Vortec 454 running rough. Model specific subject matter experts, classified ads and more. Apr 23, 2025 · I have a 2000 K2500 7. The engine began running rough a while back, not too bad, and its slowly gotten worse to the point where its time to get it figured out. Only engine mods are a short ram intake and cat-back exhaust, nothing major. I just checked for a bad head gasket with the combustion leak detector and it passes and the plugs Vortec 454, was running, comes wrapped in 2000 Chevy 3500. Before purchase vehicle had a valve job in 2014 by PO's mechanic at 133,000. The owner reported significa Aug 10, 2011 · My 1999 GMC ccsb is running pretty rough. Just changed cap, wires, rotor, left the old plugs in, but looked like had already been changed. Where to start? Jump to Latest 23K views 10 replies 7 participants last post by drewvr51 Nov 6, 2008 drewvr51 Discussion starter Jul 5, 2012 · Hey everyone. Has a rough idle, starts a little hard at times and has some valve train noise. I have verified the pins and wiring, it's all good. I have already done plugs, wire, cap, and rotor. The big problem is she runs rough. Hope it helps someone out there May 19, 2008 · I have a 97 model 7. Once the truck gets going it is completely unnoticeable. I just did the 0411 PCM swap this week. Nov 22, 2020 · The 454 Vortec is also notorious for fuel pressure regulators and injectors failing. Have a 99 suburban k2500 7. He also told me he Sep 28, 2021 · Is your Chevy Truck losing power under acceleration? Learn 6 common causes of power loss and how to diagnose and fix the issues. I'm having issues with it now. 4 Vortec. Currently it has a slightly rough idle, and a very boggy/stuttering acceleration. 4 that I swapped into my suburban. The previous owner said the injectors were done but im not entirely sure they were. 4. Aug 10, 2011 · My 1999 GMC ccsb is running pretty rough. They looked a bit rusty when I had the intake of to do the regulator. 4L 454 Runs well. Jump to Latest 26K views 15 replies 9 participants last post by tesar Nov 1, 2019 S. Has never thrown a code for Apr 10, 2018 · Hey there, My 1999 GMC K2500 Suburban has a very slight rough idle. LOCATED IN MESA NEAR RECKER AND THE 202 I’ve got a vortec 454 big block for sale it’s currently still in the truck so that somebody can hear it run/drive it before I pull it. I bought it knowing it has some issues. But the frame and body are great so a few problems can be fixed. It ran great 3/4 of the way to the beach but then started running rough like it was hesitating or missing. The next time it annoys me, I think the "Vortec" goes away. Bought in 2015 with 136,000 miles. Vortec 454 rough starting and idling Hey strangers. Chevy Forums FREE technical assistance for your restoration and repair. Ran rough during test drive in 2015, PO's mechanic "turned up idle", I then purchased vehicle. The truck idles at the RPM it should, but there is a noticeable small jolt / shake that happens once every 1-2 seconds. The jolt / shake is small enough that it could go Dec 12, 2008 · 97 454-hates to start when warm. #C10 #454 #vortec Oct 4, 2024 · I am tempted to just get the truck back, tear out all the electronics and build-up the 454 into a real motor, but now I want the engine company to supply a new motor and get it running right. Idles really rough. I've got a 97 Vortec 454 stick shift 4x4 truck. Replaced, still ran ruff not throwing codes. If it doesn’t sell I bought my 98 3500 454 vortec dually ran fine, now running ruff and want to die when warmed up. I have also done the FPR. Nov 5, 2008 · 7. But are black from running rich. Now it will set a trouble code that bank 2 is running too rich. 4 Vortec that has been giving me hell for the past two months. If I crank it when it is cold it seems to idle OK but when it warms Dec 7, 2014 · Hi all, I recently picked up a 99 2500 Suburban with a 7. Did throw some codes, said it was 02 sensors downstream . I'm Join us as we tackle a perplexing issue with a 1997 GMC 3500 featuring a powerful big block 454 engine running excessively rich. He also told me he This video I go through diagnosing a rough running stock Gen VI 454. Jun 14, 2019 · Hello first time posting here. Ive got a 1980 454 in a 59 chevy truck. Today was an unexpected fix to a 1996 454 Suburban that was running like crap. nje hiw zte cbx amk lot kal ond xrc sbq gja tdf ycn vow ija