Engine RPM - SaabCentral Forums
*
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum


Go Back   SaabCentral Forums > Saab C900, 1979-1993 & '94 Convertible (C=classic) > C900 Workshop

C900 Workshop Classic 900 (1979-1993 & '94 Convertible) Technical Forum.

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 19th July 2006
hipbluescat hipbluescat is offline
Junior Member
 
Join Date: Nov 2005                                                
Location: sydney
My Saabs: 1990 900i 16v
Posts: 27
Default Engine RPM

Hello

I have a 900i SAAB 1990 model. I have noticed that when I do a lot of city driving that the RPM sometime stays at 1800 RPM even though I am stopped in the traffic.

Is this normal for the engine to do this ?

If it is normal then for what period of time should this do this for ?

If this is not normal then what is the problem with the engine ?

Regards
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 19th July 2006
Jezzadee's Avatar
Jezzadee Jezzadee is offline
Saab on the Brain!
 
Join Date: May 2003                                                
Location: Southwold UK
My Saabs: Yamaha FZ6 Fazer
Posts: 9,170
Default

Not normal.

A couple of seconds, if that.

Sticky AIC, probably. Try cleaning the AIC valve and throttle body with carb cleaner as described in the tech help section.
__________________
Go Dutch
Reply With Quote Quick reply to this message
  #3  
Old 19th July 2006
jetman jetman is online now
Saab on the Brain!
 
Join Date: Sep 2002                                                
Location: Guelph Canada
My Saabs: 1984 T8
Posts: 6,938
Default

If not AIC valve, check also vacuum hoses for big holes or disconnect.
Reply With Quote Quick reply to this message
  #4  
Old 20th July 2006
hipbluescat hipbluescat is offline
Junior Member
 
Join Date: Nov 2005                                                
Location: sydney
My Saabs: 1990 900i 16v
Posts: 27
Default

I have also noted that if I rev the engine that the RPM also drop.

Does this confirm the AIC valve diagnoses ?

I thought that the SAAb has fuel injection and that there is no carbuator ?

Regards
Reply With Quote Quick reply to this message
  #5  
Old 20th July 2006
SteveTheFolkie's Avatar
SteveTheFolkie SteveTheFolkie is offline
Saab Lunatic
 
Join Date: Jan 2006                                                
Location: Pennsylvania, USA
My Saabs: 1987 900 8V
Posts: 4,078
Default

sounds like your throttle linkage may be a bit dry and sticky - gradual release doesn't make it go to the stop but a sudden rev and dump does - a bit of lube on the pivot and even some wd40 down the cable might help -

There were Saabs with carbs - yours however would be injected - doesn't matter really - if the idle controller isn't working OR if the throttle is gummed up you're gonna idle high -
Reply With Quote Quick reply to this message
  #6  
Old 20th July 2006
jetman jetman is online now
Saab on the Brain!
 
Join Date: Sep 2002                                                
Location: Guelph Canada
My Saabs: 1984 T8
Posts: 6,938
Default

If you can blip it down there is a good chance its just the butterfly in the throttle body that's binding. Give it a good clean with some carb cleaner. Maybe even remove it and really go at it.
Reply With Quote Quick reply to this message
  #7  
Old 20th July 2006
Jaap_F Jaap_F is offline
Junior Member
 
Join Date: Jul 2006                                                
Location: Netherlands
My Saabs: 1989 900i sedan-2.0L 16v-non turbo aut
Posts: 10
Default

Quote:
Originally Posted by hipbluescat
I have also noted that if I rev the engine that the RPM also drop.

Does this confirm the AIC valve diagnoses ?

I thought that the SAAb has fuel injection and that there is no carbuator ?

Regards
I've had the same problem for about two years. Also bad at idling And my engine also dropped RPM a bit if I reved it a bit. Because of some problems, I checked the whole air intake system and I found a few minor vacuum leaks and a very dirty AIC. So I replaced some vacuum hoses and cleaned the AIC and since then it always idles perfectly.

And as said, carburator cleaner is the best stuff to clean the AIC with. This stuff is meant to clean parts of the air intake system with, so what better to use than this .
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 11:42 AM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.