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06-21-2008, 02:17 PM
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#1 | |
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AF Newbie
Join Date: Jun 2008
Location: Winston-Salem, North Carolina
Posts: 1
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‘96 Lumina 3.1 with a rough idle
I’m stumped. I have a ‘96 Lumina 3.1 with a rough idle problem. The car runs and idles fine in park and runs fine when moving, but once I stop with the brake pedal depressed the engine starts to run as if it’s missing. When the brake pedal is released the car goes back to normal almost immediately.
I think it’s a vacuum problem and I have checked all of the vacuum lines and replaced a few, but the problem has not gone away. Could it be the EVAP Vacuum Switch or the EVAP Canister PURGE Valve? Since the brakes are involved could it be a bad Vacuum Brake Booster? I also noticed that there is a vacuum line coming off the bottom of the EVAP Vacuum Switch (at a right angle) that is not connected to anything. I appreciate your help. |
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06-21-2008, 04:21 PM
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#2 | |
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A990 racer
 Join Date: Mar 2002
Location: Chestertown, New York
Posts: 17,050
Thanks: 26
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Re: ‘96 Lumina 3.1 with a rough idle
Take the vacuum hose off the booster, block it off and see how the engine runs.
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