UKSaabs

THE site for UK Saab people!
It is currently Fri Jun 22, 2018 4:55 pm

All times are UTC



Forum rules


IMPORTANT INFORMATION FOR NEW TOPIC TITLES
For Workshop questions, please include year, model and a brief description of the issue in the thread title (in order to assist others to assist you),
This forum is not to be used to advertise items for sale or for items wanted, please use the classifieds for such posts.



Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: Wed Jan 31, 2018 12:58 pm 
Offline
Active user

Joined: Thu Dec 06, 2007 12:16 pm
Posts: 126
Location: Blackpool
Car Model: C900i Convertible
My 1989 900i 16V has been in garage storage for about 3 months. Before it was parked up it had recently been serviced including new fuel filter, plugs, oil+filter, air filter, HT leads, distributor cap and rotor arm. I also replaced most of the small engine bay hoses with silicone pipes as many were showing signs of splitting. It was running great.

I went to move it today and it started fine as usual. I left it idling while I checked the tyre pressures and cleaned the dirt of the screens. By the time I was ready to go it was at normal running temperature.

The fault is that when you try to rev the car it will missfire. If you release the throttle it will go back to a steady idle. If you hold the throttle the engine will die. It will restart easily and go back to a steady idle. You can increase the revs gently, but anything else starts the missfire. I didn't bother to try driving it like this as it's an auto and I didn't want to get stranded so I just left it in the garage.

Any ideas as to what the fault could be? I checked all the connectors and pipes, but there's nothing obvious. I was thinking it's fuel related as I had similar symptoms on an old Ford with a blocked fuel jet that was carb though and this is Bosch fuel injection.


Top
 Profile  
 
PostPosted: Thu Feb 01, 2018 10:18 am 
Offline
Full Pressure Turbo
User avatar

Joined: Wed Jun 21, 2006 3:14 pm
Posts: 616
Location: Chorley, Lancs, UK
Fuel pump on its way out would cause those symptoms. Did you out fresh fuel in it? I know fuel goes off after a while, but not sure how long it takes.


Top
 Profile  
 
PostPosted: Thu Feb 01, 2018 1:56 pm 
Offline
UKSaabs Trader
User avatar

Joined: Wed May 12, 2004 9:53 pm
Posts: 15941
Location: Devon
Mr Burrrrt wrote:
I know fuel goes off after a while, but not sure how long it takes.

People do say that and I'm sure it is true but my 90 started and ran fine after sitting out in the elements for 8 years with the same fuel in the tank and no fresh fuel added to start it up. We have cars here that only get started every 6 months, if that, and never have to fiddle with putting new fuel in them unless they are empty.

_________________
www.SAABits.com - helping to keep Saabs on the road
10% Discount for UKS members: enter code UKS2017


Top
 Profile  
 
PostPosted: Thu Feb 01, 2018 5:57 pm 
Offline
UKS Addict
User avatar

Joined: Tue Dec 15, 2009 11:23 pm
Posts: 2293
Location: Ipswich, Suffolk
Car Model: 900T16s, Daihatsu Charade GTti
Checked on the fuel front for mine and curiosity a while ago and apparently here in the UK we have one of the best quality petrol around and looking on the Shell website if I remember there's no difference for at least 6 months, even a year doesn't really create problems, end of the day much of it is to do with storage I guess, hope so, my Charade is broke and haven't got the cash to fix it at the moment and the petrol in it is 6 months old now but the tank is over 2/3rds full.
If it was going to be over a year in there then I would consider hot wiring the fuel pump and then running it into another car which is on the road, leave a little in the tank of course and then get a couple of Jerry cans worth in there


Top
 Profile  
 
PostPosted: Thu Feb 15, 2018 2:39 pm 
Offline
Full Pressure Turbo

Joined: Fri Jul 24, 2009 11:57 am
Posts: 616
Location: Norfolk nr21
Car Model: c900 verts and tin top
Crank position sensor failing. 2hr job sometimes they act up like this or will run and misfire occasionally another time they die..end of, which ever CPS needs renewing. Been there


Top
 Profile  
 
PostPosted: Thu Feb 15, 2018 6:10 pm 
Offline
UKSaabs Trader
User avatar

Joined: Wed May 12, 2004 9:53 pm
Posts: 15941
Location: Devon
16saabs wrote:
Crank position sensor failing.

Could be. If it turns out to be the case, we stock it here:
http://www.saabits.com/electrical/saab- ... h=165_166&

_________________
www.SAABits.com - helping to keep Saabs on the road
10% Discount for UKS members: enter code UKS2017


Top
 Profile  
 
PostPosted: Sun Feb 18, 2018 3:37 pm 
Offline
Saab Nut

Joined: Thu Nov 11, 2010 12:26 pm
Posts: 1573
What injection unit does it have? Only asking as the bosch mechanical metering units gum up. The test was firing each injector into a large container by hot wiring the injector relay.


Top
 Profile  
 
PostPosted: Sun Feb 18, 2018 3:40 pm 
Offline
Saab Nut

Joined: Thu Nov 11, 2010 12:26 pm
Posts: 1573
The rubber can fail under the fuel pump in the tank, but I would suspect it wouldn't run at all andyou can hear the pump priming up normally on the first turn of the ignition.


Top
 Profile  
 
PostPosted: Mon Feb 19, 2018 5:40 pm 
Offline
UKSaabs Trader
User avatar

Joined: Wed May 12, 2004 9:53 pm
Posts: 15941
Location: Devon
rallyv4 wrote:
What injection unit does it have?

He says it's 16V so I assumed LH.

_________________
www.SAABits.com - helping to keep Saabs on the road
10% Discount for UKS members: enter code UKS2017


Top
 Profile  
 
PostPosted: Tue Feb 20, 2018 5:37 pm 
Offline
UKS Addict
User avatar

Joined: Wed Nov 22, 2006 10:32 pm
Posts: 5747
Location: Glenrothes, Fife
Car Model: 95, 99, 900, 9000, 93, Sonett
If it's the 900i with the EZK, there are a few possibilities.

1. Poor fuel.
2. Fuel pressure regulator failing.
3. Fuel pump failing.
4. Failing CPS.
5. Failing EZK control ECU.

Our MY89 c900i has a failing EZK, which results in very retarded ignition & poor running when hot.

_________________
MY70 95 V4 Van
MY73 95 V4
MY73 Sonett 3
MY83 99GL
MY89 900i S
MY96 9000 Aero
MY02 93 2.2 TiD x2


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group

follow UKSaabs on Twitter



UKSaabs silhouette logo images by Mark Green www.greenphotos.com
"subsilver2" slightly bodged by UKSaabs for our own use.

:: Disclaimer ::
Comments posted here are the views of their individual authors and are not necessarily shared by the owners of this Web site.
Authors assume all responsibility for comments posted here.

UKSaabs The biggest and best privately owned UK based independent Saab forum for all SAAB enthusiasts.
Whilst we encourage our users to support our advertisers the site wishes to remain independent and therefore does not endorse any particular advertiser(s)
UKSaabs is not affiliated with Saab Cars UK or Saab Automobile AB