09-18-2010 | #1 |
Join Date: Feb 2005
Location: Springfield, PA
Posts: 372
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IDLE
FYI, I've had an idle issue since I bought my ZR1.
Sometimes when I come to a stop it wants to idle at about 1200. Usually I can "kick" it down to about 700 - 800. When the AC is on its hardly a problem. Read on this forum that the K&N air filter maybe to blame which it what I had. I put an OEM air filter in a few weeks ago and the problem has gone about 70% away. FWIW
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John Porter '93 Ruby Coupe ZF6 - Muffler eliminators, Blink Blink kit and Polished ZR1 Wheels * PA Plate: OBSSSN '06 LeMans Blue C6 Coupe - Corsa exhaust * PA Plate: OBSSSV ZR1 Net Registry Founding Member #153 40th Anniversary Registry Member NCM Family Membership #8116 Corvette Forum NE Events Coordinator Delco Cruisers Board of Directors SAVE THE WAVE! |
09-20-2010 | #2 |
Join Date: Feb 2008
Location: Vancouver, BC
Posts: 252
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Re: IDLE
I had similar issues. Taking the filter right out didin;t resolve my high idle issues.
I finally had a custom PROM burned for me - idle behaviour is now 100% improved.
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[SIGPIC][/SIGPIC] __________________ 1990 Corvette ZR-1 #2824 4.10's, Custom PROM, Flowmaster, Top End Port NCRS BC Chapter |
09-20-2010 | #3 |
Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
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Re: IDLE
John,
I see that you have a Haibeck chip installed. I recommend that you give Marc a call or email him (mailto:mhaibeck@sbcglobal.net) with the symptoms and see if he can make some recommendations. Good luck, Jim
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If it isn't fun, you aren't doing it right! 1990 Black ZR-1 - sold 1993 Quasar Blue ZR-1 1994 Competition Yellow ZR-1 1995 Dark Purple ZR-1 Maryland State Coordinator WAZOO Member |
09-20-2010 | #4 |
Join Date: Jul 2004
Location: Sudbury, Ontario. Canada
Posts: 1,538
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Re: IDLE
I used to have this problem occasionally with the standard chip, but Marc's chip eliminated it altogether. I also have the K&N filter.
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1991 #1516 Black/Black davidmkelly.com "Speed is often confused with insight." - Johan Cruijff |
09-20-2010 | #5 |
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
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Re: IDLE
Do you have access to a scan tool?
I believe the '90 calibration problem (though someone correct me if I am mistaken) is that it doesn't command a lower idle when you stop. So in a scan tool, you should be able to see the desired idle and the idle air counts. Presumably (my car came with the updated cal already) you would see a commanded idle of 1200 or so, and many idle air counts. If you see a commanded idle of 650 or so, and zero idle air counts, either your throttle body is sticking, your IAC has some problem/needs to relearn, or you have some other air leak. When you say you can "kick" it down, what do you mean? Blipping the throttle? Some other thing? The A/C on puts a big load on the motor, to where the air the engine needs may surpass any air leak, so this may be why you don't have the problem then. I want to say kicking the A/C on adds like 10-20 steps to the IAC, which is kind of a lot. Edit: nevermind on the cal thing, you have '94. That was a '90 only issue I believe. Presumably it would just be an occasional air leak from a sticking TB, a bad/unlearned IAC, or some air leak elsewhere.
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Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img] |
09-23-2010 | #6 |
Join Date: Nov 2006
Location: DeBary , Fl.
Posts: 119
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Re: IDLE
Look over your entire PCV system & replace valves if dirty? Cracked hoses or sloppy connections? Wire tie @ valves if loose & seal all w/hair spray. The system can give goofy symtoms.
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Gene in Fl. :handshak: ______________ 95 ZR-1 #399 Dunn heads X-pipe w/3" misc. mods |
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