My "new to me" '87 325is turns over, but I don't seem to be getting a spark. Any insights into possible causes?
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Turns over, no spark...what the!?
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[QUOTE=FrictionTape;4696471]Originally posted by e30onBBSs View PostHow did you conclude it is the fuel pump?[/QUOTE
I disconnected the fuel line off the motor, not fuel came out when the ignition was turned on. Faulty logic?sigpic
HyperWerkz
89 mtech2, s50, AR Kit, borgwarner s362, e-85, 15psi... 592whp
" enjoy the show "
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[QUOTE=FrictionTape;4696471]Originally posted by e30onBBSs View PostHow did you conclude it is the fuel pump?[/QUOTE
I disconnected the fuel line off the motor, not fuel came out when the ignition was turned on. Faulty logic?
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Originally posted by Yungbimmer View PostWhen your main relay or crank position sensor go out the engine wont recieve spark or fuel. The ecu only sends a signal to your fuel pump once it recognizes that the engine is spinning.
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Make sure you have gas as well. As dumb as that sounds it happens. Sometimes the transfer from one side of the tank to the other won't happen (siphon jet or something) and the tank will read half, but the pump side has 0. So just because it's dry doesn't mean you necessarily need a new fuel pump.
After you verify you have gas, and still no spark, run the diag for the CPS in the Bentley. Also give this a read. It will help you understand the system and has some diagnoses pointers. http://www.e30zone.net/e30zonewiki/index.php/Ignition
Also, which hose did you disconnect? Top or bottom? Top is the feed line, bottom is the return.
A really easy way to check for fuel is to jump the fuel relay from pin 30 to 87. Verify those pins to the Bentley manual but I'm pretty sure that's them. This will force the fuel pump to run. Before you jump the pins, disconnect the fuel line that goes to the FPR (top line). Put this line into a bottle, then jump the pump. I would take the rear seat out to see/hear/feel the pump if it's doing anything. And this is how you would check for gas anyways, by opening the cover of the passenger side, removing the pump, and looking into the tank to confirm you have gas.BMW tech
Umass Amherst
05 wrx sti
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Originally posted by e30onBBSs View PostMake sure you have gas as well. As dumb as that sounds it happens. Sometimes the transfer from one side of the tank to the other won't happen (siphon jet or something) and the tank will read half, but the pump side has 0. So just because it's dry doesn't mean you necessarily need a new fuel pump.
After you verify you have gas, and still no spark, run the diag for the CPS in the Bentley. Also give this a read. It will help you understand the system and has some diagnoses pointers. http://www.e30zone.net/e30zonewiki/index.php/Ignition
Also, which hose did you disconnect? Top or bottom? Top is the feed line, bottom is the return.
A really easy way to check for fuel is to jump the fuel relay from pin 30 to 87. Verify those pins to the Bentley manual but I'm pretty sure that's them. This will force the fuel pump to run. Before you jump the pins, disconnect the fuel line that goes to the FPR (top line). Put this line into a bottle, then jump the pump. I would take the rear seat out to see/hear/feel the pump if it's doing anything. And this is how you would check for gas anyways, by opening the cover of the passenger side, removing the pump, and looking into the tank to confirm you have gas.
This car sat for over 6 years and the previous owner must have planned on it sitting as it has a completely full tank of fuel. Now whether or not stabilizer was put in is anyone's guess. As for the gas line, we removed the upper hose.
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