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You are in the Chevrolet Silverado & GMC Sierra
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GMC Sierra 1500, Truck
#95 of 151 2003 stalls when slowing down
Dec 14, 2010 (11:33 am)
I work out of town for 2 weeks at a time. Truck ran fine when I left it in the garage. No one drove it while I was gone. Started fine, went to town and it stalled at a light. It seems to idle fine, especially when first starting, but dies when rpms drop. Drives fine, lights don't go dim, alternator is okay according to gauge. changed battery. No codes or engine lights come on. truck is an 03 sierra 4.8 liter. always garaged and maintained. Seems to die when I slow down and come to a light or whenever I the rev the motor and release, the rpms drop and it stalls, but fires right back up. I do see a slight voltage drop when turning on all lights and heater and radio, but never falls below 14.5. Any help would be appreciated, money is tight as all can attest.
#96 of 151 Re: 2003 stalls when slowing down [richardo21]
Dec 15, 2010 (7:11 pm)
Sounds like a bad throttle position sensor. I would start there.
#97 of 151 Re: Rough Idle, stall, and missfire during cold temps. [kenakin]
Jan 21, 2011 (5:41 pm)
My truck is doing the exact same thing only when it's cold but today it finally stalled out so i replaced the fuel filter and no luck any one have any suggestions please help!!
#98 of 151 Re: 2003 stalls when slowing down [richardo21]
Feb 09, 2011 (9:56 am)
sounds like carbon build up on your throttle plates. just spray it down and wipe it off
#99 of 151 2000 GMC Sierra Difficult to Start
Feb 22, 2011 (6:28 am)
OK, I have a problem that I've bounced off of several folks and not gotten a good answer on, so hopefully someone here can help me out. I have a 2000 GMC Sierra, 4.8L V8. The truck starts and runs fine cold or hot. However, if you let it come up to temp, then cool part way down - about an hour - it acts like there is no fuel getting to it. I can't explain why, but if I puch the accellerator to the floor and let it crank for about 5 seconds, it starts, idles rough, then goes on as if nothing happens. This has been a problem for about 6 months. Any suggestions???
#100 of 151 2002 Sierra Cold Engine Idle & Stalling
Feb 26, 2011 (4:57 am)
I have a 2002 5.3 4X4 Sierra with 137,000 miles. Recent work done was crank shaft positioning sensor (fall 2010), cad. convertor, fuel pump, oem gas cap (in Feb 2011). Two codes of P0440 in the past 3 weeks since the fuel pump was replaced. After the truck sits for 8+ hours (at work) it starts fine and idles around 1000 to 800 rpm. Put in gear and it begins to rough idle at 700 to 500 rpm until the throttle is depressed. It seems to run fine but at a slightly higher idle then norm. Once stopped at a intersection it idles down to 5-600 rpm and dips down to 300 then wants to stall out. It does restart right back up with similar symptoms, but once the engine warms up (15 minutes at highway speed) it seems to idle fine and does not want to stall out. Unkown if the fuel filter was cleaned or replaced with the fuel pump installed or if all fuel connections are sealed at installation. I am expecting the P0440 code to come back as it has after 5 days of being cleared. ANY THOUGHTS?
#101 of 151 Re: 2002 Sierra Cold Engine Idle & Stalling [jekokmey]
Feb 26, 2011 (8:26 am)
That's similar to what mine is doing though I've only replace the throttle position sensor so far. That didn't fix it but the old sensor definitely had too much play in it. Will post an answer if I ever fix it. More frustrating than anything.
#102 of 151 Re: 2002 Sierra Cold Engine Idle & Stalling [metallurgist1]
Feb 26, 2011 (3:50 pm)
Have you changed or cleaned the idle air controller?
#103 of 151 Re: Rough Idle, stall, and missfire during cold temps. [kenakin]
Jul 28, 2011 (9:32 am)
Did you ever get this fixed? my Silverado does the exact same thing, runs great if I unplug the MAF, replaced the MAF still same problem. I also replaced map sensor, TPS, cleaned TB and replaced gaskets. thanks
#104 of 151 Re: 93 gmc stalling [mgalde]
Sep 22, 2011 (8:00 pm)
I have since fixed the problem.
I sold the truck, to a co-worker.
The issue was a degraded connection at the cap. The two wire connector at the top had corded soo badly that it was only making intermittent connection.