Idle (P or N) high RPMs - Camaro Zone - Camaro Forums and News

Go Back   Camaro Zone - Camaro Forums and News > Camaro & Firebird Tech Forums > 3rd Gen (1982-92) Camaro and Firebird Tech

Join Camaro Zone Today
Reply
 
LinkBack Thread Tools
 
Old 06-23-2013, 08:34 AM   #1
New Member
Feedback Score: 0 reviews
 
OnefITA's Avatar
 
Join Date: Jun 2013
Posts: 21
Thanks: 2
Thanked 0 Times in 0 Posts
Garage
Idle (P or N) high RPMs

Hi guys,
here we are with my first question.

when I start my '90 RS in "P" the RPM goes stright up to 3.5 / 4 k
but when I put in D the rpms goes down to 2k (more or less)

is that thing normal? (consider that we have now 30C air temp)

maybe is some sensor to be cleaned? air box/MAF/IAC?

I suppose she should run idle 2.5k and less than 2k when in gear...

please give me some numbers/ ideas

thx!
Onef
__________________

__________________
OnefITA is offline   Reply With Quote
Old 06-23-2013, 09:34 AM   #2
Member
Feedback Score: 1 reviews
 
GPskinzhut's Avatar
 
Join Date: Apr 2012
Posts: 363
Thanks: 0
Thanked 17 Times in 16 Posts
Garage
Check for vacuum leaks. It should idle 750-900 RPM.
__________________

__________________

CZ CotM - August 2012
GPskinzhut is offline   Reply With Quote
Old 06-23-2013, 09:38 AM   #3
New Member
Feedback Score: 0 reviews
 
OnefITA's Avatar
 
Join Date: Jun 2013
Posts: 21
Thanks: 2
Thanked 0 Times in 0 Posts
Garage
oh great I'm just 1.5k over -.-'...
vacuum leak.. over air intake/IAC system? or where exactly?
thanks again!
__________________
OnefITA is offline   Reply With Quote
Old 06-23-2013, 10:14 AM   #4
Member
Feedback Score: 1 reviews
 
GPskinzhut's Avatar
 
Join Date: Apr 2012
Posts: 363
Thanks: 0
Thanked 17 Times in 16 Posts
Garage
Anywhere really... look for hissing noise, check all the rubber vac lines for cracks or loose fit, etc. There's some methods using carb cleaner, or preferably propane.

How To Find A Vacuum Leak - EricTheCarGuy - YouTube

This one cracked me up

Finding Engine Vacuum Leaks With A Cigar - YouTube
__________________

CZ CotM - August 2012
GPskinzhut is offline   Reply With Quote
Old 06-23-2013, 10:34 AM   #5
New Member
Feedback Score: 0 reviews
 
OnefITA's Avatar
 
Join Date: Jun 2013
Posts: 21
Thanks: 2
Thanked 0 Times in 0 Posts
Garage
Quote:
Originally Posted by GPskinzhut View Post
I'll use that one!!! when I found the leak (if any) I've anyway the cigar to smoke!!!
__________________
OnefITA is offline   Reply With Quote
Old 06-24-2013, 01:06 AM   #6
Veteran Member
Feedback Score: 0 reviews
 
kthxbai's Avatar
 
Join Date: May 2009
Location: Washington, D.C.
Posts: 1,199
Thanks: 14
Thanked 33 Times in 28 Posts
Garage
You definitely have a high idle issue, but it is normal to see a slight decrease in RPM when moving from P to D.

Steven
__________________
kthxbai is offline   Reply With Quote
Old 06-30-2013, 07:23 PM   #7
New Member
Feedback Score: 0 reviews
 
OnefITA's Avatar
 
Join Date: Jun 2013
Posts: 21
Thanks: 2
Thanked 0 Times in 0 Posts
Garage
ok there where some missconnection on the vacuum line, I've found and hopefully fixed the following:
from the back of injection body the hose goes out with a T connection facing the engine bay the top one goes to vacuum reservoir, the right to the brake system, the left goes into a sensor (atmospherical pressure?!)

then over the thottle body there is a "3pin" plastic connector but only 2 holes, a small hose goes down into injection the big one goes to fuel vapor canister...

now the min is just above 1k... but sometimes drops down, and rare times the engine dies...
IAC failure? or what?
__________________
OnefITA is offline   Reply With Quote
Old 07-01-2013, 09:44 AM   #8
Member
Feedback Score: 1 reviews
 
GPskinzhut's Avatar
 
Join Date: Apr 2012
Posts: 363
Thanks: 0
Thanked 17 Times in 16 Posts
Garage
You could try pulling the throttle body, removing the IAC housing and cleaning it all out (usually get carbon build up in the IAC, housing and behind the TB.

You'll need to reset it all properly afterwards. Be sure you have a new gasket set on-hand as the IAC housing to TB gasket and TB to plenum gaskets will likely go to shit after you pull it off.

IAC and TPS Adjustment - ThirdGen.org
__________________

CZ CotM - August 2012
GPskinzhut is offline   Reply With Quote
The Following User Says Thank You to GPskinzhut For This Useful Post:
Old 07-01-2013, 09:59 AM   #9
New Member
Feedback Score: 0 reviews
 
OnefITA's Avatar
 
Join Date: Jun 2013
Posts: 21
Thanks: 2
Thanked 0 Times in 0 Posts
Garage
I'll try first only to clean the IAC valve and housing...
(maybe she need only a little run after vacuum "rebuild")

by the way I'll bring to the doctor this week, better a full check-up...
__________________
OnefITA is offline   Reply With Quote
Old 07-02-2013, 06:19 AM   #10
New Member
Feedback Score: 0 reviews
 
OnefITA's Avatar
 
Join Date: Jun 2013
Posts: 21
Thanks: 2
Thanked 0 Times in 0 Posts
Garage
yesterday evening after work time, and after a long phone call with "the doctor", I've bought an additive for cleaning the injectors (5euro only) then I went for a small trip (just 50miles) seems MUCH better!!!

after a while (and after full throttle in highway :P ) smooth run, no low issue (or high RPM issue), vacuum line are OK, no low power..

seems I can say "solved" to this matter...
(anyway I'll bring to the mechanic... just to be sure :P )
__________________
OnefITA is offline   Reply With Quote
Old 07-04-2013, 08:39 PM   #11
Member
Feedback Score: 1 reviews
 
GPskinzhut's Avatar
 
Join Date: Apr 2012
Posts: 363
Thanks: 0
Thanked 17 Times in 16 Posts
Garage
awesome
__________________

CZ CotM - August 2012
GPskinzhut is offline   Reply With Quote
Old 07-05-2013, 03:00 AM   #12
New Member
Feedback Score: 0 reviews
 
OnefITA's Avatar
 
Join Date: Jun 2013
Posts: 21
Thanks: 2
Thanked 0 Times in 0 Posts
Garage
LOL I've said "victory" before win....
yesterday no way to keep at minimum.. final decision, bring it to the doctor...

1week without car.. but after she will be fine.. I hope
__________________

__________________
OnefITA is offline   Reply With Quote
Reply

Thread Tools

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
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Weird sound under high rpms 95greenz28 4th Gen (1993-97) Camaro and Firebird Tech 8 05-11-2013 02:58 PM
96 Trans Am poping at high rpms white_smokey 4th Gen (1993-97) Camaro and Firebird Tech 1 03-17-2013 02:51 PM
Check engine at high speed/rpms 95z28mickey 4th Gen (1993-97) Camaro and Firebird Tech 7 01-24-2013 03:40 PM
Was this extremely bad for my car? (first burnout & high rpms) 1994 Bird General Camaro & Firebird Tech 5 10-05-2012 10:17 PM
high idle 1985 Z28 3rd Gen (1982-92) Camaro and Firebird Tech 5 02-16-2012 02:00 AM




Powered by vBadvanced CMPS v3.2.3

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

RV & Travel Trailer Communities

Our RV & Travel Trailer sites encompasses virtually all types of Recreational Vehicles, from brand-specific to general RV communities.

» More about our RV Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 06:10 PM.
Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
Copyright © CamaroZone.com

Camaro News Delivered to your Email!

Get the latest Camaro news straight to your inbox!

unsusbcribe at anytime with one click

Close [X]