ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > C4 ZR-1 > C4 ZR-1 Technical Postings

Reply
 
Thread Tools Display Modes
Old 04-25-2012   #1
GOFAST
 
Join Date: Dec 2011
Location: Minnesota
Posts: 31
Default IDLE / THROTTLE ISSUE

I have a '95 with 4800 miles. It runs great but I have an idle / throttle issue. At start-up the engine idles normally at 700 RPM. Once the engine is at operating temperature, it idles at 1100 RPM. However, I can bring the idle back to 700 RPM by agressively "tapping" the accelerator pedal. The engine idle returns to 1100 RPM after normal driving. Also, if the engine is shutdown and restarted, the idle always returns to normal (700 RPM). I have cleaned and lubed the throttle blades but have not removed and rebuilt the throttle body. I'm also wondering if the throttle linkage may be sticking and causing the issue.

Any ideas?
GOFAST is offline   Reply With Quote
Old 04-25-2012   #2
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
Default Re: IDLE / THROTTLE ISSUE

Quote:
Originally Posted by GOFAST View Post
I have a '95 with 4800 miles. It runs great but I have an idle / throttle issue. At start-up the engine idles normally at 700 RPM. Once the engine is at operating temperature, it idles at 1100 RPM. However, I can bring the idle back to 700 RPM by agressively "tapping" the accelerator pedal. The engine idle returns to 1100 RPM after normal driving. Also, if the engine is shutdown and restarted, the idle always returns to normal (700 RPM). I have cleaned and lubed the throttle blades but have not removed and rebuilt the throttle body. I'm also wondering if the throttle linkage may be sticking and causing the issue.

Any ideas?
The fact that it idles fine after shutdown says its a sticking throttle. I just went thru same issue although my throttle body was disassembled for media blasting and paint.
__________________
[SIGPIC][/SIGPIC]Former Membership Chairman
Former ZR-1 Registry - BOD
1972 Corvette 4speed base Coupe SOLD long time ago
1984 Corvette Z-51/4+3 SOLD
1992 Corvette ZR-1 Aqua/Gray #474 SOLD
1992 Corvette ZR-1 Black Rose/Cognac #458
2014 Honda VFR Interceptor DX
XfireZ51 is offline   Reply With Quote
Old 04-26-2012   #3
scottfab
 
scottfab's Avatar
 
Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
Default Re: IDLE / THROTTLE ISSUE

After it stick don't blip it.
Take the bellows off and reach in with a long screwdriver or stick
and push back on the big plates. If that does lowers it back then
your looking at linkage or the big plates sticking still.
If there's no change then look to the little plate in the middle below the
two big plates. It or the linkage to it could be it.
I have never seen any other source of problem to the symptom described.
__________________
Scott


Vett owner since 1979._It's about the car and the people
scottfab is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:45 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020