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tried to start camaro and it went chunk ...

Richcz28

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Moving some cars around today. I started my camaro up for the first time since the end of the summer.

This car has a completely stock 1984 z28 with a rebuilt 305 with holley rebuilt e4mc qjet. Everything was new in 2009. New plugs, wires, ignition coil in 2010. It has an inline holley fuel regulator and if i remember right it is set to 5 or 6 psi(if that's the correct unit).

Put it away with like 1/8 tank of gas in a heated garage. The battery was disconnected. I reconnected the battery and after about 8 cranks she fires right up. I pull the car out and let it idle in the driveway. It's running a bit rough and the exhaust smells a little gassy. I ran it for about 5 minutes and she smoothed out a bit, but then stalled. I started it up and it stalled repeat about three times. I figured maybe my gas was a bit old so I grabbed a can and picked up a couple gallons of 93 and put it in. I was doing some other things and let the car sit for a couple hours. I came back started the car again and it was still running a little rough and I had to hold around 1700 to get it to run smooth. While running it this time I get a check engine light. I shut it down to get code 45 which is oxygen sensor rich. I disconnected the battery to clear the code and run it again to see if it came back. I cranked the car about three times and it wouldn't start. I was starting to think I flooded it. I tried to start it once with my foot to the floor, but no luck. I left the car and went to eat dinner. I come back out and try to start it and it cranks three times and goes chunk. I try to crank it again and immediately I hear chunk. So now I'm here. This does not sound like a dead battery, the starter is not clicking. It sounds like the engine cannot turn over?
 
I would bet that the needle stuck open in the carb and was flooding it while running and then while you left it sit, enough raw gas got into the engine to hydraulic lock a cylinder. Don't try to crank on it any more until you get it unlocked. The best way is to pull the spark plugs out, DISCONNECT the ignition and then crank it over, or crank it over by hand. The carb may unstick after getting some clean gas in it, but it would be best to pull the top to clean and check. You may want to check for gas in the oil also.
 
Ok I'll def pull the plugs and see where that gets me. I won't be getting back into it until the morning.
 
No really bad noises and everything under the hood looked copacetic.
 
check your oil level and smell too.... if high or gassy, change it...

when ya pull plugs, if ya get gas out of the cylinders, put a few squirts of Marvel in each cylinder and roll it over again a few times before putting fresh plugs back in it...... that'll get it's compression back if the cylinders got washed out......

oh, and often a couple wraps of a plastic screwdriver handle on the float bowl will free up a stuck float/seat.... also leave the air cleaner off and make sure it's no longer dumping fuel...
 
I don't have any marvel sitting around. Should I pick some up or will 10:30 do?
 
eh, ya want something a bit thinner than that.... you could just give em a healthy spritz of WD-40, or even a bit of tranny fluid...
 
Got the car pushed back inside. Oil def smells gassy but not overfilled. I'll be picking up oil and plugs in the am.
 
Ok halfway through fighting my plugs out past my headers. They definately smell like gas. Didn't get new ones yet and was thinking about trying the header specific plugs. I always try to run acdelco and the current plugs are r45ts. None of my wires touch or are melted but I forgot how much it sucked to get a wrench on these. Has anyone tried the header spark plug style?
 
All the plugs are out...


Im contemplating the accel 0576s summit lists this plug as having a resistor as opposed to 0276s which does not. Accel recommends the 0576s for my application and summit recommends both plugs. I don't really understand enough about plugs so I do not know which would best for my application? Both of these plugs are "shorty" plugs for headers
 
Resistor plugs are for suppression of RF noise caused by the ignition system. It used to be mainly to keep the noise out of the radios, but when the early computers started coming out, some of them had problems with the noise causing them grief.

They are not as picky these days, but it still a good idea to use the resistor plugs unless you are doing all your driving at the track.
 
Just cranked it with the plugs out and gas squirted out like a super soaker

After further inspection most fuel probably came out of cyl 3 with a little evidence in gas in a couple other cylinders
 
All the plugs are out...


Im contemplating the accel 0576s summit lists this plug as having a resistor as opposed to 0276s which does not. Accel recommends the 0576s for my application and summit recommends both plugs. I don't really understand enough about plugs so I do not know which would best for my application? Both of these plugs are "shorty" plugs for headers

I have run the 576s's a couple times and had good luck with them. They really do make it easier when you have the headers, but only with stock heads. When I switched to aluminum heads, the plugs are sunk down in a bit and the standard AC plugs actually work better.

And nice Camaro BTW. I also own a few third gens and have owned several more in the past.
 
Thanks usskoval this is my first third gen but I had another 84 for awhile while my engine was out of this one. I tell myself I would never get one again until I see one drive by in that orange color they had for a couple years and I'm like maybe I'd make an exception.

the inside is really my favorite part of this one

009.jpg
 
so now that I am pretty confident I locked the engine up with gas where do I go from here? I obviously don't want to restart it to fill it up with fuel again.

ryoken I like your suggestion of wacking the carb with the butt of a screwdriver. I just don't want it to not be enough to fix it...

I have been in the top of these carbs a couple times and, but only to change a mixture control solenoid and floats. It has been a few years. I probably need to replace that top gasket while I'm at it? Is it worth going inside and what am I looking for? Or is it just to spray down with carb cleaner with the hope of clearing out some debris?
 

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