Bought a 1999 saab 93 a few weeks ago it has a full service history with £650 spend on it in Aug this year. It had been lying up for a few week. When i first drove it it was a dream but in the last week it has started to buck in every gear when the revs hit 2000. Have no idea where to start to solve this problem. Please help as i am new to Saabs.
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The DPF (diesel particulate filter) will require regeneration. This is a filter inside the catalytic convertor which has to be really really hot to regenerate on its own. Try running the car as normal for 15 minutes to normal operating temp, then drive it for 3 or 4 miles in 2nd or 3rd gear at 4 or 5000 revs and this will heat up the catatlyst and MAY regenerate, if not your saab dealer will need to do it with their diagnostic machine.
Cars with DFP's need to have a good rev out run weekly to avoid this happening again.Also make sure you are using the correct engine oil spec when servicing as this can casue issues with it.
If i were you i would get back to where you bought it as soon as posible, if he's any kind of dealer and with a reputation to uphold he will fix it for you, and you say he specializes on this type of car he most likely knows whats wrong with it.
First of all I would buy my gas at a different location. Sound like your getting water from somewhere. The gas we get today isn't what it used to be. If you still on the same tank of gas, i would use more heat, until you can put more fresh gas in it.....