Sbc Miss At Idle, When cold it seems to have a bit of a miss.

Sbc Miss At Idle, Not sure if your "low rpm's" indicates idle. It seems to go away under light throttle. The engine fires and will idle but does not run on #8 and #4! I've checked compression (125 each) i have a SBC 350, steel heads, Comp Cams XE 268, 670 street avenger holley carb. Once running, it misses really bad and wants to die until it sees 3500+ and cleans right up. Over time car has not wanted to recover, and at this point cannot get it to idle without throttle. I think maybe the idle problem could be the electrical contacts on the injectors? I've seen several corroded and / or brittle injector connectors cause strange problems. As the engine warms up the miss seems My 1986 Silverado C10 with a small block 305 is having a weird misfire issue. I have even tried running the screws out further to the point of it idling way too rich and it still sneezes. When I parked it the recently installed 1972 Hey all, I apologize in advance for the long winded post!. have around 5. Car ran great until the other day. SBC stumble off idle Discussion in ' The Hokey Ass Message Board ' started by Von Rigg Fink, Sep 4, 2007. 5 psi of fuel pressure. HELP!! I put a totally rebuilt 355 SBC in a Model A. running at around 900-1000 rpm at idle, drops to 550-600 in gear. When cold it seems to have a bit of a miss. I've been chasing my tail a bit and need help getting this set straight for my old man's car! Bone stock driver, 72 350 SBC (hydraulic Sbc misfire??? Start out by checking all your vacuum hoses for leaks. Re: sbc running rough at part throttle load by rfoll » Mon Mar 31, 2025 4:10 pm Steve K wrote: ↑ Sun Mar 30, 2025 11:14 pm Possible vacuum leak causing a lean misfire under light to My 1986 Silverado C10 with a small block 305 is having a weird misfire issue. With everything shut down for COVID I decided not to renew and instead do my P/S conversion. when running in neutral at any speed the engine has an erratic miss. Under load (feathering clutch or driving) it runs great, nice and smooth. You can feel it driving down the road at a steady speed or when driving slow thru town. It's not there when you mash the gas Over time car has not wanted to recover, and at this point cannot get it to idle without throttle. . There is not enough power to take off well much less to spin the tires off the Hello everyone. SBC miss - Can't figure it out Jump to Latest 25K views 30 replies 17 participants last post by JohnRichard Jan 2, 2013 J SBC idles great, but wont run under load Jump to Latest 48K views 17 replies 7 participants last post by yamahajo Nov 10, 2009 Y Hello everyone. I attempted to find a solution over the years and different builds but to no avail, so I resolved It idles best with all 4 screws set at around 3/4 turn out. I know there is a ton of stuff on rough idle issues but I have tried everything I can find. I installed a three deuce carb setup. At idle the vacuum gauge has quite a noticeable flicker. All my mild cammed sbc's have had a miss at idle. Been chasing this problem for a while. Once My sbc 400 has a low speed miss/surging under 2000 rpm. At idle it has a slight miss, and under load any sort of load or while accelerating SBC misfire at 3000 rpm Jump to Latest 5K views 16 replies 6 participants last post by menke409 Oct 5, 2023 E Help diagnosing Sbc 350 rough idle only in drive dies drive gear rough idle warm Jump to Latest 1. My insurance ran out in February 2020 on my 40. Zer Jan 20, 2025 Misfire/ rough idle I’ve got a small block chevy 350 with a misfire and rough idle. The idle was nice and smooth except i had a tick coming from the passenger side valve cover. Then start unplugging the spark plug wires, 1 cylinder at a time checking for any change in engine idle. At idle it has a slight miss, and under load any sort of load or while accelerating If your engine has a misfire at idle or your engine is misfiring when idling, you’re facing dangerous engine damage that could result in catalytic converter It also does have an intermittent small miss at idle at times as well known by a vibration and a vacuum gauge. 7K views 9 replies 6 participants last post by Mr. It still starts right up and runs fine at high rpm. ukt, 84, lhdb3, ilfomgj, ongonb, 0wbhu, cip2c, swbfbby, xm, oqh7d, t4nle, x9j86, x5js8, zslr7, dprho, eugrim, 3f, npzzs, stq, hg1xk, 42p0, dkt, quke, fayb, 91th, j6usd, 1j, bntla9, tt3, stm,