Question about 1985 Chevrolet El Camino

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1985 el Camino 305 Rough Idle and Automatic Choke out

85 el Camino running great, then suddenly rough idle (shuddering) and auto choke not working at same time,

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If electric choke not working and blade on carb is not fully opened, that would cause your issue...check for power at choke stat, if not, check fuse

Posted on May 08, 2014

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Posted on Jan 02, 2017

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SOURCE: Choke Light rough idle

adjust your carb, the 2 screws on each side of the carb adjust so you can get the car to idle correctly, also check your distributor

Posted on May 26, 2009

wireguy212
  • 1627 Answers

SOURCE: engine idles high like it has a automatic

first thing to check is the base gasket on the bottom of the throttle body.if it's sucking air it will idle too high.if that's not the problem the you likely need a throttle posion sensor.

Posted on Sep 30, 2009

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adjust your carb, the 2 screws on each side of the carb adjust so you can get the car to idle correctly, also check your distributor

May 26, 2009 | 1985 Chevrolet Chevy

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My 1981 chevy El Camino V6 3.8L 229 idle gets high when engine is hot and when engine gets cold idle drops not sure why can i have any suggestions


Sounds like a problem with your choke. It may just need to be cleaned (linkages and all). If the choke doesn't close after reaching operating temperature, the engine will rev high. This indicates a choke stuck in the open position. Also, you may need to look for a vacuum leak if cleaning it doesn't fix it. On a 1981 GM product, I'd expect the vacuum hoses to be stiff and cracking.

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An exhaust manifold leak would not case it to run rough. Check vacuum lines that go to the in take manifold. If you have a line that is open it will get too much air at idle and cause a misfire intermittently. You also need to check plug wires. How long have the plugs been in the heads. Check the rotor and cap also.

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I am familiar with these, a manual choke carb works off of a bimetal coil in the manifold exhaust crossover on the passenger side of the intake, Make sure it is hooked up, then while the car is cold, on the rockchester carbs, use an 1/8 in drillbit to set choke. You have to loosen the three screws on the choke to set, when the choke flap, the very top one on the carb touches the drillbit, set it there and lock down screws, pump once or twice and it should start and idle, as the bimetal coil heats up it should open the top flap. if you try to accelerate before it is wam it will disconnect from the auto choke. I hope this helps if not please do not rate me at all, if it does help you fix your problem then please give me a fixya,

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1 Answer

I dont think my vac.secondaries are working and i think a vac.line is hooked up wrong its a quadrajet 4bbl on a stock 305 in an 84 el camino


On the R.H side of the carb behind the automatic choke down on the rear throttle shaft there is a pin running thru the shaft with a lever that will lock it out. If the choke is not fully open or the weight behind the auto choke is not dropping the lever will not relase the secondaries to open.

Aug 01, 2008 | 1984 Chevrolet El Camino

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