Question about Cars & Trucks

1 Answer

2003 chevy cavalier running rich

My chevy cavalier is running really rich and not giving any code. I have replaced the o2 sensor and map sensor. The exhaust is also smelling like sulfur and spitting out black stuff as well.

Posted by on

  • Brad Cole
    Brad Cole Nov 27, 2013

    Also It won't start with the map sensor plugged in but if I unplug it it will start up but its really rough.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,198 Answers

The catalytic converter probably is failing. If you can pass inspection without it, you can save a lot of money by having it bypassed.

Posted on Nov 28, 2013

Ad

5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
MrScary66613
  • 1990 Answers

SOURCE: 2005 Cobalt Check engine light blinking.

You need to Replace the Catalytic Converter. That is what you are Smelling. It has Clogged up and will also Cause the Light on the Dash Problem. Please Rate My Response! Thanks!

Posted on Feb 01, 2009

chryslertech
  • 115 Answers

SOURCE: Hard start when cold, running rich, poor fuel economy

Chrysler has a bulletin out for a simular condititon that involves replacing the pcm. Heres the bulletin number 18-005-04. This is only 1 possible cause , Fuel pressure, coolant temp sensor, thottle position sensor all can cause like problems. Seeing sensor values and fuel adaptives with a scan tool helps pin point problems.

Posted on Mar 08, 2009

junkman1249
  • 552 Answers

SOURCE: exhaust blows black on ford explorer

look for a vacume leak. black smoke means it is running very rich

Posted on Mar 29, 2009

redbeard00
  • 957 Answers

SOURCE: Cavalier blowing out black smoke car idles fairly well considerin

Black smoke is usually unburned fuel. P0171 reads bank 1 system too lean. There isn't one answer. You need to dig further and inspect your cars fuel system, from the pump to the injectors. Because of the mileage you may want to start off with a compression test just to see where you stand with the motor. write back if you have any other questions.

Posted on May 14, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2.3 liter running very rich will not idle. Have replaced many parts no results. Only o2 sensor & brain remaining original.???


Year make model???? A rich running engine can be caused by
Defective/stuck EGR valve
Defective/sticky fuel injector
Leaky (internal) fuel pressure regulator
Map sensor
Coolant sensor
Mass Airflow sensor
O2 sensor stuck lean (giving false reading)
Bad computer
Have the vehicles operating parameters scanned to monitor sensor operation and values to determine what may be causing this rich condition before throwing your money at unnecessary parts replacement

Sep 05, 2015 | Cars & Trucks

1 Answer

Trac Off light and Cooling Fan running on my 2001 Chevy Cavalier


I had the same problem on my 2001 Sunfire (same car as the Cavalier-different branding) which I was able to fix successfully.

My symptoms were:
-Traction Control OFF light illuminated
-Cooling fan running even if engine cold and it was freezing outside (I also noticed that when the Traction light illuminated, the fan would then begin)
-Rough idle with black smoke when cold
-Poor fuel economy


I have a code reader which produced codes P0130 and P0171. These are error codes for the upstream oxygen sensor (the one under the hood).

I simply replaced the O2 sensor (it took me 10 minutes). I did not reset the check engine light after the repair as I wanted to see what the car would do on its own. The idle was much smoother with no smoke and the cooling fan stopped running unnecessarily. After 1/2 mile down the road, the Trac light went away and the system functioned normally. I tested this by trying to accelerate quickly up a snowy driveway. I also noticed that the acceleration and shifting (auto tranny) were smoother. I reset the check engine light. All is satisfactory.


What was happening to the car before the repair:

P0130 is usually for a bad O2 sensor and P0171 is the sensor detected that the motor was running too lean (but it actually wasn't-the sensor was essentially giving a false lean signal).
The rough idle, black smoke, and poor economy are due to running too rich. In my case, the sensor told the PCM (the car's computer) that the air/fuel mixture was too lean. In response, the computer said "OK, more gas!" That's why it ran rich. This was evidenced on the old O2 sensor as well...it was completely caked with carbon from an excessively rich mixture. This further destroyed the performance of the O2 sensor.

Nov 04, 2013 | 2001 Chevrolet Cavalier

1 Answer

I got a P0601 DTC on my 2001 Chrysler Voyager 2.4. I replaced the PCM and immediately got a P0172 with a rough idle. I replaced the O2 sensors but still have the same problem with same DTCs.


OK. Let's see here...with the code P0601 you had no choice but to replace the PCM. Now here is the kicker...Was it properly programmed before you started the engine up? I just have to ask because I have seen things like this happen with PCM replacements when the PCM did not get programmed properly or when people switch out used PCM's from other vehicles that are not programmed with the correct software for the vehicle it is going into.

Now, with all that said:
P0172-1/1 FUEL SYSTEM RICH
The O2 sensors are RARELY - IF EVER the cause of this code. It does not surprise me that replacing the O2 sensors did not fix it.

Either the O2 sensor signal circuit is shorted to voltage, or you have something wrong with your engine that is causing the engine to run extremely rich. Any way you look at it, your O2 sensor signal voltage is way too high. This is why O2 sensor failures do not usually cause this code. When O2 sensors fail, they do not produce voltage like they should and you will get LEAN codes, not RICH codes.

Anyway, this code is more likely to be caused by a bad engine coolant temperature sensor (ECT), a bad manifold absolute pressure sensor (MAP), a leaking fuel pressure regulator diaphragm, leaking injectors, etc. or something could be shorting out the reference voltage to the MAP sensor and the Throttle Position Sensor.

Please also review this article:

What Else Could Be Wrong?

Sep 20, 2011 | Chrysler Voyager Cars & Trucks

1 Answer

1985 chevy cavalier 4 cyl. diagnostic code 33 and 45 whast do they mean


Code 33 indicates a problem with the MAP sensor
Code 45 indicate exhaust is rich

Apr 19, 2011 | 1985 Chevrolet Cavalier

1 Answer

I have a 98 cavalier keep getting the p0171 code and its running really really rich u can smell the gas in the exhaust ive replace tps sensor feul injectors, feul regulator, coolant temp sensor, both o2...


Usually it's the O2 sensor, but the fuel regulator could be stuck in the high output setting for heavy demand. Or the computer could be acting up. if you can, take it to the dealership, and have them test the computer, and the fuel regulator.

Aug 15, 2010 | 1999 Chevrolet Cavalier

2 Answers

91 chevy 4.3 v-6 runs extremely rich when engine is cold gives codes 13, 33 and 54 I know what these codes are but I need to know is could the computer coolant temp sensor or the air cleaner temp sensor...


DTC - 13 Oxygen sensor circuit open or no activity
DTC - 33 MAP sensor circuit error (signal high indicating low vacuum)
DTC - 54 Fuel pump circuit low voltage

Start with checking the wire leads to the O2 sensors and MAP sensor. Look for any damages to the wire harness and replace any parts damaged or faulty.

The O2 and MAP sensor take reading and sends it to the ECM to recalibrate the fuel injector pulse to adjust the amount of fuel entering the cylinders. When there is an issue to the O2 sensor or MAP sensor and even both, the ECM will be set a a factory default to run rich to keep the engine running and at times the engine may not even run. Normal fuel to air ratio is 14.7:1 - 14.7 air to 1 parts fuel and at default it could be as high as 12.5:1. Good luck and keep me posted, be glad to help you get your truck running 100% again soon and please rate. replacing the thermostat and temperature sensor would also be a good thing since the 4.3 runs best at 190".

Jan 10, 2010 | 1991 Chevrolet S-10

1 Answer

Car wont start, got code p0172, got fuel, spark


PCM detect an excessively rich condition

Oct 19, 2009 | 1998 Chevrolet Cavalier

1 Answer

Cavalier blowing out black smoke car idles fairly well considerin


Black smoke is usually unburned fuel. P0171 reads bank 1 system too lean. There isn't one answer. You need to dig further and inspect your cars fuel system, from the pump to the injectors. Because of the mileage you may want to start off with a compression test just to see where you stand with the motor. write back if you have any other questions.

Apr 24, 2009 | 1999 Dodge Intrepid

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

122 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76846 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...