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Discussion Starter · #1 ·
I own a 94 9000 2.3t cse. My problem is the car is hesitant when accelerating, with a slight 'misfire'. The problem has been there for about 6 months but was barely noticable at first but has worsened considerably over the past couple of weeks. It occurs mainly between 1500 - 3000 revs and seems to clear itself once past this. The engine doesn't pull smoothly at all. I also get an occasional small backfire when starting the car. Having read previous threads I wondered if it could be the DI unit but most other members tend to have problems over 3000 revs and not below. I took the DI unit off today but there are no signs of any problems ie weeping oil. The car is no different whether accelerating gently or hard. Unfortunately I do not know anybody with a Saab whose unit I could try and I'm not sure how friendly my main dealer is (although he is expensive!). Any suggestions would be grately appreciated. PS. are all DI units the same whatever the model etc?
Thanks
 

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Simon
Sounds like your problem is simlar to mine, tried to start a new thread "Missfire" on the 19th but no replies as yet. I also own a
94 9000 2.0 on closer examination my DI unit seem o.k. compared to comments on other threads and the car as only done a Gen 54K it would appear that 100K is the norm.
Dealers are unlikely to co-operate, I have managed to find a Saab breakers who will let me try it first they are charging £50 for the unit. My missfire has now got realy bad and i must get it fixed next week, Although it gets progressively worse as the car gets hotter. You dont mention your location.
 

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Make sure plugs are good and only use NGK (BCPR7ES-11 I think - well they are for a 2.0L turbo). Next check earthing wires for DI wiring - onto the inlet manifold. Make sure connector to DI unit and air mass meter are also clean.
 

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Discussion Starter · #4 ·
Martyn and Adrian
Thanks for your comments. My plugs are fairly new (2000 miles) and are NGK fitted by my local Saab specialist at the last service. The problem was there before the service and the plugs made no difference. I live in Canterbury (Kent) and went to the main agent last week (Canterbury Saab) when the problem got really bad (read annoying). They very kindly let me try a new DI unit to see if it made a difference. I paid for the unit in full along with £15 labour but it didn't cure the problem and they gave me a full refund (with the exception of the labour) the following day. I then changed the turbo boost solenoid at their recommendation and that seemed to help things considerably, smoothing a lot of the low down hesitantcy. The part changed is a small unit on top of the radiator with three pipes going to it but I'm not sure the 2.0 has one. My problem has nearly gone but it is still not quite right and the car his missed a couple of times in the last 50 miles or so. It does seem worse when the car is hot. I am beginning to think I may have a couple of faults which are having a similar effect on the running and I may have cured one of them. I have checked the earth lead to the DI unit (the short lead that goes from the engine mount on the drivers side to the inlet manifold) but where is the other connection you suggest I check? Any other suggestions would be appreciated

Thanks
Simon
 
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