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Idle is too rich. Did not pass smog test - Cars & Trucks

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Best is to do in a garage cause you need a divice to messure.
the CO.

Posted on Oct 18, 2013

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Posted on Jan 02, 2017

kirkx
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SOURCE: I just bought a 93

Could be lots of things.
It could have a leaky injector that is dripping all the time.
You can pull the injectors while still on the fuel lines, to see.
You could have bad compression and burning oil.
You need to do a compression test to tell.
You could have a bad plug or wire.
They are cheap to so just change them.
The fuel injection system could be off.
Check the temp sensor, air mass sensor, O2 sensor, with an ohmmeter.
Don't remember the values, but bad ones usually go 0 or infinite.

Posted on Jun 18, 2011

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1991 Toyota Camry running rich after cleaning the throttle body and replaced the throttle positioning sensor. Checked for vacumm leaks but cant find any


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Toyota Camry running rich Questions & Answers - Fixya

www.fixya.com > Forum > Tags > running rich > Cars & Trucks > Toyota
... running rich I have a 1991 Camry that is running rich. I just replaced the O2 sensor and a new cat, oil change, new spark plugs. The car wont pass smog. it is ...

1992 Toyota Camry XLE V6 Excessive Running Rich ...

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1 Answer

Won't pass smog when it should...


Just because the car seems to run well, does not mean the emissions are within spec. For example, you could be running a little rich and the car will start and run great, but the exhaust is not within code.
What you can do is take it to a "smog shop", that is a repair shop with the proper equipment to diagnose the problem. If the testing is simply the reading of the on board computer codes, then most any place can read those, but you need an experinced mech to know what to do about it. May need an exhaust gas analyzer to physically sample and analyse the gasses. For the actual test, as long as the computer says all is fine, usually, you're good to go.
If the computer looses power any saved run data will be lost and must be re-accumulated to pass the smog test. A few hours to a day is usually enough run time to accumulate enough data.

Dec 04, 2013 | 1999 Saturn SL

1 Answer

2004 PT Cruiser Turbo won't pass smog test because computer monitors haven't completely reset after battery failure. It's been driven 235 miles and only 2 monitors remain unset (oxygen and


The system has to see a wide range of conditions before a smog test can be done. On most brands you have to drive at least 50 miles, at various speeds including stop and go, let it idle for 5 - 10 minutes, and run at freeway speed for at least 25 miles. It also has to reach normal operating temp of 195 degrees.

Apr 22, 2013 | 2004 Chrysler PT Cruiser

1 Answer

Won't pass smog, Rich idle.


First, is the check engine light on ?
You should have a code for the O2 sensor showing the exhaust gas is rich.
Could be a faulty injector, fuel pressure regulator, or O2 sensor.
Even a faulty thermostat would do it.

Sep 15, 2012 | 1991 Oldsmobile Cutlass Cruiser

1 Answer

2000 chevy express idle is surging after it warms up


could be a vac leak or injector problem

Jun 28, 2012 | Cars & Trucks

1 Answer

I just bought a 93 jeep cherokee...it won't pass smog, smog test says its running to rich at idle. How can I get it to pass smog?


Could be lots of things.
It could have a leaky injector that is dripping all the time.
You can pull the injectors while still on the fuel lines, to see.
You could have bad compression and burning oil.
You need to do a compression test to tell.
You could have a bad plug or wire.
They are cheap to so just change them.
The fuel injection system could be off.
Check the temp sensor, air mass sensor, O2 sensor, with an ohmmeter.
Don't remember the values, but bad ones usually go 0 or infinite.

Jun 18, 2011 | Jeep Cherokee Cars & Trucks

2 Answers

97 CAVALIER (Z24) FAILED SMOG TEST


No the water pump will not affect the smog test. You probably failed the idle?
Usually with this age of vehicle you can replace the o2 (oxygen) sensor and it will pass. Cleaning the MAF if it has one cant hurt either if you do it right.

Mar 30, 2010 | 1997 Chevrolet Cavalier

2 Answers

Failed smog, running very rich. changed plugs, cap rotor, wires, tps sensor, map sensor, egr valve cleaned, Has problem keeping stable ide. all over the place. Any ideas


I've seen two cases recently where it was bad distributors causing rough idle. An honorable muffler shop (not a big chain) will test your catalytic converter for free. Is a '91 throttle body? Do Fords have cold start valve or injector? This can cause rich reading if malfunctioning. Anything controlling fuel delivery into engine can malfunction sending extra fuel. When you find problem; do you know clean oil will help pass smog test?

Mar 09, 2010 | 1991 Ford F150

1 Answer

Engine rough idle cold. passes smog once temp reaches thermostat


you can take apart the top section and blow out the small passage that's bellow the throttle plate.

May 01, 2009 | 1987 Toyota Tercel Liftback

1 Answer

1991 Camry running rich


check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.

Jan 30, 2009 | 1991 Toyota Camry

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