BMW 325i Won't Start

Tiny
CLEARMEADOW
  • MEMBER
  • 1932 BMW 325
Hello,
I love my BMW 325i, except that it is giving me hell currently. It has been having some trouble starting (sometimes needing to crank it 2-4X for 10 sec intervals before starting) and today, after starting it briefly then leaving it for 20 min, then trying to start it again, it turned over but didn't fire. Tried many times with no luck, let it sit, thought maybe it had flooded so I took out the spark plugs and cleaned them and replaced. Still no luck.

I know to check for a spark, will as soon as someone else is around. But don't know how to check for fuel pressure, coil etc. Any other reccomendations before I bite the BMW repair cost bullet and take it to a mechanic?


Your assistance is sincerely appreciated
Do you
have the same problem?
Yes
No
Wednesday, September 12th, 2007 AT 7:15 PM

6 Replies

Tiny
DR. HAGERTY
  • MEMBER
You didn't mention year or mileage but it sounds like the fuel pump. Depending on production date the pump was in the tank from 9/88. When it doesn't start, take the rear seat bottom up and thump the fuel pump (on the passenger side) with a screw driver handle or I just use my fist, if it starts replace the fuel pump and the main and fuel pump relays.
Was this
answer
helpful?
Yes
No
Thursday, September 13th, 2007 AT 1:42 AM
Tiny
CLEARMEADOW
  • MEMBER
Thanks for the response, I will give that a try today. The car is an '87 with 211k miles on it.
Was this
answer
helpful?
Yes
No
Thursday, September 13th, 2007 AT 10:37 AM
Tiny
DR. HAGERTY
  • MEMBER
For an '87 car, try replacement of the main and fuel pump relays first. The earlier cars have the fuel pump outside the tank.
Was this
answer
helpful?
Yes
No
Thursday, September 13th, 2007 AT 11:11 AM
Tiny
CLEARMEADOW
  • MEMBER
Is there a main relay that is different from the fuel pump relay?

Also:
I had thought my car was a 325i because that is what the last person that owned it claimed it was, but I just figured out (because of the reduced redline and name on the back) that it is just simply a 325 (with an eta engine). In case this is pertenant to anything.
Was this
answer
helpful?
Yes
No
Thursday, September 13th, 2007 AT 3:27 PM
Tiny
CLEARMEADOW
  • MEMBER
Ignore the last question, I got a repair manual and realize that there is a main relay as well.

Now for the update:
I checked for fuel pressure at the inlet to the injector and found it was pressurized, tried starting (nope), checked spark plug 1 for spark and found it was sparking, then took out and put back a large black relay in the fuse box (later found out this is my wiper control unit, so I'm sure that did a lot of good), and turned the key and started it up to my complete suprise, then drove around for a bit to replace the 30X attempted starts battery drain.

So, I know that something is in the process of going. But am completely boggled as to what it is. I read something about a "crank sensor" that someone else was having trouble with that also caused this intermittent starting issue.

Could this be the problem? What would cause it to start up sometimes, and not at others?
Was this
answer
helpful?
Yes
No
Thursday, September 13th, 2007 AT 5:58 PM
Tiny
CLEARMEADOW
  • MEMBER
Well I got around to pulling the distributor and it looks like if that wasn't the problem it was definitely contributing as it was very corroded with deep grooves cut into it. Never thought it could cause trouble starting, always though it was more of a running roughly/lack of power issue. Learn something new every day.
Was this
answer
helpful?
Yes
No
Thursday, September 13th, 2007 AT 6:47 PM

Please login or register to post a reply.

Recommended Guides