2005 Sierra Stutters - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bluec10 · 08-06-2013, 03:16 PM

My 2005 Sierra w 4.8 is giving me some grief. After the engine is warm the engine will sometimes miss while driving on the highway. It feels like an engine stutter. RPM drops about 1000 then comes back right away. It might happen 2 or three times in quick succession then go away for the rest of the trip.

At first I was working on the assumption that the problem was electrical. I've found other online posts that mentioned poor contact at the battery or a poor battery ground connection. Checked and cleaned those.

The last time it happened I was looking right at the tach and noticed that it wasn't a momentary total electrical failure as I first suspected, but just a quick series of 1000 rpm stutters. When it stuttered I stepped on the gas, the truck speeded up, and the problem went away. It didn't return for the rest of the trip.

Some have suggested fuel pump issues. I'd like to be a bit more sure about that before I commit to a big job like changing the pump. I ran a code scan before and after the trip an there were none.

I have cleaned the MAF sensor and did a Seafoam treatment through the intake manifold. Clean air filter. Changed gas stations for the last tank to make sure it wasn't the fuel.

Have not checked the fuel pressure yet.

Ideas?
Posted via Mobile Device

08-06-2013, 03:16 PM	#1
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	2005 Sierra Stutters My 2005 Sierra w 4.8 is giving me some grief. After the engine is warm the engine will sometimes miss while driving on the highway. It feels like an engine stutter. RPM drops about 1000 then comes back right away. It might happen 2 or three times in quick succession then go away for the rest of the trip. At first I was working on the assumption that the problem was electrical. I've found other online posts that mentioned poor contact at the battery or a poor battery ground connection. Checked and cleaned those. The last time it happened I was looking right at the tach and noticed that it wasn't a momentary total electrical failure as I first suspected, but just a quick series of 1000 rpm stutters. When it stuttered I stepped on the gas, the truck speeded up, and the problem went away. It didn't return for the rest of the trip. Some have suggested fuel pump issues. I'd like to be a bit more sure about that before I commit to a big job like changing the pump. I ran a code scan before and after the trip an there were none. I have cleaned the MAF sensor and did a Seafoam treatment through the intake manifold. Clean air filter. Changed gas stations for the last tank to make sure it wasn't the fuel. Have not checked the fuel pressure yet. Ideas? Posted via Mobile Device __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.