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Old 01-12-2013, 05:56 AM
Billwill Billwill is offline
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Location: South Africa
Join Date: Oct 2009
Posts: 529
Mein Auto: BMW E30 318i 1991
Originally Posted by Luke1985 View Post
Hi All,

My 89' 318i is missing at low revs, I've tried a lot of things including, new plugs, new leads, new coil, new battery, checked distributor, replaced vacuum hoses, (although not sure if I did them all but the two I can see are done)

I'm now lost as it is still missing but as you go higher up the range the misfire stops.

Does anyone have any suggestions? Help/advice would be greatly appreciated!

Thanks in advance....
I presume this is the 318i M40?

Only use the NGK spark plugs...strangely the E30 does not like Bosch plugs.
If you replaced the leads...did you get OEM ones with the extra lead wrapped around lead number 4 to set the timing? It will run without that extra lead but not as good.

You need to spray some Carb Cleaner around all the hoses and gaskets in the inlet area to look for air leaks...very common on an M40.

Could be the AFM, the camshaft timing or camshaft wear.

You need to have a look at the cam belt to check its condition and check the cam timing while you are about it.

The best site for advise on the M40 318i is the UK site:
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