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Old 07-31-2017, 08:50 PM   #1
leightone30
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E30: 1985 325e, 1989 325is
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I've had my 1989 325i vert 2 years, the car has been running great not a daily but drove it a few times a week sometimes more, all of a sudden it started having miss firing issues so I started changing the usual suspects, and decided to over haul quite a few things, I've changed everything all OEM or Bosch
Fuel pump & Filter
IVC
Throttle position sensor
CTS
Spark plug Wire set
Ignition coil
Crank sensor
Spark plugs
Fuel pressure regulator

After all this it ran like a champ for drove it all day Saturday and Sunday when I went to start it wouldn't fire off, ended up installing a new Distributior cap & Rotor and still nothing? Any ideas?
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Old 08-01-2017, 10:21 AM   #2
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E30: 1987 ALP 325IS / 04 Tiag M3
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Go through the usual checklist starting with park and fuel then go from there. Thats a lot of new parts that may or may not be the issue. No start to me says it has to be spark or fuel.
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Old 08-02-2017, 06:40 AM   #3
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my 89 would end up being the crank sensor when it would miss fire. every time
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Old 08-10-2017, 01:23 PM   #4
M20_Fever
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E30: '90 328iS
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^^^This, check the wire from the CPS across thr front of the block to the plug next to the throttle body. They tend to wear through the wire where it runs behind the coolant crossover and ground out to the block. Chased that bugger for weeks before I just replaced the CPS and found the damaged wire.
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