Question about 2005 Chevrolet Silverado

1 Answer

My 2005 silverado is running rough especially at low rpm or idle. I have changed the MAF sensor, plugs and wires, throttle body and had catalytic converters cut off because they were stopped up. It is running really rich like its not firing on all cylinders. Can you give me some tips to point me in the right direction?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 3,950 Answers

Vacuum leak, tear in the air duct between the MAF and throttle body. Have it scanned to see what the fuel trims show. A vacuum leak will cause the PCM to add more fuel to correct a lean condition. That'll cause misfires and load the converter, causing it to melt down and restrict exhaust. Sound like you're throwing parts at it instead of diagnosing the problem

Posted on Dec 05, 2017

Ad

6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Anonymous

  • 106 Answers

SOURCE: 1990 Lumina running roung, power loss rough idle

On the chevy v6 engines it real comon to have intake leaks.I would try spraing carb cleaner around the intake while the car is running and see if it changes the way it runs.If it does that is your problem.If the intake has a leak it will **** extra air in and cause a missfire.

Posted on Mar 03, 2009

Eric

  • 18 Answers

SOURCE: Hi I have a 1992 silverado with a 350,hard to start.

When it runs really rough is there alot of black smoke? Could be the fuel pressure regulator diaphram, real easy to change on that TBI...

Posted on Apr 01, 2009

Anonymous

  • 4 Answers

SOURCE: 89 Corsica: no power, hesitates in drive, idles

Check your fuel pressure, and or injectors. You may have too much fuel getting into the engine causing it to burn rich and overheat the converters.

Posted on Apr 26, 2009

Anonymous

  • 70 Answers

SOURCE: can I clean my Maf sensor and throttle body myself

Yes it will help car run better. Take off any hose that goes to card so that you can see down throttle bore. Start car. Grab throttle linkage and figure out how to move it so that you can make the engine go faster. Begine to spray inside throttle body using little red hose that came with carb cleaner. While you are spraying the engine will try to cut out move the throttle linkage to speed up the engine so it won't cut out. Keep spraying all around inside and outside throttle bore.

Posted on Aug 07, 2009

Anonymous

  • 232 Answers

SOURCE: Unstable idle,rpm limited to 2500, 04 sentra se-r spec v

actually it works in battery. check the coil associated with the RPM meter or if your battery charge is low recharge it. You ll get it fixed :) Please rate this!!

Posted on Aug 16, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

2000 ford escort 2.0L. plugs, wires, coil pack, alternator, MAF sensor. hard to start and RPM around 1k wants to die (any stops) always runs rough. Says air intake sensor. catalytic converter or CCRM?


Have you cleaned the throttle body and throttle body valve? have you cleaned the idle speed control air bypass valve? are the injectors clean? Are there any fault codes in memory, do the things I mentioned if you haven't already. Also hard engine mounts can cause roughness at idle. Another thing is the timing belt tight?

Jan 27, 2017 | Ford Escort Cars & Trucks

1 Answer

Where is the throttle body and MAF sensor located on a 2008 220cdi diesel c class


Go to your local trusted garage and get car diagnostics scanned for faults. You may have a faulty egr valve or even a dirty throttle body etc. If you guess you might destroy the maf sensor. Expensive guess.

Jan 18, 2015 | Cars & Trucks

2 Answers

Camry stalling


Fuel filter,air filter,IAC sensor,Bring up low idle at throttle body is small set screw.

Jun 12, 2013 | Cars & Trucks

1 Answer

Only cranks and stay if I give a little gas. I have changed the converter, spark plugs & wires, and put fresh gas & treatment in the gas tank. If I hold idle over 1 RPM it runs smooth, but if i let...


Test the TPS Sensor & replace the front
O2 Sensors if they have 100,000 miles on them

Clean the MAF Sensor with CRC MAF Cleaner,
Spray the throttle plate with the CRC throttle body
cleaner

Check for vacuum leaks

You may have to have a shop smoke test the
intake & other items

Jun 09, 2011 | Ford Escort Cars & Trucks

1 Answer

Engine idles rough. Engine shuts off while coming to a complete stop unless revving engine


Rough Idle covers several symptoms. Do you mean Idle (RPM) goes up and down or do you mean it is too low and car tries to stall? Idle is dependent on fuel delivery and spark Depending on your mileage and driving style it is more likely an Idle Air Control valve, Mass Airflow Sensor or Throttle body. I would purchase CRC MAF Cleaner and CRC Throttle Body cleaner. you will need to disconnect the induction hose from the air filter and throttle body. On the Taurus/Sable the air filter is loated on driver side under hood. Trace back from it and mid way youwill find a plastic cylinder that is wired in with a plug. Unplug the MAF. Make sure and notate which side is facing the engine as the air flow has to be the right way. I put a dot on the side that should face inward to remember the flow direction. Find a ventilated area and take the CRC MAF cleaner and spray the inside of the Mass airflow from about an inch away. Be careful there are very fine wires inside that can be broken by the nozzle by touching or being too close when spraying. Spray liberally and then set aside to dry. Continuing up the intake you will find the throttle body whihc is a cirucular intake that is metalic It has a butterfly valve inside. Use the same CRC brand but this time us CRC Throttle body cleaner. DONT USE CARB CLEANER OR OTHER BRAND. Ford coats their Throttle bodies with teflon and any other brand can eat this lining away. Clean in short bursts. You can gently take a clean shop rag to wipe inside with your finger as sprayed to dislodge some of the dirt, but be gentle. Dont use stiff brushes.. A qtip, a soft bristle tooth brush with very light pressure. as well. Clean it very well. Place rag underneath to catch any run off. After its cleaned and teh MAF is cleaned, replace the air filter and reassemble the unit. The car will be hard to start at first. Turn it over a few times and it will start. It will sputter a bit and then should run better. Start with MAF and Throttle body first. then move to plugs..Finally, the MAF and Throttle body should be cleaned every other oil change.

Jun 28, 2010 | 1999 Mercury Grand Marquis

1 Answer

What would cause my car to idle rough?


Rough Idle covers several symptoms. Do you mean Idle (RPM) goes up and down or do you mean it is too low and car tries to stall? Idle is dependent on fuel delivery and spark Depending on your mileage and driving style it is more likely an Idle Air Control valve, Mass Airflow Sensor or Throttle body. I would purchase CRC MAF Cleaner and CRC Throttle Body cleaner. you will need to disconnect the induction hose from the air filter and throttle body. On the Taurus/Sable the air filter is loated on driver side under hood. Trace back from it and mid way youwill find a plastic cylinder that is wired in with a plug. Unplug the MAF. Make sure and notate which side is facing the engine as the air flow has to be the right way. I put a dot on the side that should face inward to remember the flow direction. Find a ventilated area and take the CRC MAF cleaner and spray the inside of the Mass airflow from about an inch away. Be careful there are very fine wires inside that can be broken by the nozzle by touching or being too close when spraying. Spray liberally and then set aside to dry. Continuing up the intake you will find the throttle body whihc is a cirucular intake that is metalic It has a butterfly valve inside. Use the same CRC brand but this time us CRC Throttle body cleaner. DONT USE CARB CLEANER OR OTHER BRAND. Ford coats their Throttle bodies with teflon and any other brand can eat this lining away. Clean in short bursts. You can gently take a clean shop rag to wipe inside with your finger as sprayed to dislodge some of the dirt, but be gentle. Dont use stiff brushes.. A qtip, a soft bristle tooth brush with very light pressure. as well. Clean it very well. Place rag underneath to catch any run off. After its cleaned and teh MAF is cleaned, replace the air filter and reassemble the unit. The car will be hard to start at first. Turn it over a few times and it will start. It will sputter a bit and then should run better. Start with MAF and Throttle body first. then move to plugs..Finally, the MAF and Throttle body should be cleaned every other oil change.

Jun 26, 2010 | 2001 Mercury Sable

1 Answer

Chevy truck '02 surges between 45 and 55 mph


you should change the tps( throtal position sensor) this can cause that problem

Aug 15, 2009 | 2000 Chevrolet Silverado

4 Answers

2002 Silverado code PO174


After fighting with mine (2003 GMC 5.3 liter), I believe I have it solved. Mine was throwing P0171 and P0174. Also, there was an occasional p0101. I had a rough idle sometimes right when I started it, but usually after 5 minutes when the fuel system went in to closed loop mode (about 200 RPM swings at idle that slowly went away). Days below 10 degrees were much worse.

I cleaned the MAF sensor, checked fuel pressue, changed spark plugs, and cleaned the throttle body. The code basically means that more fuel is being dumped in by opening the fuel injectors longer. The code is set by the long term trim on the injectors be over 23% (opened 23% longer than they should be based on sensor readings). The extra fuel allows the engine to run with the right air to fuel ratio (not necessarily lean as the code suggests). Causes could be low fuel pressure (from pump, fuel regulator, clogged injectors, and such). Running a scanner on it for several days, everything looked normal.

That is all background. The other cause is that air is being introduced into the intake after the MAF sensor. Extra fuel has to be added for the air that the MAF does not see. I did some digging and found out that the gaskets between the plastic intake manifold and cylinder heads are prone to leaking. I tried to spray throttle body injector around where it might leak to monitor the engine speed, but the air leak seems to be less on warmer days and leaks can occur on the inside edge of the gasket where it is hard to reach with the spray (there are foam ends that open the inside edges to atmosphere). I replaced the gaskets and my long term trim dropped to about 6% from 10% on warmer days to pegged out at 25% on cold days with a cold engine. The work isn't too bad as long as you are patient enough to get the plugs off of the ignitors. I have yet to test it out in cold weather, but I am pretty confident.

Jan 06, 2009 | 1999 Chevrolet Silverado 1500

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

Related Topics:

231 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

Marvin
Marvin

Level 3 Expert

85222 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

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

Answer questions

Manuals & User Guides

Loading...