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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-23-2007, 09:43 PM   #1
soongyul85
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ANOTHER e46 wont start thread...

so went out to try and start 2004 325i 4dr manual 5spd. today.
crank crank crank wont start turns over fine everything else works.
so far i have.... checked the trunk fuse next to the battery. i did a jumped on it to bypass it and it did not help...
i have swapped my WORKING horn relay with the fuel pump relay...
pump still doesn't turn on... i think im not sure if i can hear it clearly because of the dinging in the door... but im pretty sure its not on because i kinda wiggled the relay in and out to try and trip the pump on and off-nothing happened.
i tried 2 keys and the valet key no change there.
jumped the car using an extra battery, no change there. my next courses of action are replacing the FUEL PUMP and replacing relay #1 and relay #3 in the underhood relay panel ... http://www.realoem.com/bmw/showparts...02&hg=61&fg=25

i also used my MAC OBD2 code reader and at first i had a crank angle sensor code? like a 533 or something like that but i cleared it and it never came back... so i have no codes being thrown at my reader.
this is very frustrating. as you can imagine.
oh and it is very cold outside!!!
but the car is in the garage



oh and for people who are searching because their car does not start, try the fuel pump/horn relay swap.... seen here on this link.
http://www.realoem.com/bmw/showparts...00&hg=61&fg=25 #3 and #6...
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Old 11-23-2007, 10:06 PM   #2
soongyul85
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sure hope i can go to work tomorrow!
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Old 11-23-2007, 10:08 PM   #3
samBROchill330i
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you could always take the bumble bee...i mean banana...sh1t i mean the integra ?

just kiddin buddy i hope you get yer e46 worked out! let us know!
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Old 11-23-2007, 10:32 PM   #4
rondo
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hi if you cant hear your fuel pump you can test with a volt meter at the pump to determine if 12v is reaching it nor not ,there is a 6 pin connector under rear seat right side.pin#1brown is ground pin#2white/blue should be 12v when key is on .Do you have a voltmeter? hope this helps..
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Old 11-24-2007, 02:36 AM   #5
soongyul85
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loaned out my voltmeter, and this account is my girlfriends (owner of the black sedan) i am/was the owner of that sexy banana. it was stolen last week so between the two of us we have 1 BMX i guess tomorrow im getting sent down to BMW which is approx. 15-18 miles away. and pick up all the relays for the underhood box. then ill see what i can do after that.
first the DC2 then the e46. when it rains it pours
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Old 11-24-2007, 05:18 PM   #6
soongyul85
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all the BMW stealerships were closed today!
i reallllly don't want to wait till monday any OREGON/VANCOUVER fanatics want to sell/TAX me for those underhood relays out of their own/spare/race/parts car? email me if so halesupport@msn.com i was supposed to show houses today!!!
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Old 11-30-2007, 03:27 PM   #7
king_43
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any word yet on if you got it to work yet? I've done everything you've mentioned above, fuel pump works becasue i ran a hotwire to it and sure enough i hear it, swapped out the relays still crank but no start...Gonna check the coils tonight
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Old 11-30-2007, 03:57 PM   #8
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i have the same problem, let me know what u find out about the coils...
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Old 11-30-2007, 11:31 PM   #9
king_43
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will do just pm me so i wont loose this post in all the others
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Old 12-01-2007, 05:28 PM   #10
soongyul85
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i checked the coils and spark and they both worked perfectly. i invited my friend over because i needed a ride to go buy starting fluid. sprayed some in the intake . and it fired right up then died when the fluid ran out. went to start it again. and it worked perfectly....

for about a week.

this morning i drove to the gas station and under 2200 RPM it was bogging. and fine at higher rpm. after i got a fresh tank of 92 car wouldn't start. the fuel pump was sending fuel. just very weakly. i could turn the key 15 times or so and have enough pressure to idle for 2 seconds or so. but i had to tow it home. now im right where i was last week. saturday dealerships closed except this time it is snowing. im going to find a ride to get a voltimeter now, anyone else have some suggestions?
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Old 12-01-2007, 08:03 PM   #11
bmw_rider
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I towed my car to a buddy of mine shop, he tested the fuel pump with a 12 volt meter and sure it was the fuel pump that is out, so i need to replace the fuel pump, i will let u know if fuel pump is the peoblem..
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Old 12-01-2007, 08:06 PM   #12
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sounds like it's time for a new pump. pretty easy DIY. did both of my BMWs in less than 20 min each
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Old 12-01-2007, 09:10 PM   #13
king_43
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i just checked my coils and then spark plugs and OMG!! the spark plugs are shot to hell....Just picked up 6 about to install them and hopefully it'll fire up!
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Old 12-01-2007, 11:26 PM   #14
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YAY!!!!!!!!! After about a month of no car (been busy bullding on the house) and checking things when I get the chance and after checking fuel pump, fuel pump relay, everything I can think of I finally decided to check coils/sparkplugs...After all this time it was the sparkplugs!!! Went to autozone got 6 sparkplugs put em in and it fired right up!!!
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Old 12-02-2007, 01:24 AM   #15
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Do you have a DIY with pic for changing the fuel pump?

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Originally Posted by dirsh View Post
sounds like it's time for a new pump. pretty easy DIY. did both of my BMWs in less than 20 min each
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Old 12-02-2007, 08:27 AM   #16
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E46 Difficult to start?

Hi there. I hope I'm not too late replying to your post but just seen it. About 12 -15 months ago my 2001 318Ci became hard to start first time. The engine would turn over okay but it sounded like a fuel starvation problem. The problem only occurred when the car was cold, i.e first thing in the morning and after sitting all day in the carpark at work. I decided to bite the bullet and took it to the stealership. They diagnosed a new Disa valve which they replaced. Upon collection of the car, same thing happened again. I immediately went back into the shop and let them know what I thought of them. They took the car back in, a few days later and traced the fuel supply all the way from the tank to the engine, where they found a fuel actuator valve (??) had become carbonised (deposit of soot built up) which was difficult to actuate when cold hence the lack of fuel and non-starting when the car was cold. They cleaned this and the problem was solved, however one year on and the problem is back along with the cold weather. This might be worth checking out, although your car is younger than mine. Good luck.
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Old 12-09-2007, 08:57 AM   #17
mbadger
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Well, I'm definitely waiting with baited breath to see how this pans out. I have the exact symptoms Coupman and Soongyul85 describe:

- cold
- cranks great everytime
- happens in the morning on the 1st start of the day and after work sitting all day (works fine at lunch time still)

I checked a lot of other threads and have since changed the Fuel Filter. I have yet to try the fuel pump relay/horn relay swap which I will try today.

I know the fuel pump works great, because after my fuel filter swap, I accidentally disconnected a line between the filter and engine and the driveway was flooded with gas on my first crank!!

I'll let you know if the relay solves the problem...
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Old 12-09-2007, 11:11 AM   #18
mbadger
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It was the Fuel Pump Relay...... I swapped it with the Horn Relay as suggested and it fired up the 1st time right away.

Seems like the diagnosis is tricky with so many "won't start"/cranking not starting symptoms, so I guess the best rule of thumb for DIY'ers is to try all the remedies that won't cost $$ 1st.

By far switching the horn relay with the fuel pump relay is the most inexpensive. You'll know right away if it fixes the issue and then all you have to do is buy a replacement.

Thanks goes to you guys and e46fanatics.com ..
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Old 12-10-2007, 01:52 PM   #19
dirsh
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I keep telling people to try that first
I never get any credit
lol
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Old 12-12-2007, 09:17 PM   #20
soongyul85
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it was the fuel pump swapped it out works great $180 +15 for relay replacement 195$ total repair cost =)
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