Question about 1994 Jeep Wrangler

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Jeep fails evap. smog test

Wont pass smog fails evap. pressure test emissions are good

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6ya6ya
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Posted on Jan 02, 2017

  • 108 Answers

SOURCE: jeep won't pass smog test

its taking a chance if u dont want to spend the money u may be able to patch with kit or exhast tape i am a ny inspector and i may over look if it were quiet and i would be able to get good reading to exhast probe otherwise my hands are tied. i have a 90 and its a runner worth the investment i know it still has a lot of life left in it

Posted on Apr 03, 2009

  • 58 Answers

SOURCE: 92 Jeep Cherokee losing power up hills / EVAP failure

Running out of power going up a hill is generally the fuel pump. Now days a plugged catalytic converter will do it also. The fuel evaporation test could be a bad gas cap or evaporation canister or hose somewhere. The exhaust manifold is a jeep thing, expansion and contraction, hot cold over and over. Have it welded or replaced.

Posted on Jun 06, 2009

  • 165 Answers

SOURCE: failed emissions

a new pcv is only like 3 bucks try having injectors cleaned out

Posted on Jul 06, 2009

SOURCE: 1993 Grand Jeep Cherokee has fluctuating High emissions

everthing effects the reading. pedal position, rpm load engine temp. air temp. all that stuff you added was just a waste of time and money. What you should of done wa diagnosed it correctly so your not cheating an emission test. Since barley failed the first time I would of recommended a tunup if not done in 40,000 miles. I would have looked at the scanner data to see if the inputs were correct. Iwould have serviced the oil if its been awhile. If everything checked out i would of recommended a catalytic converter. But there are 3 test to determine if the cat is dead we do first. If your car was barley failing and you needed a tunup and the cat was still good the need for a tuneup could toast the cat within a couple weeks.

Posted on Aug 01, 2009

Testimonial: "Assessment was correct. Needed the catalytic converter replaced."

  • 144 Answers

SOURCE: Jeep comes up with EVAP Emission Control System code- please help

YES A CAP FROM THE DEALER WILL MOST LIKELY SOLVE THIS ISSUE...SOME OF THE AFTERMARKET CAPS ARE NOT MADE TO THE PROPER SPECS TO MAINTAIN PROPER PRESSURE/VACUUM ON THE SYSTEM WHEN THE EVAP TEST BY THE COMPUTER OCCURS

Posted on Aug 31, 2009

Testimonial: "Thank you- I'll try that."

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1 Answer

Pass smog test


change your oil and oil filter. Add a bottle of octane boost to the fuel tank then top off with fuel. Drive vehicle for about twenty minutes then have emissions tested. Unless you have a bad catalytic converter, you should pass emissions.

Apr 15, 2014 | 2001 Mitsubishi Eclipse Spyder

1 Answer

Code 442-455 replace all hoses coming from the fuel tank, fuel filter and the and some othr that were craked also replaced the gas cap.


old posts.
wow, no year car stated. not that makes this hard....

wow2, no engine option stated,either. trike 2.
did you forget to use the scan tool an RESET the PCM.?
evap failure !
fuel tank , vent failures.
the FSM covers the tests. in detail.

you use pressure tests. we use shop air, and a low pressure regulator (laws in some states require mech to use nitrogen tanks)
we pressurize the vent system. and make sure it works right.
the tests are easy, here.
i most smog stations we do that at the fuel tank filler neck with a cap
adapter to the pressure leak down tester.

Most smog today are from this system failing, that is why each year
the system is more complex.
EVAP 1 ,2, 3, ETC.

there are 3 classes of failure
  1. wont hold pressure (even a bad cap does that)
  2. the solenoid valves bad. stuck etc.
  3. the tests parts are bad, there are parts of this system just to do the test and they too can fail.
all 3 ways and tests are covered in the FSM.
ever seen one, the factory service manual under EVAP chapters.

the PCM does not ever know why or what is bad, it only knows the EVAP monitors failed, nothing more,
a tech, does the EVAP tests by the book and finds , truth.


ill guess year, 2000
read the emissions page here
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

do you have the leak pump. options?

Feb 26, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Ok the Guy.that ran the emissions test it don't


Check the help link
----



Vehicle smog test failed Due to NO MIL/check engine light?
http://schematicsdiagram.blogspot.com/2011/12/vehicle-smog-test-failed-due-to-no.html

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Dec 22, 2012 | Cars & Trucks

2 Answers

My 2001 vw jetta wont pass smog, failed on emissions part..check engine light is on for multiple things do I need to fix all to get car to pass smog? Fuel injectors and O2 sensor.


ALWAYS PERFORM TESTS AND REPAIRS ON THE FIRST DTC AND RETEST AFTER EACH STEP.ONE SENSOR OR COMPONENT FAILURE CAN CAUSE OTHERS TO FAIL AS A RESULT.MEANING THE FIRST CODE COULD HAVE CAUSED THE OTHER CODES TO CYCLE.SO ALWAYS DIAG THE FIRST CODE STORED AND EACH ONE AFTER AS THEY WERE READ DURING THE SCAN

Oct 09, 2012 | 2002 Volkswagen Jetta TDI

1 Answer

My 1999 kia sephia wont pass smog test


You will need to get it scanned and get the codes for the problem. If it failed the test due to emissions I would almost guarantee it will be your oxygen sensor or cat

Jul 31, 2012 | 1999 Kia Sephia

1 Answer

Failed smog test


Most modern vehicles have 2 catalytic converters, there may be one located at the exhaust manifold, or be what's called a resonator. The resonator will look almost like a cherry bomb muffler, this is a crucial part of exhaust emissions.

Jan 12, 2012 | Chevrolet Blazer Cars & Trucks

1 Answer

Wont pass smog due to malfuntion indicator light on a pt cruiser 2005 everything pass but failed this what can we do to fix it


YOU NEED TO HAVE VECHICLE CODE SCAN FOR FREE AT ANY AUTO PARTS STORE THEY WILL GIVE YOU THE CODE THAT CAUSING CHECK ENGINE LIGHT TO FLASH.ITS MORE LIKELY EVAP LEAK THAT WILL CAUSE YOU TO FAIL SMOG TEST.

Sep 12, 2011 | 2005 Chrysler PT Cruiser

2 Answers

My 2007 Chevy Avalanche failed the emission test with the code of P0455 what is the problem?


It is probably the evap vent valve. A new vent solenoid valve has been redesigned to correct the problem you are having. I would recommend purchasing the dealer component.
I hope this helps.

Jul 02, 2011 | Chevrolet Avalanche Cars & Trucks

1 Answer

Evap Sys Monitor


if evap is the only monitor that hasn't set yet, the car should still pass, a car is allowed to have 1 monitor that isn't set and still pass as long as the check engine light isn't on. take it in for the emissions, it should pass.

Jul 04, 2009 | 1997 Chevrolet Malibu

1 Answer

How do you fix a fuel evap in a 1994 Mazda B2300 truck. It is not passing smog.


sorry, to my knowledge there is no fix...there IS however a fuel additive available that will allow you to pass the Smog test...Google "pass Smog emissions test..."
Good Luck

Jun 15, 2009 | Mazda B2300 Cars & Trucks

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