Question about 1991 Chevrolet Camaro

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Very rough Idle on a 1991 Chevrolet RS Camaro 3.1 V6

The idle isn't to bad when you are stopped at a red light but it is horrible when you sit for 5 minutes in a drive threw or something and it is VERY bad when you you put it in park and let it idle, the car has about 167,000 miles, the catalytic converter was cut off before i got it and the O2 sensor isn't even there, however I didn't have the money to replace the EGR valve when it went out so I just plugged it off with a piece of steel. Any help would be greatly appreciated though.

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Pull out a spark plug if the plug is dark colored (blackish colored it is a rich mixture problem or week ignition may be a cap and rotor could help I've seen plug wires do that give it a cheap tune up

Posted on Jul 01, 2009

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Posted on Jan 02, 2017

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1 Answer

Lower idle 305 tbi 1991 camaro


I own a 1991 rs it had a ideal problem so I changed the following only to learn this...! I changed the o2 the map the air temp sensors and new bosh plugs wires dist. And button init. Mod and pick up coil all helped some but it still weren't right then I learn about the erg vaulve oh I changed vac lines as well I now know the egr controls gas flow and can go bad or stick their bout ninety bucks

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I have a 1991 Camaro RS, when i start the car, the needle reads about 5,000, i shut the car off and put the needle at 0 then i started it back up and it was fine but when i push the gas, it immediately...


Either your idle air control is bad/gummed up or your throttle position sensor is bad-you should also make sure there is not some issue with your accelerator cable binding, starting up at 5 grand could be fatal-any check engine light? has there been someone under the hood recently, who didn't connect up vacuum hoses?

Mar 09, 2011 | 1991 Chevrolet Camaro

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91 Camaro RS with 3.1 engine. Last couple of days it has been racing when started, tach runs to 4000 RPM. Shut the engine of and restart a couple of times and it is ok. Today is started same thing except...


Code 12 is normal when engine is not running and adl is to ground ... I would have a look around for broken or disconnected vacuum lines ... Another possible is a stuck idle air control motor.

Jul 28, 2010 | 1991 Chevrolet Camaro

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tune up-read your plugs and then check your timing. use timing light and double check with scan tool-most 91 305's were high outputs which
requires higher octane than regular (fuel grade revelatnt to compression ratio and altitude) you may want to check fuel pressure could be a clogged filter or bad pump.

Apr 15, 2010 | 1991 Chevrolet Camaro

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I have a 1992 camaro at idle its ok . In gear low rpm rough runin


I worked on one of these the other day and what fixed the same problem it sounds like is I changed out the distributor cap and rotor. the rotor can be a pain to get off. and also don't cross any plug wires take one off at a time and put it on the new one.

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Check for vacuum leak at the base of the throttle body. Also check all vacuum line and for loose connection points

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Adjust idle speed back down
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Mar 30, 2009 | 1991 Chevrolet Camaro

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97 rs camaro, vibrations when idling, followed by not running


i recommend checking out your plugs and wires. If you take out any of the spark plugs look at their condition and compare them to each other if there is one darker or wetter than the others that is the one that is misfiring causing the vibration and difficulty in starting.

Nov 28, 2008 | 1997 Chevrolet Camaro

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