5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
Will not start. If I floor the pedal it will chug, but not run.
It wouldn't start twice today as I was out doing errands. I opened the hood and reseated the coil wire for grins. Both times it started and then ran great. Once home it would not start. Just the occasional chugging when floored. (I know, it's injected, I was desperate).
No sound from fuel pump with ignition switch to on.
No power at fuel pump fuse until cranking.
My guess would be the fuel pump relay, since the car ran great after banging around under the hood earlier in the day.
A fuel pump goes, and that's it (doesn't it?).
Can any of you experienced 535i bimmerfahrenmeisters tell me just which relay is the fuel pump relay? My guess is the one right outside the fuse box by the fuel pump fuse?
It's damn cold and dark out there at the end of my driveway.
Any clues from all you experienced bimmerfahrenmeisters?
Still trying. I let it sit all night nose down the hill in the driveway. It actually started this morning and ran long enough (although poorly) for me to get it 3/4 of the way up the hill towards the flat area where I will be changing the fuel pump.
Your advice about leaving the switch on for a few minutes sounds good, maybe the low pressure transfer pump will build up enough pressure for me to get it the last 20 feet up the hill and onto some ramps.
After doing a search of this site, I jumped contact 87 and 30 of the relay, but had no luck getting it even to chug. I guess it's the fuel pump.
Thanks for all the input.
Any other ideas before I shell out $211 for a new fuel pump?
Last edited by camper1159; 01-28-2007 at 02:15 PM.
Could be the fuel pump. I would still check it with a fuel pressure gauge or, at least crack a line to see what is going on. You don't want fuel spraying everywhere so be careful. Jumping a relay is a good idea to pressure check one and bypass that part of the system.
You can also pull the plug from the MAF sensor and see if it runs better.On some of the older systems if the MAF is bad the computer will revert to a default fuel curve and run better. This is only diagnostic if it runs better....worth a shot. keep us in the loop so we can all learn.
Between the air filter and throttle body...closest to the air filter box...it has a plug in wire and is round. It actually sits in line in the intake hose so it can measure the amount of air going in the engine...based on this it tells the injectors how much fuel to squirt.
It shouldnt be clogged unless the new fuel pump picked up something from the bottom of the tank. I'm sure a good tune-up wouldnt hurt. I remember reading somewhere a long time ago that any internal combustion engine requires
3. In time
It may not run well, but you have to have those 3 components to make it run. Good luck with your project...
-There are 10 kinds of people. Those who understand binary, and those who do not.
-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan
Probably time to pull the plugs and run a compression check if it hasn't been tuned in a while. A stuck intake valve will cause those symptoms too. It is probably OK but you have to start eliminating things that don't cost a bunch of parts money.
Dabull is absolutely right...fire, fuel, all in the right sequence.
I doubt you have 2 things wrong...i suspect you never corrected the orginal problem. Very hard to diagnose without the right tools etc. May be cheaper in the long run to have a good tech look at it and diagnose it.
My 1990 525 had similar symptoms and I changed the fuel filter and it went away, well not really. My car would only represent those symptoms when it was cold out below 32 degrees F. The last time it happened I unpluged the MAF and it started and ran fine. So I bought CRC Electrical cleaner and sprayed it in the box on the MAF and that cleaned it and ever since it runs soooo much better especialy at idle. Just start and and unplug th MAF it should idle good but it woun't drive well at all you can only use 1/4 throttle after that it will stumble. Good luck
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