Saab 95 2.2diesel - smoking diesel

Honest John Back Room » Technical matters
What do you think of Elon Musk? Have your say | No thanks
View Threaded
Sun 4 Jul 2010 19:49
Saab 95 2.2diesel - smoking diesel - loz-1

I have an 04 plate Saab 95 2.2 turbo diesel, that has started to run very rough. it has 55,000 on the clock, and was serviced @50,000. it starts without any problem, and runs well until it gets up to temperature, then it runs very rough, blows too much smoke, and is using too much fuel (down from av. 45 mpg to 38 mpg). When running, it accellerates ok, but when it is held on a steady thottle, you can feel the engine hunting, and it blows a lot of smoke, can anyone help me?

Reply | Report as offensive | Link
Sun 4 Jul 2010 22:33
Saab 95 2.2diesel - smoking diesel - Peter.N.

Nothing much you can do yourself I'm afraid. you will have to get the fault codes read. It will be a fuel injection fault of some sort.

Reply | Report as offensive | Link
Sun 4 Jul 2010 22:59
Saab 95 2.2diesel - smoking diesel - Gregory II

It could perhaps have something to do with the service. Unlikely, but sometimes non-original parts might cause this problem, or incorrect oil perhaps? Do any MIL lights appear on the dash?

Reply | Report as offensive | Link
Mon 5 Jul 2010 12:14
Saab 95 2.2diesel - smoking diesel - loz-1

no lights on dash board, all clear as soon as start up check is complete. I have spoken to WMSS (saab specialist in Birmingham), and they think it could be a split pipe of some sort. i have looked at the air filter, looks clean to me. The car has been faultless for 3000 miles, then it has started playing up.

Reply | Report as offensive | Link
Mon 23 Aug 2010 17:17
Saab 95 2.2diesel - smoking diesel - SaabAddict 9-3

Just a possibility if your problem is not already sorted. I have a 9-3 1.9 Tid and mine as we speak about to go into the garage with an injector problem. I have injector 4 which is badly over fueling and making the car smoke more than normal and this is also causing a misfire and sometimes hesitation at certain revs.

Regards

Reply | Report as offensive | Link
Mon 23 Aug 2010 21:10
Saab 95 2.2diesel - smoking diesel - Roly93

Sorry 1.9 is a vastly different engine to the 2.2.

The 1.9 is CR, the 2.2 is old fashioned direct shock-injectors.

It is very hard to say what this problem could be at the moment from the info we have. If the car idles okay, but drinks and smokes, it could be EGR valve, or maybe MAF sensor maybe ?

Reply | Report as offensive | Link
Tue 24 Aug 2010 10:41
Saab 95 2.2diesel - smoking diesel - StanTheMan78

As Roly says, the 2.2 was Saab's first foray into the diesel world - and it's a GM engine with also-ran old school technology: the 1.9 is a FIAT common-rail (JTD / M-Jet) engine. I actually doubt it has an EGR and MAF in the first place! I'd suspect faulty injectors, or, if it has one, the EGR valve stuck becuase it will be completely clogged with soot. MAF (again if it has one) I do not think - MAF's symptoms usually include loss of power and are independent of engine operating temperature.

To me the prime suspect is the catalyzer!

Reply | Report as offensive | Link
Tue 24 Aug 2010 10:50
Saab 95 2.2diesel - smoking diesel - madf

it starts without any problem, and runs well until it gets up to temperature, then it runs very rough, blows too much smoke, and is using too much fuel (down from av. 45 mpg to 38 mpg).

When running, it accellerates ok, but when it is held on a steady thottle, you can feel the engine hunting, and it blows a lot of smoke, can anyone help me?

So it's NOT the cat : works OK when cold.

Not fuel injection probably - works when cold.

Problem is when running steady when hot - which is when the EGR valve kicks in..

My first port of call AND CHEAPEST AND EASIEST . is clean EGR valve. Probably blocked.

Reply | Report as offensive | Link
Tue 24 Aug 2010 11:41
Saab 95 2.2diesel - smoking diesel - StanTheMan78

When cold the CAT is not even in operation yet: it starts working only when fully warm. If it is clogged then the engine will run erratically both under load and with static accelerator pedal, as well as smoke copiously.

EGR is also another suspect, but as said before I doubt it has one at all.

Reply | Report as offensive | Link

Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.

The Good Garage Guide

If you cover no more than 100 miles per day and have easy access to a charging point at home or work, then an EV is ideal for you.

Is an electric car right for me?