Question about 2005 Chevrolet Silverado

1 Answer

2005 silverado..5.3...motor idle rough.. getting 3 codes

Ok.. here we go.. engine is idleing rough blows black smoke when motor is revved up..poor gas mileage.. and get 3 codes coming up..and they r PO171 PO174 and PO300.. i changed the o2 sensor on bank1 didnt help..any suggestions??..

Posted by on

  • terickster21 Aug 11, 2009

    changed both o2 sensors on right and left side...runs fine now..

×

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 2 Answers

P0171 and o0174 is lean replace intake gasket they will be a teal color,the old ones are red. i work for chevrolet.this is a common problem

Posted on Feb 12, 2009

Ad

1 Suggested Answer

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 Mechanic 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 repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

2006 jeep Cherokee 5.4 hemi smokes real bad and idles rough but not when revving the engine


Have you had the engine control unit scanned for fault codes? Is this oil smoke or fuel?

Oct 20, 2016 | Jeep Cherokee 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

86 gmc high sierra k1500


If the check engine light is on, you would need to check the computer for trouble codes first.
If the engine is fuel injected, it could be a bad injector. If it has a carb, it could be a sticking choke or an internal leak.

Apr 30, 2013 | GMC Sierra Cars & Trucks

1 Answer

Why is it that over revving results in more black smokes? Is it a good standard for smoke test to over rev? I own a 1 year and 5 months Mitsubishi Montero Sport with 13,000 kilometer mileage. Also, a Mazda...


The Effects of Over Revving a motor can be Catastrophic. I do not understand why the government would require someone to do such a test. Normal Emissions Testing is done at High (2100 - 2500) and the Idle (500-900).

Reason for Increased Smoke.... As you increase the internal pressure of the vehicle, you are creating a VACUUM and this is suckking the Oil past the rings, and anywhere else that it is causing the Vacuum.

Efffects of Over Revving van be Premature Failure of the engine (Could cost you $5-$8,000 to replace)... I would ask WHY so high... A Diesel would MAX OUT their RPM @ 4,000.

These people who are doing the test, ask them to show you where it says in WRITING 4,000... That is much higher than in the 4 states I have been certified to be an I/M Inspector

Apr 05, 2013 | 1998 Mitsubishi Montero Sport

1 Answer

I have a 1998 dodge ram 4x4 with a 5.9, engine has been idleing rough, it idles fine for about 30 seconds then runs rough, almost to stalling, also the gas mileage is like 3 miles to the gallon. i had it...


If the speed sensor code is coming up change it. the sensor went out on my truck and it would die when i was slowing down and hit the clutch to downshift

Jan 26, 2013 | 1998 Dodge Ram 1500 4WD

1 Answer

Poor fuel economy


If there is a vac leak or a split in the hose between the intake and the MAF you can get a code for the sensor. The code is saying the data from the sensor is not what it should be, not necessarily that the sensor has failed.
Clogged air filter or box could cause a problem too.

Jul 05, 2012 | 2005 Chevrolet Silverado

2 Answers

Black smoke>fuel consumption>rough idle


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Mar 04, 2012 | Cars & Trucks

2 Answers

We just purchased a 2002 Ford Escort. Tonight, when starting the car, it ran very rough and then died. We started it again and it ran fine after that. It has happened twice and it has only happened when...


Could be a idle air problem. The injector could be leaking when you shut it off ..Try some injector cleaner see if it gets better..The idle air shouldnt run rough just idle real low or sometimes it will get stuck and idle high....Are you losing any antifreeze..If you are the 2.0 SOHC engine bad about leaking antifreeze into the cylinder and makes the engine run rough until it burns it out..See if you can see the smoke coming out when it happens..White smoke indicates antifreeze,,Black smoke indicates fuel..

Sep 04, 2011 | 2002 Ford Escort

2 Answers

Want to know what a code PO171 means(system too lean bank1).car idles rough and blows black smoke when you rev it up.and is also misfiring.?


If the car is thinking its lean, but its blowing black smoke then it sounds like its confused. Sounds like the o2 sensor is bad. How does it run when its cold?

Feb 12, 2011 | Pontiac Sunfire Cars & Trucks

Not finding what you are looking for?
2005 Chevrolet Silverado Logo

1,133 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

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

Answer questions

Manuals & User Guides

Loading...