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05-18-2017
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#1 |
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Join Date: Oct 2016
Location: Atlanta GA
Posts: 51
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Idle Issue - Yes Another
After opening her up a bit and as I come to a stop, idle wants to stay at 2000rpm or so. I tap on the gas pedal, she comes down to 750 rpm. Anything in particular I should look for? Thanks in advance...
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05-18-2017
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#2 |
 
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,914
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Re: Idle Issue - Yes Another
This is directly from Marc Haibeck's website.... zr1specialist.com
"High idle speed is most commonly caused by a vacuum leak. The throttle body can cause a high idle if a throttle plate binds with a bore.*If the high idle is intermittent or goes away when the accelerator pedal is kicked, the high idle is caused by the throttle body. If a light tap fixes the idle, the problem is with the primary throttle. If a hard kick to 25% throttle or more helps, the problem is with the secondary throttles." Hope this helps....
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Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1974 L-82 355 Vert. 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
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05-19-2017
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#3 |
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Join Date: Jan 2017
Location: US
Posts: 233
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Re: Idle Issue - Yes Another
So a vacuum leak would cause a constant high idle?
Sent from my XT1585 using ZR-1 Net Registry mobile app |
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05-19-2017
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#4 | |
Join Date: Dec 2007
Location: NYC
Posts: 1,189
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Re: Idle Issue - Yes Another
Quote:
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90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD" |
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05-19-2017
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#5 |
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Join Date: Oct 2016
Location: Atlanta GA
Posts: 51
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Re: Idle Issue - Yes Another
I am the original poster about the idol issue. The fact that as I coast down to a stoplight it sticks out about 1600 RPM, I tap on the pedal and it goes back down to 650 RPM, I may have a problem with the primary secondary cable?
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05-19-2017
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#6 |
 Join Date: Aug 2014
Location: Kansas City, MO
Posts: 838
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Re: Idle Issue - Yes Another
How many miles? I bet your throttle body needs a service.
__________________
Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
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05-23-2017
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#7 |
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Join Date: Aug 2005
Location: Iuka, Mississippi 38852
Posts: 756
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Re: Idle Issue - Yes Another
You may be experiencing a normal situation. My car doesn`t return to normal idle speed until its fully stopped.
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05-24-2017
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#8 |
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Join Date: Oct 2016
Location: Atlanta GA
Posts: 51
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Re: Idle Issue - Yes Another
Thanks to all who have responded. By the way, what things need to be done to service the throttle-body
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05-24-2017
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#9 |
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Join Date: Jan 2017
Location: US
Posts: 233
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Re: Idle Issue - Yes Another
My '90 does the same thing sometimes, after about 10 miles or so when it's heated up it comes back to normal idle.
Sent from my XT1585 using ZR-1 Net Registry mobile app |
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