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Re: '92 BMW 318 doesn't start
More info needed. Is this a stick or automatic transmission? Check to see if you get power at the starter "trigger" wire (small wire on the front of the starter) If you don't, you might have a bad neutral safety switch (automatic) or a bad clutch safety switch (manual trans). You could also have a bad starter relay (under dash, left of steering column) Charlie
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check the earth wire, sometimes they are lose enough to be problematic. Although if turning over and not firing up, does sound like immobiliser issue. Are you using the master key? although I'm not sure about 1994, should deativate once unlocked with key, unless after market alarm set up
there may be a damaged wire coming from the receiver ring which sits round your ignition lock, this "reads" your key and allows the starter to turn your engine over so if there is an intermittant fault here that could cause your non-starting.
You did not mention wether it was an automatic or stick shift.
The wire running to the starter soleniod will run through either the clutch switch or the neutral safety switch to prevent the vehicle from starting in gear. This will be the most likely cause of your problem.
Hope that helps.
more info....Does the engine turn over? Or do you get absolutely no response?
Did the car operate correctly and then all of a sudden not work? Or was the
starting problem getting worse and worse? If you get no response, I would
'hot wire' the starter to make sure it works. Run a positive and negative
wire directly from the battery to the starter. If it turns over, you got a
wiring problem, either the starter wires or the battery connections. If the
starter turns over and it won't start - you have to find out if it is a fuel
problem or an electrical problem. You can get a tester from any auto parts
store to check if the spark plugs are firing. Just a couple of bucks. If
there is no spark, you got an electrical problem. If the plugs are firing,
you have a fuel problem. Disconnect the fuel line right after the fuel
regulator. Turn the car over to see if fuel is coming out. BE CAREFUL. Let it
squirt into some kind of container - don't let it shoot all over the place.
If you aren't getting fuel, you may need a fuel pump. If you are getting fuel
- do a compression test. You can get a compression tester pretty cheap, or
some places will loan or rent you one. It doesn't really matter too much what
the readings are - but they should all be about the same. If one cylinder is
lower than the others, you may have have a cracked head, broken valve - you
won't know until you get the head off. Even if the pressures are the same -
if this problem was creeping up on you, in other words it got harder and
harder to start - it could be worn out rings. How many miles on the car? I
could be rings if you have very high mileage on it - like 150000 miles.