source of high HC at idle for smog check?
05-03-2004, 09:39 AM
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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
, I hit 200K on my toyotavan.
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
05-03-2004, 10:08 AM
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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!
Good luck!
05-03-2004, 11:25 AM
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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
thanks for the quick reply.
Nathan
03-12-2011, 02:57 PM
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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?
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?
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
) towards dirty injectors, bad O2, EVAP system and VAFM out of wack.James
thx
03-13-2011, 01:01 PM
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James
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03-15-2011, 01:32 PM
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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
converter. I will try again this Saturday Wish me luck. Again Thank You
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