Question about 1996 Saab 9000

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Engine hard to start at times, also runs rough at idle

Just replaced coil assembly(Saab specialist fitted second- hand unit),I was told the old one was faulty,but the vehicle is no better.

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Came across a fault similar to this a few years ago and it turned out to be the wires going into the distributor had become dry and brittle due to engine heat.Excessive resistance in the wires made vehicle hard to start and caused problems when accelerating hard.

Posted on Jan 10, 2009

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The 2 components that I would suspect would be the Coil pack and the Cam sensor.
I had a similar issue on a Sorento. Intermittent miss on one of the cylinders. The Coil pack was bad. When I replaced it, there was a burnt smell to the bad one. It sounds like things were a bit bumped around with this engine as the O2 sensor was bent. The Coil packs are very fragile.
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Well iv had this problem a few times in the past so will let you try some of them ,
1/ Fuel pump in fuel tank overheating ORfuel filter not letting fuel passing ,ANSWER remove fuel pipe to engine and feed into a bottle turn on key and see how much fuel comes out without stopping, if ok go to fuel tank and check the breather pipe (make sure its clear).
2/ If engine runs well when you first start without missing and idles well,but then dies at 15minutes
when you try to start again dose it seem to turn over faster or slower?
3/When engine running check the rear tail pipe on exhaust check for smoke and put you hand over the pipe hard to stop fumes (dose engine run rough and stop?),as the muffler or converter can be blocked more so when hot.{use a glove on your hand}.
4/When the engine stops take out No1 plug lead and fit a spare plug in it and lay on top of engine and spin engine over ,does it spark?? as it could be the coil overheating which would also do it if no spark.
5/ Chech coolant sensorplug for bad fitting Also check Crank Sencer and coil wire to distributor.
Let me know the results Ron

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