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06-25-2005
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#1 |
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Join Date: Jun 2005
Location: NILES, MICHIGAN
Posts: 3
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ROUGH IDLE, SLUGISH PERFORMANCE
started getting rough idle lately, worse with a/c on. not the map sensor, checked that. runs smoother at high rpm but still not right. also have nocking noise at idle but have been told that is the dual-mass fly wheel making the noise caused by the rough idle. anybody have any ideas???-------------thanks for any help-------------Greg
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06-25-2005
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#2 |
 
Join Date: Dec 2003
Location: McHenry, Il.
Posts: 6,607
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DM FLYWHEEL
DM FLYWHEELS DO GO OUT AS EARLY AS 80K MILES I HAVE HEARD!!!! PART OF THE REASON I PUT AN ALUM. ONE IN AND NOW GET TO LISTEN TO THE TRANNY GEAR RATTLE...BUT MY STOCK DM NOW SITS ON THE SHELF WITH 60 K ON IT ONLY!!!
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http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln |
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06-26-2005
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#3 | |
Join Date: Dec 2003
Location: S. Florida
Posts: 2,667
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Re: ROUGH IDLE, SLUGISH PERFORMANCE
Quote:
 We need a few details like year, miles, what has been done in the way of mods, maintenance, etc., to better help you figure it out. 
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06-26-2005
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#4 | |
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Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Re: ROUGH IDLE, SLUGISH PERFORMANCE
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Check all ignition system components. Run the fuel pressure tests in the service manual looking for leakinjg or fouled injectors. Make sure the throttle body is clean. The throttle plates are clean and the throttle shaft bores are not so worn that the TB is leaking. Verify that the oxygen sensors are in good conditions. Make sure the engine controls' grounds at the back of the block are clean and tight. Lastly, the factory Service Manual may offer additional information on solving a rough or unstable idle problem. As for the dual mass, if it's making noise, particularly, if, when you turn the key off, you hear a "rattle-rattle" just as the engine comes to a stop, the assembly needs to be replaced. Good luck.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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06-26-2005
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#5 | |
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Join Date: Feb 2004
Location: Ma
Posts: 404
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Since you will most likely have to remove the plenum, this site should help if you haven't done it before. http://www.bcvettes.org/?http://www.bcvettes.org/howto/
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06-28-2005
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#6 |
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Join Date: Jun 2005
Location: NILES, MICHIGAN
Posts: 3
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CAR is 1990, and has 12,500 miles. heard also that a shorted fuel injector solenoid a cause for rough idle. has anyone ever heard of Haibeck Auto Technology in Addison ill. ??? they are suppose to be Zr1 pros---any comments ??? taking car to local dealer thursday for check-up, they said they have a zr-1 certified mechanic.---thanks ---Greg
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06-28-2005
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#7 | |
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
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Re: ROUGH IDLE, SLUGISH PERFORMANCE
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Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img] |
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07-03-2005
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#8 |
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Join Date: Jun 2005
Location: NILES, MICHIGAN
Posts: 3
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new injector on number 2 cylinder, all better now thanks guys
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07-03-2005
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#9 | |
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Join Date: Dec 2003
Location: S. Florida
Posts: 2,667
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Quote:
When you get the chance, may I suggest you put your city, or at least your state in your profile. 
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