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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 01-05-2015, 06:41 PM   #1
Registered User
Join Date: May 2011
Location: Atlanta
Posts: 16
My Ride: 2003 330i ZHP
2003 330i Doesn't start. Please Help!!

Ok, was replacing the final stage resistor to fix my AC blower problem this past Saturday and the car started fine. I did check fuses then, because the FSR didn't fix the blower motor problem. Bad blower motor I guess and I ordered that. This thread is about my escapades today.

Today I went to start the car and it busted off, then stuttered and died. Then nothing. This happened to me in June of 2014 as well. Then, I searched the forum, then tapped the fuel pump and to my delight, the car started! I ordered a replacement fuel pump and replaced it within a week.

No issues until today. The battery is fine and the motor turns over fine. I hitched a ride to work and contemplated my predicament. Could the new pump I bought 6 months ago ($150 from Bavauto) gone bad already? I doubt it. Could I have bumped the fuse out of place during my fuse panel visit Saturday? Maybe. I'll check that when I get home, I said. I really thought the no start was related to my FSR replacement work.

Well, I checked the fuse and it looks fine. When I put my ear to the pump with the key on, the pump sounds like it's priming. I charged the battery and motored the engine. It got faster and faster and started to sound like intermittent combustion was happening and wanted to start. I imagined that the piston motoring was pulling a vacuum on the fuel line and was getting just enough fuel to start trying to start. I tapped the gas pedal in an attempt to get it going but it didn't work. I felt like motoring the engine or starter that much wasn't good for the car, so I quit.

Fuel filter was replaced approximately 1.5 years ago.
Fuel pump relay has never been replaced by me (bought the car with 88K, it now has 150K), but with the pump priming, I didn't think it was the relay. Wouldn't a bad relay prevent the pump from working at all?

Tomorrow, I plan to buy some starting fluid and spray it in the intake just past the filter. If it starts and dies, then I know that it's a fuel delivery problem.

The only code I got was the oil temp sensor code.
The tach moves a little bit during motoring so I have read that means the crank position sensor probably isn't bad.
The tank is 3/4 full.
No issues prior to today. No rough idle or poor engine performance whatsoever.

Should I switch the horn and pump relay and see if that works?

Should I buy a fuel pressure meter and measure the fuel pressure under the hood on the fuel manifold?

Any other fuses to check?

Fuel filter clogged already?

How can I check for proper ignition?

I can do almost any work to this car myself, but diagnosing this issue is frustrating me.

Please help. Sorry for the long post, but I wanted to include as much detail as possible.

Last edited by Anferney; 01-06-2015 at 08:02 AM.
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