Won't rev from idle to 2200rpm - 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 20th September 2003
Dr Rock Dr Rock is offline
Saab Crazy
 
Join Date: Nov 2001                                                
Location: Hinckley
My Saabs: '91LPT 5dr, '89 16v 2dr
Posts: 993
Default Won't rev from idle to 2200rpm

'85 16s: starts fine and runs fine, turbo great, all for the first 15 minutes. After about 15 minutes if you come to a stop at a junction say, the car idles fine, but as soon as you put your foot on the accelerator it won't rev. Take foot off accelerator and put it down again and it will rev, but it won't hold a load unless you keep the revs above 2200 and slip the clutch.

AMM resistance is 380 ohms and can be changed, car has '86 ECU in kickpanel (missing when rescued from breakers), good spark at all plugs, plugs are NGK and new, vacuum hoses have been checked and replaced, coil is good. NTC is fine as well and no check engine light comes on. No O2 sensor or catalytic convertor on car.

Anyone got any ideas as to what is going on, 'cos I am running out of ideas?

Cheers,

Fraser
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 21st September 2003
LM LM is offline
Saab Crazy
 
Join Date: Dec 2002                                                
Location: USA
Posts: 813
Default

a few questions

this prob is fairly recent? i.e., the car ran w/o probs for some time after 86 ECU install (86 ECU is a compatible non-O2 sensor unit)?

you stated earlier no AIC, but AAV like CIS?? and it cks out okay? do you also have the pictured CSI/CSV (if so, test it for leaking)?

did you adjust your TPS?

what does your timing do, when going from hot idle to 2200RPM (does it advance properly)?

do you have strong acceleration in mid to upper RPM? fuel pres is good?

have you readjusted or do you have another AMM you can swap in (is it an 005)?

Bentley and Haynes will have more ideas!
Reply With Quote Quick reply to this message
  #3  
Old 21st September 2003
Alex's Avatar
Alex Alex is offline
Saab Lunatic
 
Join Date: Aug 2001                                                
Location: Crossing the England/Wales border
My Saabs: 3dr c900 T16RA, 9-5 Aero Estate
Posts: 4,666
Default

Could it be the throttle switch either not working or being incorrectly adjusted? Car sounds like it is running on the idle map, but then isn't coming off it when the throttle is opened.
Reply With Quote Quick reply to this message
  #4  
Old 21st September 2003
Dr Rock Dr Rock is offline
Saab Crazy
 
Join Date: Nov 2001                                                
Location: Hinckley
My Saabs: '91LPT 5dr, '89 16v 2dr
Posts: 993
Default

That is what I was thinking Alex. How do I test for this map thingummy?

The car runs fine, apart from this problem. Acceleration is fine. AAV is fine. TPS has been replaced and checked and is fine. Car ran OK with '86 ECU in, but then it started quite quickly to have this problem, not every time one drove it though. Now it is everytime.

Swapping 005 AMM doesn't make any difference. Don't have another ECU to swap Don't know what the timing does, but given the car is fine for the first 15 minutes I can't see how it can be the timing. It seems to me the problem occurs once the car has warmed up, ie the engine comes off the warm up cycle. I keep thinking it is not getting enough fuel....if one very very gently accelerates the car can cope. Press harder on the accelerator and it bogs down.
Reply With Quote Quick reply to this message
  #5  
Old 21st September 2003
Alex's Avatar
Alex Alex is offline
Saab Lunatic
 
Join Date: Aug 2001                                                
Location: Crossing the England/Wales border
My Saabs: 3dr c900 T16RA, 9-5 Aero Estate
Posts: 4,666
Default

Not sure how to check the map unfortunately. Have you checked if the TPS signal is making it to the ECU?

Also, has the fuel pressure been checked?
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:
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 10:14 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.