CA SMOG HELP... Im lost '01 3.4l
#1
CA SMOG HELP... Im lost '01 3.4l
I have an 01 3.4l 4x4 Tacoma. It will not pass CA smog for the life of me.
It passed last time barely. This time it will not pass. It is giving high CO and high HCs.
It is not showing any codes. I have tried new plugs and a new o2 sensor, and even new cats. The MAF is clean as well as the throttle body.
It does not give consistent readings on smog. A mechanic tried several things and run several pre-tests and we can't get it to pass.
Anybody have any ideas??
Would the TPS throw a code? What about the fuel pump?
I am thinking it is running rich but I cannot figure out why. Air filter is clean.
It passed last time barely. This time it will not pass. It is giving high CO and high HCs.
It is not showing any codes. I have tried new plugs and a new o2 sensor, and even new cats. The MAF is clean as well as the throttle body.
It does not give consistent readings on smog. A mechanic tried several things and run several pre-tests and we can't get it to pass.
Anybody have any ideas??
Would the TPS throw a code? What about the fuel pump?
I am thinking it is running rich but I cannot figure out why. Air filter is clean.
#2
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Join Date: Feb 2007
Location: Santa Monica, Ca
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Find an address in a city in california that is smog exempt, change ur physical address to that one with dmv, and make ur mailing address whereever u want it to be.... Wallah...no smog problems
#5
Registered User
#6
I have changed the o2 sensor, MAF sensor, and air/fuel ratio sensor.
Now it still runs high on CO.
Could it be a leaky fuel injector? Would this throw a code?
Why is it running rich and no code??????
I would like to get it fixed properly.
Now it still runs high on CO.
Could it be a leaky fuel injector? Would this throw a code?
Why is it running rich and no code??????
I would like to get it fixed properly.
#7
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Location: Columbia River Gorge, Oregon...east side
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From a 5vz-fe FSM:
CO: Normal HC: High Symptom: Rough idle
1. Faulty ignitions:
• Incorrect timing
• Fouled. shorted or improperly gapped plugs
• Open or crossed high-tension cords
2. Incorrect valve clearance
3. w/ EGR:
Leaky EGR valve
4. Leaky intake and exhaust valves
5. Leaky cylinder
CO: Low HC: High Symptom: Rough idle (Fluctuating HC reading)
1. Vacuum leaks:
• PCV hose
• w/ EGR:
EGR valve
• Intake manifold
• Air intake chamber
• Intake air connector
• Throttle body
• lAC valve
• Brake booster line
2. Lean mixture causing misfire
CO: High HC: High Symptom: Rough idle (Black smoke from exhaust)
1. Restricted air filter
2. Plugged PCV valve
3. Faulty SFI systems:
• Faulty fuel pressure regulator
• Clogged fuel return line
• Defective ECT sensor
• Faulty ECM
• Faulty injector
• Faulty throttle position sensor
• Faulty MAF meter
CO: Normal HC: High Symptom: Rough idle
1. Faulty ignitions:
• Incorrect timing
• Fouled. shorted or improperly gapped plugs
• Open or crossed high-tension cords
2. Incorrect valve clearance
3. w/ EGR:
Leaky EGR valve
4. Leaky intake and exhaust valves
5. Leaky cylinder
CO: Low HC: High Symptom: Rough idle (Fluctuating HC reading)
1. Vacuum leaks:
• PCV hose
• w/ EGR:
EGR valve
• Intake manifold
• Air intake chamber
• Intake air connector
• Throttle body
• lAC valve
• Brake booster line
2. Lean mixture causing misfire
CO: High HC: High Symptom: Rough idle (Black smoke from exhaust)
1. Restricted air filter
2. Plugged PCV valve
3. Faulty SFI systems:
• Faulty fuel pressure regulator
• Clogged fuel return line
• Defective ECT sensor
• Faulty ECM
• Faulty injector
• Faulty throttle position sensor
• Faulty MAF meter
Last edited by rworegon; 04-07-2012 at 06:51 AM.
Trending Topics
#8
CO: High HC: High Symptom: Rough idle (Black smoke from exhaust)
1. Restricted air filter
2. Plugged PCV valve
3. Faulty SFI systems:
• Faulty fuel pressure regulator
• Clogged fuel return line
• Defective ECT sensor
• Faulty ECM
• Faulty injector
• Faulty throttle position sensor
• Faulty MAF meter
The fuel trims appear fine, but could it still be the fuel pressure regulator or an injector?
#9
A way to beat the Smog Nazis sounds fishy but works. Use in quart of 93% Alcohol with a quarter tank of 93 octane. The alcohol burns very hot and clean and you will pass. It doesn't hurt the motor and after you pass add more gas to dilute whatever is left.
#10
Want to fix the problem not put a bandaid over it. It should pass.
#12
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