SaabCentral Forums banner

1 - 20 of 25 Posts

·
Registered
Joined
·
175 Posts
Discussion Starter #1
Hello,
I had to call out the breakdown service today, old trusty 9-5 died and wouldn't fire. Any pointers would be very much appreciated.

Some background: MY02 9-5t at 114,000miles. Generally running well, no Check Engine light and serviced regularly by myself, although oil a couple of months overdue. Past Check Engine lights caused me to use the OpCom tool and read B1312 and B1334 errors although they are intermittent. Just the past couple of days its been idling ok around 900rpm then will sometimes gradually slow over a second or two to perhaps 500rrpm then suddenly accelerate very briefly and comfortably idle again. Drives generally fine although coinciding with the idling problem its twice started to loose power and then lurch, as if a fuel supply problem.

Its been cold recently, but not icy, is running on economy unleaded from a supermarket, and finally has developed a "whirring" noise during cold morning startup, sounding like a belt, but settles after some seconds.

Breakdown guy arrived and after it had been sitting for around 45mins it started first time! He suggests fuel pump relay which makes some sense and I'll try changing but I'm also tempted to change ignition pack. I think the whirring sound is misleading.

Any thoughts, please!
 

·
Registered
Joined
·
7,397 Posts
Most likely the crankshaft position sensor. General condition is that the car won't start when warm but will start when cool, although that is not always the case. When you're cranking check the tach. If it doesn't move at all the CPS is probably bad.

Not horribly difficult to replace, it's on the front of the engine just behind the downpipes from the turbo. One thing to note, there is an O-ring that seals oil from coming out and when you replace the CPS the O-ring sometimes doesn't come out. The new one comes with a new O-ring and if you have two of them in there it won't be close enough to the sensor ring to work.
 

·
Registered
Joined
·
3,587 Posts
The "whirring" sound when cold could be an indication of sludge present in the oil sump.

Has your PCV system been updated?
.
 

·
Registered
Joined
·
175 Posts
Discussion Starter #4
It isnt something I've done myself, is there any simple signs to look for to identify if it has been updated?
 

·
Registered
Joined
·
175 Posts
Discussion Starter #5
Ive ordered a CPS for delivery tuesday, eill leave the car parked up until then.

Im now worrying about sump sludge!
 

·
Registered
Joined
·
3,587 Posts
How long have owned the car?

Do you know it's service history?

If the car was run with full synthetic oil, had the PCV update and had more reasonably scheduled oil changes then those originally recommended by Saab then you might be okay.

The only way to know for sure is to drop the sump (not a terrible job) and see what you have.

As far as "simple sign" to know if the PCV system has been updated I'm not sure, there are a number of variations over the years, you'd be best off spending some time researching this to compare what you currently have in your car.
.
 

·
Registered
Joined
·
175 Posts
Discussion Starter #7
Ill do some reading, thanks!

Ive had it 3 years now, does about 6000 a year and i always change with fully synthetic oil about. Dont have any history for it but its always run well. Its a great car: dont want to kill the engine!
 

·
Registered
Joined
·
3,587 Posts
Start here:

 

·
Registered
Joined
·
7,828 Posts
B1312 or P1312? If both those are P (powertrain) codes, sounds like you DIC is failing.

Other candidates for why an engine might stop would be the CPS, or the fuel pump.

Sludge may or may not be an issue, but that's not what is causing your 'engine won't run' problem right now.
 

·
Registered
Joined
·
175 Posts
Discussion Starter #11
Hello again. Thanks for all the comments, very much appreciated.
I got a CPS and changed it today but still wont start. Turns over but no tachometer movement. I guess faulty sensor but seems unlikely. I took out the old sensor and o-ring and fitted new o-ring to new sensor first, was that right?
I was pretty pleased with myself as I managed to do it from the top! But still no start.
No CEL, and only the P1312/P1334 codes that havent cleared. I guess could be ignition cassette but the tachometer should still move when cranking?
Breakdown man had suggested fuel pump relay (can hear the fuel pump priming). Im stuck!!!
 

·
Registered
Joined
·
3,587 Posts
Rather than guessing and throwing parts at the car a TECH2 scan will 99% of the time point you directly to the issue.
.
 

·
Registered
Joined
·
175 Posts
Discussion Starter #13
Thanks for the advice. My problem is getting a imobile car to a saab specialist. The AA guy did some diagnostics and didnt find any new codes.

Gule is getting to the rail. Ignition cassette appears to be sparking but no tachometer movement.

Hoing to remove the new sensor and replace with the old dubious one and see what happens.

A tad upset! I was so chuffed I'd managed to change the sensor from the top too!
 

·
Registered
Joined
·
7,828 Posts
Do you have WIS? You can get a full troubleshooting procedure to investigate your codes. They point to an issue with either the DIC or its wiring. At a start, try disconnecting the wiring and see if there's anything suspicious. If you can find a known good DIC, install it.

Even a google search on "Saab P1312 P1334" has lots of results. None seem to point to CPS or other speculations here.

....Ed
 

·
Registered
Joined
·
2,080 Posts
As Ed mentioned, P1312 and P1334 are good signs of a failing or failed DIC. I had those codes when my DIC was starting to go. I'd replace your DIC (Genuine SEM or NGK only) and plugs. Be sure you're running the exact NGK plugs specified in your owner's manual, as the DIC uses them for knock detection.
 

·
Registered
Joined
·
175 Posts
Discussion Starter #18
So it appears to be a faulty new CPS! Checked it this morning with new one it, turns over but doesnt fire. Replaced with old one and it runs fine! Just asked for a replacement.

No error codes at all. DiC probably still on its way out so will order another asap but CPS is the priority.

Also found a perished rocker cover breather pipe. Got a nasty split in it. Will have to replace too.


Thanks for the continued feedback!
 

·
Registered
Joined
·
547 Posts
What was the brand of your old CPS which is now back in the car and functioning? And what was the brand name of the CPS that you ordered and which was nonfunctional from the outset?Hopefully your replacement new CPS is an OEM Bosch and not a pro parts Sweden or other aftermarket brand. You don’t want to go through this again if you can avoid it.
 

·
Registered
Joined
·
175 Posts
Discussion Starter #20
Good point: to be honest it was a cheapo one from ebay... i know... lesson learnt!
 
1 - 20 of 25 Posts
Top