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01 Supercharged Motor Low and Choppy Idle

9

97Luminaltz

New member
Hello This Is My Second Post Here.... I Own A 97 Lumina LTZ With A Series II Supercharged Swap... Its Got Headers and ZZP Tune Stage One, Flowmaster 40 Series Duels, and 3.5 Pulley Recently I Had To Change The Crank Sensor And Most Of The Others Just To Get It To ACTUALLY Run... Now It Runs Half Way Decent But Has A Low And Choppy Idle (Sounds Like Its Loading Up) Once You Touch The Gas Anything Over 2000RPM It Cleans Out And Has All Its Power, Driving It Is A Pain Cause I Gotta Be In The Throttle To Keep It Smooth Just Barely Touching It, It Stumbles and Wont Go......... I Am To The End Of My Rope! I Changed MAP, Mass Air, Throttle Position, Air Idle Valve, Crank Sensor, and The Mod Under The Coils and Have The Same Issues.......... Any Idea's Guys??
 


sounds like a vacuum leak. spray some carb cleaner around the engine at the vac lins and T's and ends. check the egr tube too for leaks.
 
Do you have a scanner that can watch real time data?

If yes..turn the ignition to on, not start.. just on. Watch the O2, it should take a minute and then sit at about 450mV. If it does not, unplug the upstream o2 and see how it runs. Do not get on it while you have it unplugged. It's good for testing though.
 
well thats the thing it wont run proper without your foot in it... or at least 1800-2000RPM when its idling it just sounds like a HUGE CAM real loopy when your slowly doin the throttle it chugs and kinda seems like its over fueled then once in higher RPM it is fine
 
sounds like my car did when the evap vac line, top of the TB broke. it idled like i had a huge cam in it. wanted to stall in gear. ran just fine down the road.
 
Was having a similar problem with my grand prix gtp it turned out to be my coil went bad because the plate that holds it down had been stripped was shorting things out or something got a new one at a junk yard 5 bucks fixed the problem make sure your wires are good too, also like Scottydoggs is saying look for air leaks as well
 


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