81 el camino stalls when hot

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jim williams

Not-quite-so-new-guy
Jun 12, 2015
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Hi all,
I'm new to the forum. Hopefully this is the right forum for my problem. This going to be a long post but I want to give as much info as possible.
I just got an 81 El Camino with a 229 v6 and a 3 speed on the floor. It is 100% stock with 79k on the odometer. The guy I got it from said he found it in a barn where it had been sitting for about 10 years. It's in pretty decent shape, but it doesn't run right. He told me the electric choke didn't work so he converted it to a manual choke. He removed and cleaned out the fuel tank when he first got it, but then he lost his job and had to sell it.
When I test drove it, it seemed to run great. The only thing I noticed was a slight tick coming from the engine- maybe a valve, maybe an exhaust leak. I haven't looked into it yet. When I picked up the car, I stopped for gas and then the problems started. About 5 minutes after I left the gas station, the car started bucking and seemed like it wanted to stall, but then it cleared up after about 30 seconds so I kept going. We stopped at a diner for lunch for about half an hour, and about 10 minutes after we left the diner the car started bucking and trying to stall out again, but this time it didn't clear up. I pulled over and the car stalled as soon as I pushed the clutch in. I didn't see anything obviously wrong when I popped the hood. I started it back up and it idled fine so I tried to continue on my way but only made it about 100 yards this time before it started acting up again. Then I had it towed the rest of the way home.
At home, I replaced every vacuum line under the hood because they were all dryrotted and cracked. I replaced all the spark plugs and wires, one at a time so I wouldn't mess up the firing order. The plugs looked good, and 4 of the wires looked ok. 2 of the wires were really bad though, massive cracks in the insulation and caked with grease, so I'm sure that was part of my problem. The car was hard to start after that, and the manual choke wasn't adjusted right so it was basically useless. I got it to idle by holding my foot on the gas pedal just far enough to get the rpm's up around 1,000 until it warmed up, then I took it around the block. It was better, but still not right. I then changed the fuel filter in the carb, but it looked fine. Last night I pulled the electric choke off an old q-jet from my camaro and ran a new wire for it to the wiper motor. I tried to start it, but now the battery is stone dead. My voltmeter showed about 150mV when I checked the battery. The battery is on the charger now but I'm probably going to get a new one anyway.
I didn't replace the cap or rotor yet, but that's probably next on the list. What else should I be looking at? It seems like it only acts up when it's hot. When I look down in the carb (rochester dualjet) while working the throttle with the engine off, it looks like it's squirting gas in there pretty good and both jets look like they are squirting the same amount.
When I get out of work today I'm going to mess around with it some more, but I need some advice on where to go from here.
Sorry about the wall of text, but like I said, I'm trying to be as descriptive as I can. Any help is appreciated.
 
I think you should have parked it until you change all the fluids, rebuild the carb and put back an electric choke and do a full tune up.
 
I think you should have parked it until you change all the fluids, rebuild the carb and put back an electric choke and do a full tune up.
I do plan on changing the oil and filter, along with the coolant, dist. cap and rotor this weekend. Is there anything else I should do or check, other than the carb rebuild?
How much of a pain is it to rebuild a dual-jet? I've had holleys and edelbrocks and lots of small engine carbs apart before, but never a rochester.
 
I would change the rear end oil as well, for the carb best to get a good book and there is some instructions online along with videos. I get something to soak the carb in before you take it apart to clean the deposits that are left behind from fuel. You can use diesel fuel to soak it in
 
Thanks Pontiacgp. Does anyone know of a good book for this? Googling "rochester dualjet 210 rebuild" only brings up rebuild kits or other people asking questions about them. I was checking on Amazon and found two books, but one is geared more towards quadrajets and alot of people were saying the Haynes book wasn't that good. I couldn't find any videos on youtube for a dualjet. Are they similar enough that I can figure it out by watching a q-jet rebuild video?
 
You might want to try soaking it in the diesel fuel and try it out to see if that cleaned it up. That trick has been known to cure a few carbs that have been sitting around with fuel in them
 
You might want to try soaking it in the diesel fuel and try it out to see if that cleaned it up. That trick has been known to cure a few carbs that have been sitting around with fuel in them
OK. This is probably a dumb question, but can I throw the whole thing in a bucket of diesel while its together? I'm assuming I would still need to take the sensors out of it first if I can throw the whole thing in
 
Yeah it has two things plugged in to it. One is on the front drivers side by the throttle cable and the other is on the passenger side on top near the front. No idea what they are, my repair manual isn't here yet
 
Never thought of cleaning a carb with diesel. Gonna have to give it a try as im having similar problems
 
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