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Old 06-08-2011, 05:31 PM
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timing/low speed stalling chevy 350

looked around and cant find any threads about my exact problem.

'67 camaro, zz4 350 bought 3 yrs ago- short blk- from summit, old dist with protonics elec ign... that pertinents anyway ... problem wasnt running, but stalling at low speeds/rpm. ran and idled great and smooth, but go to drive it and it stalls. if you hammer down and buzz thru the gears, goes great, and runs smooth at constant speed. thought timing or running lean could cause low speed/rpm stalls so double checked metering block mix screws- set good- when went to check timing, timing mark running about 11:30/12:00, but my timing tab has 0/tdc around 2:30. when i try to approach that by turning dist, idle drops, timing skips around for cpl secs and car dies- even if try to balance idle by turning up idle on carb while turning dist. Thought might be a tooth off so pulled dist and reset, but to my surprise, timing is still in exact same spot after?! dist is pointing to #1 at tdc, firing/wire order double checked. is it the cam/timing chain thats off? is my motor tdc supposed to be at 12:00 not where my marks are? timing cover, balancer, timing mark tabs all from older 350 (maybe 70's?). its difficult to check exact tdc so far bc for some reason balancer center nut will turn and balancer/pistons/etc dont? another of lifes mysterys. Please help. been building this car 5+ years and time to drive it more, work on it less i was hoping! Thanks!!

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Old 06-08-2011, 08:43 PM
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I would first make shure you establish true piston TDC in relation to your balancer. Piston stops are available that screw into the spark plug hole which will allow you to obtain piston TDC.
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Old 06-09-2011, 01:13 PM
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It's does sound like timing but did u also check the accelerator pump on the carb?
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Old 06-14-2011, 08:56 PM
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accelerator pump is in good working order. its a brand new holley street avenger- used less than 100 miles- but in my world that has also been like 3 years. guess i could double check I am going to get the piston stop tool and go about this systematically. i talked to my uncle who owns a shop and he said that he could take it in and get it figured for me, but i dont want to give up- i want to figure this thing out. does make me feel a little better i didnt get 50 responses of the same thing "you dummy, its this___" ... makes me think you all might be a fuzz stumped like me
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Old 06-26-2011, 11:52 AM
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Well- I did get it partially figured for anyone who might find this with a similar problem. always nice to have a solution to the mystery.

I bought and used a piston stop tool- very handy and cleared up any question that things were off. also replaced anything else that could be causing probs that i overlooked- cap, rotor, wires, plugs. after using piston stop ,determined timing tab just wrong for my applc obviously... (no thanks to summit who sold me the zz4 and said that i had the correct one. i would really question and technical advice from these guys- even for their own products. i should have called GM instead). my new TDC ended up about 2" from old mark. bought and installed new timing tape. Put it all bk together and it started right up- now set to initial timing at 12btdc. It was late so didnt get a test drive in, but im hoping low speed stalling got fixed in the mix...

if not... any ideas for causes of low rpm stalling? checked for vac leaks already...
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