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Engine tests as running rich

Good plugs and wires

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What cause the engine to run rich and black smoke coming from tail pipe?


hmmm sounds like the fuel pump is more of the issue as its sending too much fuel into the motor making it run rich or the gas that your using is too rich for the motor itself

Apr 22, 2017 | Cars & Trucks

2 Answers

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


92 camry failed smog because running rich. Why? - Toyota Nation ...

www.toyotanation.com/.../411132-92-camry-failed-smog-because-runni...

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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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1992 Toyota Camry XLE V6 Excessive Running Rich ... 1997Toyota Camry V6 forward Oxygen (O2) Sensors .

Jan 11, 2016 | Toyota Cars & Trucks

2 Answers

Have a 89 jeep with a 2.5 liter, keeps fouling out the plugs.


How is your o2 sensor? if it is bad it would make the car run rich and foul the plugs.

Aug 09, 2015 | Jeep Cars & Trucks

1 Answer

When started cold and engines warming up the gas smoke and smell gas fumes


which engine, and year?
the engine is running way rich,
black smoke is very very rich .
its sick. get it serviced now.
lots of cause. do you want to do test or ask the blind for guessing.
????
The EFI engine can go rich for many reasons.
there are tests for each.
  1. check fuses
  2. scan the PCM first. got errors, they are REAL report them or read the FSM on what to do for each , its there. read it.
  3. fuel pressure way too high.
  4. ECT sensor wires fell off (scan it , and it tells you just that)
  5. leaking injectors (do a balance test)
  6. never tuned up this decade, so,, spark plugs ? replace them?
  7. Map sensor not working (vacuum to it missing, wires fell off)
  8. scan it driving , got more DTC errors. report them.
  9. FPR (fuel reg) bad. or vacuum to it missing. see #3

Apr 22, 2015 | Jeep Liberty Cars & Trucks

1 Answer

Running rich


Hi Justin
you seems that you have a good idea about engines and injection systems, lets say that the computer see's rich exhaust and pulls back fuel mixture. creating misfire. why the engine is misfiring on one cylinder only??
my advice to you
1 search for a vacuum leak corresponding to the misfiring cylinder, like a manifold gasket or injector seal.
2, do a compression test for all cylinders, probably you have a burnet valve.
Good luck and let me know how it goes.

Mar 03, 2014 | Kia Sedona Cars & Trucks

1 Answer

I own a 2004 avalanche with a 5.3 vortex. I was driving on the highway @ 110km/p/hr, I then accelorated to about 125 and my engine check light came on. I took it to a garage and they scanned the engine.The...


Spark plugs don't fail to fire. They are replaced at 60,000 miles or 3 years.
Scanning for codes and using an ignition scope, are two different things
I have run OEM plug wires 17,18 and currently 21 years, on different vehicles.
Replace,only if they fail and test bad. Only one wire EVER fails,not all of them
The O2 Sensor may have set a code.
You don't change it,because of that.
You look at the data, and if it is working correctly,and what caused it to go
out of range and set the check light.

Did he check for a failed injector,on the bank that was rich?
Was exhaust gas tested, to determine the rich condition?
There is no guessing or might be's

Do a cylinder leak down test
Don't like the results,pull the valve cover, and check out the valve spring theory

What was the codes that you got when driving it?
How many miles on it?
Vehicle history?

Nov 25, 2010 | Chevrolet Avalanche Cars & Trucks

2 Answers

L failed # i on the emisions test which is the HC l put new spark plugs in and had the throddle body cleaned and oil changed the reading is supposed to be 57 i had 128 took it in after spark plugs and...


Your engine is still running rich, inspect all your vacuum lines and your fuel pressure regulator. A bad fuel pressure regulator can cause your engine to run rich and is there any check engine light on???
Thank you for suing Fixya and keep me posted, be glad to help you get your car running 100% again soon

Mar 29, 2010 | 1991 Chevrolet Camaro

1 Answer

93 jeep grand cherokee. Starts and idles ok.


Being injected, the control system varies fuel quantity and does not directly regulate air flow. Therefore, having black soot on plugs tells you that there is too much fuel going into the engine. The O2 sensor tends to react to, more than control that. Missing can be the result of plug fouling. Backfire may be the result of a too rich fuel mix permitting unburned fuel to enter the hot exhaust where it re-ignites.
Where I would look first in your case is to the manifold air temp sending unit and the coolant temp sender as well. If either or both are out of range the computer may "think" it is running a cold engine and therefore adding additional fuel for cold start up,and not switching to normal run mode when the engine reaches operating temp. Once the plugs foul the engine will continue to run poorly regardless of other conditions. You can test each component individually using either chilton or haynes manual as a guide. You will need a decent digital multi-meter to do the tests.
You can also have a code test done at most major parts stores, but often if sensors are not bad enough to set a code but together are causing a problem, you may not see anything except the O2 sensor.
There are other possible causes such as worn out injectors, but most often that won't happen in all cylinders at the same time. Do testing first, correct whatever you find and then make sure plugs are clean. If after running, the O2 sensor continues to register a fault, then replace it.
Good luck...any further questions are welcome and don't forget to rate answers!!!

Feb 22, 2010 | 1993 Jeep Grand Cherokee

1 Answer

Check engine light


have you checked the MAP sensor? located rear engine area, center upper firewall, see if vacuum line is attached or leaking, I believe your local autozone can test it to determine whether or not it is good, running rich is a good sign that you have a problem with it or vacuum supplied to it, let me know

May 25, 2009 | 1995 Ford F150 Styleside Regular Cab

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