Slow Idle- 04 Sierra - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chlorin8ed · 07-31-2011, 02:00 PM

When I come to a stop sign, it will idle at 400-500 rpm for the past 2-3 weeks. I have cleaned the air filter (k&n) and Mass air sensor. I am pretty sure I do not have a IAC valve or even a MAP sensor. Related or not, I can not spin the tires no matter how hard I try. Low idle doesn't seem to affect its driveabilty other than the slow idle. No codes either.

Has anyone experienced this? Any suggestions what to look for??

Thanks

navysnipe · 07-31-2011, 03:51 PM

I have a 01 silverado that would idle slow and sometimes quit when I started it. It has a 6.0L, I replaced the IAC and that did not help then I replaced the fuel filter and the fuel pressure regulator and that fixed it. the Fuel filter had actually fallen appart internally and was blocking the outlet. You can test the fuel pressure at the test port on the fuel rail. I used an old set of refrigerant gages and verified the pressure after I changed the regulator and filter.

Hope that helps
Navysnipe

Chlorin8ed · 07-31-2011, 04:23 PM

Thanks Navy
I hope it is not the fuel filter (it is all one piece with the fuel pump!

) I will have to see if I can find someone to help me with that.

clinebarger · 07-31-2011, 06:57 PM

Clean the throttle body bore.

Chlorin8ed · 07-31-2011, 09:33 PM

I did a while ago, but I will definitely do it again.

navysnipe · 07-31-2011, 09:47 PM

Fuel filter is under the drivers side on the inside of the frame... Mine is anyway. My throttle body was getting dirty and the only thing that it was causing was a sticky throttle(closed). I just adjusted the stop screw a little bit more open and the IAC compensated for that and the idle settled down where it was supposed to.

Navysnipe

Chlorin8ed · 08-07-2011, 06:34 PM

I have cleaned the Mass Air Sensor and the Throttle Body. Still no luck. It does seem to idle a tad better but still not normal.

According to autozone, I dont have a IAC valve

, my fuel filter is in the fuel tank with the fuel sending unit

I can have the truck floored and it won't even break a tire.

I don't have a clue

PS: Still have no codes

GASoline71 · 08-07-2011, 09:39 PM

My online repair manual shows the fuel filter for an '04 Sierra on the frame rail.

Gary

spudz · 08-08-2011, 08:44 PM

your fuel filter is built into the fuel pump module NOT on the frame rail. And also. My 04 z71 wont spin a wheel ever since it was brand new. Your iac, is basicly built into your TB. I would check what your fuel pressure is and go from there. The spec is different for whatever engine you have a 5.3 T engine and a 5.3 Z engine are different pressures.

07-31-2011, 02:00 PM	#1
Chlorin8ed Registered User Join Date: Feb 2011 Location: Iowa Posts: 20	Slow Idle- 04 Sierra When I come to a stop sign, it will idle at 400-500 rpm for the past 2-3 weeks. I have cleaned the air filter (k&n) and Mass air sensor. I am pretty sure I do not have a IAC valve or even a MAP sensor. Related or not, I can not spin the tires no matter how hard I try. Low idle doesn't seem to affect its driveabilty other than the slow idle. No codes either. Has anyone experienced this? Any suggestions what to look for?? Thanks __________________ 1987 Chevy R10 2004 GMC Sierra 1980 Chevy Malibu

07-31-2011, 03:51 PM	#2
navysnipe Registered User Join Date: Apr 2008 Location: Sabattus, Maine Posts: 84	Re: Slow Idle- 04 Sierra I have a 01 silverado that would idle slow and sometimes quit when I started it. It has a 6.0L, I replaced the IAC and that did not help then I replaced the fuel filter and the fuel pressure regulator and that fixed it. the Fuel filter had actually fallen appart internally and was blocking the outlet. You can test the fuel pressure at the test port on the fuel rail. I used an old set of refrigerant gages and verified the pressure after I changed the regulator and filter. Hope that helps Navysnipe

07-31-2011, 04:23 PM	#3
Chlorin8ed Registered User Join Date: Feb 2011 Location: Iowa Posts: 20	Re: Slow Idle- 04 Sierra Thanks Navy I hope it is not the fuel filter (it is all one piece with the fuel pump! ) I will have to see if I can find someone to help me with that. __________________ 1987 Chevy R10 2004 GMC Sierra 1980 Chevy Malibu

07-31-2011, 06:57 PM	#4
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: Slow Idle- 04 Sierra Clean the throttle body bore.

07-31-2011, 09:33 PM	#5
Chlorin8ed Registered User Join Date: Feb 2011 Location: Iowa Posts: 20	Re: Slow Idle- 04 Sierra I did a while ago, but I will definitely do it again. __________________ 1987 Chevy R10 2004 GMC Sierra 1980 Chevy Malibu

07-31-2011, 09:47 PM	#6
navysnipe Registered User Join Date: Apr 2008 Location: Sabattus, Maine Posts: 84	Re: Slow Idle- 04 Sierra Fuel filter is under the drivers side on the inside of the frame... Mine is anyway. My throttle body was getting dirty and the only thing that it was causing was a sticky throttle(closed). I just adjusted the stop screw a little bit more open and the IAC compensated for that and the idle settled down where it was supposed to. Navysnipe

08-07-2011, 06:34 PM	#7
Chlorin8ed Registered User Join Date: Feb 2011 Location: Iowa Posts: 20	Re: Slow Idle- 04 Sierra -Follow up I have cleaned the Mass Air Sensor and the Throttle Body. Still no luck. It does seem to idle a tad better but still not normal. According to autozone, I dont have a IAC valve, my fuel filter is in the fuel tank with the fuel sending unit I can have the truck floored and it won't even break a tire. I don't have a clue PS: Still have no codes __________________ 1987 Chevy R10 2004 GMC Sierra 1980 Chevy Malibu

08-08-2011, 08:44 PM	#9
spudz Registered User Join Date: Oct 2005 Location: Branchville SC Posts: 1,647	Re: Slow Idle- 04 Sierra your fuel filter is built into the fuel pump module NOT on the frame rail. And also. My 04 z71 wont spin a wheel ever since it was brand new. Your iac, is basicly built into your TB. I would check what your fuel pressure is and go from there. The spec is different for whatever engine you have a 5.3 T engine and a 5.3 Z engine are different pressures. __________________ 2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks..



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