wish me luck. Again Thank You
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Old 03-15-2011, 01:32 PM
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