87 325i will not start - BMW Forum

zsaint38 · 10-11-2009, 02:41 PM

I need help in finding the crankshaft sensor. I look all on the bell housing and can not find it I found to holes that had like a b and d or something like that on it but did not find any sensors please help me thanks ziggy

k.sidlosky · 10-11-2009, 04:42 PM

Its in the front of the motor, towards the bottom. Check you coil prior to replacing the crank sensor. Had no spark on mine, replaced the crank sensor and still no spark. Bought an accel coil and that did it.

zsaint38 · 10-11-2009, 04:56 PM

when I jump the relay the pump turns on and builds pressure but when I put the relay back in nothing happens with pressure I can here a buzzing sound coming from the round thing on the tb it just turns over n over but did not c a spark and no pressure on fuel rail feeder line

k.sidlosky · 10-11-2009, 05:18 PM

relays arnt expensive at all, go to your parts store get a realy then see if that fixes your fuel problem. The fuel system has more components than the ignition.

johnnyBgood · 10-11-2009, 05:31 PM

Quote:

Originally Posted by k.sidlosky

relays arnt expensive at all, go to your parts store get a realy then see if that fixes your fuel problem. The fuel system has more components than the ignition.

+1......by jumping out the relay using one wire, maybe only activating part of what that relay is responsible for.......you also have to be careful doing that, because you will start blowing fuses......replace the relay.

jb

silversled · 10-12-2009, 07:48 PM

yep, the crankshaft sensor is on the front of the engine. It sits almost directly below the distributor cap. But about 1 foot down..... but actually
the crank shaft sensor shouldn't have anything to do with anything unless
the engine won't start at all....then it's an issue....

zsaint38 · 10-12-2009, 09:48 PM

Quote:

Originally Posted by silversled

yep, the crankshaft sensor is on the front of the engine. It sits almost directly below the distributor cap. But about 1 foot down..... but actually
the crank shaft sensor shouldn't have anything to do with anything unless
the engine won't start at all....then it's an issue....

It doesn't start at all. Do u know if I can like bypass or just complete the circuit? U know how u can the neutral safety switch if so I was gonna try

elsabor67 · 10-12-2009, 10:34 PM

Quote:

Originally Posted by zsaint38

It doesn't start at all. Do u know if I can like bypass or just complete the circuit? U know how u can the neutral safety switch if so I was gonna try

You really can't bypass the crankshaft Pos. sensor becuase it's what tells the ecu when to send the spark to the plugs. I would recommend to you to double check the CPS again.

The round thing by the tb is the ICV valve and has nothing to do with the spark. If you hear it buzzing, that is a good thing because it means that its working.

silversled · 10-15-2009, 07:57 PM

actually the crankshaft position sensor is really easy to replace. Just jack the front end up and look for this sprocket like thing under the water pump stuff and look for this little thing that looks like a lipstick holder over to the passengers side, held in by 2 allen screws...that's the crank shaft sensor....It has a plug to it and has to be adjusted like old time ignition points as far as gap goes. One of the teeth on this sprocket has a magnet on it and the sprocket is attached to the crankshaft. As the the engine spins this magnet
whirls past the crankshaft sensor and signals the computer as to where TDC is and therefore, when to fire up the injection and ignition systems. From that point forward the ECU has control and will continue to control the engine
until the next time it needs this input....

zsaint38 · 10-15-2009, 09:06 PM

Thanks silversled for the info. I went ahead and ordered a cps today for 77.00. Hope that fixes it

k.sidlosky · 10-16-2009, 06:57 PM

Should have tested it befor eyou ordered it. Its going to suck when you have to buy a coil too. But hopefully it fixes it.