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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 06-04-2007, 08:41 PM   #1 (permalink)
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Angry Start problem

Hello everyone. I am new to this forum and I have problems starting my E21. I rebuilt engine, new pistons, new rings, seals, resurfaced head, the whole works. Timing is perfect, valves adjusted to specs, have spark on all four, firing sequence OK, fuel is going to all injectors, (tested them separately before installation), cold start valve squirts for about two seconds, fuel pressure at fuel distributor is about 64 psi, starter cranks and cranks but no start. Oil pan is getting gas, dip stick shows about one quarter inch over original oil level.

Revised grounds, checked all vaccuum lines for leaks. Don't know what else to do. I am going nuts, Please help, any new ideas? Thanks.
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Old 06-06-2007, 12:10 AM   #2 (permalink)
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Make sure you are getting spark on compression stroke. Pull a plug wire and plug out, stick the plug back into the wire and lay on metal somewhere you can see it clearly, and have someone crank it, the plug should spark exactly as you hear a loud POOF from the plug hole. If it doesn't, your distributor is off.

Lastly do a compression test.
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Old 06-06-2007, 12:34 PM   #3 (permalink)
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Unhappy Problems with start

Sorry, my computer crashed and I was out for a day and a half.
Thank you Starmavin for your suggestions. I did exactly that which you are suggesting. Verified that the timing is correct. Crank pulley aligns with Cam gear marking and distributor is pointing to cylinder one.

I checked compression by utting my hand on each plug hole with and I feel a fair ammount of air trying to move my hand out of the way. I have no way of measuring pressure at that point. When I take the plug out I see a nice spark firing at that exact time. The one thing I noticed, is that my starter cranks very slow. I am ordering a new one which will come in a couple of days. Meantime I removed and I am taking apart the starter. I see no obvious damage. Brushes are about half worn out. Will put it back together and will test it again to see what happens.
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Old 06-07-2007, 09:47 AM   #4 (permalink)
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Start problems

I tested the starter on a bench after assembling and observed that it moves too slow. So I am discarding it as core and getting a new one. Hope this will resolve my problem. Everything else, except the alternator, Warm up Regulator and distributor are new on this engine.
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Old 06-07-2007, 09:16 PM   #5 (permalink)
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Make sure your plugs are not fuel fouled also.
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Old 06-08-2007, 01:38 PM   #6 (permalink)
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Start problems

I checked fuel in the plugs. First they were getting very wet, to the point that the level of the oil went up one quater of an inch on the stick. Then, I turned the air/fuel mixture set screw conterclockwise until only the cold start valve squirts for two seconds. It shoud start with that much fuel, but it doesn't. I am waiting for my starter. It will be here Monday. Then we'll see.
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Old 06-08-2007, 05:19 PM   #7 (permalink)
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CHANGE YOUR OIL OUT! That much fuel in the oil will not only ruin your bearings when it runs but if it fire up there is a good chance you can have a crank case fire or explosion....
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