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General E46 Forum
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Old 10-08-2015, 11:20 PM   #1
Mitchell_friedman
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E46 box relay clicking no start

my e46 sometimes when i turn key to on position a relay under e-box starts clicking rapidly and car wouldn't start just keeps cranking over, after a while of clicking fuel pump finally turns on and car will start. i replaced fuel injector relay and fuel pump relay under glovebox but i still am getting that rapid on off clicking every once and a while and car takes a while to start. could be maby low voltage to that relay? could it be a different relay? also when it clicks, my decline assist button flashes green and thats when car won't start just cranks over a bunch until the light turns solid green and the clicking noise stops coming from the e-box and then the car starts right up. please help! what other relay could it be that would cause that? what is the voltage that should be running to the relay terminals? i would like to set to see if i have proper voltage.
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Old 10-09-2015, 06:15 AM   #2
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There is a DME relay that could be doing it.

Open your e-box to see which one.
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Old 10-09-2015, 08:38 AM   #3
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The relays are all 12VDC. What's the status of your battery. The ECU provides a found to each relay coil at the appropriate time. That is, the coil receives 12VDC on one terminal and the ECU provides the ground. The 2 together make the relay contacts come together. If the coil is receiving low voltage from the battery the ground from the ECU will not work properly.
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Old 10-09-2015, 09:13 AM   #4
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Measure your battery voltage. It must be 12.6V or higher. I bet your battery is shot.
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Old 10-11-2015, 11:40 PM   #5
Mitchell_friedman
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E46 coolant

Just replaced thermostat and there was a conciderable amount of copper looking metal shavings in the coolant i can even seea pile ontop of the floatstick in the resevor. What could possibly put that in the coolant? Water pump impeller??
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Old 10-12-2015, 06:54 AM   #6
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Probably the pump bearing. It's probably bronze. I recommend you perform a cooling system overhaul. See Mango's sticky.
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Old 10-12-2015, 06:58 AM   #7
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Quote:
Originally Posted by Mitchell_friedman View Post
Just replaced thermostat and there was a conciderable amount of copper looking metal shavings in the coolant i can even seea pile ontop of the floatstick in the resevor. What could possibly put that in the coolant? Water pump impeller??
Sounds like "BARS Leaks" --stuff you add to coolant to stop leaks...like leaks that might have come from an overheat.

Did you get your car in the last few months? If so, I'd drain, rinse, until the system is clear of that stuff. Use water...distilled with the final rinse...and find your leak. It's either in the system itself somewhere or the head/headgasket, or possibly from the cabin heating system (probably not this).

Find leak first...that will determine where to go next.

On your clicking, find the exact source of it and that will tell you how to deal with that. Which relay is clicking?

hth
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Old 10-12-2015, 09:55 AM   #8
Mitchell_friedman
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Quote:
Originally Posted by dmax View Post
Sounds like "BARS Leaks" --stuff you add to coolant to stop leaks...like leaks that might have come from an overheat.

Did you get your car in the last few months? If so, I'd drain, rinse, until the system is clear of that stuff. Use water...distilled with the final rinse...and find your leak. It's either in the system itself somewhere or the head/headgasket, or possibly from the cabin heating system (probably not this).

Find leak first...that will determine where to go next.

On your clicking, find the exact source of it and that will tell you how to deal with that. Which relay is clicking?

hth
Thanks for info, when i put car on my lifts i noticed the shitty plastic drain screw on the radiator was all mangled looked like the owner before me could have stripped it or broke it and still tried to make it work. That may be why they put the leak prevention stuff in. Also on the side of the resevor tank there is like a hairline fracture that may have been leaking fluid, hard to tell. But also how to i flush system? Just drain, fill, run, drain,fill, run, repeat? Or is there somtjing that can be hooked up to push clean water through the system
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