Question about 2004 Chevrolet Silverado 1500 Crew Cab

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04 silverado rough idle wants to stall when stopping Help please

I have a 04 silverado 5.3 4x4 with a rough low idle. When im stopping it gets lower and almost stalls. And right before i stop it feels like my brakes just stick. The volts show low all the time but the battery and alternater are good. Im thinking a short somewhere? I cleaned the throttle body and iac valve and now when i start the truck it revs up to about 1500 then goes way down. When stopped if i turn the ac on or off it revs up to 500 then way down again and stays there. I had the code 0446. Could the evap stuff be responsible for all this? Also it seems like my fuel mileage has dropped alot and the gauge kinda moves around more than it should. The odometer now reads 16 miles and it says I get 2.8 mpg. The brakes are acting up too. I dont know if its related at all but they shutter when im stopping and it feels like i get stuck right before im completely stopped. Ive changed the front rotors and pads so far. I also had a code for engine coolant too hot and a knock sensor awhile back. I cleared the codes and none have come back. And I had a leak for awhile where the tranny line goes into the radiator and it gunked up that area of the engine compartment. Mostly all over the right front brakes up to the radiator. Its cleaned now but idk if that could mess up a sensor or something. Please help

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  • Anonymous Sep 15, 2009

    I believe there is fuel pressure. When you say vacuum leaks is that just from the air filter to the throttle body? And how do you check the o2 and throttle position sensor? thank you for responding

  • Anonymous Sep 15, 2009

    thank you for the information im gonna go get started

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Check o2 sensors, and throttle position sensor as well as any vacuum leaks. Make sure you are getting plenty of spark and fuel pressure.

Posted on Sep 15, 2009

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  • Nate Stansfield
    Nate Stansfield Sep 15, 2009

    You can test any sensors with an ohmmeter and check the resistance. You can also test the wiring and power to the sensor as well this way. Is your check engine light on? If so, I would have your engine codes read to pinpoint exact problem area location.

    If you have more than a couple problems wrong, and they all seem like elctronical problems, then I would have a diagnostic scan ran on your car's computer.


  • Nate Stansfield
    Nate Stansfield Sep 15, 2009

    When I mean vacuum hoses, I mean from egr, map, air filter, and any other hoses. You can test it with a vacuum pressure tester.

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  • 5 Answers

I have the same problem with my 04 silverado 5.3 I notice that when I'm on idle the motor is vibrating like if there is something missfiring. I turn on the a/c and the rpm are higher and rough when I come to a stop. If you find solution please help.

Posted on Oct 15, 2009

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Posted on Jan 02, 2017

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SOURCE: Short in the odometer

better just to get another one from a salvage yard. real easy to change out vs. sending it off to be rebuilt

Posted on Jun 04, 2009

  • 5 Answers

SOURCE: 2004 silverado has p0446 evap code and very low

I had the problem with my 04 silverado odometer malfunction. There was a recall for this model and year. Took it to the dealer had it fixed for free, you need a new odometer replaced but it only covers warany for 7yrs or 75K miles then its prorated.

Posted on Oct 15, 2009

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1 Answer

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It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues.Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----
Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

-----------
Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

------------
1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?

http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

---------
Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------------
Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

-----------


Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

----------
Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

-----------
GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

--------


GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

-------------
1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

------------
Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

-----------
Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

---------

High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

-------
While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------
Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

--------
High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-------
Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

----------
Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

-----------
While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

These details will help.

Thanks.

Nov 24, 2012 | 2001 Ford Taurus

1 Answer

At a stop very low idle like it is going to stall


try this when your stopped apply your e brake release the brake pedal does the idle increase? push on the pedal idle get rough or lower? this usually points to a vacum leak check for loose or broken vacum hoses

Oct 04, 2010 | Mazda 929 Cars & Trucks

1 Answer

04 silverado P0446 low idle


Sound to me like the computer has gone into "limp" mode, it is working just good enough to make it to a repair center. At this point it needs to go on an analyzer and make the necessary corrections then the computer will have to reset it self. Some analyzers can get rid of the bad code and the computer will come back by it self. But something has gone bad and the computer is compensating for it.

Feb 11, 2010 | 2004 Chevrolet Silverado

1 Answer

2004 silverado has p0446 evap code and very low idle at stop. shows low volts as well. My question tho is why does my odometer read 16 and its telling me im getting 0.1 mpg and all the other readings are...


I had the problem with my 04 silverado odometer malfunction. There was a recall for this model and year. Took it to the dealer had it fixed for free, you need a new odometer replaced but it only covers warany for 7yrs or 75K miles then its prorated.

Oct 10, 2009 | 2004 Chevrolet Silverado

1 Answer

Truck dies when i stop or slow down


this may be the cause, try it and see if it helps, it is a very common cause of problems like yours.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Mar 03, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Starts but stalls when put in gear


Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Mar 03, 2009 | 1999 Chevrolet Silverado 1500

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