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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 10-30-2005, 05:54 PM   #1 (permalink)
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E34 miss fire

Hi

I have a 1990 e34 m20 engine. It seems to missfire occasionally but it only seems to do it when the engine is under strain, for example when accelerating hard or when for example you switch into 5th at about 30mph and floor it. It's hard to describe but its like some of the cylinders suddenly are not even fireing and then suddenly they will fire again. any ideas on what it is. Have checked the fuel filter and vaulve clearance. the distributor cap looks a bit old but could this be the problem. if so why does it only do it when the engine is under strain.

Please help

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Old 10-30-2005, 06:43 PM   #2 (permalink)
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I'd start by replacing the spark plugs because it may be that they are the wrong ones (incorrect heat range) or simply too old. And don't bother wasting your money on Platinum +2, +4, + anything. m20 doesn't like anything other than just normal, traditional spark plug.

btw. Are you sure your car is not chipped and you're running octane which is too low for it ?
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Old 10-31-2005, 07:52 AM   #3 (permalink)
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What do you mean by chipped?? It didn't used to do this it has only started recently. Using same petrol as always. Do you think it could be something as simple as spark plugs. I will give it a go. What model are the standard plugs.

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Old 10-31-2005, 10:32 AM   #4 (permalink)
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Ah never mind about the chip thing. I thought you just purchased the car. There are performance chips out there, which require the highest octane petrol and if you use too low of an octane they can do similar thing. Since yours obviously doesn't have a problem with that, disregard it.

I am using just regular Bosch plugs.
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